12
Accuracy
See the Specifications section 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) for voltage and resistance measurements
• 21
°
C to 26
°
C (70
°
F to 79
°
F) for current measurements
• 0% to 80% relative humidity
AC Current (21
°
C to 26
°
C) for CM-700*
Range
Input Value
Accuracy (50 to 60 Hz)
Accuracy (60 to 400 Hz)
0.0 to 40.0
±
(1.9% + 0.7 A)
±
(2.5% + 0.7 A)
400.0 A
40.0 to 200.0
±
(1.9% + 0.5 A)
±
(2.5% + 0.5 A)
200.0 to 400.0
±
(3.0% + 0.5 A)
±
(3.6% + 0.5 A)
600 A
400 to 600
±
(1.9% + 10 A)
±
(2.5% + 10 A)
AC Current (21
°
C to 26
°
C) for CM-750**
Range
Input Value
Accuracy (50 to 60 Hz)
Accuracy (60 to 400 Hz)
0.0 to 40.0
±
(1.9% + 0.7 A)
±
(2.5% + 0.7 A)
400.0 A
40.0 to 200.0
±
(1.9% + 0.5 A)
±
(2.5% + 0.5 A)
200.0 to 400.0
±
(3.5% + 0.5 A)
±
(3.6% + 0.5 A)
600 A
400 to 600
±
(1.9% + 10 A)
±
(2.5% + 10 A)
* CM-700 is average sensing, RMS calibrated.
** CM-750 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 (18
°
C to 28
°
C) for CM-700* and CM-750**
Range
Accuracy
Frequency Response
Input Impedance
400.0 mV
Unspecified
Unspecified
4.000 V
±
(1.5% + 0.005 V)
40 to 300 Hz
40.00 V
±
(1.5% + 0.05 V)
9 M
Ω
, 100 pF
400.0 V
±
(1.5% + 0.5 V)
40 to 500 Hz
600 V
±
(1.5% + 5 V)