National Measurement Standards

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NML has established national measurement standards in 15 fields used for providing calibration services and forming the chain of traceability . Six primary standards are established in the laboratory and each has built up its own traceability.  Over 110 systems have been currently established in NML.

Present status of national standards of measurement in 15 fields are listed below.

ParameterUnitStandardExpanded UncertaintyTraceability/Definition
Dimension
Length
m He-Ne/I 2 stabilized laser (633 nm) 24 kHz
NML direct realization of meter
Recommendation 1 (CI-1997
Temperature
Temperature
K Ar (Tp)-Cu (Fp)
ITS-90 (83.8058-1234.93K):Sn, Zn, Al, Ag
Ar, Hg, H 2 O, Ga, In
0.2~10mK Direct realization of ITS-90
Humidity
Humidity
Dew Point
RH ℃ 8 - 95% RH (5~ 60℃)
Dew Point Hygrometer (-50~20℃)

1%RH
0.2℃

NML, TAIWAN
NIST
Chemistry

Cylinder gas


Permeation gas
Permeation tube

pH
Viscosity
w/w

v/v mg/min
pH m 2 /s
Primary standard materials:CO/N 2 (10ppm~10%), CO2 /N 2 (1~16%), C 3 H 8 /N 2 (1~5%), NO/N2 (60ppm~10%), CH 4 /N 2 (20ppm~10%), CO+CO 2 / N 2 , CO+C 3 H 8 /N 2 , CO+CO 2 +C 3 H 8 /N 2
SO2/N2,SO2/air (50ppb~20ppm)
SO2(2~15cm active length)1-6mg/min at 30℃
1~ 13pH (0~ 50℃)
Viscosity standard, 1~2´10 5 m 2 /s

0.0012%~0.23% (relative percent)

0.5% R.S.
0.06% R.S.

0.005 pH
0.4~1%
NML, TAIWAN

NML, TAIWAN
NML, TAIWAN

NML, TAIWAN
NIST
Microwave
Microwave Power

Electric Field Intensity
Scattering Parameter andImpedance

Attenuation

Noise Source


Noise Figure


RF Impedance
W

V/m

dB

dB
dB

pF

W

Power Sensor

0~300 V/m  Field Probe
(100 kHz~6GHz)

Verification Kit

Attenuator:-127 dB
(50 MHz~26.5 GHz)
Noise source


Noise source

Standard Capacito
r,Terminator:無下限~100pF
(10~60 MHz)
Terminator:50W
100mW/10 mW
(10 MHz~18 GHz)
1.8~2.2%
0.8~1.3 dB
Reflection Coefficient:
0~1
(45 MHz~26.5 GHz)
:0.003~0.02
0.04~0.5 dB
0.1~0.2dB
Frequency:10MHz~18GHz
ENR:4~20dB

0.2~0.5 dB
Frequency:10 MHz~18GHz
Noise figure:0~30dB

Capacitance: 0.019p
FResistance: 0.146W
NML, TAIWAN

NPL

NIST

PTB

NML, TAIWAN




NIST
Optical Radiation
Absolute Optical
Radiometer
W Standard Lamp
380~780 nm:0.2%
300~9000 nm:0.5%


Direct realization of
Candela
Magnetics
NMR
Low Magnetic Field
Fluxmeter
VSM
T T Wb emu
NMR Gaussmeter:0.05~1.5 T
Hemholtz Coil:10 -7 ~0.05T
Calibrator:10 -4 ~10 Wb
Ni ball:10 -3 ~300 emu

70 ppm
0.5~1%
0.04%
1%

NML, TAIWAN
NML, TAIWAN
NML, TAIWAN
NIST
Flow
Small Air FlowSystem (ambient)

High Pressure AirFlow System
Water System
Oil System
Bell Prover (60 L, 600L)
1pm

Nm 3 /hr
1pm 1pm
L
Volumetric Bell and Piston Provers, Molbloc mass flow meters

Gyroscopic Weighing Scale, Single/Compact Array Sonic Nozzle (s)

Gravimetric Weighing Scale, Mass
Flowmeter

Gravimetric Weighing Scale, Mass Flowmeter, PD Flowmeter
60~600 1pm
0.04~12 1pm:0.12%
30~10,000 Nm 3 /hr,
1~80 bars:0.306%

40~550 1pm:0.03%
200~8,000 1pm:0.08%

2.5~5 cSt: 0.08%
35~150 cSt: 0.07%
0.15%

NML, AIWAN

NML, AIWAN


NML, AIWAN


NML, AIWAN


NML, TAIWAN
Vacuum
Vacuum Gauge
Pa 10 5 ~10 -6 Pa 0.01~10 Pa NIST
Pressure
Hydraulic Pressure
Pneumatic Pressure
Water Column Manometer
Barometer
Pa
Pa
Pa
Pa
2.8~273 MPa

1.4 kPa~7 MPa
0~6 kPa
1~372.5 kPa
41~58 ppm

19~42 ppm
1 Pa
1~7 Pa
NIST

NIST; NML, TAIWAN

NML, TAIWAN

NML, TAIWAN
Electricity

DC Resistance

DC Resistance

Inductance

Capacitance Josephson

Junction Array Voltage


W
W
H
F
V
1W Standard resistor
Quantum Hall Resistance
Standard Inductor
Fused Silica Capacitor
Chip:AC Josephson effect
0.05 ppm
5´10 -9
0.04%
0.2 ppm
40 nV
NML, TAIWAN
Direct realization of ampere
NIST
NIST
Direct realization of ampere
Force
Force
N Standard of mass and local gravitational acceleration 0.002 % NIST, NML, TAIWAN
Mass
Kilogram
kg Mass prototype No.78 4 mg BIPM
Acoustics

Microphone
Reciprocity

Microphone
Comparison

Pistonphone

dB
dB
dB
63~2500 Hzstandard microphone

250 Hzstandard microphone

250 Hzpistonphone
0.06~0.08 dB

0.08 dB

0.09 dB
NML, TAIWAN


NML, TAIWAN


NML, TAIWAN
Vibration Accelerometer
(Laser Absolute)
Accelerometer
(Shock Sensitivity)
g
g
50~10000 Hzstandard accelerometer

100~900 gstandard shock accelerometer
0.4~0.8%

4.0%
NML, TAIWAN
PTB
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