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ADE7762ARWZ датащи(PDF) 11 Page - Analog Devices |
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ADE7762ARWZ датащи(HTML) 11 Page - Analog Devices |
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 by 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). |
Аналогичный номер детали - ADE7762ARWZ |
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Аналогичное описание - ADE7762ARWZ |
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