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Reports in Year 2021

No.

Report

Summary

1

The Analysis of Check Intervals of NML Measurement Systems in 2020

According to ISO/IEC 17025:2017 7.7, the laboratory shall have a procedure for monitoring the validity of results. The resulting data shall be recorded in such a way that trends are detectable and, where practicable, statistical techniques shall be applied to review the results. Setting up a control chart is an effective way to meet the requirements given above. Therefore, NML measurement systems implement the measurement quality assurance in the form of control charts at planned check intervals. This analysis is mainly based on the summary results of 2020 NML measurement systems’ routine check data, to understand the distribution of the check intervals of NML measurement systems, and to provide relevant suggestions for laboratories by constructing a matrix with the calibration amount and the check interval.

2

Final Report of 2021 NML Internal Audit

According to section 8.8 of ISO/IEC 17025:2017 and 8.7 of ISO 17034:2016, the laboratory and the reference material producer shall periodically and in accordance with a predetermined schedule and procedure, conduct internal audits of its activities to verify that its operations continue to comply with the requirements of the management system and standards. Therefore, NML implements the internal audit every year to confirm that each department’s operation fits the requirements of NML, ISO/IEC 17025:2017 and ISO 17034:2016. The effectiveness and suitability of NML management system are also ensured in addition. The task items and relevant records of NML internal audit in 2021 are shown as this research report.

3

Measurement System Validation Procedure for Current Transformer

This document is an assessment report of the current transformer measurement system
(E12) at the National Measurement Laboratory. This system is used to offer the calibration of
current transformers, current shunts, and related current converters. This system applies the
differential principle by using a current comparator to measure the difference between the
standard transformer and the unit under test. This document introduces the uncertainty analysis
method and result for the calibration carried out by this system as well as the procedure for the
quality assurance of this system. The evaluation method of this system follows “ISO/IEC
Guide 98-3:2008, Uncertainty of measurement —Part 3: Guide to the expression of
uncertainty in measurement (GUM: 1995)”, which is issued by ISO. According to the
evaluation method, Type A and Type B uncertainties evaluation are included. This document
states the detail information about the source of system errors and the evaluation method.
According to the analysis result, The capability and (relative) expanded uncertainty of this
system was atated as follows.
A. Current transformers measurement scope:
Primary current (Ampere): 5 A to 5000 A
Secondary current (Ampere): 1 A , 5 A
Expanded uncertainty:
Ratio error: 0.0070 %
Phase displacement: 0.024 mrad
(Level of confidence of 95 % , coverage factor k = 2)
B. Current shunts and related current converters measurement scope: 5 A to 5000 A
Relative expanded uncertainty: 0.29 mV/V
(Level of confidence of 95 % , coverage factor k = 2.01)

4

Measurement System Validation Procedure for AC-DC Voltage Transfer

This measurement system (system number: E06) validation procedure of AC-DC voltage transfer describes the measurement theory of the Thermal Voltage Converter(TVC), low voltage standard, micropotentiometer(μpot) and AC voltage source/meter. It includes the uncertainty analysis and can be used as an operation reference for the calibration service of AC voltage.

The calibration range of AC-DC current transfer:
Current range: 1 mV – 1000 V, Frequency range: 20 Hz –1 MHz, Uncertainty ( 95 % confidence level, k=2): 4 mV/V – 500 mV/V

5

Instrument Calibration Technique for Current Transformer Measurement System

This document is an instrument calibration technique on the current transformer measurement system ( E12) at the National Measurement Laboratory. This system is used to offer the calibration of current transformers, current shunts, and related current converters.This information is to describe these instrument   to be calibration principles, methods and practical operating procedures
This system applies the differential principle by using a current comparator to measure the difference between the standard transformer and the unit under test. the capability and relative expanded uncertainty of this system was stated as follows with a coverage factor (k = 2) corresponding to a level of confidence of approximately 95 %.

A. Current transformers measurement scope:
Primary current (Ampere): 5 A to 5000 A
Secondary current (Ampere): 1 A , 5 A
Expanded uncertainty:
Ratio error: 0.0070 %
Phase displacement: 0.024 mrad

B. Current shunts and realted current converters measurement scope: 5 A to 5000 A
Relative expanded uncertainty: 0.29 mV/V

6

Instrument Calibration Technique for Low Magnetic Field(1 mT to 50 mT)   Calibration System

This document, belonging to the low magnetic field measurement system (B03), describes how to calibrate gaussmeters and standard reference magnetic using the Low Magnetic Field (1 mT to 50 mT) Calibration System. Recommendations for equipment and supplies needed to implement such a system are presented along with the description of the required calibration procedure. The calibration capability of this calibration system is as follow.
Measurement range: 1 mT to 50 mT
Expanded uncertainty: 0.0054 mT to 0.2 mT
Coverage factor: k=1.98
Level of confidence : 95 %

7

Instrument Calibration Technique for AC-DC Voltage Transfer

This AC-DC Voltage Transfer calibration procedure describes the ac-dc difference determination of the Thermal Voltage Converter, TVC. It contains the steps of calibration procedure, preparations before calibration, required measurement equipment and standards, and a sample of the calibration (test) report. Thus, this calibration procedure can be used as an operation reference for the measurement of a Thermal Voltage Converter. Besides, the calibration procedures for the application of TVC to calibrate AC voltage source or AC voltage meter also describe in the appendix.

8

Instrument Calibration Technique for Low Current System

This document describes the method to calibrate a current source or a current meter by the low current measurement system (system code EO8) at National Measurement Laboratory. This system provides calibration service of direct low current standards from 10 pA to 1 uA. The calibration theory, measurement method, and calibration procedure for this system are described in detail in this document. The measurement method is passing a low current to a standard resistor and using a direct voltage meter to measure the voltage difference of standard resistor. The value of the current is then calculated by the Ohm’s low The measurement range of this system includes 10 pA, 100 pA, 1 nA, 10 nA, 100 nA, and 1 uA. The measurement uncertainties of this system are listed as below:

Range 10 pA 100 pA 1 nA 10 nA 100 nA 1 μA
Relative expanded
uncertainty (mA/A) 0.9 0.47 0.17 0.07 0.07 0.07
Coverage factor 2 2 2 2 2 2

9

Instrument Calibration Technique for Standard Capacitance Mesurement System-100 kHz、1MHz Capacitance Standard

This document is the operation procedure of capacitance measurement system for four-terminal-pair standard capacitors 1pF, 10 pF, 100 pF and 1000 pF at 100kHz to 1MHz frequencies. The capacitances of standard capacitors 1pF, 10 pF, 100 pF and 1000 pF at 1kHz to 1MHz frequencies were derived through their frequency characteristic and capactiances at 1kHz. This document described the method and procedures for characterizing frequency depedence of capacitance of four-terminal-pair standard capacitors and that for calculating the calibration results at 1kHz to 1MHz frequencies.

10

Measurement System Validation Procedure for Standard Capacitance-100 kHz~1 MHz Capacitance Standard

This document is an evaluation report on capacitance measurement system for 1 pF, 10 pF, 100 pF and 1000 pF at 100 kHz to 1 MHz frequencies.
The capacitance standard at frequency other than 100 kHz is derived from frequency dependence of four-terminal-pair standard capacitor. The frequency dependence is calculated based on equivalent circuit of standard capacitor using the data measured by the network analyzer. It is traceable to 100 kHz capacitance standard.
The device under calibration is compared to the four-terminal-pair standard capacitor to obtain its calibration results.
When the device under calibration is capacitor and LCR meter, the available measurement range and uncertainty are:

11

Instrument Calibration Technique for Microphone Sound Pressure Sensitivity -Comparison Method

The system provides calibrating sound pressure sensitivity for one-inch, half-inch and quarter-inch condenser microphone. The suitable calibration ranges are compliant to IEC 61094-1 LS1, IEC 61094-4 WS1 of one-inch condenser microphone (Frequency: 251 Hz), IEC 61094-1 LS2, IEC 61094-4 of half-inch condenser microphone (Frequency range: 20 Hz to 20 kHz) and IEC 61094-4 of quarter-inch condenser microphone (Frequency range: 20 Hz to 20 kHz) .

12

Research on battery metering of electric locomotive

When electric locomotives use the Ah (Ampere ‧ hour) model for metering, the Ah (Ampere ‧ hour) measurement and standard are important topics. Therefore, the measurement method and standard of Ah (Ampere ‧ hours) are researched and evaluated as the regulation of the national standards for electric locomotives metering.

13

Proposals for Revision of the Technical Specifications for Type Approval of Electrical Meter

This technical report focuses on the type approval of electrical meters. It has developed a draft technical specification for type approval after discussion by the industry, government and academia, and provides the basis for the Bureau of Standards to formulate national electrical meter type approval technical specifications in the future to ensure consistency and accuracy of measurement.

14

Acceptance Report of Microwave S-parameter Measurement System (System Code: U02) 

Replacing the U02 System of National Measurement Laboratory (NML) to Maintain the Calibration Capability

15

Instrument Calibration Technique for Shock Accelerometer— Comparison Method

This system is done for the Shock Vibration Comparison Calibration System (system code: V03). This report is done for calibrating accelerometer voltage sensitivity using back-to-back comparison method with high-g amplitude input of the shock vibration calibration system. The calibration methods and steps, the data analysis and some special precautions are described. The calibration methods include both manual operation and automation to release the steel ball. This document also could be the reference and training guide for the person to carry out calibration work. The validation results show that the calibration system applies for conducting the calibration of accelerometer sensitivity with acceleration range from 200 m/s2 to 10000 m/s2. The coverage factor at a level of confidence approximately 95 % is about 1.97. The relative expanded uncertainties for the system are 1.9 %.

