Results for: Central Office of Metrology
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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)
Estonia, AS METROSERT (Central Office of Metrology)
Mass , Mass : 1 kg to 5 kg
Mass standard
Absolute expanded uncertainty : 0.1 mg to 1.5 mg
Comparison in air
Temperature : 18 °C to 23 °C
Relative humidity : 40 % to 60 %
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 24 October 2017
Institute service identifier : AS METROSERT/210340
AC current , AC current up to 100 A: meters : 0.01 A to 10 A
AC ammeter, multimeter
Relative expanded uncertainty : 3.4E1 µA/A to 1.2E2 µA/A
{"row_1":{"col_1":"","col_2":"10 Hz","col_3":"53 Hz","col_4":"300 Hz","col_5":"1 kHz","col_6":"5 kHz","col_7":"10 kHz"},"row_2":{"col_1":"10 mA","col_2":"39","col_3":"34","col_4":"34","col_5":"34","col_6":"46","col_7":"46"},"row_3":{"col_1":"100 mA","col_2":"38","col_3":"37","col_4":"36","col_5":"36","col_6":"42","col_7":"42"},"row_4":{"col_1":"1 A","col_2":"38","col_3":"37","col_4":"36","col_5":"36","col_6":"42","col_7":"59"},"row_5":{"col_1":"5 A","col_2":"70","col_3":"70","col_4":"67","col_5":"67","col_6":"93","col_7":"120"},"row_6":{"col_1":"10 A","col_2":"70","col_3":"67","col_4":"67","col_5":"67","col_6":"93","col_7":"120"}}
The uncertainties in the table are expressed in µA/A.
Characterised AC current source
Frequency : 10 Hz to 10 kHz
Approved on 07 February 2019
Institute service identifier : 202050
DC resistance , DC resistance standards and sources: low values : 0.1 mΩ to 1000 mΩ
Fixed resistor
Relative expanded uncertainty : 1 µΩ/Ω to 1.0E2 µΩ/Ω
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µΩ/Ω)"},"row_2":{"col_1":"0.0001 Ω","col_2":"100"},"row_3":{"col_1":"0.001 Ω","col_2":"5"},"row_4":{"col_1":"0.01 Ω","col_2":"2"},"row_5":{"col_1":"0.1 Ω","col_2":"1"},"row_6":{"col_1":"1 Ω","col_2":"1"}}
DCC bridge, range extender
Oil temperature : 20 °C to 25 °C
Measurement current : 30 mA to 100 A
Approved on 07 February 2019
Institute service identifier : 206120, 206100
DC voltage (up to 1100 V) , DC voltage sources: intermediate values : 10 V to 1000 V
DC voltage source, multifunction calibrator
Absolute expanded uncertainty : 1.2E-2 mV to 4 mV
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µV/V)"},"row_2":{"col_1":"0 mV to 100 mV","col_2":"0.1 + 5<I>U</I>"},"row_3":{"col_1":"100 mV to 1 V","col_2":"0.5 + 1<I>U</I>"},"row_4":{"col_1":"1 V to 10 V","col_2":"2 + 1<I>U</I>"},"row_5":{"col_1":"10 V to 100 V","col_2":"3<I>U</I>"},"row_6":{"col_1":"100 V to 1000 V","col_2":"4<I>U</I>"}}
U is expressed in volt. The expanded uncertainty is given in µV.
