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ADE7761ARS 데이터시트(PDF) 8 Page - Analog Devices |
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ADE7761ARS 데이터시트(HTML) 8 Page - Analog Devices |
8 / 28 page ADE7761 Rev. A | Page 8 of 28 TERMINOLOGY Measurement Error The error associated with the energy measurement made by the ADE7761 is defined by the following formula: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × − = % 100 7761 Energy True Energy True ADE by registered Energy Error Percentage Phase 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 40 Hz to 1 kHz. Power Supply Rejection This quantifies the ADE7761 measurement error as a percent- age of reading when the power supplies are varied. For the ac PSR measurement, a reading at nominal supplies (5 V) is taken. A second reading is obtained with the same input signal levels when an ac (175 mV rms/100 Hz) signal is introduced onto the supplies. Any error introduced by this ac signal is expressed as a percentage of reading (see the Measurement Error definition above). For the dc PSR measurement, a reading at nominal supplies (5 V) is taken. A second reading is obtained with the same input signal levels when the power supplies are varied ±5%. 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 a dc analog input signal. The magni- tude of the offset depends on the input range selection (see the Typical Performance Characteristics section). However, when HPFs are switched on, the offset is removed from the current channels and the power calculation is not affected by this offset. Gain Error The gain error in the ADE7761 ADCs is defined as the differ- ence between the measured output frequency (minus the offset) and the ideal output frequency. The difference is expressed as a percentage of the ideal frequency, which is obtained from the transfer function (see the Transfer Function section). |
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