16

Measurement System Validation Procedure for Accelerometer Calibration System - Comparison Method

This calibration system is categorized as the Vibration Calibration System and is coded as V02. The evaluation of measurement uncertainty in this document comprises Type A and Type B evaluations of uncertainty for the accelerometer calibration of charge and voltage sensitivity. The effective degrees of freedom in the system at a confidence level of approximately 95 % are calculated with related coverage factor. The system applies for conducting the calibration of accelerometer sensitivity with frequency range from 50 Hz to 7 kHz under acceleration input, 100 m/s2. The relative expanded uncertainty for the charge sensitivities of the accelerometer are less than 1.4 % with frequency at 100 Hz and 160 Hz. The relative expanded uncertainty for the voltage sensitivities of the accelerometer are less than 1.4 % below 3000 Hz and, and 3.4 % above 3000 Hz.

17

Instrument Calibration Technique for Vibration Meter-Comparison Method

This document describes the comparison method for calibrating the vibration meter in the Vibration Comparison Calibration System (system code: V02). From the voltage sensitivity of the standard accelerometer set and its voltage output under a certain frequency, it could be calculated and converted to the vibration displacement, velocity or acceleration.
This procedure includes: preparation, calibration procedure, post-calibration, data analysis and calibration report. Currently, automation program takes data acquisition and result calculation to the calibration processes. The expanded uncertainty with a coverage factor, approximately 2, under the level of confidence of 95 % for this system is:
1. the relative expanded uncertainty, 1.3 % for acceleration below 2000 Hz (including); the relative expanded uncertainty, 2.6 % from 2000 Hz to 5000 Hz;
2. the relative expanded uncertainty, 1.5 % for velocity from 50 Hz to 2000 Hz;
3. the relative expanded uncertainty, 2.1 % for displacement from 50 Hz to 200 Hz.

18

Instrument Calibration Technique for Sound Calibrator -Comparison Method

This document is the operating instruction for sound calibrator using comparison method (System code A03). The preliminary operations, calibration steps, data analysis and examples of calibration report are also included.

19

Measurement System Validation Procedure for Shock Accelerometer Calibration System — Comparison Method

This document describes herein details of the system validation for calibrating accelerometer voltage sensitivity on the shock vibration comparison calibration system using back-to-back comparison method at the Dynamic Engineering Measurement Laboratory/ National Measurement Laboratory. This calibration system is categorized as the Shock Vibration Comparison System for calibrating accelerometer sensitivity, and is coded as V03. This document comprises overview of the measurement system, measurement principle, estimation and calculation of the uncertainty, and measurement assurance program. The validation results show that the calibration system applies for conducting the calibration of accelerometer sensitivity with acceleration range from 200 m/s2 to 10000 m/s2 and the pulse time range from 0.6 ms to 3 ms. The coverage factor at a level of confidence of approximately 95 % is about 1.97. The relative expanded uncertainties for the system are 1.9 %.

20

Measurement System Validation Procedure for Sound Calibrator Calibration System-Comparison Method

This document of Measurement System Validation Procedure (MSVP) describes the estimation of measurement uncertainty of sound calibrator calibration system-comparison method (System code A03). It includes system introduction, calibration principle, uncertainty estimation and measurement verification, and serve as a reference guide for the operator and person in charge of the system.

21

Instrument Calibration Technique for Accelerometer—Comparison Method

This report offers the comparison method for calibrating the accelerometers in the Vibration Comparison Calibration System (system code: V02). The standard accelerometer and the unit under calibration are mounted on the same shaker. And, from the voltage ratio of these two sensors, the unknown sensitivity can be calculated by multiplying with the traceable reference sensitivity. Currently, automation program takes data acquisition and result calculation to the calibration processes. The expanded uncertainty for charge sensitivity is less than 1.4 % at 100 Hz and 160 Hz; for voltage sensitivity with 1.4 % below 3000 Hz, and 3.4 % above 3000 Hz, with a coverage factor, approximately 2, under the level of confidence of 95 % and the input acceleration is 100 m/s2.

22

Instrument Calibration Technique for Accelerometer -Fringe-Counting Method

Absolute calibration means that calibration parameters can be traceable to base units directly. Base units are length, time,…, etc. Since the wavelength of He-Ne laser is used in this vibration laser interferometry calibration system (system code: V01), also called accelerometer primary calibration, the traceability to base units is introduced to the accelerometer’s sensitivity directly. From Fringe-Counting Method, adopted by this primary calibration system, calculate the accelerometer’s sensitivity via measurements of displacement under excitation by a shaker. Then through comparing the electrical output of the accelerometer under test with the pre-determined acceleration, accelerometer’s sensitivity is obtained.
This procedure includes: preparation, calibration procedure, post-calibration, data analysis and calibration report. Currently, automation program takes data acquisition and result calculation to the calibration processes. The maximum relative expanded uncertainty is 0.49 % for charge sensitivity and 0.44 % for voltage sensitivity, with a coverage factor, approximately 2 at the level of confidence of 95 %. The measurement range is from 50 Hz to 700 Hz.

23

Instrument Calibration Technique for Microphone Sound Pressure Sensitivity-Reciprocity Method

This document of instrument calibration technique (ICT) mainly functions as an operational guide for microphone sound pressure sensitivity calibration system reciprocity method (System code A01). It comprises preliminary operation, calibration steps, the post-calibration and shutdown procedure, data analysis, and providing examples of calibration report during calibration.
The system provides calibrating sound pressure sensitivity for one-inch condenser microphone. The suitable calibration ranges are compliant to IEC 61094-1 LS1P of one-inch condenser microphone (Frequency range: 20 Hz to 12.5 kHz).

24

Instrument Calibration Technique for Sound Calibrator -Insert-Voltage Technique

This document is the operating instruction for sound calibrator using insert-voltage technique (System code A03). The preliminary operations, calibration steps, data analysis and example of calibration report are also included.

25

Measurement System Validation Procedure for Microphone Sound Pressure Sensitivity Calibration System-Reciprocity Method

This document of measurement system validation procedure (MSVP) describes the estimation of measurement uncertainty for calibration system of laboratory standard microphones by reciprocity technique (System code A01). It includes system introduction, calibration principle, uncertainty estimation and measurement verification, and serve as a reference guide for the operator and system team leader.
The system provides calibrating sound pressure sensitivity for 1-inch (23.77 mm) condenser microphone. The suitable calibration ranges are compliant to IEC 61094-1 LS1P of 1-inch condenser microphone (Frequency range: 20 Hz to 12.5 kHz).

26

Measurement System Validation Procedure for Accelerometer Calibration System-Fringe-Counting Method

Fringe-Counting Method, one of the interferometry, is adopted to do the accelerometer primary calibration in this vibration laser interferometry calibration system (system code: V01). The uncertainty estimation method through Type A and Type B uncertainties is introduced to this evaluation report for calculating the measurement uncertainty of accelerometers’ voltage sensitivity and charge sensitivity and their effective degrees of freedom with a chosen coverage factor. The maximum relative expanded uncertainty is 0.49 % for charge sensitivity and 0.44 % for voltage sensitivity, with a coverage factor, approximately 2 at the level of confidence of 95 %. The measurement range is from 50 Hz to 700 Hz.

27

Instrument Calibration Technique for Low-Frequency Vibration Meter-Comparison Method

This report offers the comparison method for calibrating the low-frequency vibration meter in This report offers the comparison method for calibrating the low-frequency vibration meter in the Low-Frequency Vibration Calibration System (system code: V04). From the voltage sensitivity of the standard accelerometer set and its voltage output under a certain frequency, it could be calculated and converted to the vibration displacement, velocity or acceleration.
This procedure includes: preparation, calibration procedure, post-calibration, data analysis and calibration report. Currently, automation program takes data acquisition and result calculation to the calibration processes. The expanded uncertainty with a coverage factor, approximately 2, under the level of confidence of 95 % for this system is:
1. the relative expanded uncertainty, 1.3 % for acceleration;
2. the relative expanded uncertainty, 1.5 % for velocity;
3. the relative expanded uncertainty, 2.3 % for displacement.
The measurement range is from 3.15 Hz to 50 Hz.

28

Instrument Calibration Technique for Low Frequency Accelerometer –Comparison Method

This document of Instrument Calibration Technique describes details of calibrating accelerometer sensitivity on a low frequency vibration calibration system using comparison method. The techniques are applied to conduct vibration measurement with frequency range from 0.5 Hz to 160 Hz. Taking the working standard accelerometer set as calibration standard, one compares output voltage of the calibrated accelerometer, as read from a precision digital voltmeter, with output voltage of the working standard accelerometer set associated with a second voltmeter, to carry out the calibration. This calibration system is categorized as the Low Frequency Vibration System for calibrating accelerometer sensitivity, and is coded as V04. This document is in accordance with the standard of ISO/IEC Guide 98-3:2008 and Taiwan Accreditation Foundation.
Frequency range: 0.5 Hz ~ 160 Hz.

