System Architecture Meter Overview
2-6 Meter Overview TM-iX0A-0805
Sensor Board
The Sensor Board is a part of the Meter Base Assembly and consists of the sensing circuitry,
buss bars, power supply, and connector ports. There are no field serviceable components in the
base assembly.
The module:
• Senses all of the voltages and currents for all phases passing through the meter
• Provides the DC power for the rest of the meter
• Contains the data of all of the sampled energy and voltages
• Supports reading of the sampled data by the Register Display Board
• Holds the calibration information stored in EEPROM
Buss Bars — The buss bars are conducting blades that carry the load current from the service
socket to the load. In self-contained meters, the buss bars provide the voltage inputs to the
metrology and provide power to the meter’s internal power supply.
Sensing Circuitry — The primary components include a patented linear current sensor and
integrated circuitry specifically designed for poly-phase electricity metering. The ADE7758 is a
24-pin, poly-phase, energy measuring, integrated-circuit chip with a serial interface and pulse
outputs. This chip measures/calculates the following values:
• Active Energy - Wh
• Reactive and Apparent Energy – VARh and VAh
• RMS Voltages
• RMS Currents
• Temperature
The chip is suitable for three-phase, three-wire and/or three-phase, four-wire Delta or Wye
services. This chip stores the measurement samples of each quantity and supports read operations
by the Register Display Board.
Switching Power Supply — The power supply is a true, three-phase, surge protected,
auto-ranging (96 VAC to 576 VAC) power supply. It accepts voltages present at the service
socket and provides DC power for the rest of the meter. The power supply functions even with
power present on only one phase.
Connector Ports — The Connector Ports provide the physical links to the Sensor Board for the
Interconnect Board and the Option Cards.
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