ADE7763ARS datasheet(34/56 Pages) AD

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ADE7763

Rev. A | Page 34 of 56

ENERGIES SCALING

The ADE7763 provides measurements of active and apparent

energies. These measurements do not have the same scaling and

therefore cannot be compared directly to each other.

Table 7. Energies Scaling

PF = 1

PF = 0.707

PF = 0

Integrator on at 50 Hz

Active

Wh × 0.707

Apparent

Wh × 0.848

Integrator off at 50 Hz

Active

Wh × 0.707

Apparent

Wh × 0.848

Integrator on at 60 Hz

Active

Wh × 0.707

Apparent

Wh × 0.827

Integrator off at 60 Hz

Active

Wh × 0.707

Apparent

Wh × 0.827

CALIBRATING AN ENERGY METER

The ADE7763 provides gain and offset compensation for active

and apparent energy calibration. Its phase compensation corrects

phase error in active and apparent energy. If a shunt is used,

offset and phase calibration may not be required. A reference

meter or an accurate source can be used to calibrate

the ADE7763.

When using a reference meter, the ADE7763 calibration output

frequency, CF, is adjusted to match the frequency output of the

reference meter. A pulse output is only provided for the active

energy measurement in the ADE7763. If a reference meter is

used to calibrate the VA, then additional code must be written

in a microprocessor to produce a pulsed output for this

quantity. Otherwise, VA calibration requires an accurate source.

The ADE7763 provides a line cycle accumulation mode for

calibration using an accurate source. In this method, the active

energy accumulation rate is adjusted to produce a desired CF

frequency. The benefit of using this mode is that the effect of the

ripple noise on the active energy is eliminated. Up to 65,535 half

line cycles can be accumulated, therefore providing a stable

energy value to average. The accumulation time is calculated

from the line cycle period, measured by the period register, and

the number of half line cycles in the accumulation, fixed by the

LINECYC register.

Current and voltage rms offset calibration removes apparent

energy offset. A gain calibration is also provided for apparent

energy. Figure 70 shows an optimized calibration flow for active

energy, rms, and apparent energy.

Active and apparent energy gain calibrations can take place

concurrently, with a read of the accumulated apparent energy

Figure 69 shows the calibration flow for the active energy

portion of the ADE7763.

WATT GAIN CALIBRATION

WATT OFFSET CALIBRATION

PHASE CALIBRATION

Figure 69. Active Energy Calibration

WATT/VA GAIN CALIBRATION

WATT OFFSET CALIBRATION

RMS CALIBRATION

PHASE CALIBRATION

Figure 70. Apparent and Active Energy Calibration

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