Appendix B - Checking Kwh Registration Accuracy; B1 Introduction; B2 Checking Meter Accuracy Using The Test Led; B2.1 Comparing The Number Of Led Pulses With Substandard Meter Register Advance - Elster A1100 Operating & Maintenance Instructions

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A1100 - Electronic Polyphase Meter

APPENDIX B - CHECKING KWH REGISTRATION ACCURACY

Only trained and competent personnel, familiar with meter test procedures should carry out the
following operation.
B1 Introduction
Various methods of checking kWh accuracy of registration of the A1100 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 the number of 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 (configured the same system configuration as the meter under test)
A counter for counting the number of LED pulses
Checking registration
In order to achieve a repeatability of 0.1% in the accuracy of the A1100 test indicator, the test time at
any load needs to be a minimum of 35 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
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)
500 (meter constant)
Compare this kWh advance with the amount the substandard has advanced.
© Elster Metering Systems - M180 001 1E - 6.2005
WARNING
= 1.988 kWh advance.