29

Measurement System Validation Procedure for Low Frequency Accelerometer Calibration System – Comparison Method

This Validation report is done for the Low Frequency Vibration Calibration System (system code: V04). The uncertainty estimation method through Type A and Type B uncertainties is introduced to calculate the measurement uncertainty of accelerometers’ voltage sensitivity effective degrees of freedom with a chosen coverage factor. Consequently, uncertainty in measurement for this system is, the relative expanded uncertainty < 1.5 % with a coverage factor, approximately 2 under 95 % confidence level. The measurement range is from 0.5 Hz to 160 Hz.

30

Instrument Calibration Technique for Low Frequency Accelerometer–Sine Approximation Method

This document of Instrument Calibration Technique describes details of low frequency calibration system of the Dynamical Engineering Measurement Laboratory of the National Measurement Laboratory follows ISO16063-11:1999 to take the data by laser interferometer sine spproximation method to calibrate the sensitivity of the accelerometer. This calibration system belongs to the low frequency vibration calibration system. The identification no. is V04.
The idiom、words、symbol、and process of assessment of measurement uncertainty conforms to ISO/IEC Guide 98-3:2008 and TAF. The measurement frequency range is from 0.1 Hz to 160 Hz and system capability is shown as below. The result of accelerometer voltage sensitivity is expressed in term of V/(m/s^2) with a level of confidence 95 %.

31

Measurement System Validation Procedure for Low Frequency Accelerometer Calibration System– Sine Approximation Method

This Measurement System Validation Procedure (MSVP) describes the estimation of the measurement uncertainty referred to ISO 16063-11:1999 for low frequency vibration calibration system based on the Sine Approximation Method (system code: V04). The result of the accelerometer voltage sensitivity is expressed in terms of V/( m/s^2).
The idiom, words, symbol, and process of assessment of measurement uncertainty conform to ISO/IEC Guide 98-3:2008 and TAF. The frequency is in the range of 0.1 Hz to 160 Hz. The relative expanded uncertainty of this system is from 1.3 % to 1.7 % with a coverage factor about 2, under 95 % level of confidence.

32

Instrument Calibration Technique for Accelerometer -Sine-Approximation Method

Absolute calibration means calibration parameters can be traceable to base units directly. Base units are length, time,…, etc. Since the wavelength of He-Ne laser is used in this vibration laser interferometry calibration system (system code: V01), also called accelerometer primary calibration, the traceability to base units is introduced to the accelerometer’s sensitivity directly. From Sine-Approximation Method, adopted by this primary calibration system, calculate the accelerometer’s sensitivity via measurements of displacement under excitation by a shaker. Then through comparing the electrical output of the accelerometer under test with the pre-determined acceleration, accelerometer’s sensitivity is obtained.
This procedure includes: preparation, calibration procedure, post-calibration, data analysis and calibration report. Currently, automation program takes data acquisition and result calculation to the calibration processes. The relative expanded uncertainties of this vibration laser interferometry calibration system are, 0.76 % under 5000 Hz, 1.78 % up to 10000 Hz for the voltage sensitivity; and 0.79 % under 5000 Hz, 1.79 % up to 10000 Hz for the charge sensitivity, with a coverage factor, approximately 2 under the level of confidence of 95 %. The measurement range is from 50 Hz to 10000 Hz.

33

Measurement System Validation Procedure for Accelerometer Calibration System-Sine-Approximation Method

Sine-Approximation Method, one of the interferometry, is adopted to do the accelerometer primary calibration in this vibration laser interferometry calibration system (system code: V01). The uncertainty estimation method through Type A and Type B uncertainties is introduced to this evaluation report for calculating the measurement uncertainty of accelerometers’ voltage and charge sensitivity and their effective degrees of freedom with a chosen coverage factor. Consequently, The relative expanded uncertainties of this vibration laser interferometry calibration system are, 0.76 % under 5000 Hz, 1.78 % up to 10000 Hz for the voltage sensitivity; and 0.79 % under 5000 Hz, 1.79 % up to 10000 Hz for the charge sensitivity, with a coverage factor, approximately 2 under the level of confidence of 95 %. The measurement range is from 50 Hz to 10000 Hz.

34

Measurement System Validation Procedure for Sound Calibrator Calibration System-Insert-voltage Technique

This document of measurement system validation procedure(MSVP) describes the estimation of measurement uncertainty of sound calibrator calibration system—insert voltage technique (System code A03). It includes system introduction, calibration principle, uncertainty estimation and measurement verification, and serve as a reference guide for the operator and person in charge of the system.

35

Measurement System Malidation Procedure for Vibration Meter Calibration System-Comparison Method

This validation report is done for calibrating vibration meters of the Vibration Comparison Calibration System (system code: V02). The estimation method through Type A and Type B uncertainties is introduced to calculate the measurement uncertainty of the acceleration, velocity or displacement, read from a vibration meter and effective degrees of freedom with a chosen coverage factor. Consequently, the expanded uncertainty with a coverage factor, approximately 2, under the level of confidence of 95 % for this system is:
1. the relative expanded uncertainty, 1.3 % for acceleration under 2000 Hz (including) and 2.6 % from 2000 Hz to 5000 Hz;
2. the relative expanded uncertainty, 1.5 % for velocity from 50 Hz to 2000 Hz;
3. the relative expanded uncertainty, 2.1 % for displacement from 50 Hz to 200 Hz.

36

Measurement System Validation Procedure for Low-Frequency Vibration Meter Calibration System-Comparison Method

This validation report is done for calibrating vibration meters of the Low-Frequency Vibration Calibration System (system code: V04). The estimation method through Type A and Type B uncertainties is introduced to calculate the measurement uncertainty of the acceleration, velocity or displacement, read from a vibration meter and effective degrees of freedom with a chosen coverage factor. Consequently, the expanded uncertainty with a coverage factor, approximately 2, under the level of confidence of 95 % for this system is:
1. the relative expanded uncertainty, 1.3 % for acceleration;
2. the relative expanded uncertainty, 1.5 % for velocity;
3. the relative expanded uncertainty, 2.3 % for displacement.
The measurement range is from 3.15 Hz to 50 Hz.

37

Instrument Calibration Technique for Charge Amplifier

This system is attached to the Vibration Laser Calibration System and system code is V01. This document describes the calibration procedures for charge amplifier sensitivity which the electric charge signal is generated by a standard capacitor and sent to the calibrated charge amplifier. Therefore, the charge amplifier sensitivity can be calculated from the input electric charge and the output voltage value.
Through the validation for the calibration system of the charge amplifier sensitivity, the relative expanded uncertainty is 1.2 % for the frequency below 10 Hz, and 0.10 % for the frequency over 10 Hz, with a coverage factor of approximately 2 at the level of confidence of 95 %. The measurement frequency range is from 10 Hz to 10 kHz.

38

Measurement System Validation Procedure for Charge Amplifier Calibration System

This system is attached to the Vibration Laser Calibration System and system code is V01. The uncertainty estimation method through Type A and Type B uncertainties is introduced to this evaluation report for calculating the measurement uncertainty of the charge amplifier sensitivity and its effective degrees of freedom with a chosen coverage factor. Through the validation for the calibration system of the charge amplifier sensitivity, the relative expanded uncertainty is 1.2 % for the frequency below 10 Hz, and 0.10 % for the frequency over 10 Hz, with a coverage factor of approximately 2 at the level of confidence of 95 %. The measurement frequency range is from 10 Hz to 10 kHz.

39

Measurement System Validation procedure for Sound Pressure Level of Sound Level Meter Calibration System

This document of Measurement System Validation Procedure (MSVP) describes the estimation of measurement uncertainty of the sound pressure level of sound level meter calibration system (System code A03). It includes system introduction, calibration principle, uncertainty estimation and measurement verification, and serve as a reference guide for the operator and person in charge of the system.
The system can calibrate the sound pressure level of sound level meter. The suitable range and the expanded uncertainty with a coverage factor k = 2, corresponding to a level of confidence of approximately 95 % is from 0.2 dB to 0.6 dB with frequency range from 31.5 Hz to 16 kHz.

40

Instrument Calibration Technique for Sound Pressure Level of Sound Level Meter

This document of Instrument Calibration Technique(ICT) describes calibration procedure of sound level meter (System code A03) and serves as a reference guide for the operator. It includes the preliminary operations, calibration steps, data analysis and example of calibration report.
The system provides calibrating the sound pressure level of sound level meter. The suitable range and the expanded uncertainty with a coverage factor k = 2, corresponding to a level of confidence approximately 95 % are 0.2 dB to 0.6 dB with frequency at 31.5 Hz to 16 kHz.

41

Measurement System Validation Procedure for Shock Accelerometer Calibration System — Phase Operation Method

This calibration system is categorized as the Primary Shock Vibration Calibration System V06. The evaluation of measurement uncertainty in this document comprises Type A and Type B evaluations of uncertainty for the accelerometer calibration of voltage sensitivity. This document comprises overview of the measurement system, measurement principle, estimation and calculation of the uncertainty, and measurement assurance program.
The validation results show that the calibration system applies for conducting the calibration of accelerometer sensitivity with acceleration range from 200 m/s2 to 10 000 m/s2 and pulse time range from 0.3 ms to 3 ms. The coverage factor at a level of confidence 95 % is about 1.96. The relative expanded uncertainties for the system are 0.8 %.

