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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)
Lithuania, FTMC (Center for Physical Sciences and Technology)
Frequency , Frequency : 1 Hz to 2.00E8 Hz
Frequency counter
Absolute expanded uncertainty
2.5E-07 + 7E-12F

F in Hz

The uncertainty is expressed in Hz

Direct measurement of frequency F
Averaging time : 1000 s
Approved on 18 November 2009
Institute service identifier : FTMC/12
Items for defining ITS-90 , Temperature : 232 °C to 419 °C
Long-stem Standard Platinum Resistance Thermometer (SPRT)
Absolute expanded uncertainty : 4.0E-3 °C
Calibration at fixed points
Fixed points : H2O, Sn, Zn
Approved on 17 January 2013
DC resistance , DC resistance standards and sources: multiple ranges : 10 MΩ to 100 MΩ
Multifunction calibrator
Relative expanded uncertainty : 3 µΩ/Ω to 6 µΩ/Ω
{"row_1":{"col_1":"","col_2":"Expanded uncertainty"},"row_2":{"col_1":"10 MΩ","col_2":"3"},"row_3":{"col_1":"100 MΩ","col_2":"6"}}
The expanded uncertainties given in this table are expressed in µΩ/Ω
Direct comparison
Approved on 06 August 2013
Institute service identifier : FTMC/32
DC voltage (up to 1100 V) , DC voltage meters: intermediate values : 0.1 V to 1000 V
DC voltmeter, multimeter, multifunction transfer standard
Relative expanded uncertainty : 6.8 µV/V to 2.5 µV/V
{"row_1":{"col_1":"","col_2":"Expanded uncertainty"},"row_2":{"col_1":"0.1 V","col_2":"6.8"},"row_3":{"col_1":"1 V","col_2":"3"},"row_4":{"col_1":"10 V","col_2":"1.4"},"row_5":{"col_1":"1000 V","col_2":"2.5"}}
The expanded uncertainties given in this table are expressed in µV/V
Direct measurement
Approved on 06 August 2013
Institute service identifier : FTMC/37
DC resistance , DC resistance meters: intermediate values : 1 MΩ to 1000 MΩ
Ohmmeter, multimeter, multifunction transfer standard, resistance bridge
Relative expanded uncertainty : 2 µΩ/Ω to 9 µΩ/Ω
{"row_1":{"col_1":"","col_2":"Expanded uncertainty"},"row_2":{"col_1":"1 MΩ","col_2":"2"},"row_3":{"col_1":"10 MΩ","col_2":"2"},"row_4":{"col_1":"100 MΩ","col_2":"4"},"row_5":{"col_1":"1 GΩ","col_2":"9"}}
The expanded uncertainties given in this table are expressed in µΩ/Ω
Comparison to standard resistor
Approved on 06 August 2013
Institute service identifier : FTMC/21
DC resistance , DC resistance standards and sources: low values : 0.1 Ω
Fixed resistor
Relative expanded uncertainty : 0.5 µΩ/Ω
Direct current comparator bridge
Power : 2.5 mW
Approved on 06 August 2013
Institute service identifier : FTMC/9
Frequency , Frequency : 5 MHz
Local frequency standard
Relative expanded uncertainty : 2.0E-13 Hz/Hz
Phase time measurement
Averaging time : 1 day
Approved on 18 November 2009
Institute service identifier : FTMC/7
DC voltage (up to 1100 V) , DC voltage sources: intermediate values : 10 V to 1000 V
DC voltage source, multifunction calibrator
Relative expanded uncertainty : 1 µV/V to 2 µV/V
Direct measurement
Approved on 06 August 2013
Institute service identifier : FTMC/41
Various dimensional , Hand Instruments : 0 mm to 1000 mm
Calliper: error of indicated size L
Absolute expanded uncertainty : 6.0E1 µm to 6.1E1 µm
Q[60 µm, 10E-06 L]
Comparison to gauge block
Resolution : 0.05 mm
Approved on 22 March 2005
Institute service identifier : FTMC/6
Frequency , Frequency : 10 MHz
Local frequency standard
Relative expanded uncertainty : 1.8E-12 Hz/Hz
Phase time measurement
Averaging time : 1000 s
Approved on 18 November 2009
Institute service identifier : FTMC/10
Items for defining ITS-90 , Temperature : 660.323 °C
Long-stem Standard Platinum Resistance Thermometer (SPRT)
Absolute expanded uncertainty : 6.0E-3 °C
