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CMCs General Physics (20)
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Impedance up to the MHz range
AC voltage, current, and power (20)
AC voltage ratio: real component (3)
AC voltage ratio: imaginary component (3)
AC voltage: AC (3)
AC power and energy: single phase (frequency > 400 Hz), active power (3)
AC voltage up to 1000 V: meters (2)
AC current up to 100 A: meters (2)
AC voltage up to 1100 V: meters (1)
AC power and energy: single phase (frequency <= 400 Hz), active power (1)
AC power and energy: single phase (frequency <= 400 Hz), reactive power (1)
AC current: AC (1)
IONIZING RADIATION
Ambient dose equivalent rate
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Your query 'United Kingdom' produced 20 results New search

 
United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Electricity and Magnetism for United Kingdom (.PDF file)
AC voltage ratio: real component. Inductive voltage divider, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 5.8E-08 to 2.1E-07
Comparison with reference divider
Frequency: 40 Hz to 5 kHz
Maximum RMS voltage: 4 V to 30 V
Approved on 06 August 2013
Internal NMI service identifier: 190
Uncertainty table
 
AC voltage ratio: real component. Inductive voltage divider, 0 to 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 2.1E-07 to 1.5E-05
Comparison with reference divider
Frequency: 5 kHz to 120 kHz
Maximum RMS voltage: 30 V
Approved on 07 February 2019
Internal NMI service identifier: 202
Uncertainty table
 
AC voltage ratio: real component. Voltage transformer, 1
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 50E-06
IVD and mutual inductance bridge
Frequency: 50 Hz
Maximum error: 0.002
Approved on 06 August 2013
Internal NMI service identifier: 212
 
AC voltage ratio: imaginary component. Inductive voltage divider, -0.001 to 0.001
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 6.9E-08 to 2.1E-07
Comparison with reference divider
Frequency: 40 Hz to 5 kHz
Maximum RMS voltage: 4 V to 30 V
Approved on 06 August 2013
Internal NMI service identifier: 219
Uncertainty table
 
AC voltage ratio: imaginary component. Inductive voltage divider, -0.001 to 0.001
Absolute expanded uncertainty (k = 2, level of confidence 95 %): 2.1E-07 to 1.6E-05
Comparison with reference divider
Frequency: 5 kHz to 120 kHz
Maximum RMS voltage: 30 V
Approved on 07 February 2019
Internal NMI service identifier: 231
Uncertainty table
 
AC voltage ratio: imaginary component. Voltage transformer, -2.4 mrad to 2.4 mrad
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in µrad: 30
IVD and mutual inductance bridge
Frequency: 50 Hz
Approved on 06 August 2013
Internal NMI service identifier: 241
 
AC voltage: AC/DC transfer difference at lower voltage. AC-DC transfer standard, 0.001 V to 0.5 V
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µV/V: 6 to 796
Thermal converter "digital" bridge
Frequency range: 10 Hz to 1 MHz
Approved on 06 August 2013
Internal NMI service identifier: 141
Uncertainty table
 
AC voltage: AC/DC transfer difference at higher voltage. AC-DC transfer standard, thermal converter plus range extender, 10 V to 1000 V
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µV/V: 6 to 62
Thermal converter "digital" bridge
Frequency range: 10 Hz to 1 MHz
Approved on 06 August 2013
Internal NMI service identifier: 159
Uncertainty table
 
AC voltage up to 1000 V: meters. AC voltmeter, multimeter, 0.001 V to 1000 V
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µV/V: 20
Digital sampling
Frequency: 0.05 Hz to 201 Hz
Approved on 06 August 2013
Internal NMI service identifier: 183,1
 
AC voltage up to 1000 V: meters. AC voltmeter, multimeter, 0.5 V to 1000 V
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µV/V: 7 to 86
AD-DC transfer and DC voltage
Frequency: 10 Hz to 1 MHz
Approved on 06 August 2013
Internal NMI service identifier: 183,2
Uncertainty table
 