42

Instrument Calibration Technique for Shock Accelerometer--Phase Operation Method

This calibration system is categorized as the Primary Calibration System for Shock Level. This report is done for calibrating accelerometer voltage sensitivity using dual channel phase method with different low shock level input of the calibration system. The calibration methods and steps, the data analysis and some special precautions are described in this report. This document also could be the reference and training guide for the person to carry out calibration work.
The validation results show that the calibration system applies for conducting the calibration of accelerometer sensitivity with acceleration range from 200 m/s2 to 10 000 m/s2 and pulse time range from 0.3 ms to 3 ms. The coverage factor at a level of confidence 95 % is about 1.96. The relative expanded uncertainties for the system are 0.8 %.

43

Instrument Calibration Technique for Microphone Free-Field Sensitivity Calibration System-Reciprocity Method

This document of instrument calibration technique (ICT) is the operational guide for microphone free-field sensitivity calibration system (System code A04) by reciprocity method. It comprises preliminary operation, calibration steps, post calibration and shutdown procedure, data analysis, and examples of calibration report.

44

Measurement System Validation Procedure for Microphone Free-Field Sensitivity Calibration System - Reciprocity Method

This document of measurement system validation procedure (MSVP) describes the estimation of measurement uncertainty for microphone free-field sensitivity calibration system - reciprocity method (System code A04). It includes system introduction, calibration principle, uncertainty estimation and measurement verification, and serve as a reference guide for the operator and person in charge of the system.

45

Measurement System Validation Procedure for Microphone Pressure Sensitivity Calibration System-Comparison Method

This document of measurement system validation procedure(MSVP) describes the estimation of measurement uncertainty for microphone calibration system-microphone pressure sensitivity comparison method (System code A02). It includes system introduction, calibration principle, uncertainty estimation and measurement verification, and serves as a reference guide for the operator and system team leader.

46

Measurement System Validation Procedures for the High Temperature Eutectic Fixed-Point Measurement for Noble Metal Thermocouple Thermometers and Pure Metal Thermocouple Thermometers

The measurement system validation procedures, of National Measurement Laboratory, for the high temperature eutectic fixed-point calibration of noble metal thermocouple thermometers and pure metal thermocouple thermometers are elucidated in this technical report. The measurement range of this calibration system, labeled as T03. The temperature scale is defined according to the supplementary guides for International Temperature Scale of 1990 (ITS-90). The calibration of thermocouple thermometers are carried out at the eutectic fixed-points of Cobalt-Carbon alloy (Co-C;~1324 °C) Palladium-Carbon alloy (Pd-C;~1492 °C). The temperature measurement range is between 1100 °C and 1500 °C.

47

Measurement System Validation Procedures for the Eitectic Fixed-Point Calibration System of the Radiation Thermometers

The measurement system validation procedures for eutectic points calibrtion system of radiation thermometers are described in this technical report.   This calibration system of National Measurement Laboratory is labeled as T01. The contents of this report include the introduction of the calibration system, the measurement principles and methods, and the evaluation of the measurement uncertainty. The measurement uncertainty of this system was evaluated according to statistical analysis theory of ISO/IEC GUIDE 98-3:2008
The calibration capabilities of this measurement system are evaluated as:the expanded uncertainty of the temperature from 1085 ℃ to 3000 ℃ is
0.14 ℃to 3.6 ℃ with a coverage factor k = 2.00 at a confidence level of 95 %.

48

Measurement System Validation Procedures for the Thermodynamic Temperature Measurement of Platinum Resistance Thermometers

The uncertainty evaluation of the thermodynamic temperature measurement system for platinum resistance thermometers, labeled T05, is being elucidated in this technical report. This measurement system is a primary acoustic gas thermometry system that utilizes the method of measuring acoustic gas speed to determine the thermodynamic temperature, and is also called PAT-Q system for short. It is composed mainly of four sub-systems, including air pressure control system, temperature system, microwave system, and acoustic system.
The descriptions of this measurement system as well as the related measurement principles were introduced in this report. According to the statistical theorem specified in ISO-GUM, the uncertainty of this measurement system was evaluated by steps composing of modeling the measurement, analyzing the uncertainty sources, evaluating the covariance associated with any input estimates, determining the combined standard uncertainty, and determining the expanded uncertainty on the basis of effective degrees of freedom and the level of confidence. The calibration capability of this system, obtained by the evaluation, is stated as follows :
(1) Temperature range: 213.15 K to 373.15 K
(2) Expanded uncertainty with a confidence level of approximately 95 % is 0.40 mK (coverage factor k=2.00)

49

Measurement System Validation Procedure for Illuminance Meter of Absolute Radiometer System

This document states the uncertainty evaluation for Illuminance Meter and luminous intensity lamp of Absolute Radiometer System. The calibration items are illuminance meter, chroma meter, and luminous intensity standard lamp. According to the calibration principle and calibration procedure, the capability for calibration of illuminance meter is as follows.
l Illuminance :
Measurement range (lx) Relative expanded uncertainty (%) Coverage factor
25 to 90000 1.4 2.00
l Luminous intensity :
Measurement range (cd) Relative expanded uncertainty (%) Coverage factor
25 至 90000 1.2 2
l Chromaticity coordinate :
   x y u v
Expanded uncertainty 0.0012 0.0007 0.0008 0.0003
Coverage factor 1.97 1.97 1.97 1.97
l Correlated color temperature :
Relative expanded uncertainty Coverage factor
29 K 1.97

The measurement uncertainty is evaluated according to ”ISO/IEC Guide 98-3:2008, Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)”.

50

Measurement System Validation Procedure for Spectral Responsivity Calibration of Absolute Cryogenic Radiometer System

This document describes the measurement system validation procedure for spectral responsivity calibration of optical detectors in the Absolute Cryogenic Radiometer System (O07). The contents include: introduction to the National Measurement Laboratory (NML) spectral responsivity scale (Chap. 2), procedures for uncertainty analysis (Chap. 3), quality assurance design (Chap. 4), and calibration capability (Chap. 5). Current measurement capability for different types of optical detectors is summarized as below. Please refer to Appendix 8.6 for more details.

Type of optical detector: Wavelength range/Relative expanded uncertainty (wavelength dependent)/Coverage factor (k) (wavelength dependent)
Si detector: 330 nm ~ 1100 nm/0.14 % ~ 3.4 %/1.96 ~ 2.45
Si-based trap detector: 330 nm ~ 1100 nm/0.15 % ~ 2.3 %/1.96 ~ 2.57
Ge detector: 800 nm ~ 1650 nm/0.44 % ~ 0.72 %/1.97 ~ 2.09
Confidence level: 95 %

51

Measurement System Validation Procedure for LED Spectroradiometric Spectrum

This is evaluation report for the light emitting diodes (LEDs) Spectroradiometric measurement system. The document contains the system description the measurement principle and measurement method. The spectral wavelength range of this system is from 380 nm to 780nm.

52

Measurement System Validation Procedure for Total Spectral Radiant Flux Standard Lamp

This document describes the uncertainty evaluation of the total spectral radiant flux standard lamp calibration by a specific measurement quality assurance and uncertainty analysis. According to the calibration procedures and principles of measurement, we analyze the data and estimate the capability of the system.

53

Measurement System Validation Procedure for Luminous Flux Standard Lamp of Luminous Flux System- 3 m Integrating Sphere

This document is the evaluation report for the standard lamps total luminous flux measurement system (O02). This document contains the system description, the measurement principle and measurement method by using the integrating sphere photometer. This report consists of the design of quality assurance, the analysis of error source, the system capability and uncertainty.
The measurement range of the standard lamps total luminous flux system is from 1 lm to 20000 lm. The relative expanded uncertainty is 1.0 % with a coverage factor
k = 1.98 corresponding to a level of confidence approximately 95 %.

54

Instrument Calibration Technique for Luminous Flux Standard Lamp of Luminous Flux System - 3 m Integrating Sphere

This document describes the calibration procedures for luminous flux calibration of lamps by using the 3 m integrating sphere photometer measurement system (system code: O02). The calibration range is from 1 lm to 20000 lm. It applies to incandescent lamps and halogen lamps. By substitute and self-absorption method, the total luminous flux of the sample lamp was compared to that of the calibrated standard lamp.

55

Measurement System Validation Procedure for Photometric Scale of the Cryogenic Radiometer System

This document describes the measurement system validation procedure for detector-based photometric scale, administratively corresponding to the Cryogenic Radiometer System (O07). The contents include: introduction to the National Measurement Laboratory (NML) luminous intensity scale (Chap. 2), procedures for uncertainty analysis (Chap. 3), quality assurance design (Chap. 4), and calibration capability (Chap. 5). Current measurement capability is listed below.

56

Instrument Calibration Technique for Photometric Scale of the Cryogenic Radiometer System

This document describes the procedure for realization of detector-based photometric scale and the calibration of luminous intensity lamps. The luminous intensity standard is traceable to the cyrogenic radiometer, administratively corresponding to the Cryogenic Radiometer System (O07).

57

Uncertainty evaluation of EUV spectral responsivity

This document describes the evaluation of the uncertainties for spectral responsivity calibration of EUV optical detectors. The contents include: introduction to the current system (Chap. 2), procedures for uncertainty analysis (Chap. 3), and calibration capability (Chap. 4). Current measurement capability for Si-based EUV optical detectors is listed below. UDT: Si photodiode; wavelength: 13.5 nm; relative expanded uncertainty: 4.6 %; coverage factor (k): 2.00; confidence level: 95 %.

58

Instrument Calibration Technique for Rockwell Hardness Block

The Instrument Calibration Technique describes the procedures used to calibrate Rockwell harness blocks by Rockwell hardness standard machine. This document explains the items should be prepared before calibration, the calibration steps and how to deal with the instruments and raw data after calibration.

