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AC voltage, current, and power (15)
 AC power and energy: single phase (frequency <= 400 Hz, active power) (2)
 AC voltage up to 1000 V: sources (1)
 AC voltage up to 1000 V: meters (1)
 AC current up to 100 A: sources (1)
 AC current up to 100 A: meters (1)
 AC-DC current transfer: AC-DC transfer difference (1)
 AC power and energy: single phase (frequency <= 400 Hz, reactive power) (1)
 AC power and energy: single phase (frequency <= 400 Hz, apparent power) (1)
 AC power and energy: single phase (frequency <= 400 Hz, active energy) (1)
 AC power and energy: single phase (frequency <= 400 Hz, reactive energy) (1)
 AC power and energy: single phase (frequency <= 400 Hz, apparent energy) (1)
 AC-DC voltage transfer: AC-DC transfer difference at low voltages (typically below or equal to 0.5 V) (1)
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 Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Electricity and Magnetism for Mexico (.PDF file)
AC-DC voltage transfer: AC-DC transfer difference at low voltages (typically below or equal to 0.5 V). AC-DC transfer standard, 2 mV to 500 mV
Relative expanded uncertainty (k = 2, level of confidence 95%) in µV/V: 4 to 400
Direct comparison
Frequency: 10 Hz to 1 MHz
Approved on 28 April 2011
Internal NMI service identifier: CENAM/E010-003-01-a
Uncertainty table
 AC-DC voltage transfer: AC-DC transfer difference at medium voltages (typically above 0.5 V to 5 V). AC-DC transfer standard, 1 V to 5 V Relative expanded uncertainty (k = 2, level of confidence 95%) in µV/V: 4 to 42 Direct comparison Frequency: 10 Hz to 1 MHz Approved on 28 April 2011 Internal NMI service identifier: CENAM/E010-003-02-a Uncertainty table
 AC-DC voltage transfer: AC-DC transfer difference at higher voltages (typically above 5 V). AC-DC transfer standard, 10 V to 1000 V Relative expanded uncertainty (k = 2, level of confidence 95%) in µV/V: 6 to 103 Direct comparison Frequency: 10 Hz to 1 MHz Approved on 28 April 2011 Internal NMI service identifier: CENAM/E010-003-03-a Uncertainty table
 AC voltage up to 1000 V: sources. Multifunction calibrator, 0.002 V to 1000 V Relative expanded uncertainty (k = 2, level of confidence 95%) in µV/V: 12 to 600 Comparison vs AC-DC transfer standard Frequency: 10 Hz to 1 MHz Approved on 28 April 2011 Internal NMI service identifier: CENAM/E010-001-01-a Uncertainty table
 AC voltage up to 1000 V: meters. Multimeter, 0.002 V to 1000 V Relative expanded uncertainty (k = 2, level of confidence 95%) in µV/V: 12 to 600 Direct comparison Frequency: 10 Hz to 1 MHz Approved on 28 April 2011 Internal NMI service identifier: CENAM/E010-001-02-a Uncertainty table
 AC-DC current transfer: AC-DC transfer difference. Thermal converter plus shunt, 0.001 A to 20 A Relative expanded uncertainty (k = 2, level of confidence 95%) in µA/A: 30 to 115 Direct comparison Frequency: 40 Hz to 5 kHz Approved on 28 April 2011 Internal NMI service identifier: CENAM/E010-006-01-a Uncertainty table
 AC current up to 100 A: sources. Multifunction calibrator, 0.001 A to 20 A Relative expanded uncertainty (k = 2, level of confidence 95%) in µA/A: 35 to 120 Direct comparison Frequency: 40 Hz to 5 kHz Approved on 28 April 2011 Internal NMI service identifier: CENAM/E010-004-01-a Uncertainty table
