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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 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