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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)
Bulgaria, BIM (Bulgarian Institute of Metrology)
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 6.7 to 7.6 4.0E-3
  • Mechanism for measurement service delivery : Calibration services, value assignment for proficiency testing scheme samples
  • Approved on 25 August 2020
  • Institute service identifier : 1.6.b-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 1.5 to 1.9 1.0E-2
  • Mechanism for measurement service delivery : Calibration services, value assignment for proficiency testing scheme samples
  • Approved on 25 August 2020
  • Institute service identifier : 1.6.a-1
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 9.8 to 10.2 8.0E-3
  • Mechanism for measurement service delivery : Calibration services, value assignment for proficiency testing scheme samples
  • Approved on 25 August 2020
  • Institute service identifier : 1.6.c-2
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 3.6 to 4.2 5.0E-3
  • Mechanism for measurement service delivery : Calibration services, value assignment for proficiency testing scheme samples
  • Approved on 25 August 2020
  • Institute service identifier : 1.6.a-2
Matrix or material Dissemination range of measurement capability Range of certified values in reference materials
pH in Absolute expanded uncertainty in pH in Absolute expanded uncertainty in
aqueous pH buffer solution 9 to 9.4 4.0E-3
  • Mechanism for measurement service delivery : Calibration services, value assignment for proficiency testing scheme samples
  • Approved on 25 August 2020
  • Institute service identifier : 1.6.c-1
Matrix or material Analyte or component Dissemination range of measurement capability Range of certified values in reference materials
Mass fraction in mg/kg Relative expanded uncertainty in % Mass fraction in
blood serum copper 1 to 50 4.2 to 5
  • Mechanism for measurement service delivery : Reference measurement service and reference value assignment for PT
  • Approved on 15 October 2019
  • Institute service identifier : CHM 10
Linear vibration , Acceleration : 1 m/s2 to 1000 m/s2
Acceleration measuring instrument
Relative expanded uncertainty : 2 %
Comparison, ISO 16063-21
Frequency : 6.3 kHz to 10 kHz
Approved on 18 October 2005
Measurement microphones , Pressure sensitivity level
Measurement microphone type LS1P
Absolute expanded uncertainty : 0.18 dB
Pressure sequential comparison
Frequency : 5 kHz to 10 kHz
Approved on 18 October 2005
Sound measuring instruments , Free-field response level
Sound level meter
Absolute expanded uncertainty : 0.4 dB
Sequential comparison
Frequency : 63 Hz to 4 kHz
Approved on 18 October 2005
Spectral properties of materials , Transmittance, regular, spectral : 0.1 to 1
Spectrally-neutral material
Relative expanded uncertainty : 0.65 %
Direct measuring with standard spectrophotometer
Wavelength : 400 nm to 700 nm
Bandwidth : 0.5 nm to 5 nm
Approved on 21 October 2001
DC resistance , DC resistance standards and sources: multiple ranges : 1 Ω to 1.00E8 Ω
Multifunction calibrator: R
Relative expanded uncertainty : 1 µΩ/Ω to 5.5E1 µΩ/Ω
{"row_1":{"col_1":"","col_2":"Expanded uncertainty"},"row_2":{"col_1":"1 ohm","col_2":"1"},"row_3":{"col_1":"1.9 ohm","col_2":"1"},"row_4":{"col_1":"10 ohm","col_2":"1"},"row_5":{"col_1":"19 ohm","col_2":"1"},"row_6":{"col_1":"100 ohm","col_2":"1"},"row_7":{"col_1":"190 ohm","col_2":"1"},"row_8":{"col_1":"1 kohm","col_2":"1.5"},"row_9":{"col_1":"1.9 ohm","col_2":"1.5"},"row_10":{"col_1":"10 kohm","col_2":"2.1"},"row_11":{"col_1":"19 kohm","col_2":"2.1"},"row_12":{"col_1":"100 kohm","col_2":"2.4"},"row_13":{"col_1":"190 kohm","col_2":"2.4"},"row_14":{"col_1":"1 Mohm","col_2":"4.5"},"row_15":{"col_1":"19 Mohm","col_2":"4.5"},"row_16":{"col_1":"10 Mohm","col_2":"6.0"},"row_17":{"col_1":"19 Mohm","col_2":"6.0"},"row_18":{"col_1":"100 Mohm","col_2":"55"}}
