Operating & Maintenance Instructions
39
_____________________________________________________________________________________
APPENDIX B - Checking kWh Registration Accuracy
B1 Introduction
Various methods of checking kWh accuracy of registration of the A100C meter are available.
Methods using the LED and Register advances are described below.
B2
Checking Meter Accuracy Using the Test LED
The meter test LED is configured at manufacture to pulse for import kWh (import only meter)
or pulse for import plus export kWh (import/export or power flow insensitive meters).
B2.1
Comparing a number of LED pulses with a 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
1.
Connect the test equipment and a suitable load to the meter, then power up the meter
2.
The Test LED pulses for kWh
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. 1988 (LED count) = 1.988 kWh advance.
1000 (meter constant)
Compare this kWh advance with the amount the substandard has advanced.