AC voltage: AC/DC transfer difference at medium voltage. AC-DC transfer standard, thermal converter, 1 V to 5 V
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µV/V: 6 to 51
Thermal converter "digital" bridge
Frequency: 10 Hz to 1 MHz
Approved on 06 August 2013
Internal NMI service identifier: 132
Uncertainty table
 
AC current: AC/DC transfer difference. AC-DC standard plus shunt, 0.001 A to 20 A
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µA/A: 10 to 243
Thermal converter "digital" bridge
Frequency: 10 Hz to 100 kHz
Approved on 06 August 2013
Internal NMI service identifier: 242
Uncertainty table
 
AC current up to 100 A: meters. Current transducer, 5 A to 100 A
Relative expanded uncertainty (k = 2, level of confidence 95 %) in mA/A: 0.5
Comparison using 2 DVMs
Frequency: 50 Hz
Approved on 06 August 2013
Internal NMI service identifier: 276,1
 
AC power and energy: single phase (frequency . Wattmeter, 0 kW to 130 kW
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µW (VA)-1: 28 to 40
Digital sampling
Frequency: 50 Hz to 400 Hz
Voltage: 1 V to 1000 V
Current: 2 mA to 130 A
Power factor: 1 to 0, inductive or capacitive
The range given for uncertainty defines the minimum and maximum values. Minimum for zero power factor, maximum for unity power factor.
Approved on 06 August 2013
Internal NMI service identifier: 286,1
 
AC power and energy: single phase (frequency . Wattmeter, 0 % to 130 %
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µvar (VA)-1: 28 to 40
Digital sampling
Frequency: 50 Hz to 400 Hz
Voltage: 1 V to 1000 V
Current: 2 mA to 130 A
Power factor: 1 to 0, inductive or capacitive
The range given for uncertainty defines the minimum and maximum values. Maximum for zero power factor, minimum for unity power factor.
Approved on 06 August 2013
Internal NMI service identifier: 286,2
 
AC power and energy: single phase (frequency > 400 Hz), active power. Wattmeter, 0.03 W to 3000 W
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µW (VA)-1: 200
3 voltmeter method
Frequency: 400 Hz to 30 kHz
Voltage: 0.3 V to 300 V
Current: 0.1 A to 10 A
Power factor: 1
Approved on 06 August 2013
Internal NMI service identifier: 286,3
 
AC power and energy: single phase (frequency > 400 Hz), active power. Wattmeter, 0 W to 3000 W
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µW (VA)-1: 500
3 voltmeter method
Frequency: 400 Hz to 30 kHz
Voltage: 0.3 V to 300 V
Current: 0.1 A to 10 A
Power factor: 1 to 0, inductive or capacitive
Approved on 06 August 2013
Internal NMI service identifier: 286,4
 
AC power and energy: single phase (frequency > 400 Hz), active power. Wattmeter, 0 W to 3000 W
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µW (VA)-1: 1200
3 voltmeter method
Frequency: 30 kHz to 100 kHz
Voltage: 0.3 V to 300 V
Current: 0.1 A to 10 A
Power factor: 1 to 0, inductive or capacitive
Approved on 06 August 2013
Internal NMI service identifier: 286,5
 
AC voltage up to 1100 V: meters. Mains frequency harmonics analyser, flicker meter, wattmeter, 1 V to 1000 V
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µV/V: 25
Digital sampling
Frequency: single tone sinewave 50 Hz to 2 kHz
Approved on 06 August 2013
Internal NMI service identifier: 309,5
 
AC current up to 100 A: meters. Mains frequency harmonics analyser, flicker meter, wattmeter, 0.002 A to 130 A
Relative expanded uncertainty (k = 2, level of confidence 95 %) in µA/A: 30
Digital sampling
Frequency: single tone sinewave 50 Hz to 2 kHz
Maximum current limited to 20 A for mains frequency harmonics analysers and flicker meters. Upper frequency limited to 400 Hz for wattmeters.
Approved on 06 August 2013
Internal NMI service identifier: 309,6