59

Measurement System Validation Procedure for Rockwell Hardness Standard System

This measurement system is attached to the primary Rockwell Standard System (system code: NO6). The measurement range, Expanded Uncertainty, Coverage factor and Confidence level are shown as follows.
HRA ≧ 70,Expanded Uncertainty 0.30
HRB ≧ 50,Expanded Uncertainty 0.40
18 ≦ HRC ≦ 70,Expanded Uncertainty 0.30
Coverage factor:2
Confidence level:95%

60

Measurement System Validation Procedure for the kilogram weighing system-METTLER M_one vocuum mass comparator

Uncertainty evaluations were described in this document for the Mettler-Toledo M_ONE, which is the key instrument of the prototype balance system. The uncertain evaluation for the mass of the primary stainless standard weight is obtained from the mass of Pt-Ir prototype kilogram.
After evaluations, the calibration capability of this system is shown below:
Calibration range:1 kg
Expanded uncertainty:29 μg (coverage factor , corresponding to a level of confidence of approximately 95 %.)

This system belongs to prototype balance measurement system (M02).

61

Instrument Calibration Technique of Micro Vickers Hardness Standard Machine

This calibration procedure is used as a guide to operate the Micro Vickers hardness standard machine. This document explain the items should be prepared before calibrating, the calibrating steps and how to deal with the instruments and raw data after calibrating, besides it also explain some adjustment processes. The measurement range is form 100 HV to 900 HV.

62

Measurement System Validation Procedure for Micro Vickers Hardness Standard Machine

This document describes the uncertainty evaluation of the Vickers harness standard machine. The main purpose of this machine is to maintain and propagate the standards of Vickers harness in R.O.C. We adopt the method suggested in "ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement" to evaluate the uncertainty of this system. We also design a measurement assurance program using check standards and control charts to insure the system’s stabilization and reliability.
This document describes the uncertainty evaluation for the micro Vickers harness standard machine, which provides traceability and uncertainty for the uses of micro Vickers hardness standard. The method suggested in ISO/IEC Guide 98-3:2008 is used to evaluate the uncertainty of this system. A measurement assurance program is designed using check standards and control charts to insure the system’s stabilization and reliability.
The measurement ranges and the relative expanded uncertainty (a coverage factor k = 2, corresponding to a level of confidence of approximately 95 %) are shown as below:
Instrument : Akashi HM-124 Micro Vickers hardness standard machine
Calibration item : Micro Vickers hardness block
Measurement range : 100 HV ~ 900 HV
Test force and Relative expanded uncertainty :
489.46 mN 7.1 %
978.91 mN 5.8 %
1957.83 mN 5.4 %
2936.74 mN 5.2 %
4894.57 mN 5.1 %
9789.14 mN 5.0 %

63

Measurement System Validation Procedure for 500N Deadweight Force Standard Machine

This msvp is attached to the 500 N force standard machine. The main purpose of this machine is for maintaining 500 N reference standard, and transfer it to secondary standard .We adopt the mode suggested in ISO/IEC Guide 98-3:2008 evaluate the uncertainty of this system. We also design a measurement assurance program to insure the system’s stabilization and reliability. The measurement range and its uncertainty is shown as below: System Measurement range(N) Related expanded uncertainty (95% confidence level) Coverage factor NML 500 N S/N:54041501 1~500 2×10-5 2

64

Measurement System Validation Procedure for the Low-Capacity Mass Weighing System – Sartorius CCR10-1000 Robotic Mass Comparator

This document provides laboratory colleagues a reference for evaluating the uncertainty of weighting 100 g, 200 g, 500 g and 1 kg.
In practical weighing, the double substitution method is adopted to do mass comparison of 100 g, 200 g, 500 g and 1 kg weights. During weighing, the readings of the weighting can be obtained and the mean value and standard deviation can be calculated out by computer, the mass value and uncertainty of the unknown weight can be calculated out from the values of standard weight.
Measurement scope of the system: 100 g, 200 g, 500 g and 1 kg.
Coverage factor and expanded uncertainty with a 95% confidence level are shown as below.
Measurement scope Coverage factor Expanded uncertainty (mg)
1 kg       1.96 0.050
500 g 1.97 0.023
200 g 1.97 0.011
100 g 1.97 0.010
The system belongs to the low-capacity mass measurement system (M01).

65

Measurement System Validation Procedure for the Low-Capacity Mass Weighing System – METTLER a10XL Robotic Mass Comparator

This document provides the uncertainty evaluations of weighting 1 mg, 2 mg, 5 mg, 10 mg, 20 mg, 50 mg, 100 mg, 200 mg, 500 mg, 1 g, 2 g, 5 g and 10 g for the Mettler a10XL robotic mass comparator.
In practical weighing, the double substitution method is adopted to do mass comparison of 1 mg, 2 mg, 5 mg, 10 mg, 20 mg, 50 mg, 100 mg, 200 mg, 500 mg, 1 g, 2 g, 5 g and 10 g weights. During weighing, the readings of the weighting can be obtained and the mean value and standard deviation can be calculated out by computer, the mass value and uncertainty of the unknown weight can be calculated out from the values of standard weight.
Measurement scope of the system: 1 mg, 2 mg, 5 mg, 10 mg, 20 mg, 50 mg, 100 mg, 200 mg, 500 mg, 1 g, 2 g, 5 g and 10 g.

66

Measurement System Validation Procedure for the Low-Capacity Mass Weighing System – METTLER a107XL Robotic Automatic mass comparator

This procedure provides a reference for evaluating the uncertainty when performing mass calibrations of weights of 10 g, 20 g, 50 g and 100 g.
In practical weighing, double substitution method is used to do the mass comparison of 10 g, 20 g, 50 g and 100 g. During weighing, the reading of the weight at each position can be obtained. After performing several measurements, the mean value and standard deviation can be calculated by computer, and the mass value and uncertainty of the unknown weight can be calculated out from the values of standard weight.
Measurement scope of the system: 10 g、20 g、50 g and 100 g

67

Instrument Calibration Technique for Force Transducer by Small Force Calibration System

The contents of this calibration procedure for the 10 N small force calibration system include procedures of preparations, calibration procedure, post-calibration, data analysis and calibration report. The force transducer in the range from 1 mN to 10 N can be calibrated by the system.
This instruction can also serve as a reference for practical training of new staffs who are designated to perform calibrations using the 10 N universal calibration system.

68

Measurement System Validation Procedure for Small Force Calibraton System

This document describes the uncertainty evaluation for force transducer calibration at the range of 10 mN to 10 N (1 gf to 1000 gf) by the 10 N small force calibration system. The uncertainty was evaluated according to ISO/IEC Guide 98-3:2008. A measurement assurance program is designed using check standards and control charts to insure the system’s stabilization and reliability. This system is belong to 200 mN Force Universal Calibration System (System code: N11).

69

Image Recognition Operation Manual of 500 kN Universal Calibration System

The force calibration system still relies on manual copying for the data acquisition. In additional such as time-consuming and labor-consuming, manual copying has a high error rate, which has a certain degree of impact on the correction business and service quality. Through the application of machine vision module and identification software technology, directly read the display image during the calibration.
This operation manual provides a reference for colleagues in this laboratory to use the image recognized system in the calibrate procedure.

70

Force Comparison Calibration Machine Acceptance Report

Replacement of N03 System Equipment in NML to Ensure the Quality of Calibration Services

71

Measurement System Validation Procedure for Dynamic Expansion Method Vacuum Gauge Calibration System

The Measurement System Validation Procedure describes the method used to evaluate the uncertainty of vacuum gage calibration system(system code: L02) at CMS/ITRL The evaluation method is based on the official publication of the ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995). The influences of error sources are analyzed while performing the calibration works. The measurement scope and the results of evaluated uncertainty are listed in detail.

72

Instrument Calibration Technique for Rockwell hardness blocks

The Instrument Calibration Technique describes the procedures used to calibrate Rockwell harness blocks by Rockwell hardness standard machine of the national measurement laboratory. This document explains the items should be prepared before calibration, the calibration steps and how to deal with the instruments and raw data after calibration, the reference standard is ISO 6508-3:2015 .

73

Instrument Calibration Technique for Roundness Standard

The document describes the calibration procedure of the roundness measuring system for the National Measurement Laboratory. In this document, a FEDERAL FORMSCAN 3000 rotary table type roundness measuring instrument is used. Profile of the customer artifact that rotate along a spindle is measured by an electro-mechanical probe. Out-of roundness can be obtained by the least square circle method to separate the spindle error.
This calibration system is attached to the Roundness Calibration System (System code: D12), Measuring range:
Roundness standard : (0~2)μm (out-of-roundness)
For 95﹪confidence level, coverage factor k =2.01, Expanded uncertainty(U) =0.020 μm.

74

Measurement System Validation Procedure for Roundness Measurement System

This document is the evaluation report of roundness measuring system of National Measurement Laboratory. The roundness measuring instrument is FEDERAL FORMSCAN 3000 type which consists of a high precision turntable and a mechanical electronic gage probe to grab the radial deviation of workpiece. The least squares analysis and separating spindle error methods have been used to calculate the roundness of the workpiece and the spindle error (the roundness of spindle).
In the Quality Assurance Model of the instrument the spindle error (the roundness of spindle) is process parameters to check the stability of calibration procedure. After long-term stacking the data of process parameter, we have evaluated the capacity of roundness calibration and the measuring uncertainty as follows:
Measuring range:
Roundness standard:(0~2 ) μm (out-of-roundness)
For 95 % confidence level, coverage factor k = 2.01
Expanded uncertainty = 0.020 μm
This document belongs to roundness calibration system (D12).

