Textron Greenlee CM-900 Manuel D'instructions page 13

Accuracy
Refer to "Specifications" for operating conditions and temperature coefficient.
Accuracy is specified as follows: ± (a percentage of the reading + a fixed amount) at
18 °C to 28 °C (64 °F to 82 °F), 0% to 80% relative humidity
AC Current
Range Input Value
0.0 to 320.0 A
400.0 A
320.0 to 400.0 A
600 A 400 to 600 A
± 1.0% position error
AC Voltage
Range
± (1.0% + 0.5 V)
400.0 V
± (1.0% + 5 V)
600 V
CM-900 is average sensing, RMS calibrated.
CM-950 is true RMS sensing. Accuracy is specified for sine waves at full scale and non-sine
waves below half scale. For non-sine waves, add the following crest factor corrections:
• Crest factor 1.4 to 2.0, add 1.0%
• Crest factor 2.0 to 2.5, add 2.5%
• Crest factor 2.5 to 3.0, add 4.0%
Maximum crest factor is 3 at 400 A or 400 V, and 2 at 600 A or 600 V.
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Accuracy (50 to 60 Hz)
Accuracy Frequency Response
± (1.5% + 0.5 A)
± (3.1% + 0.5 A)
± (2.0% + 7 A)
50 to 500 Hz
CM-900 • CM-950
Accuracy (61 to 400 Hz)
± (2.0% + 0.5 A)
± (3.6% + 0.5 A)
± (2.5% + 7 A)
Input Impedance
1 MΩ || < 100 pF
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