 AC current up to 100 A: meters. Multimeter, 0.001 A to 20 A Relative expanded uncertainty (k = 2, level of confidence 95%) in µA/A: 35 to 800 Direct measurement using a characterized calibrator Frequency: 40 Hz to 5 kHz Approved on 28 April 2011 Internal NMI service identifier: CENAM/E003-002-52-a Uncertainty table
 AC power and energy: single phase (frequency <= 400 Hz, active power). Multifunction calibrators, 60 W to 2.4E+03 W Relative expanded uncertainty (k = 2, level of confidence 95%) in µW/VA: 100 Direct comparison Voltage: 120 V, 240 V Current: 1 A, 10 A Power factor: 1 to 0.5, inductive or capactive Frequency: 60 Hz Approved on 05 January 2012 Internal NMI service identifier: CENAM/E012-001B-CC
 AC power and energy: single phase (frequency <= 400 Hz, active power). Power meter, 0 W to 6E+04 W Relative expanded uncertainty (k = 2, level of confidence 95%) in µW/VA: 20 to 30 Direct comparison Voltage: 120 V, 240 V, 480 V, 600 V Current: 0.25 A to 100 A Power factor: 1 to 0, inductive or capacitive Frequency: 60 Hz Approved on 05 January 2012 Internal NMI service identifier: CENAM/E012-001-01 Uncertainty table
 AC power and energy: single phase (frequency <= 400 Hz, reactive power). VAR meter, 0 var to 6E+04 var Relative expanded uncertainty (k = 2, level of confidence 95%) in µvar/VA: 20 to 30 Direct comparison Voltage: 120 V, 240 V, 480 V, 600 V Current: 0.25 A to 100 A Power factor: 1 to 0, inductive or capacitive Frequency: 60 Hz Approved on 05 January 2012 Internal NMI service identifier: CENAM/E012-001-02 Uncertainty table
 AC power and energy: single phase (frequency <= 400 Hz, apparent power). VA meter, 30 VA to 6E+04 VA Relative expanded uncertainty (k = 2, level of confidence 95%) in µVA/VA: 20 to 30 Direct comparison Voltage: 120 V, 240 V, 480 V, 600 V Current: 0.25 A to 100 A Power factor: 1 to 0, inductive or capacitive Frequency: 60 Hz Approved on 05 January 2012 Internal NMI service identifier: CENAM/E012-001-03 Uncertainty table
 AC power and energy: single phase (frequency <= 400 Hz, active energy). Watt-hour meter, 0 J to 7.2E+06 J Relative expanded uncertainty (k = 2, level of confidence 95%) in µJ/VAs: 20 to 30 Direct comparison Voltage: 120 V, 240 V, 480 V, 600 V Current: 0.25 A to 100 A Power factor: 1 to 0, inductive or capacitive Frequency: 60 Hz Measurement time: 120 s Approved on 05 January 2012 Internal NMI service identifier: CENAM/E012-001-04 Uncertainty table
 AC power and energy: single phase (frequency <= 400 Hz, reactive energy). VAR-hour meter, 0 vars to 7.2E+06 vars Relative expanded uncertainty (k = 2, level of confidence 95%) in µvars/VAs: 20 to 30 Direct comparison Voltage: 120 V, 240 V, 480 V, 600 V Current: 0.25 A to 100 A Power factor: 1 to 0, inductive or capacitive Frequency: 60 Hz Measurement time: 120 s Approved on 05 January 2012 Internal NMI service identifier: CENAM/E012-001-05 Uncertainty table
 AC power and energy: single phase (frequency <= 400 Hz, apparent energy). VA-hour meter, 3.6E+03 VAs to 7.2E+06 VAs Relative expanded uncertainty (k = 2, level of confidence 95%) in µVAs/VAs: 20 to 30 Direct comparison Voltage: 120 V, 240 V, 480 V, 600 V Current: 0.25 A to 100 A Power factor: 1 to 0, inductive or capacitive Frequency: 60 Hz Measurement time: 120 s Approved on 05 January 2012 Internal NMI service identifier: CENAM/E012-001-06 Uncertainty table