Data scales, Appendix g, In appendix – SATEC EM920 Operation Manual User Manual
Page 224: Appendix g data scales
Appendix G Data Scales
224
EM920 Power Quality and Revenue Meter
Appendix G Data Scales
The maximum values for volts, amps and powers in the
EM920 setup and in communications are limited by the
voltage and current scale settings. See
in Chapter 5 on how to change the voltage and
current scales in your meter.
The following table shows the meter data scales.
Scale Range
Maximum voltage (V max)
Voltage scale × PT Ratio, V
1
Maximum current (I max)
Current scale × CT Ratio, A
2, 3
Maximum Power (P max)
4
V max × I max × 2, W
Maximum frequency
100 Hz
1
The default voltage scale is 144V (120V+20%).
2
CT Ratio = CT primary current/CT secondary current
3
The default current scale is 4 × CT secondary (4.0A with 1A
secondaries and 20.0A with 5A secondaries).
4
Maximum power is rounded to whole kilowatts. With
PT=1.0, it is limited to 9,999,000 W.