75

Instrument Calibration Technique for Angle Blocks

This document describes the calibration procedures for angle blocks with nominal angles from 1" ~ 45° at National measurement Laboratory. The angle blocks to be calibrated are compared with the reference angle blocks by using two autocollimators. The required equipment for this calibration is also stated. An example of calibration report is given. This calibration system is attached to the Angle Blocks Calibration System (System code: D06).

76

Instrument Calibration Technique for Dial indicator calibrator by Laser Interferometer

his document describes the calibration procedures for dial indicator calibrator. The dial indicator calibrator is directly calibrated by laser interferometer.

77

Measurement System Validation Procedure for Dial Indicator Calibrator by Laser Interferometer

This document states the uncertainty evaluation procedures for the calibration system of dial indicator calibrator. The dial indicator calibrator is directly calibrated by the homemade laser interferometer. This calibration system is attached to the Laser Interferometer Calibration System (System code: D18)

78

Measurement System Validation Procedures for Angular Encoder

This document states the uncertainty evaluation procedures for the angular encoders calibration system at National Measurement Laboratory. The calibration method bases on comparison method. The angle standard is self-calibiratable angle measurement equipment which includes a rotary table, a tracable angular encoder and twelve optical readheads. By using self angle calibration, every angle of the angle standard can be calculated. Comparing the angle between the angle standard and the angular encoder, the deviation angle of angular encoder can be calculated. The effects of the influential factors on this calibration system will be considered to estimate the uncertainty according to the ISO/IEC Guide 98-3:2008. The confidence level of this system is 95 %. This calibration system is attached to the Angle Blocks Calibration System (System code: D06).

79

Instrument Calibration Technique For Angular Encoder

This document describes the calibration procedures for angular encoders at National measurement Laboratory. The angular encoders to be calibrated are compared with the angle standard. The angle standard is self-calibiratable angle measurement equipment which includes a rotary table, a tracable angular encoder and twelve optical readheads. By using self angle calibration, every angle of the angle standard can be calculated. Comparing the angle between the angle standard and the angular encoder, the deviation angle of angular encoder can be calculated. This calibration system is attached to the Angle Blocks Calibration System (System code: D06).

80

Measurement System Validation Procedure of GPS Static and Kinematic Positioning Calibration System

This document is an assessment report on the calibration system of the GPS static and kinematic positioning by Center for Measurement Standards in carrying out the National Measurement Laboratory’s Project. The main purposes are to describe the error sources caused by proceeding the calibration of the GPS receivers in the GPS network and to analyze the uncertainties of the calibration system.
The uncertainties of the calibration system are according to the "Guide to the Expression of Uncertainty in Measurement" published by the International Standards Organization (ISO).

81

Measurement System Validation Procedure for Nanoparticle Size by Calibration-System by Electro-Gravitational Aerosol Balance

This document describes the uncertainty evaluation of nanoparticle characterized using the Electro-gravitational Aerosol Balance (EAB). The primary standard of particle size ranging from 100 nm to 500 nm in number mean diameter using the electro- gravitational aerosol balance was developed in Center for Measurement Standards of Industrial Technology Research Institute. The particles certified by the standard system are used as size standards to calibrate various types of nanoparticle size measurement instruments. This system is attached to the Nanoparticle Size Measurement System and its code is D26.
The uncertainty analysis of measurement results is based on ISO/IEC Guide 98-3:2008. The error sources from the measurement instruments and process are considered and evaluated. After a practical evaluation of uncertainty, the existing measuring system provides the following capability.
‧ Calibration item: Particle Size Standards (Polystyrene)
‧ Measuring range: 100 nm to 500 nm.
‧ Expanded uncertainty: 3.0 nm
‧ Confidence level: 95 %
‧ Coverage factor: 2.23

82

Instrument Calibration Technique for Nanoparticle Size by Electro-Gravitational Aerosol Balance

This document describes the calibration procedures for nanoparticle size characterized using the Electro-gravitational Aerosol Balance (EAB). The particles certified by the standard system are used as size standards to calibrate various types of nanoparticle size measurement instruments. The primary standard of particle size ranging from 100 nm to 500 nm in number mean diameter using the electro- gravitational aerosol balance was developed in Center for Measurement Standards of Industrial Technology Research Institute. The particles certified by the standard system are used as size standards to calibrate various types of nanoparticle size measurement instruments. This system is attached to the Nanoparticle Size Measurement System and its code is D26. The uncertainty analysis of measurement results is based on ISO/IEC Guide 98-3:2008. The error sources from the measurement instruments and process are considered and evaluated. After a practical evaluation of uncertainty, the existing measuring system provides the following capability. ‧ Calibration item: Particle Size Standards (Polystyrene) ‧ Measuring range: 100 nm to 500 nm. ‧ Expanded uncertainty: 3.0 nm ‧ Confidence level: 95 % ‧ Coverage factor: 2.23

83

Measurement System Validation Procedure for Nanoparticles Size Calibration System-Differential Mobility Analysis

This document describes the uncertainty evaluation of nanoparticles size calibration system characterized by differential mobility analysis (DMA), belonging to nanoparticle measuring system (D26). The measuring system is assembled by TSI commercial instruments and can currently provide the particle size calibration service from 20 nm to 500 nm.
The uncertainty analysis of measurement results is based on ISO/IEC Guide 98-3:2008 to the expression of uncertainty in measurement. The error sources from the measurement instruments and process are considered and evaluated. After a practical evaluation of uncertainty, the existing measuring system provides the following capability.
‧ Calibration item: Particle Size Standards (Polystyrene)
‧ Measuring range: 20 nm to 500 nm.
‧ Confidence level: 95 %
‧ Expanded uncertainty:
Measuring range Expanded uncertainty Coverage factor
20 nm ≦ D ≦ 250 nm 0.068D + 0.343 nm 2.16
250 nm < D < 350 nm 0.064D 1.97
350 nm ≦ D ≦ 500 nm 0.065D + 0.985 nm 1.96
where D is particle diameter in nm.

84

Instrument Calibration Technique for Nanoparticles Size-Differential Mobility Analysis

This document describes the calibration procedures for nanoparticle size characterized by differential mobility analysis (DMA), belonging to nanoparticle measuring system (D26). The measuring system is assembled by TSI commercial instruments and can currently provide the particle size calibration service from 20 nm to 500 nm.
The uncertainty analysis of measurement results is based on ISO/IEC Guide 98-3:2008 to the expression of uncertainty in measurement. The error sources from the measurement instruments and process are considered and evaluated. After a practical evaluation of uncertainty, the existing measuring system provides the following capability.
‧ Calibration item: Particle Size Standards (Polystyrene, PSL)
‧ Measuring range: 20 nm to 500 nm
‧ Confidence level: 95 %
‧ Expanded uncertainty:
Measuring range Expanded uncertainty Coverage factor
20 nm ≦ D ≦ 250 nm 0.068D + 0.343 nm 2.16
250 nm < D < 350 nm 0.064D 1.97
350 nm ≦ D ≦ 500 nm 0.065D + 0.985 nm 1.96
where D is particle diameter in nm.

85

Instrument Calibration Technique for Nano Particle Functional Property Measurement System - Calibration for Detection Efficiency of Standard Particle Counters

This document describes calibration procedure of particle counter with counting efficiency. The calibration system is belonging to nanoparticle functional property measurement system (D27). The system is majorly established by TSI commercial instrument and provide for the calibration of particle counter with measuring range from 10^3 cm^-3 to 10^4 cm^-3 with particle size 50 nm~200 nm.

86

Measurement System Validation Procedure for Nano Particle Functional Property Measurement System-Calibration for Detection Efficiency of Standard Particle Counters

This document describes the uncertainty evaluation of detection efficiency calibration of standard particle counter by using the Faraday-Cup Aerosol Electrometer (FCAE). The calibration system is designed and assembled by CMS, including a commercial FCAE, a DMA and a CPC. The calibration system is belonging to nanoparticle functional property measurement system (D27).

87

Instrument Calibration Technique for Nano Particle Functional Property Measurement System-Calibration for Detection Efficiency of Standard Particle Counters at Low Concentration Levels

This document describes calibration procedure for counting efficiency of particle counters at low concentration levels. The calibration system, designed and assembled at National Measurement Laboratory, consists of a commercial Faraday-Cup Aerosol Electrometer (FCAE), a Differential Electrical Mobility Classifier (DEMC) and a Condensation Particle Counter (CPC). This system provide the calibration service for the counting efficiency of particle counters at low concentration levels with measuring range from 1 cm^-3~10^3 cm^-3 in particle size 100 nm. The calibration system is a part of Nanoparticle Functional Property Measurement System (D27).

