OVERVOLTAGE CATEGORY
• Equipment of CAT is equipment for connection to circuits
in which measures are taken to limit the transient
overvoltages to an appropriate low level.
Note: Examples include protected electronic circuits.
• Equipment of CAT is energy-consuming equipment to be
supplied from the fixed installation.
Note: Examples include household, office, and laboratory
appliances.
• Equipment of CAT is equipment in fixed installations.
Note: Examples include switches in the fixed installation and
some equipment for industrial use with permanent
connection to the fixed installation.
• Equipment of CAT is for use at the origin of the installation.
Note: Examples include electricity meters and primary over-
current protection equipment.
8-2 Measurement Range and Accuracy
ACCURACY IS ±(% READING DIGITS + NUMBER OF DIGITS) OR
OTHERWISE SPECIFIED, AT 23 ±5 & LESS THAN 75% R.H.
TRUE RMS VOLTAGE & CURRENT ACCURACIES ARE SPECIFIED
FROM 5 % TO 100 % OF RANGE OR OTHERWISE SPECIFIED.
MAXIMUM CREST FACTOR <5:1 AT FULL SCALE & <10:1 AT HALF
SCALE, AND WITH FREQUENCY COMPONENTS WITHIN THE
SPECIFIED FREQUENCY BANDWIDTH FOR NON-SINUSOIDAL
WAVEFORMS
DC Voltage
—
35
—
RANGE Accuracy
500.00mV, 5.0000V, 50.000V 0.03%rdg + 2dgt
500.00V 0.05%rdg + 2dgt
1000.0V 0.1%rdg + 2dgt
NMRR: >90dB @ 50/60Hz
CMRR: >120dB @ DC, 50/60Hz, Rs=1kΩ
Input Impedance: 10MΩ, 30pF nominal (80pF nominal for 500mV
range)
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