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Nexus®1262/1272 Meter Overview
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Infrared Test
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Optical Port
2.1: The Nexus® 1262/1272 Multiparameter Power Meter
The Nexus® 1262/1272 transformer-rated, polyphase meter is a unique collection of metering technolo-
gies to fulfill advanced metering requirements. It provides high-accuracy power and energy measure-
ments of voltage, current and all power values, data logging and power quality recording. The unit
makes the data available through the display, connected systems and historic logs.
2.2: Accu-M M easure
The advanced metering capability of the Nexus® 1262/1272 device is a result of EIG's Accu-Measure
Digital Sensing Technology. Accu-Measure
high-resolution measurement and high-speed calculation. All voltage and current waveforms are sam-
pled and RMS values calculated continuously every cycle. Values of voltage, current and power are pro-
duced every three cycles and every second.
Figure 2.2 illustrates the key processes operating within the Nexus® 1272 meter. The meter allows for
four types of inputs and can provide outputs to an integrated display, pulse outputs and several
communication ports. Nexus® 1262 meter processses are illustrated in Figure 2.3.
Voltage and current signals enter the meter and are sampled at up to 256 samples per cycle. Each sample
is resolved to a digital value using 16-bit analog-to-digital converters. Two 16-bit A/D converters are
used for the 1272 (one for 1262). The first is for the real-time measurements. The second is for the
waveform recorder. The use of two A/D converters ensures that both signals have maximum resolution,
accuracy and integrity. The second also isolates energy sampling and calculations from the waveform
fault recording requirements. This provides both advanced energy and advanced waveform analysis.
Electro Industries/GaugeTech
Chapter 2
Figure 2.1: The Nexus® 1272 Meter
Technology - Theory of Operation
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technology is a combination of high-speed sampling,
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