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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)
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
CMC ID :
EURAMET-AUV-BG-0000056Q-1
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
CMC ID :
EURAMET-M-BG-000005MY-1
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
CMC ID :
EURAMET-M-BG-000005MV-1
Frequency ,
Frequency
:
0.1 GHz to 20 GHz
Frequency counter
Relative expanded uncertainty
:
7.0E-9 Hz/Hz
Frequency source
Averaging time : 10 s
Approved on 18 November 2009
Institute service identifier : BIM/2.3.1.4
CMC ID :
EURAMET-TF-BG-00000B2P-1
Hygrometers ,
Humidity
:
10 %rh to 30 %rh
Other hygrometer
Absolute expanded uncertainty
:
1.4 %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
CMC ID :
EURAMET-T-BG-00000BA1-1
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
CMC ID :
EURAMET-T-BG-00000BA0-1
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
CMC ID :
EURAMET-T-BG-00000B9Z-1
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
CMC ID :
EURAMET-AUV-BG-0000056Y-1
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
CMC ID :
EURAMET-TF-BG-00000B2K-1
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
CMC ID :
EURAMET-TF-BG-00000B2H-1
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
CMC ID :
EURAMET-T-BG-00000B93-1
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
CMC ID :
EURAMET-T-BG-00000B9D-1
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
CMC ID :
EURAMET-T-BG-00000B9X-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
CMC ID :
EURAMET-T-BG-00000B90-1
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
CMC ID :
EURAMET-T-BG-00000B9K-1
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
CMC ID :
EURAMET-EM-BG-00000DTQ-1
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
CMC ID :
EURAMET-EM-BG-00000DTM-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
Uncertainty table
{"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"}}
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
CMC ID :
EURAMET-EM-BG-00000DTV-1
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
Uncertainty table
{"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
CMC ID :
EURAMET-EM-BG-00000DU3-1
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
Uncertainty table
{"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"}}
Direct measurement
R : decade values
Approved on 06 August 2013
Institute service identifier : 80
CMC ID :
EURAMET-EM-BG-00000DTW-1
