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AC power and energy: single phase (frequency <= 400 Hz, apparent energy) (1)
AC current up to 100 A: meters
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Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Electricity and Magnetism for Mexico (.PDF file)
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