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ADE7752AARZ Datasheet(PDF) 11 Page - Analog Devices |
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ADE7752AARZ Datasheet(HTML) 11 Page - Analog Devices |
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11 / 24 page  ADE7752/ADE7752A Rev. C | Page 11 of 24 TERMINOLOGY Measurement Error The error associated with the energy measurement made by the ADE7752 is defined by the following formula: 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. % Energy True Energy True – ADE by Registered Energy Error Percentage 100 7752 × ⎭ ⎬ ⎫ ⎩ ⎨ ⎧ = 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 also placed in the current channel. The phase correction net- work 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 Gain Error The gain error of the ADE7752 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 ADE7752 transfer function. See the Transfer Function Figure 24 and section. Figure 26. Power Supply Rejection (PSR) This quantifies the ADE7752 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. |
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