Appendix F Data Scales - Satec Expertmeter EM720 Operation Manual

Appendix F Data Scales

Appendix F Data Scales
EM720 Power Quality and Revenue Meter
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
Mode Control in Chapter 5 on how to change the voltage
and current scales in your meter.
The following table shows the meter data scales.
Scale
Maximum voltage (V max)
Maximum current (I max)
Maximum Power (P max)
Maximum frequency
The default voltage scale is 144V. The recommended
1
voltage scale is 120V+20% = 144V for use with external
PT's, and 480V+25% = 600V for a direct connection to
power line.
CT Ratio = CT primary current/CT secondary current
2
The default current scale is 2 × CT secondary (2.0A with
3
1A secondaries and 10.0A with 5A secondaries).
Maximum power is rounded to whole kilowatts. With
4
PT=1.0, it is limited to 9,999,000 W.
Device Options and
Voltage scale × PT Ratio, V
Current scale × CT Ratio, A
V max × I max × 2, W
4
100 Hz
Range
1
2, 3
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