Calibration at Aluminium freezing point
3-zone furnace
Approved on 20 May 2010
Frequency , Frequency : 100 kHz
Local frequency standard
Relative expanded uncertainty : 2.0E-13 Hz/Hz
Phase time measurement
Averaging time : 1 day
Approved on 18 November 2009
Institute service identifier : FTMC/3
DC resistance , DC resistance meters: low values : 1 Ω
Micro-ohmmeter, multimeter, multifunction transfer standard, resistance bridge
Relative expanded uncertainty : 2 µΩ/Ω
Comparison to standard resistor
Approved on 06 August 2013
Institute service identifier : FTMC/17
Frequency , Frequency : 1 Hz to 2.00E8 Hz
Rectangular pulse source
Relative expanded uncertainty : 6.7E-12 Hz/Hz
Direct measurement of frequency
Averaging time : 1000 s
Slewing rate : > 0.5 V/ns
Approved on 18 November 2009
Institute service identifier : FTMC/13
DC voltage (up to 1100 V) , DC voltage sources: low values : 0.1 V to 10 V
DC voltage source, multifunction calibrator
Relative expanded uncertainty : 2.5 µV/V to 1 µV/V
Direct measurement
Approved on 06 August 2013
Institute service identifier : FTMC/40
DC resistance , DC resistance standards and sources: intermediate values : 10 kΩ to 1000 kΩ
Fixed resistor
Relative expanded uncertainty : 0.3 µΩ/Ω to 0.6 µΩ/Ω
{"row_1":{"col_1":"","col_2":"Expanded uncertainty"},"row_2":{"col_1":"10 Ω","col_2":"0.3"},"row_3":{"col_1":"100 Ω","col_2":"0.3"},"row_4":{"col_1":"1000 Ω","col_2":"0.4"},"row_5":{"col_1":"10 kΩ, 100 kΩ","col_2":"0.3"},"row_6":{"col_1":"1 MΩ","col_2":"0.6"},"row_7":{"col_1":"10 MΩ","col_2":"1.3"},"row_8":{"col_1":"100 MΩ","col_2":"2.2"},"row_9":{"col_1":"1 GΩ","col_2":"7.1"},"row_10":{"col_1":"10 GΩ","col_2":"120"},"row_11":{"col_1":"100 GΩ","col_2":"990"},"row_12":{"col_1":"1 TΩ","col_2":"9800"}}
The expanded uncertainties given in this table are expressed in µΩ/Ω
Binary voltage divider bridge
Voltage : 5 V
Approved on 06 August 2013
Institute service identifier : FTMC/14
DC voltage (up to 1100 V) , DC voltage sources: single values : 1 V to 10 V
Solid state voltage standard
Relative expanded uncertainty : 5.0E-2 µV/V to 0.3 µV/V
{"row_1":{"col_1":"","col_2":"Expanded uncertainty / (µV/V)","col_3":"Reference Standard used in calibration"},"row_2":{"col_1":"1 V","col_2":"0.06","col_3":"Josephson array voltage standard"},"row_3":{"col_1":"1.018 V","col_2":"0.06","col_3":"Josephson array voltage standard"},"row_4":{"col_1":"10 V","col_2":"0.05","col_3":"Josephson array voltage standard"},"row_5":{"col_1":"1 V","col_2":"0.3","col_3":"Solid state voltage standard"},"row_6":{"col_1":"1.018 V","col_2":"0.3","col_3":"Solid state voltage standard"},"row_7":{"col_1":"10 V","col_2":"0.3","col_3":"Solid state voltage standard"}}
Comparison
Fixed voltage : 1 V, 1.018 V, 10 V
Approved on 06 August 2013
Institute service identifier : FTMC/1
Time scale difference , Time scale difference : -1 s to 1 s
Local clock vs UTC(FTMC)
Absolute expanded uncertainty : 2 ns
Time interval measurement
Pulse amplitude : > 1 V
Fractional part of modulo 1 second difference, integer part can be provided also
Approved on 18 November 2009
Institute service identifier : FTMC/1
Items for defining ITS-90 , Temperature : 29.7646 °C
Long-stem Standard Platinum Resistance Thermometer (SPRT)
Absolute expanded uncertainty : 6.0E-4 °C
Calibration at gallium melting point
Temperature controlled bath
Approved on 20 May 2010
DC resistance , DC resistance standards and sources: low values : 1 Ω
Fixed resistor
Relative expanded uncertainty : 0.3 µΩ/Ω
Direct current comparator bridge
Power : 1 mW
Approved on 06 August 2013
Institute service identifier : FTMC/10

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