13
CM-450
Accuracy
Refer to “Specifications” for operating conditions and temperature coefficient.
Accuracy is specified as follows: ± (a percentage of the r a fixed amount)
at 23 °C ± 5 °C (73.4 °F ± 9 °F), 0% to 75% relative humidity.
True RMS readings: Voltage is specified from 5% to 100% of the range, and AC
current is specified from 10% to 100% of the range, unless otherwise specified.
Frequency must be within the specified bandwidth for non-sinusoidal waveforms.
Crest factors are as follows:
Crest Factor < 1.75 at full scale
Crest Factor < 3.5 at half scale
AC Current
Measurement Range
Accuracy
Frequency Range
0.40 to 40.00 A
± (1.5% + 0.08 A)
50 to 60 Hz
40.0 to 400.0 A
± (1.5% + 0.8 A)
400 to 600 A
± (1.5% + 8 A)
Adjacent conductor influence < 0.05 A/A
Add 2% if the conductor is beyond the position error marks.
Multiply the fixed error amount times 2 below 10% of range.
AC Voltage
Measurement
Range
Accuracy
Frequency
Range
Input
Impedance
4.000 V
± (1.5% + 0.005 V)
50 to 500 Hz
10 MΩ // 30 pF
nom.
40.00 V
± (1.5% + 0.05 V)
400.0 V
± (1.5% + 0.5 V)
600 V
± (2.0% + 5 V)
DC Voltage
Measurement Range
Accuracy
Input Impedance
400.0 mV
± (0.3% + 0.4 mV)
1000 MΩ*
4.000 V
± (0.5% + 0.003 V)
10 MΩ
40.00 V
± (0.5% + 0.03 V)
400.0 V
± (0.5% + 0.3 V)
600 V
± (1.0% + 4 V)
* The high impedance on this range will produce significant non-zero readings
when the test leads are disconnected from a circuit.
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