Appendices; Appendix A - Checking Kwh And Kvarh Registration Accuracy - Honeywell AS302P Operating Instructions Manual

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35. APPENDICES

35.1. APPENDIX A - Checking kWh and kvarh Registration Accuracy

WARNING
Only trained and competent personnel, familiar with meter test procedures should carry out the following operation.
Introduction
Various methods of checking the accuracy of registration of the AS302P meter are available.
Methods using the LED test indicator and Register advances are described below.
Note: The AS302P meter does not have potential disconnect links. Where multiple meters are to be tested, a multi-
secondary voltage transformer will be required.
1) Checking Meter Accuracy Using the LED Test Indicator
The kWh (if configured kvarh) test indicator pulses for both import and export energy measurement
2) Comparing LED Pulses with Substandard Meter Register Advance
What you will need
Suitable test equipment with a sensor to detect LED pulses
A suitable substandard meter
A counter for counting the number of LED pulses
Checking registration
In order to achieve a repeatability of 0.1% the test time at any load needs to be a minimum of 60 seconds.
1. Connect the test equipment and a suitable load to the meter, then power up the meter
2. The Test LED pulses for kWh (kvarh)
3. Run the test for a suitable duration and check the amount the substandard has advanced and the number of pulses
detected
Calculate the registration by dividing the number of pulses by the meter constant. e.g.
994 (LED count)
4000 (meter constant)
Compare this kWh (kvarh) advance with the amount the substandard has advanced.
© Honeywell - M450 001 1D - 23.05.2019
= 0.2485 kWh (kvarh) advance.
Operating & Maintenance Instructions
69