Appendix F Data Scales
EM720 Power Quality and Revenue Meter
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Appendix F Data Scales
The maximum values for volts, amps and powers in the
EM720 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 2
×
CT secondary (2.0A with 1A
secondaries and 10.0A with 5A secondaries).
4
Maximum power is rounded to whole kilowatts. With
PT=1.0, it is limited to 9,999,000 W.
