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Testing for the Nexus
Infrared
Test Pulse
Optical Port
WARNING!
The information contained within this chapter is intended to be an aid to qualified metering
personnel. It is not intended to replace the extensive training necessary to install or remove meters
from service. Any work on or near energized meters, meter sockets or other metering equipment
presents the danger of electrical shock, personal injury or death. All work on these products must
be performed by qualified industrial electricians and metering specialists ONLY.
All work must be done in accordance with local utility safety practices and the procedures outlined
in the current edition of the Handbook for Electricity Metering. The handbook is available from
the Edison Electric Institute, 701 Pennsylvania Avenue N.W., Washington D.C. 20004-2696.
4.1: Testing Tools
The Nexus® 1262 and 1272 meters are equipped with a light-emitting diode (LED) for calibration
and a liquid crystal display with test screens. These two standard features provide user interface and
equipment interface points for meter testing.
4.1.1: Test Pulse LED
The Test Pulse LED is located in the upper left-hand portion of the meter face as shown in Figure
4.1. The Test Pulse LED continuously emits calibration pulses (infrared light). This LED can be
used for a variety of pulses including: Individual quadrants for Watthour, VAhour, VARhour and
Watt Demand pulses. Each calibration pulse is equal to the value assigned to Kt (Watthours per
pulse) in the meter's Device Profile. The millisecond duration of each output pulse is also
programmable in the meter's Device Profile.
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Electro Industries/GaugeTech
Chapter 4
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Figure 4.1: The Nexus
Doc # E151701
1262/1272 Meter
Test Button
Under Cover
Reset Switch
1272 Meter
4-1
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