ADE7753ARS datasheet(38/60 Pages) AD

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ADE7753

Rev. C | Page 38 of 60

ENERGIES SCALING

The ADE7753 provides measurements of active, reactive, and

apparent energies. These measurements do not have the same

scaling and thus cannot be compared directly to each other.

Table 10. Energies Scaling

PF = 1

PF = 0.707

PF = 0

Integrator On at 50 Hz

Active

Wh × 0.707

Reactive

Wh × 0.508

Wh × 0.719

Apparent

Wh × 0.848

Integrator Off at 50 Hz

Active

Wh × 0.707

Reactive

Wh × 0.245

Wh × 0.347

Apparent

Wh × 0.848

Integrator On at 60 Hz

Active

Wh × 0.707

Reactive

Wh × 0.610

Wh × 0.863

Apparent

Wh × 0.827

Integrator Off at 60 Hz

Active

Wh × 0.707

Reactive

Wh × 0.204

Wh × 0.289

Apparent

Wh × 0.827

CALIBRATING AN ENERGY METER BASED ON THE

ADE7753

The ADE7753 provides gain and offset compensation for active

and apparent energy calibration. Its phase compensation corrects

phase error in active, apparent and reactive 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 ADE7753.

When using a reference meter, the ADE7753 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 ADE7753. If it is desired to use a

reference meter for calibrating the VA and VAR, then additional

code would have to be written in a microprocessor to produce a

pulsed output for these quantities. Otherwise, VA and VAR

calibration require an accurate source.

The ADE7753 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 in the active energy is eliminated. Up to 65535

half line cycles can be accumulated, thus providing a stable

energy value to average. The accumulation time is calculated

from the line cycle period, measured by the ADE7753 in 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 any apparent

energy offset. A gain calibration is also provided for apparent

energy. Figure 79 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 78 shows the calibration flow for the active energy

portion of the ADE7753.

WATT GAIN CALIBRATION

WATT OFFSET CALIBRATION

PHASE CALIBRATION

02875-A-005

Figure 78. Active Energy Calibration

The ADE7753 does not provide means to calibrate reactive

energy gain and offset. The reactive energy portion of the

ADE7753 can be calibrated externally, through a MCU.

WATT/VA GAIN CALIBRATION

WATT OFFSET CALIBRATION

RMS CALIBRATION

PHASE CALIBRATION

02875-A-002

Figure 79. Apparent and Active Energy Calibration

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