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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
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
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 100 °C to 250 °C
Thermistors and other resistive thermometer
Absolute expanded uncertainty : 2.0E1 mK
Comparison
Stirred liquid bath : silicon oil
Approved on 03 November 2009
Institute service identifier : BIM/4.3
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 100 °C to 250 °C
Liquid-in-glass thermometer
Absolute expanded uncertainty : 2.5E1 mK
Comparison
Stirred liquid bath : silicon oil
Approved on 03 November 2009
Institute service identifier : BIM/7.4
Hygrometers , Humidity : 50 %rh to 90 %rh
Relative humidity sensors
Absolute expanded uncertainty : 2 %rh
Comparison in a climatic chamber
Air temperature : 20 °C to 50 °C
Approved on 17 August 2017
Institute service identifier : BIM/3.3.1
Items for disseminating ITS-90 and PLTS 2000 , Temperature : 250 °C to 650 °C
IPRT
Absolute expanded uncertainty : 0.1 °C to 0.6 °C
Comparison
Furnace : metal block
Approved on 03 November 2009
Institute service identifier : BIM/3.4
Hygrometers , Humidity : 50 %rh to 90 %rh
Other hygrometer
Absolute expanded uncertainty : 2.2 %rh
Comparison in a climatic chamber
Air temperature : 1 °C to 20 °C
Approved on 17 August 2017
Institute service identifier : BIM/3.3.1
Hygrometers , Humidity : 30 %rh to 50 %rh
Other hygrometer
Absolute expanded uncertainty : 1.8 %rh
Comparison in a climatic chamber
Air temperature : 1 °C to 20 °C
Approved on 17 August 2017
Institute service identifier : BIM/3.3.1
Items for defining ITS-90 , Temperature : 234.3156 °C
Capsule-type SPRT
Absolute expanded uncertainty : 0.5 mK
Calibration at mercury triple point
Mercury apparatus
Approved on 27 March 2014
Institute service identifier : BIM/2.1
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
Impedance (up to the MHz range) , Capacitance for dielectric capacitors : 0.01 µF to 1 µF
Fixed capacitor
Relative expanded uncertainty : 2.0E1 µF/F to 5.0E1 µF/F
{"row_1":{"col_1":"","col_2":"Expanded uncertainty in µF/F"},"row_2":{"col_1":"10 nF to 100 nF","col_2":"20 to 30"},"row_3":{"col_1":"200 nF to 1 µF","col_2":"50"}}
Comparison with capacitance bridge
Frequency : 1 kHz
Uncertainty is not varying linearly within the range.
Approved on 07 February 2019
Institute service identifier : 25
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

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