Testing, Troubleshooting, and Maintenance
CENTRON® Meter Technical Reference Guide 71
Follow these steps to test the Wh LED:
1 Apply a constant delivered watts load (Wapp) to the meter.
2 Verify that the LED pulses properly either by counting the pulses or using a comparator
to compare the pulses from the meter under test to the standard.
To determine the number of pulses per second, use the following equation:
Testing Using the Disk Emulation Annunciator
The CENTRON meter is capable of visually being tested by using the Watt Disk Emulation
Annunciator.
Recommended Energy Testing Procedures
Testing solid-state meters on test boards that were designed primarily for electromechanical
meters may give unexpected results. Erroneous readings have been known to occur on “light
load” tests when the test sequence calls for said light load test to follow immediately after
the full load test. The problem is caused by improper “jogging” and can be avoided by
sequencing the test in order of applied power such that the lowest power is tested first. This
problem does not exist on modern test boards with the latest test software.
AEP Test Codes
The table below shows the AEP Test Codes.
Meter Specification Code
CL100 120V 2W 1 Phase Type C1S 15TA 1.0Kh FM1S 60Hz 2B
CL200 240V 3W 1 Phase Type C1S 30TA 1.0Kh FM2S 60Hz 1N
CL320 240V 3W 1 Phase Type C1S 50TA 1.0Kh FM2S 60Hz 2J
CL20 240V 2W 1 Phase Type C1S 2.5TA 1.0Kh FM3S 60Hz 2F
CL20 120V 2W 1 Phase Type C1S 2.5TA 1.0Kh FM3S 60Hz 2E
CL20 240V 3W 1 Phase Type C1S 2.5TA 1.0Kh FM4S 60Hz 2G
CL200 120V 3W 2 Phase Type CN1S 30TA 1.0Kh FM12S 60Hz 2H
CL200 120V 3W 2 Phase Type CN1S 30TA 1.0Kh FM25S 60Hz 2I
Field Testing
Field testing of the CENTRON meter may be accomplished with conventional methods
using either the infrared test pulses or the load emulation annunciator.
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