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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)
India, NPLI (CSIR National Physical Laboratory of India)
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Amount-of-substance fraction in nmol/mol Absolute expanded uncertainty in nmol/mol Amount-of-substance fraction in Absolute expanded uncertainty in
air ozone 0 to 500
  • Uncertainty equation CMC : Q[1.0, 0.022x(O3)]

    The uncertainty is expressed in nmol/mol

  • Mechanism for measurement service delivery : Calibration service with SRP
  • The notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a2 + b2]1/2
  • Approved on 20 January 2016
  • Institute service identifier : 01
Frequency , Frequency : 1 MHz
General frequency source
Relative expanded uncertainty : 6.4E-12 Hz/Hz
Direct frequency measurement
Gate time : 10 s
Number of measurements : 100
Amplitude : > 0.5 V (50 ohm)
Excluded DUT's effect
Approved on 15 June 2011
Institute service identifier : NPLI/6
Frequency , Frequency : 5.00E6 Hz
General frequency source
Relative expanded uncertainty : 9.0E-14 Hz/Hz
Time interval measurement
Measurement time : 86400 s
Amplitude : > 1 V (50 ohm)
Excluded DUT's effect
Approved on 15 June 2011
Institute service identifier : NPLI/4
Measurement microphones , Pressure sensitivity level
Laboratory standard microphone type: IEC 61094-1 LS1P microphone
Absolute expanded uncertainty : 7.0E-2 dB
IEC 61094-2
Frequency : 63 Hz to 2 kHz
Approved on 23 October 2009
Institute service identifier : AUV.NPL.1101
Measurement microphones , Pressure sensitivity level
Laboratory standard microphone type: IEC 61094-1 LS1P microphone
Absolute expanded uncertainty : 8.0E-2 dB
IEC 61094-2
Frequency : 2.5 kHz to 8 kHz
Approved on 23 October 2009
Institute service identifier : AUV.NPL.1101
Measurement microphones , Pressure sensitivity level
Laboratory standard microphone type: IEC 61094-1 LS2P microphone
Absolute expanded uncertainty : 8.0E-2 dB
IEC 61094-2
Frequency : 125 Hz to 200 Hz
Approved on 23 October 2009
Institute service identifier : AUV.NPL.1201
Measurement microphones , Pressure sensitivity level
Laboratory standard microphone type: IEC 61094-1 LS2P microphone
Absolute expanded uncertainty : 0.12 dB
IEC 61094-2
Frequency : 31.5 Hz to 50 Hz
Approved on 23 October 2009
Institute service identifier : AUV.NPL.1201
Measurement microphones , Pressure sensitivity level
Laboratory standard microphone type: IEC 61094-1 LS2P microphone
Absolute expanded uncertainty : 0.11 dB
IEC 61094-2
Frequency : 63 Hz to 100 Hz
Approved on 23 October 2009
Institute service identifier : AUV.NPL.1201
Measurement microphones , Pressure sensitivity level
Laboratory standard microphone type: IEC 61094-1 LS2P microphone
Absolute expanded uncertainty : 0.12 dB
IEC 61094-2
Frequency : 16 kHz
Approved on 23 October 2009
Institute service identifier : AUV.NPL.1201
Radio frequency measurements , Scalar RF reflection coefficient and attenuation: reflection coefficient in waveguides : 0.01 to 0.2
Passive device: matched termination and standard mismatche
Absolute expanded uncertainty : 2.0E-3 to 3.0E-3
Tuned reflectometer technique
Frequency : 5.8 GHz to 18 GHz (spot frequency)
Approved on 10 November 2014
Institute service identifier : NPLI/73
DC current (up to 100 A) , DC current sources: intermediate values : 1.00E-4 A to 20 A
Current generator, calibrator
Relative expanded uncertainty : 5.5 µA/A to 1.0E1 µA/A
{"row_1":{"col_1":"","col_2":"Relative expanded uncertainty / (µA/A)"},"row_2":{"col_1":"1E-04 A to 2 A","col_2":"5.5 to 7"},"row_3":{"col_1":"2 A to 20 A","col_2":"7 to 10"}}
Voltage drop across reference resistor
Approved on 10 November 2014
Institute service identifier : NPLI/17
DC resistance , DC resistance standards and sources: multiple ranges : 10 Ω to 1.00E6 Ω
Multifunction calibrator
Relative expanded uncertainty : 0.1 mΩ/Ω to 1 mΩ/Ω
Comparison
Approved on 10 November 2014
Institute service identifier : NPLI/2.1.5
DC voltage (up to 1100 V) , DC voltage sources: intermediate values : 10 V to 1000 V
DC voltage source, multifunction calibrator
Relative expanded uncertainty : 1.5 µV/V to 4.5 µV/V
{"row_1":{"col_1":"","col_2":" Expanded uncertainty","col_3":"******** Instrument ********"},"row_2":{"col_1":"1 V","col_2":"80 nV","col_3":"Solid state voltage standard"},"row_3":{"col_1":"1.018 V","col_2":"80 nV","col_3":"Solid state voltage standard"},"row_4":{"col_1":"10 V","col_2":"350 nV","col_3":"Solid state voltage standard"},"row_5":{"col_1":"1.018 V to 12 V","col_2":"1 µV/V","col_3":"Standard cell"},"row_6":{"col_1":"10 µV to 10 V","col_2":"1.5 µV to 15 µV","col_3":"DC voltage source, multifunction calibrator"},"row_7":{"col_1":"10 V to 1000 V","col_2":"1.5 µV/V to 4.5 µV/V","col_3":"DC voltage source, multifunction calibrator"},"row_8":{"col_1":"10 µV to 1 mV","col_2":"1.5 µV","col_3":"DC voltmeter, multimeter"},"row_9":{"col_1":"1 mV to 10 V","col_2":"1.5 µV to 15 µV","col_3":"DC voltmeter, multimeter"},"row_10":{"col_1":"10 V to 1000 V","col_2":"1.5 µV/V to 4.5 µV/V","col_3":" Multifunction transfer standard, DC voltmeter"}}
Resistive divider
Approved on 10 November 2014
Institute service identifier : NPLI/4
DC voltage (up to 1100 V) , DC voltage ratios: up to 1100 V : 0.1 to 100
Resistive divider
Relative expanded uncertainty : 2 µV/V
Comparison with reference divider
Input voltage : 1 V to 1000 V
Approved on 10 November 2014
Institute service identifier : NPLI/8
Pressure , Differential pressure, gas medium : 30 kPa to 150 kPa
Pressure measuring device, pressure balance
Absolute expanded uncertainty
(2.5E-06pl)2 + (2.9E-05Dp)2]1/2, pl line pressure in Pa and Dp differential pressure in P

