Aclara SGM1400 Series, User Manual

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S G M 1 4 0 0 S e r i e s S m a r t M e t e r U s e r M a n u a l – S M E T S 2
Test Procedures
Test Procedures
The following sections describe the requirements and steps for performing various
tests.
Field Accuracy Test
Test mode allows the meter to be tested for accuracy in the field without
disturbing any billing data. In order to check the accuracy of the meter in the field,
a portable standard and a phantom load generator is required.
Connect to voltages of the source, the reference meter, and the test meter in
parallel. Connect the current of each in series.
1.
Verify that the parameters/ranges in the reference meter are set separately
from the test meter.
2.
Apply voltage in accordance with the meter’s nameplate marking to the
reference meter, test the meter through phantom load, and warm up for 20
minutes.
3.
Enter the meter constant in the reference meter (for example, 1000imp/kWh).
4.
Apply current to the meter (e.g., 10 amps) and unity power factor (UPF) for
direct connected meters rated to 100 amps.
5.
Set or hold the optical sensor connected to the reference meter on the
calibration LED/pulse LED of the test meter.
6.
Take accuracy for pulses calculated for 25 seconds for Iref (10A for direct
connect meters).
7.
Take accuracy for pulses calculated for 120 seconds for below Iref (10A for
direct connect meters) loads and configure the reference meter for 120
seconds.
8.
Start an accuracy check on the reference meter.
9.
After the configured test duration, the reference meter will show the accuracy
of the meter.
If a meter fails to yield the desired accuracy, it may need to be recalibrated or
replaced.
Watt-Hour Test
1.
Note the meter test constant value listed on the nameplate.
2.
Select the desired voltage (in accordance with the meter’s nameplate
marking) and current level(s) on the test equipment.
3.
Install the meter in a test panel that is wired and configured for the meter.
4.
Begin testing according to standard test procedures. Allow 15 seconds of
settling time after applying voltage before making accuracy measurements.
Check the meter calibration under three load conditions:
•
full load
•
light load
•
full load with lagging power factor