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Testing, Troubleshooting, and Maintenance
68 CENTRON® Meter Technical Reference Guide
Testing Support Features
Infrared Test LED
The CENTRON meter is equipped with an Infrared Test Light Emitting Diode (LED) (

in
the figure below) where each pulse represents a fixed value of watthour measurement. The
LED is located on the top of the meter as the meter is viewed from a typical installation. The
pulse weight represented by the LED pulses is 1.0 watthour per pulse (Kh=1.0).
Figure 34: Test LED Location
Pulse Detector
An optional pulse detector is available for the CENTRON meter. The pulse detector has an
infrared pickup with two visible LEDs. When positioned over the CENTRON light pipe as
shown in the figure below, it will produce a visible flash when an infrared pulse is received
from the metrology. The right LED will flash once for each infrared Wh pulse while the left
LED will flash once for every 10Wh infrared pulses received. The left LED on the pulse
detector is helpful when heavier loads are present on the system being examined. This can
be used to verify that the metrology is measuring energy when installed and to conduct
timing tests to determine the amount of load on meter.