Greenlee CM-1500, Instruction Manual

Page: 13 / 128

CM-1500 • CM-1550
13
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 A
±
(1.5% + 0.5 A)*
±
(1.9% + 0.5 A)**
60.0 to 400.0 A
±
(1.5% + 0.5 A)
±
(1.9% + 0.5 A)
1000 A 400 to 1000 A
±
(1.9% + 7 A)
±
(2.5% + 7 A)
CM-1500 is average sensing, RMS calibrated.
CM-1550 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 2 at 600 A or 600 V, and 1.5 at 1000 A or 750 V.
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
750 V
±
(1.0% + 5 V)
*
±
(1.5% + 0.7 A) for CM-1550.
**
±
(1.9% + 0.7 A) for CM-1550.
±
1.0% position error
* Below 60.0 V, accuracy is
±
(1.0% + 0.7 V) for CM-1550.