ADE7752B_15 datasheet(9/24 Pages) AD

9 / 24 page

ADE7752B

Rev. 0 | Page 9 of 24

TERMINOLOGY

Measurement Error

The error associated with the energy measurement made by the

ADE7752B is defined by the following formula:

Percentage Error =

100

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

True Energ

–

ADE7762

istered by

Energy Reg

(1)

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 the

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 21 and

Figure 22).

Power Supply Rejection (PSR)

This quantifies the ADE7752B 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 the 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 ADE7752B 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 ADE7752B transfer function (see the

Transfer Function section).

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