88

Measurement System Validation Procedure for Nano Particle Functional Property Measurement System-Calibration for Detection Efficiency of Standard Particle Counters at Low Concentration Levels

This document describes the uncertainty evaluation for counting efficiency of particle counters at low concentration levels. The calibration system, designed and assembled at National Measurement Laboratory, consists of a commercial Faraday-Cup Aerosol Electrometer (FCAE), a Differential Electrical Mobility Classifier (DEMC) and a Condensation Particle Counter (CPC). This system provide the calibration service for the counting efficiency of particle counters at low concentration levels with measuring range from 1 cm-3~103 cm-3 in particle size 100 nm. The calibration system is a part of Nanoparticle Functional Property Measurement System (D27).
The uncertainty analysis of measurement results is based on ISO/IEC Guide 98-3:2008. The uncertainty sources from the measurement instruments and process are considered and evaluated. The obtained results show that the existing measuring system provides the following calibration capability:
‧Calibration item: Standards aerosol particle counter
‧Measuring range: particle number concentration from 1 cm^-3 to 103 cm^-3 with particle size of 100 nm
‧Relative Expanded uncertainty:
size   Concentration (cm^-3) Relative expanded uncertainty of detection efficiency(%)
100 nm 1                                       3.1
100 nm 10                                       1.6
100 nm 100                                       1.2
100 nm 1000                                     0.8

‧Confidence level: 95 %
‧Coverage factor: 2.0

89

Performance enhancement of DMA-CPC for ultrafine aerosol measurement by using self-assemble particle charger

There are several kinds of particles in the air, such as PM2.5 and PM1.0. The particles are easier to enter into the human body when the size of particle is smaller or the quantity of the particle is more and cause the lung disease, inflammation, damage of the immune system or cancers. Therefore, the size and concentration of particles are the preliminary index of environmental pollution.
Differential Mobility Analyzer - Condensation Particle Counter (DMA-CPC) has been widely used to measure the size distribution and concentration of particle currently. Given that the charged-particles with different sizes have different mobility under the electric field, DMA is able to classify the particle with the specific size by applying the specific voltage. The particle with the specific size then enter into the CPC for counting the quantities. However, the particles with the size lower than 100 nm have lower charging efficiency which leads to less charged-particle could be classified by DMA and influence the measurement result. To improve the charging efficiency of the small particle (size <100 nm), the study developed a particle charger and evaluated the effect of it by two size standard samples (Gold-20 nm and 10 nm) and compared the results with the commercialized soft-x ray particle charger.

90

Single particle inductively coupled plasma mass spectrometry acceptance report

The D27 system of the National Measurement Laboratory was replaced to ensure the calibration and measurement capabilities

91

Instrument Calibration Techniques for Low Pressure Gas Flow Calibration System(F06)-Comparison Method /MOLBLOC

This document is the operational guide of the Low Pressure Gas Flow Calibration System (System Code : F06) for calibrating gas meters by comparison method at the National Measurement Laboratory. The actual mass flowrate is obtained directly from the panel of MOLBLOC/MOLBOX1. The relative deviation is obtained by subtracting the actual flowrate from the apparent flowrate and then dividing this difference by the actual flowrate.
Based on ISO/IEC Guide 98-3: 2008, the measurement uncertainty of calibration results for flowmeter was evaluated with Type A and Type B evaluations for various uncertainty sources. The standard uncertainties (or relative standard uncertainties) and degrees of freedom of the various sources were evaluated individually, and then combined together to give the combined standard uncertainty (or relative combined standard uncertainty) and effective degrees of freedom. Finally, the expanded uncertainty (or relative expanded uncertainty), obtained by multiplying the combined standard uncertainty (or relative combined standard uncertainty) with a coverage factor at the 95 % confidence level, is used to express the result of calibration.
The calibration capability of the system is expressed as follows:
Environmental temperature: 22 °C to 24 °C
Upstream pressure of MOLBLOC/MOLBOX1: 350 kPa
Volume flowrate of MOLBLOC/MOLBOX1: 2 cm3/min to 24 L/min
Gas: Air or nitrogen
Combined relative standard uncertainty of volume flow rate is 0.067 % and coverage factor is 1.97. Relative expanded uncertainty of mass flow rate is 0.14 %.
Combined relative standard uncertainty of performance indicator is 0.068 % and coverage factor is 1.97. Relative expanded uncertainty of performance indicator is 0.14 %.
Combined relative standard uncertainty of mass flow rate is 0.061 % and coverage factor is 1.98. Relative expanded uncertainty of mass flow rate is 0.13%.
Combined relative standard uncertainty of performance indicator is 0.064 % and coverage factor is 1.97. Relative expanded uncertainty of mass flow rate is 0.13%.

92

CNPA 137 membrane gas meter type certification technical specification amendment draft

This specification applies to membrane gas meters; that is, gas volume flow meters that use a measuring chamber with a deformable chamber wall to measure gas flow; including built-in correction devices and internal temperature compensation devices, and other additional gas meters (electronic) devices that affect metering performance.

93

Long-term Accuracy Research of Membrane Gas Meter

Natural gas is not only an important livelihood and industrial material, but also play a key role in the policy of meeting electricity demand, energy saving and carbon reduction. Household gas must use the "gas meter" as the basis for gas company gas to measure and price gas. Since the internal structure of the "gas meter" is mainly thin film, it is also called "membrane gas meter". In order to ensure and improve the quality of membrane gas meters, the Bureau of Standards has implemented a pattern approval system for membrane gas meters since 2004 and it has been implemented for more than 10 years. At present, more than 3.5 million membrane gas meters have been installed across the country. In 2004, Bureau of Standards implemented inspections, whether the manufacturers that can actually implemented self-verification and self-inspection. And whether manufacturer of the membrane gas meter complies with the relevant regulations newly added or revised by the Bureau of Standards in 2003. After inspection, there are several conclusions: First, there are a small number of membrane gas meters currently in use on the market that have not been type approved; Second, at present, the membrane gas meter that has passed the maintenance verification does not regulate the exit mechanism and the duration of service. The Bureau of Standards considers that the duration of service of the specification has a wide range of impacts and needs to be carefully evaluated, because it may affect the willingness of manufacturers to continuously improve the meter. Therefore, Center of Measurement Standard(CMS) conducts a research for the long-term accuracy of household membrane gas meters.
This project uses Six Sigma DMADV for project management, and uses quality methods (Qquality function deployment (QFD), 5M1E analysis, failure mode and effect analysis (FMEA), etc.) According to CNMV31[3], ISO/IEC 17043[5], ISO 9001[6], ISO/IEC 17025[7] and other standards/standards, through the ITRI conference management system, Team Space system for plan execution control and teamwork, so that the plan can follow the planned progress and complete the expected research content. Finally, through the research results, assist the competent authority to ensure that the measurement of household gas meters is fair, just and safe.

94

Automation Software Operation Manual of Circulating High-pressure Gas Flow Calibration System

This manual for automated software operation procedure is the basis of the circulating high-pressure gas flow calibration system of Flow & Energy Research Laboratory.

95

Air to liquid volumetric ratio technical specifications for verification and inspection research report

The implementation year of this plan is 2021. Provide BSMI (Bureau of Standards, Metrology and Inspection, MOEA) the air to liquid volumetric ratio technical support. Tasks of project are development of technical specification of verification and inspection for air to liquid volumetric ratio, Design and establish of verification and inspection facility, etc. The contents of this document include, air to liquid volumetric ratio verification and inspection measuring instrument standard operating procedure and the uncertainty evaluation report

96

OIML D 31 2019 General requirements for software-controlled measuring instruments

The content of this document is general requirements for software-controlled measuring instruments

97

Instrument Calibration Techniques for Circulation High Pressure Air-Flow Calibration System

This operating procedure is to provide the basis for calibrating the gas flowmeter of the circulating high-pressure gas flow system (system code F05) of the National Measurement Laboratory (NML). When calibrating, inflate and adjust the pressure value of pipeline, run the blower and set the blower’s speed to reach the required flow rate, and run the ice water system to reach the set fluid temperature. When the pressure and temperature are stable, start to record the volume, temperature, pressure and corresponding calibration time of the meter under test (MUT) and the standard flowmeter, and calculate the relative errors of the meter under test based on these parameters.
         The uncertainty analysis is according to ISO/IEC Guide 98-3:2008(GUM). The considered uncertainty categories that affect the calibration results are estimated through either Type A or Type B evaluation. The combined standard uncertainty of the measurement result is then obtained by taking the root-sum-squared (RSS) of each uncertainty component multiplied by its sensitivity coefficient. The expanded uncertainty is obtained by multiplying the combined standard uncertainty with the coverage factor at the 95 % confidence level, which is obtained based on the effective degrees of freedom calculated by Welch-Satterthwaite equation.
         This system is applicable to calibration for differential pressure flowmeter, Coriolis flowmeter, laminar flowmeter, turbine flowmeter, rotary flowmeter, heat mass flowmeter, ultrasonic flowmeter, vortex flowmeter. The measurement range is shown as below:
Working fluid: Dry air;
Actual volume flowrate:( 25 to 2000 ) m3/h;
Standard volume flowrate:( 125 to 110000 ) m3/h @ ( 101.325 kPa , 23 ℃ );
Mass flowrate:( 150 to 132000 ) kg/h;
Cumulative total volume:( 6.25 to 166.67) m3 @ ( 25 to 2000 ) m3/h;
Pressure:( 500 to 5500 ) kPa (absolute);
Temperature:ambient temperature。

98

Measurement System Validation Procedure for High Pressure Gas Flow Calibration System–Comparison Method/Recirculating Flow

