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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)
Serbia, DMDM (Directorate of Measures and Precious Metals)
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
purified air ozone 0 to 1000
  • Uncertainty equation CMC : Q[1.1, 0.022 x(O3)]

    The uncertainty is expressed in nmol/mol

  • Mechanism for measurement service delivery : Instrumental comparison against primary UV photometer Calibration
  • 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 28 June 2016
  • Institute service identifier : GMH-RU-H09
Photometry , Luminous intensity : 1 cd to 1.00E4 cd
Tungsten lamp
Relative expanded uncertainty : 2 %
Photometric bench, reference lamps / photometer
Colour temperature : 2353 K, 2800 K and 2856 K
Approved on 30 September 2010
Measurement microphones , Pressure sensitivity level
Measurement microphone type LS1P
Absolute expanded uncertainty : 8.0E-2 dB
IEC 61094-2:1992
Frequency : 63 Hz to 3.15 kHz
Approved on 27 February 2014
Institute service identifier : DMDM/1.1
Measurement microphones , Pressure sensitivity level
Measurement microphone type LS1P
Absolute expanded uncertainty : 9.0E-2 dB
IEC 61094-2:1992
Frequency : 4 kHz
Approved on 27 February 2014
Institute service identifier : DMDM/1.1
Measurement microphones , Pressure sensitivity level
Measurement microphone type LS2P
Absolute expanded uncertainty : 0.15 dB
IEC 61094-2:1992
Frequency : 16 kHz
Approved on 27 February 2014
Institute service identifier : DMDM/1.2
Measurement microphones , Pressure sensitivity level
Measurement microphone type LS2P
Absolute expanded uncertainty : 0.46 dB
IEC 61094-2:1992
Frequency : 25 kHz
Approved on 27 February 2014
Institute service identifier : DMDM/1.2
Measurement microphones , Pressure sensitivity level
Measurement microphone type LS1P
Absolute expanded uncertainty : 0.14 dB
IEC 61094-2:1992
Frequency : 8 kHz
Approved on 27 February 2014
Institute service identifier : DMDM/1.1
Fluid flow , Volume of liquid : 1 mL to 1.00E4 mL
Glassware equipment (Pipettes, flasks, burettes, cylinders)
Relative expanded uncertainty : 1.5E-2 %
Gravimetric
Liquid : water
Reference temperature : 20 °C
Approved on 17 November 2017
Institute service identifier : DMDM/RU-Z03
Mass , Conventional mass : 1 mg to 100 mg
Mass standard
Absolute expanded uncertainty : 1.3 µg to 2 µg
Comparison in air
Temperature : (20 to 24) °C with max ± 0.3 °C/h and max ± 0.5 °C/12 h
Relative humidity : 40 % to 60 % with max ± 5 % per 4 hours
Pressure : 995 hPa to 1020 hPa
Approved on 04 May 2010
Mass , Conventional mass : 100 kg to 500 kg
Mass standard
Absolute expanded uncertainty : 0.5 g to 8 g
Comparison in air
Temperature : (20 to 24) °C with max ± 1.5 °C/h and max ± 2 °C/12 h
Relative humidity : 40 % to 60 % with max ± 10 % per 4 hours
Pressure : 995 hPa to 1020 hPa
Approved on 04 May 2010
Time scale difference , Time scale difference : -1 s to 1 s
Local clock vs UTC
Absolute expanded uncertainty : 2.0E1 ns
Comparison against post-processed UTC
Averaging time : 5 days
Pulse amplitude : 1 V to 5 V
Slewing rate : > 0.5 V/ns
Fractional part of modulo 1 second difference, integer part can be provided also
Approved on 10 March 2008
Institute service identifier : DMDM/TF-1.1.2b
Frequency , Frequency : 10 MHz
Local frequency standard
Relative expanded uncertainty : 1.0E-13 Hz/Hz
Phase time measurement
Averaging time : 1 day
Approved on 10 March 2008
Institute service identifier : DMDM/TF-2.1.1b
Time interval , Time interval : 1.00E-9 s to 1 s
Delay source
Absolute expanded uncertainty : 0.2 ns
Time interval counter
Slewing rate : 0.5 V/ns
Approved on 10 March 2008
Institute service identifier : DMDM/TF-3.2.4
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -40 °C to 20 °C
Liquid-in-glass thermometer resolution 0.1 °C
Absolute expanded uncertainty : 3.3E-2 °C
Calibration by comparison
Ethanol bath
Approved on 03 November 2009
Institute service identifier : DMDM/T06-4
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -40 °C to 20 °C
Liquid-in-glass thermometer resolution 1 °C
Absolute expanded uncertainty : 0.35 °C
Calibration by comparison
Ethanol bath
Approved on 03 November 2009
Institute service identifier : DMDM/T06-7
Items for disseminating ITS-90 and PLTS 2000 , Temperature : -40 °C to 20 °C
Platinum Resistance Thermometer
Absolute expanded uncertainty : 9.0E-3 °C
Calibration by comparison
Ethanol bath
Approved on 03 November 2009
Institute service identifier : DMDM/T02-1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 300 °C to 600 °C
Base-metal thermocouple
Absolute expanded uncertainty : 0.51 °C to 0.87 °C
Calibration by comparison
Comparison furnace
Approved on 19 March 2012
Institute service identifier : DMDM/T04-5
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 600 °C to 1000 °C
Base-metal thermocouple
Absolute expanded uncertainty : 0.87 °C to 1.5 °C
Calibration by comparison
Comparison furnace
Approved on 19 March 2012
Institute service identifier : DMDM/T04-6
Items for defining ITS-90 , Temperature : -38.8344 °C
Long SPRT in Mercury triple point
Absolute expanded uncertainty : 1 mK
Direct comparison
Ethanol bath
Approved on 17 January 2013
Institute service identifier : DMDM/T01-2
DC resistance , DC resistance standards and sources: high values : 1.00E7 Ω to 1.00E9 Ω
Fixed resistor, resistance box
Relative expanded uncertainty : 6.0E1 µΩ/Ω to 5.0E3 µΩ/Ω
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Comparison by means of a binary voltage divider bridge
Voltage : 90.9 V
Fixed resistor in oil or air bath, temperature: 23 °C
Approved on 06 January 2015
Institute service identifier : DMDM/121

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