Voltage ratio measurement
Approved on 07 February 2019
Institute service identifier : 202010, 202050
Linear dimensions , Line standards : 1.00E-3 m to 2 m
Machinist scale, line spacing, L
Absolute expanded uncertainty : 6.0E-2 mm to 9.0E-2 mm
0.06 mm + 15E-06 L
Tape bench and comparison to laser interferometer
Material : steel
Approved on 14 September 2018
Institute service identifier : 212250
Mass , Mass : 1 mg to 100 mg
Mass standard
Absolute expanded uncertainty : 2 µg to 4 µg
Comparison in air
Temperature : 18 °C to 23 °C
Relative humidity : 40 % to 60 %
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 24 October 2017
Institute service identifier : AS METROSERT/210284
Mass , Mass : 1 g to 10 g
Mass standard
Absolute expanded uncertainty : 3 µg to 6 µg
Comparison in air
Temperature : 18 °C to 23 °C
Relative humidity : 40 % to 60 %
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 24 October 2017
Institute service identifier : AS METROSERT/210284
DC voltage (up to 1100 V) , DC voltage sources : 1 V to 10 V
Solid state voltage standard, standard cell
Relative expanded uncertainty : 1 µV/V
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µV/V)"},"row_2":{"col_1":"10 V","col_2":"1"},"row_3":{"col_1":"1.018 V","col_2":"1"},"row_4":{"col_1":"1 V","col_2":"1"}}
Comparison with group of solid state voltage standards
Nominal value : 1 V, 1.018 V, 10 V
Approved on 07 February 2019
Institute service identifier : 202010
DC resistance , DC resistance standards and sources: high values : 10 MΩ to 1.00E4 MΩ
Fixed resistor
Relative expanded uncertainty : 1.2E1 µΩ/Ω to 2.5E2 µΩ/Ω
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µΩ/Ω)"},"row_2":{"col_1":"10 MΩ","col_2":"12"},"row_3":{"col_1":"100 MΩ","col_2":"19"},"row_4":{"col_1":"1 GΩ","col_2":"40"},"row_5":{"col_1":"10 GΩ","col_2":"250"}}
Series-parallel build-up resistors and substitution measurement
Air temperature : 20 °C to 25 °C
Approved on 07 February 2019
Institute service identifier : 206120
DC voltage (up to 1100 V) , DC voltage sources: low values : 1.00E-3 V to 10 V
DC voltage source, multifunction calibrator
Absolute expanded uncertainty : 0.1 µV to 1.2E1 µV
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µV/V)"},"row_2":{"col_1":"0 mV to 100 mV","col_2":"0.1 + 5<I>U</I>"},"row_3":{"col_1":"100 mV to 1 V","col_2":"0.5 + 1<I>U</I>"},"row_4":{"col_1":"1 V to 10 V","col_2":"2 + 1<I>U</I>"},"row_5":{"col_1":"10 V to 100 V","col_2":"3<I>U</I>"},"row_6":{"col_1":"100 V to 1000 V","col_2":"4<I>U</I>"}}
U is expressed in volt. The expanded uncertainty is given in µV.
Voltage ratio measurement
Approved on 07 February 2019
Institute service identifier : 202010, 202050
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length, L
Absolute expanded uncertainty : 5.4E-2 µm to 0.11 µm
Q[0.054 µm, 0.91E-06 L]
Mechanical comparison
Material : steel, tungsten carbide, zirconia ceramic
Approved on 14 September 2018
Institute service identifier : 212610, 212611
AC voltage (up to the MHz range) , AC voltage up to 1000 V: sources : 0.1 V to 1000 V
Multifunction calibrator
Relative expanded uncertainty : 2.0E-2 mV/V to 0.79 mV/V
{"row_1":{"col_1":"","col_2":"10 Hz","col_3":"55 Hz","col_4":"110 Hz","col_5":"300 Hz","col_6":"1 kHz","col_7":"10 kHz","col_8":"30 kHz","col_9":"50 kHz","col_10":"80 kHz","col_11":"100 kHz","col_12":"300 kHz","col_13":"500 kHz","col_14":"700 kHz","col_15":"1 MHz"},"row_2":{"col_1":"100 mV","col_2":"0.06","col_3":"0.03","col_4":"0.03","col_5":"0.03","col_6":"0.03","col_7":"0.03","col_8":"0.04","col_9":"0.03","col_10":"0.03","col_11":"0.03","col_12":"0.11","col_13":"0.21","col_14":"0.39","col_15":"0.79"},"row_3":{"col_1":"1 V","col_2":"0.04","col_3":"0.02","col_4":"0.02","col_5":"0.02","col_6":"0.02","col_7":"0.02","col_8":"0.02","col_9":"0.02","col_10":"0.02","col_11":"0.02","col_12":"0.16","col_13":"0.26","col_14":"0.42","col_15":"0.42"},"row_4":{"col_1":"10 V"}}
The uncertainties in the table are expressed in mV/V.
