12
Accuracy
Refer to “Specifications” for operating conditions and temperature coefficient.
Accuracy is specified as follows:
±
(a percentage of the r a fixed amount) at
18
°
C to 28
°
C (64
°
F to 82
°
F), 0% to 80% relative humidity
AC Current
Range
Input Value
Accuracy (50 to 60 Hz)
Accuracy (61 to 400 Hz)
400.0 A
0.0 to 60.0
±
(1.9% + 0.7 A)*
±
(2.5% + 0.7 A)**
60.0 to 400.0
±
(1.9% + 0.5 A)
±
(2.5% + 0.7 A)
600 A
400 to 600
±
(1.9% + 5 A)
±
(2.5% + 7 A)
CM-800 is average sensing, RMS calibrated.
CM-850 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%
AC Voltage
Range
Accuracy
Frequency Response
Input Impedance
400.0 V
±
(1.0% + 0.5 V)*
50 to 500 Hz
1 M
Ω
|| < 100 pF
600 V
±
(1.0% + 5 V)
* Below 60.0 V, accuracy is
±
(1.0% + 0.9 V) for CM-850.
*
±
(1.9% + 1.1 A) for CM-850.
**
±
(2.5% + 1.1 A) for CM-850.
±
1.0% position error
