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AC voltage, current, and power (20)
 AC voltage ratio: real component (3)
 AC voltage ratio: imaginary component (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: AC-DC transfer difference at medium voltages (1)
 AC current: AC-DC transfer difference (1)
 AC voltage up to 1100 V: meters (1)
 AC voltage: AC-DC transfer difference at low voltages (1)
 AC voltage: AC-DC transfer difference at higher voltages (1)
 AC power and energy: single phase (frequency below or equal 400 Hz), active power (1)
 AC power and energy: single phase (frequency below or equal 400 Hz), reactive power (1)
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 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 low voltages. 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 voltages. 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 voltages. 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 below or equal 400 Hz), active power. Wattmeter, 0 kW to 130 kW Relative expanded uncertainty (k = 2, level of confidence 95 %) in µW/VA: 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 below or equal 400 Hz), reactive power. Wattmeter, 0 kvar to 130 kvar Relative expanded uncertainty (k = 2, level of confidence 95 %) in µvar/VA: 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: 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: 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: 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 analysers, flicker meters, wattmeters, 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 analysers, flicker meters, wattmeters, 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