pl line pressure in Pa and Dp differential pressure in Pa

The uncertainty is expressed in kPa

Direct comparison with standard
Line pressure : 0.1 MPa to 12 MPa
Approved on 12 October 2009
Institute service identifier : NPLI/12
Pressure , Absolute pressure: gas medium : 6.5 kPa to 360 kPa
Pressure measuring device
Absolute expanded uncertainty
(1.4E-01)2 + (12E-06p)2]1/2, p pressure in Pa

p pressure in Pa

The uncertainty is expressed in Pa

Direct comparison with standard
Gas species : Nitrogen
Gas purity : 99.9 % or better
Temperature : 23 °C
Approved on 12 October 2009
Institute service identifier : NPLI/28
Pressure , Gauge pressure: gas medium : 0.036 MPa to 4 MPa
Pressure measuring device, pressure balance
Absolute expanded uncertainty
22E-06p

p pressure in MPa

The uncertainty is expressed in MPa

Direct comparison with standard
Gas species : Nitrogen
Gas purity : 99.9 % or better
Temperature : 23 °C
Approved on 12 October 2009
Institute service identifier : NPLI/30
Pressure , Gauge pressure: gas medium : 12 MPa to 20 MPa
Pressure measuring device, pressure balance
Absolute expanded uncertainty
33E-06p

p pressure in MPa

The uncertainty is expressed in MPa

Direct comparison with standard
Gas species : Nitrogen
Gas purity : 99.9 % or better
Temperature : 23 °C
Approved on 12 October 2009
Institute service identifier : NPLI/32
Pressure , Gauge pressure: gas medium : 4 MPa to 8 MPa
Pressure measuring device, pressure balance
Absolute expanded uncertainty
26E-06p

p pressure in MPa

The uncertainty is expressed in MPa

Direct comparison with standard
Gas species : Nitrogen
Gas purity : 99.9 % or better
Temperature : 23 °C
Approved on 12 October 2009
Institute service identifier : NPLI/31
Pressure , Gauge pressure: liquid medium : 200 MPa to 500 MPa
Pressure measuring device, pressure balance
Absolute expanded uncertainty
135E-06p

p pressure in MPa

The uncertainty is expressed in MPa

Direct comparison with standard
Temperature : 23 °C
Approved on 12 October 2009
Institute service identifier : NPLI/11

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