Operation: CP1SD/T/L Version
88
CENTRON® Polyphase Meter Technical Reference Guide
Demand Test Method
1
Connect the meter under test and the reference standard in the same circuit with all
voltage coils in parallel and current coils in series as per standard meter testing
procedures.
Figure 35: Test Connections
2
Apply rated voltage to the meter under test and the reference standard. Set the test
current to the desired level (FL, LL, or PF test amps or any desired level within the
meter rating). To ensure that the supply polarities are correct, check that the Load
Emulation Annunciator is traversing in the forward direction. Switch off only the
current to both the meter and the standard.
3
Reset and enable the pulse counting device.
4
Put the CENTRON Polyphase meter into Test Mode by pressing the Test switch. Once
this has been done, push in the Demand Reset switch to zero the test registers and start a
new demand interval.
5
Start the test by switching on the current to all meters and the reference simultaneously.
6
The End-of-Interval (EOI) flag will appear for five seconds in the display after the end
of the demand interval. At this time, switch off the current to all meters simultaneously
and stop the pulse count. Do
not
disconnect the voltage to the meter.
7
Record the pulse counter total and the values displayed on the CENTRON Polyphase
meter.
8
Perform calculations A, B, C, and D (if applicable) in the demand calculations section
and compare the results.
