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In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
New Zealand, MSL (Measurement Standards Laboratory)
Spectral properties of materials , Transmittance, diffuse, spectral : 1.00E-4 to 4.00E-3
Spectrally-neutral material
Absolute expanded uncertainty : 2.0E-4
Spectrophotometer, integrating sphere
Wavelength range : 400 nm to 1000 nm
Bandwidth : 1 nm to 3 nm
Specific measurement conditions : 0/d
Other types of material can also be calibrated
Approved on 20 October 2005
Institute service identifier : MSLT.O.020
Spectral properties of materials , Transmittance, diffuse, spectral, T : 0.1 to 1
Spectrally-neutral material
Relative expanded uncertainty
0.05T
Spectrophotometer, integrating sphere
Wavelength range : 300 nm to 400 nm
Bandwidth : 1 nm to 3 nm
Specific measurement conditions : 0/d
Other types of material can also be calibrated
Approved on 20 October 2005
Institute service identifier : MSLT.O.020
Properties of detectors , Responsivity, spectral power
Broadband detector
Relative expanded uncertainty : 8.0E-2 %
Monochromator and reference detectors
Wavelength range : 680 nm to 800 nm
Bandwidth : 1 nm to 5 nm
Power level : 0.1 µW to 10 µW
Approved on 20 October 2005
Institute service identifier : MSLT.O.040 or MSLT.O.009
Photometry , Illuminance responsivity, tungsten source
Illuminance meter
Relative expanded uncertainty : 0.8 %
Standard lamp
Illuminance : 10 lx to 3000 lx
Correlated colour temperature : 2700 K to 3000 K
Approved on 21 October 2001
Institute service identifier : MSLT.O.001, MSLT.O.016
Items for defining ITS-90 , Temperature : 419.527 °C
Zinc freezing point cell
Absolute expanded uncertainty : 1.9 mK
Comparison with reference cell(s)
Temperature controlled furnaceModified on 09 February 2015
Approved on 24 June 2004
Institute service identifier : MSL/T6
Items for defining ITS-90 , Temperature : 231.928 °C
Tin freezing point cell
Absolute expanded uncertainty : 0.82 mK
Comparison with reference cell(s)
Temperature controlled furnaceModified on 09 February 2015
Approved on 24 June 2004
Institute service identifier : MSL/T5
Items for defining ITS-90 , Temperature : -38.8344 °C
SPRT
Absolute expanded uncertainty : 0.4 mK
Mercury triple point cell
Fixed point cellModified on 09 February 2015
Approved on 24 June 2004
Institute service identifier : MSL/T7
Items for defining ITS-90 , Temperature : 0.01 °C
SPRT
Absolute expanded uncertainty : 0.12 mK
Water triple point cell
Modified on 09 February 2015
Approved on 23 November 2009
AC power , AC power and energy: three phase, reactive power : 0 var to 7.20E4 var
Power meter, energy meter, power converter, wattmeter, VAR meters, three phase source
Relative expanded uncertainty
40 + 90QF

values range from 40 µvar/VA to 130 µvar/VA

The uncertainty is expressed in µvar (VA)-1

Power bridge
Reactive power factor, QF : 1 to 0, inductive or capacitive
Voltage : 60 V to 240 V
Current : 0.01 A to 100 A
Frequency : 45 Hz to 75 Hz
Voltage and current ranges are per phase
Approved on 10 November 2014
Institute service identifier : 61b
High voltage and current , AC high voltage transformer: phase displacement : -0.2 rad to 0.2 rad
Voltage transformer bridge
Absolute expanded uncertainty : 5.0E-7 rad to 9.0E-5 rad
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Inject known error voltage
Frequency : 45 Hz to 65 Hz
Voltage : 5 V to 300 V
Approved on 31 October 2016
Institute service identifier : 78
Impedance (up to the MHz range) , Capacitance for dielectric capacitors : 0 µF to 100 µF
Fixed capacitor, switched capacitor, capacitance box: capacitance C
Absolute expanded uncertainty
0.2/f + 22C

f in Hz, C in µF

The uncertainty is expressed in pF

Universal impedance bridge
Frequency f : 40 Hz to 2 kHz
Expanded uncertainty values range from 0.0001 pF to 2200 pF
Approved on 22 November 2006
Institute service identifier : 39
AC current , AC current up to 100 A: meters : 0.2 A to 100 A
AC ammeter, multimeter, multifunction transfer standard
Relative expanded uncertainty : 2.5E1 µA/A
Calibrated shunts, current transformers, and ac voltmeters
Frequency : 47 Hz to 75 Hz
Approved on 22 November 2006
Institute service identifier : 59a
AC current , AC current up to 100 A: sources : 0.01 A to 100 A
Multifunction calibrator, transconductance amplifier
Relative expanded uncertainty : 2.5E1 µA/A
Calibrated shunts, current transformers, and ac voltmeters
Frequency : 47 Hz to 75 Hz
Approved on 22 November 2006
Institute service identifier : 58a
Impedance (up to the MHz range) , AC resistance: real and imaginary component : 0 MΩ to 1 MΩ
Fixed resistor: resistance R
Absolute expanded uncertainty
2000/f + 19R

f in Hz, R in Ω

The uncertainty is expressed in µΩ

Universal impedance bridge
Frequency f : 40 Hz to 2 kHz
Expanded uncertainty values range from 1 µΩ to 19 Ω
Approved on 22 November 2006
Institute service identifier : 46
DC voltage (up to 1100 V) , DC voltage meters: intermediate values : 1.00E-3 V to 12 V
DC voltmeter, multimeter, multifunction transfer standard: voltage V
Absolute expanded uncertainty
0.05 + 0.15V

V in V, values range from 0.05 µV to 1.85 µV

The uncertainty is expressed in µV

Comparison with reference standard
Ambient temperature : 15 °C to 30 °C
Approved on 22 November 2006
Institute service identifier : 7
Impedance (up to the MHz range) , AC resistance: real component : 0 Ω to 400 Ω
Fixed resistor: resistance R
Absolute expanded uncertainty
6 + 0.3R

R in Ω

The uncertainty is expressed in µΩ

Resistance ratio bridge
Frequency : 0.01 Hz to 100 Hz
Expanded uncertainty values range from 6 to 126 µΩ
Approved on 22 November 2006
Institute service identifier : 46a
Radio frequency measurements , RF voltage: meters : 1 V to 3 V
RF voltmeter
Relative expanded uncertainty : 0.3 mV/V to 8 mV/V
Comparison with calibrated source or meter
Frequency : 1 MHz to 100 MHz
Approved on 10 November 2014
Institute service identifier : 66
Spectral properties of materials , Transmittance, regular, spectral : 1.00E-4 to 0.01
Spectrally-neutral material
Absolute expanded uncertainty : 5.0E-5
Spectrophotometer
Wavelength range : 380 nm to 1000 nm
Bandwidth : 1 nm to 3 nm
Approved on 27 September 2004
Institute service identifier : MSLT.O.006
Items for defining ITS-90 , Temperature : 29.7646 °C
Gallium melting point cell
Absolute expanded uncertainty : 0.13 mK
Comparison with reference cell(s)
Temperature controlled furnaceModified on 09 February 2015
Approved on 24 June 2004
Institute service identifier : MSL/T3
Form , Roundness standards : 0 µm to 400 µm
External cylinder
Absolute expanded uncertainty
Q[0.14, 0.05R]

R in µm

The uncertainty is expressed in µm

Stylus on spindle roundness instrument
Diameter : 1 mm to 300 mm
Approved on 28 January 2010
Institute service identifier : MSL/19

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