ADE7762 datasheet(11/28 Pages) AD

11 / 28 page

Preliminary Technical Data

ADE7762

Rev. PrB | Page 11 of 28

TERMINOLOGY

Measurement Error

The error associated with the energy measurement made by the

ADE7762 is defined by the following formula:

–

100

Energy

True

Energy

True

7762

ADE

Registered

Energy

Error

Percentage

⎭

⎬

⎫

⎩

⎨

⎧

Error between Channels

The high-pass filter (HPF) in the current channel has a phase

lead response. To offset this phase response and equalize the

phase response between channels, a phase correction network is

placed in the current channel. The phase correction network

ensures a phase match between the current channels and

voltage channels to within ±0.1° over a range of 45 Hz to 65 Hz

and ±0.2° over a range of 40 Hz to 1 kHz (see Figure 28 and

Figure 29).

Power Supply Rejection (PSR)

This quantifies the ADE7762 measurement error as a

percentage of reading when the power supplies are varied.

For the ac PSR measurement, a reading at a nominal supply

(5 V) is taken. A 200 mV rms/100 Hz signal is then introduced

onto the supply and a second reading is obtained under the

same input signal levels. Any error introduced is expressed as a

percentage of reading. See definition for Measurement Error.

For the dc PSR measurement, a reading at nominal supplies

(5 V) is taken. The supply is then varied ±5% and a second

reading is obtained with the same input signal levels. Any error

introduced is again expressed as a percentage of reading.

ADC Offset Error

This refers to the dc offset associated with the analog inputs to

the ADCs. It means that with the analog inputs connected to

AGND, the ADCs still see an analog input signal offset.

However, because the HPF is always present, the offset is

removed from the current channel and the power calculation is

not affected by this offset.

Gain Error

The gain error of the ADE7762 is defined as the difference

between the measured output frequency (minus the offset) and

the ideal output frequency. The difference is expressed as a

percentage of the ideal frequency. The ideal frequency is

obtained from the ADE7762 transfer function (see the Transfer

Function section).

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