The expanded uncertainties given in this table are expressed in µΩ/Ω
Comparison by means of current comparator bridge and automated high resistance bridge
R : decade values and divisible by 1.9
Approved on 06 August 2013
Institute service identifier : 79
High voltage and current , High AC current: current transformer phase displacement : -20 mrad to 20 mrad
Current transformer
Absolute expanded uncertainty : 9.0E-2 mrad
Comparison with standard current transformer
Primary : 0.1 A to 5 A
Secondary : 1 A or 5 A
Frequency : 50 Hz
Approved on 06 August 2013
Institute service identifier : 68
DC resistance , DC resistance meters: low values : 1.00E-4 Ω to 1 Ω
Micro-ohmmeter, multimeter: R
Relative expanded uncertainty : 1.2E2 µΩ/Ω to 3 µΩ/Ω
{"row_1":{"col_1":"","col_2":"Expanded uncertainty"},"row_2":{"col_1":"0.0001 ohm","col_2":"120"},"row_3":{"col_1":"0.001 ohm","col_2":"70"},"row_4":{"col_1":"0.01 ohm","col_2":"70"},"row_5":{"col_1":"0.1 ohm","col_2":"70"},"row_6":{"col_1":"1 ohm","col_2":"3.0"}}
The expanded uncertainties given in this table are expressed in µΩ/Ω
Direct measurement
R : decade values
Approved on 06 August 2013
Institute service identifier : 80
High voltage and current , High AC voltage: voltage transformer ratio error : -0.2 % to 0.2 %
Voltage transformer
Absolute expanded uncertainty : 9.0E-3 %
Comparison with reference standard
Primary voltage : 2 kV to 100 kV
Secondary voltage : 15 V to 120 V
Frequency : 50 Hz
Approved on 06 August 2013
Institute service identifier : 95
DC current (up to 100 A) , DC current meters: intermediate values : 1.00E-4 A to 2 A
Multimeter, multifunction transfer standard
Relative expanded uncertainty : 8 µA/A to 5.3E1 µA/A
{"row_1":{"col_1":"","col_2":"Expanded uncertainty"},"row_2":{"col_1":"100 µA to 200 µA","col_2":"8"},"row_3":{"col_1":"200 µA to 2 mA","col_2":"13 to 11"},"row_4":{"col_1":"2 mA to 20 mA","col_2":"13 to 8"},"row_5":{"col_1":"20 mA to 200 mA","col_2":"16 to 10"},"row_6":{"col_1":"200 mA to 2 A","col_2":"25 to 53"}}
The expanded uncertainties given in this table are expressed in µA/A
Direct measurement with calibrator
Approved on 06 August 2013
Institute service identifier : 16
High voltage and current , High DC voltage: average value : 0.2 kV to 100 kV
DC voltage measuring system, DC voltage source
Absolute expanded uncertainty : 0.1 kV to 0 kV
Comparison with reference measuring system
Approved on 07 February 2019
Institute service identifier : 63
Pressure , Negative gauge pressure : 1.00E4 Pa to 1.00E5 Pa
Pressure balance
Absolute expanded uncertainty
5E-04p

p pressure in Pa

The uncertainty is expressed in Pa

Gas medium
Uncertainty values range from 5 Pa to 50 Pa
Approved on 11 October 2005
Institute service identifier : EUR-BIM-M-043
Pressure , Absolute pressure : 2.00E4 Pa to 7.00E6 Pa
Pressure balance
Absolute expanded uncertainty
1E-04p

p pressure in Pa

The uncertainty is expressed in Pa

Gas medium
Uncertainty values range from 2 Pa to 7E+02 Pa
Approved on 11 October 2005
Institute service identifier : EUR-BIM-M-041
Frequency , Frequency : 1 MHz to 100 MHz
General frequency source
Relative expanded uncertainty : 2.0E-9 Hz/Hz
Direct frequency measurement
Averaging time : 100 s
Approved on 18 November 2009
Institute service identifier : BIM/2.2.1.3
Frequency , Frequency : 10 MHz
Local frequency standard
Relative expanded uncertainty : 6.0E-13 Hz/Hz
Frequency comparator
Averaging time : 1 day
Approved on 18 November 2009
Institute service identifier : BIM/2.1.1.4

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