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Installation and Operation
2.3.2
Step 2: Calibration of the Frequency Output Using the Voltage
Divider Calibration Circuit
Each meter must be calibrated using the voltage divider circuit going into channel 1 of
the MCP3907 device. A known power is supplied to the meter (e.g 1000W), aiming the
output frequency of 1000 imp/kWh as a goal. The resistor divider is then successively
lowered until the output frequency is matched. For more detailed information regarding
meter calibration and the PCB design approach used with the circuitry described in this
document, please refer to AN994 application note.
FIGURE 2-2:
Reference Design.
Picture of Complete Stand-Alone MCP3907 Energy Meter
2.4
MCP3907 ENERGY METER REFERENCE DESIGN OVERVIEW
This reference design can be used as either a complete stand-alone mechanical
counter energy meter, or as the analog front-end design in advanced microcontroller
based meter designs.
The analog front-end (AFE) design limits the overall meter accuracy. A low-noise,
proven AFE circuit and layout is still required for a high accuracy meter. For both meter
types the current sense input, voltage sense input, calibration scheme, jumper
selection and power supply, the design blocks described here should apply.
This design keeps all of the major components on the back side of the PCB. This
minimizes any environmental side effect when a meter case experiences failure. Only
the necessary components for calibration, jumper selection and external connections
are placed on the front side of the board. Keeping the larger DC power supply compo-
nents on the back side of the board is also necessary, for installation in some meter
cases with PCB stand-offs.
? 2010 Microchip Technology Inc.
DS51917A-page 13
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