Aclara I-210+, User Manual

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I-210+ User Manual
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Chapter 4 • Maintenance
Shop Testing
Shop testing consists of verifying the meter’s accuracy.
Meter Shop Equipment
The meter loading equipment must be capable of maintaining accuracy while
supplying energy to the meter's broad range switching power supply. Otherwise,
meters may be tested in any shop that meets the requirements outlined in the
current editions of the
Handbook for Electricity Metering
published by the Edison
Electric Institute.
Test Constant
The meter test constant (Kt) is the number of watt-hours per optical calibration
pulse.
Watt-Hour Test Procedure
To test the meter, proceed as follows:
1.
Note the meter Kt value listed on the nameplate.
2.
Select the desired voltage and current level(s) on the test equipment.
3.
Install the meter in the test socket, making certain that the socket is wired
and/or configured for the appropriate meter form.
4.
Align the optical pickup of the test equipment with the calibration LED.
5.
Begin testing according to standard test procedures. Allow 15 seconds of
settling time after applying voltage before making accuracy measurements
(20 seconds if modem installed).
6.
Check the meter calibration under three load conditions: full load, light
load, and full load with lagging power factor. A minimum test time of 30
seconds is needed to reduce test uncertainty to a level compatible with the
accuracy of the I-210+ meter. (Check the instruction book for your test
board or standard to determine the actual minimum test time.)