B2.2 Comparing Led Pulses With Substandard Meter Pulses; B3 Checking Meter Registration Accuracy From Register Advances; B3.1 Using The 'Test' Values On The Meter Display - Elster A1100 Operating & Maintenance Instructions

B2.2 Comparing LED pulses with substandard meter pulses
This method may be used where the test equipment has the facility to calculate meter errors based on
the pulse output from a substandard meter. It will be necessary to set the pulse value of the meter under
test (shown on the meter nameplate) into the meter test equipment.
The duration of each test must be at least 60 seconds
The number of LED pulses should be greater than:-
Itest x V x Pf x N x K
60
B3 Checking Meter Registration Accuracy from Register Advances
For these methods the advance of the meter register is used rather than the LED.
B3.1 Using the 'Test' values on the meter display
Meters may be configured (at time of manufacture) to include special
test displays for the first one or two hours each time the meter is
powered up. For two rate meters, these test displays show the sum of
the internal Rate 1 and Rate 2 registers. Irrespective of the resolution
of the normal register displays, the test displays have 2 decimal digits
of kWh.
What you will need
A suitable supply and load or a meter test bench.
Substandard meter with a kWh display.
For each measured quantity:
1. Connect the meter and substandard meter to the supply
2. Record initial values of the meter and substandard meter registers
3. Apply a suitable load to cause a significant register advance
4. Switch off the load to stop the register advancing. Leave the supply connected
5. Record the final register readings, compute the advances and compare the meter advance with the
substandard advance
Operating & Maintenance Instructions
Itest = Test current
V = System voltage
p.f = Power factor of test load
N = Number of system elements
K = LED pulse value, impulses/kWh
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