This document describes the uncertainty evaluation procedure of the circulating high-pressure gas flow calibration system (system code F05) of the National Measurement Laboratory (NML). The working standard units are eight 2-inch rotary meters and two 6-inch ultrasonic flowmeters. The mass flow rate of the standard unit is directly calculated by measuring the temperature, pressure and actual volume flow rate of the standard unit. Divide the mass flow rate of the standard unit by error correction factor to obtain the passing standard mass flow rate. It is also possible to convert the standard mass flow rate of the standard unit to the actual state (or reference state) of the under-calibrated flowmeter, and then compare the actual (or reference) volume flow rate between the standard unit and the under-calibrated flowmeter.   The uncertainty analysis is according to ISO/IEC Guide 98-3:2008(GUM). The considered uncertainty categories that affect the calibration results are estimated through either Type A or Type B evaluation. The relative combined standard uncertainty of the measurement result is then obtained by taking the root-sum-squared (RSS) of each uncertainty component multiplied by its sensitivity coefficient. The relative expanded uncertainty is obtained by multiplying the relative combined standard uncertainty with the coverage factor at the 95 % confidence level, which is obtained based on the effective degrees of freedom calculated by Welch-Satterthwaite equation. The calibration capability of this facility is shown as below: Working fluid:Dry air; Actual volume flowrate:( 25 to 2000 ) m3/h; Standard volume flowrate:( 125 to 110000 ) m3/h @ ( 101.325 kPa , 23 ℃ ); Mass flowrate:( 150 to 132000 ) kg/h; Cumulative total volume:( 6.25 to 166.67) m3 @ ( 25 to 2000 ) m3/h; Pressure:( 500 to 5500 ) kPa (absolute); Temperature:ambient temperature。 The uncertainty of the calibration and measurement capability with a 95 % level of confidence UCMC: Standard Unit Standard System Base Including Device 2” rotary transfer standard meter UBase = 0.20 % UCMC = 0.20 % k = 1.98 k = 1.98 veff = 150 veff = 151 Eight 2” rotary standard meter UBase = 0.23 % UCMC = 0.23 % k = 1.97 k = 1.97 veff = 239 veff = 240 Two 6” ultrasonic standard meter UBase = 0.25 % UCMC = 0.25 % k = 1.97 k = 1.97 veff = 299 veff = 300

99

Research Report of the Oil Meter Accuracy

The 10 L black tank used by gas station operators has the characteristics of light weight and thin wall in comparison with the 10 L stainless steel tank. The measurement characteristics of the black tank may change due to environmental temperature or long-term usage. In this study, we studied the differences of the measurement characteristics between the stainless steel tank and the black tank by the residual water experiment, short-term and long-term ambient temperature experiment. The results showed that the residual water volume, ambient temperature, and reproducibility had little effect on the black tank. In addition, the color of the neck wall of the black tank is black so that the curved liquid level is not clear for visual inspection. The resolution of the black tank is 10 mL larger than the stainless steel tank. Therefore, the inspection of the black tank should be carried out in a well-lit environment to avoid reading errors.

100

Certification of reference gases mixture stability evaluation

This technical report, by means of the gas chromatograph and analyzer system testing capabilities, is aimed at the prepared CO in N2, CO2 in N2, CH4 in N2, C3H8 in N2, CF4 in N2, SF6 in N2, NO in N2, SO2 in N2, O2 in N2, CH4 in air, CO+CO2+C3H8 in N2, H2S in N2, N2O in N2, C2H5OH in N2, C2H5OH in air and VOCs in N2 (including Benzene, Toluene, Ethylbenzene, Xylenes) and other Certification reference gases mixture Concentration comparison analysis and concentration stability evaluation, record the evaluation record in this technical file.

101

Raw material purity analysis for Primary Reference Gas Mixtures preparation

This technical report describes the gravimetric high pressure cylinder gas mixture supply and certification System (C08), using gas chromatograph (GC-DID/FID and GC-SCD/FID), gas chromatography mass spectrometer (GC-MS), fourier transform infrared spectrometer (FTIR), nitrogen oxide analyzer (NOx Analyzer), and sulfur dioxide analyzer (SO2 Analyzer) to analyze the purity of the raw materials used in the preparation of the primary reference gas (primary reference gas mixtures, PRM) , and to assess whether it meets the requirements of the raw material specifications for preparation, and compile the raw material purity analysis records over the past years.

102

Measurement System Validation Procedure for the Measurement of Cylinder Gas Concentration

This report describes the procedure of accuracy assessment for the measurement of gas concentrations in cylinder, and provides a basis for evaluation of uncertainties in the measurements performed in our laboratory. According to the measurement method and the corresponding functional relationship between concentration and the associated variables, the components of uncertainty include: 1) standard uncertainty of replicated measurements, ; 2) concentration standard uncertainty of reference standards, ; 3) standard uncertainty of system stability, . This document states the evaluation for each item listed above, sets the measurement range and the expanded uncertainty of this measuring system, and serves as a reference guide for industries that request our measurement services. This system is belonged to the Gas Concentration Measurement System (C03). The measuring range for CO is (10 to 200000) μmol/mol. The measuring range for CO2 is (100 to 300000) μmol/mol. The measuring range for CH4 is (100 to 100000) μmol/mol. The measuring range for C3H8 is (100 to 50000) μmol/mol. The measuring range for O2 is (1000 to 250000) μmol/mol. The measuring range for C2H5OH is (137 to 547) μmol/mol. The measuring range for NO is (50 to 2000) μmol/mol. The measuring range for SO?2 is (50 to 2000) μmol/mol. While claimed as smallest or best expanded uncertainty, results are shown as below.

Components Ranges
(μmol/mol) Smallest Expanded Uncertainty
(μmol/mol)
CO 10 to 1000
>1000 to 10000
>10000 to 200000 0.08
9
90
CO2 100 to 1000
>1000 to 10000
>10000 to 300000 1.1
12
120
CH4 100 to 1000
>1000 to 10000
>10000 to 100000 0.9
8
80
C3H8 100 to 1000
>1000 to 10000
>10000 to 50000 1.0
6
60
O2 1000 to 10000
>10000 to 250000 12
120
C2H5OH 137
301
547 1.7
3.2
4.3
NO 50 to 2000 0.89
SO2 50 to 2000 0.82

103

Instrument Calibration Technique for the Concentration Calibration of Gas Dilutor-Gas Chromatography

The method of this study is referred to ISO 6145-7:2009 and U.S. EPA/600/R-12/531 . This document describes the application of Gas Chromatography (GC) for the certification of the concentrations of binary gas mixtures (CO2 in N2, CO in N2 and CH4 in air) in gas cylinders and in gas dilutor. Furthermore, the result can be used to calibrate the dilution factor of gas dilutor.   The calibration curve is constructed by measuring the GC signals of several calibration standards, then combination with span gas and zero gas to prepare difference concentration of gas mixtures using the gas diluter to be calibrated. The concentrations generated by setting different dilution factor are determined by the calibration curve, and the measurement uncertainties are evaluated accordingly. This document contains the descriptions of apparatus, calibration procedure, data analysis, and format of report.

104

Measurement System Validation Procedure for the Concentration Calibration of Gas Dilutor-Gas Chromatography

This research describes the application of Gas Chromatography for the calibration of the concentrations of binary gas mixtures in gas dilutor, and provides a basis for evaluation of uncertainties in the certification performed in our laboratory. According to the calibration method and the corresponding functional relationship between concentration and the associated variables, the components of uncertainty include: 1) concentration expanded uncertainty of gas dilutor; 2) concentration expanded uncertainty of span gas; 3) standard uncertainty of system stability. This document explains how to evaluate each item listed above, sets the certification range and the expanded uncertainty for our measuring system, and serves as a reference guide for industries that request our certification services. This procedure applies to the validation of gas diluter within the range shown in the document.This document is part of the Gas Measurement System (System code: C07).

105

Production Guidelines for Certified Reference Material – Lead Standard Solution

This production guideline for certified reference material, lead standard solution, provides the operation procedure of solution preparation, and according to ISO Guide 34:2009, makes a description of the related quality documents and notice in the production procedure for the laboratory colleague.

106

Instrument Calibration Technique for Isotope Ratio- Mass Spectrometry

This calibration procedure is provided for the operation of multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS) to measure silicon isotope ratio, belonging to Isotope Ratio Measurement System (C14) in National Measurement Laboratory (NML). An appropriate concentration of silicon solution (0.5 mg/kg to 50 mg/kg) having a purity of greater than 99.9 % is introduced into MC-ICP-MS where the three silicon isotope signals (28Si, 29Si, 30Si) can be simultaneously detected with three individual signal receptors. In this way, a precise silicon isotope ratio can be obtained.

107

Measurement System Validation Procedure for Isotope Ratio Analyzer - Mass Spectrometry

This measurement system validation procedure is provided to Isotope Ratio Measurement System (C14) in National Measurement Laboratory (NML). This document states the evaluation of the uncertainty of the measured silicon isotope ratios, as the reference for laboratory colleagues to process the calibration service. In according to the measurement equations, the evaluation items of the uncertainty source include: 1) the uncertainty of the true value of the isotope ratio of the standard material; 2) the uncertainty of isotope ratio measurement process of the standard material; 3) the uncertainty of isotope ratio measurement process of the calibrated material. The announced service range and corresponding expanded uncertainty, shown as the table below, are used as a reference for the industry to apply for a measurement service.

108

Repeatability test for on-line gas chromatography system

Repeatability test of nature gas for on-line gas chromatography system, in accordance with ASTM D1945 and ASTM D7164 standard.

  • Last Updated:2022/05/20
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