AC/DC transfer standard
Frequency : 10 Hz to 1 MHz
Approved on 07 February 2019
Institute service identifier : 202050
DC current (up to 100 A) , DC current meters: intermediate values : 1 mA to 1.00E4 mA
Multimeter
Relative expanded uncertainty : 1.0E1 µA/A to 2.0E1 µA/A
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µA/A)"},"row_2":{"col_1":"1 mA","col_2":"10"},"row_3":{"col_1":"10 mA","col_2":"10"},"row_4":{"col_1":"100 mA","col_2":"10"},"row_5":{"col_1":"1 A","col_2":"12"},"row_6":{"col_1":"10 A","col_2":"20"}}
DC current source
Approved on 07 February 2019
Institute service identifier : 202050
Mass , Mass : 0.1 kg to 1 kg
Mass standard
Absolute expanded uncertainty : 1.5E1 µg to 1.0E2 µg
Comparison in air
Temperature : 18 °C to 23 °C
Relative humidity : 40 % to 60 %
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 24 October 2017
Institute service identifier : AS METROSERT/210284
DC voltage (up to 1100 V) , DC voltage meters: intermediate values : 1.00E-3 V to 1000 V
DC voltmeter, multimeter
Absolute expanded uncertainty : 1.0E-4 mV to 4 mV
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µV/V)"},"row_2":{"col_1":"0 mV to 100 mV","col_2":"0.1 + 5<I>U</I>"},"row_3":{"col_1":"100 mV to 1 V","col_2":"0.5 + 1<I>U</I>"},"row_4":{"col_1":"1 V to 10 V","col_2":"2 + 1<I>U</I>"},"row_5":{"col_1":"10 V to 100 V","col_2":"3<I>U</I>"},"row_6":{"col_1":"100 V to 1000 V","col_2":"4<I>U</I>"}}
U is expressed in volt. The expanded uncertainty is given in µV.
Voltage ratio measurement
Approved on 07 February 2019
Institute service identifier : 211302
DC current (up to 100 A) , DC current sources: intermediate values : 1 mA to 1.00E4 mA
Current generator, multifunction calibrator
Relative expanded uncertainty : 5 µA/A to 8 µA/A
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µA/A)"},"row_2":{"col_1":"1 mA","col_2":"5"},"row_3":{"col_1":"10 mA","col_2":"8"},"row_4":{"col_1":"100 mA","col_2":"8"},"row_5":{"col_1":"1 A","col_2":"8"},"row_6":{"col_1":"10 A","col_2":"8"}}
Voltage drop across a resistor
Approved on 07 February 2019
Institute service identifier : 202050
Linear dimensions , Line standards : 1.00E-3 m to 120 m
Engineer or surveyor tape, line spacing, L
Absolute expanded uncertainty : 6.0E-2 mm to 1.9 mm
0.06 mm + 15E-06 L
Tape bench and comparison to laser interferometer
Material : steel
Approved on 14 September 2018
Institute service identifier : 212270; 212290; 212300
Mass , Mass : 10 g to 100 g
Mass standard
Absolute expanded uncertainty : 6 µg to 1.5E1 µg
Comparison in air
Temperature : 18 °C to 23 °C
Relative humidity : 40 % to 60 %
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 24 October 2017
Institute service identifier : AS METROSERT/210284
Mass , Mass : 5 kg to 10 kg
Mass standard
Absolute expanded uncertainty : 1.5 mg to 2 mg
Comparison in air
Temperature : 18 °C to 23 °C
Relative humidity : 40 % to 60 %
Uncertainty scales with measurand level The volume of the mass standards is known
Approved on 24 October 2017
Institute service identifier : AS METROSERT/210340
AC voltage (up to the MHz range) , AC voltage up to 1000 V: meters : 0.1 V to 1000 V
AC voltmeter, multimeter
Relative expanded uncertainty : 2.0E-2 mV/V to 0.79 mV/V
{"row_1":{"col_1":"","col_2":"10 Hz","col_3":"55 Hz","col_4":"110 Hz","col_5":"300 Hz","col_6":"1 kHz","col_7":"10 kHz","col_8":"30 kHz","col_9":"50 kHz","col_10":"80 kHz","col_11":"100 kHz","col_12":"300 kHz","col_13":"500 kHz","col_14":"700 kHz","col_15":"1 MHz"},"row_2":{"col_1":"100 mV","col_2":"0.06","col_3":"0.03","col_4":"0.03","col_5":"0.03","col_6":"0.03","col_7":"0.03","col_8":"0.04","col_9":"0.03","col_10":"0.03","col_11":"0.03","col_12":"0.11","col_13":"0.21","col_14":"0.39","col_15":"0.79"},"row_3":{"col_1":"1 V","col_2":"0.04","col_3":"0.02","col_4":"0.02","col_5":"0.02","col_6":"0.02","col_7":"0.02","col_8":"0.02","col_9":"0.02","col_10":"0.02","col_11":"0.02","col_12":"0.16","col_13":"0.26","col_14":"0.42","col_15":"0.42"},"row_4":{"col_1":"10 V"}}
The uncertainties in the table are expressed in mV/V.
AC/DC transfer standard
Frequency : 10 Hz to 1 MHz
Approved on 07 February 2019
Institute service identifier : 202050

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