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ADE7761AARS-REF データシート(PDF) 8 Page - Analog Devices |
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ADE7761AARS-REF データシート(HTML) 8 Page - Analog Devices |
8 / 24 page ADE7761A Rev. 0 | Page 8 of 24 TERMINOLOGY Measurement Error The error associated with the energy measurement made by the ADE7761A is defined by ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × − = % 100 Energy True Energy True ADE7761A 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 among channels, a phase correction network is also 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. Power Supply Rejection (PSR) PSR quantifies the ADE7761A measurement error as a percentage 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). 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 The dc offset associated with the analog inputs to the ADCs. With the analog inputs connected to AGND, the ADCs still see a dc analog input signal. The magnitude of the offset depends on the input gain and 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 ADE7761A ADCs is defined as the difference between the measured output frequency (minus the offset) and the ideal output frequency. It is measured with a gain of 1 in Channel V1A. The difference is expressed as a percentage of the ideal frequency, which is obtained from the transfer function (see the Transfer Function section). Gain Error Match The gain error match is defined as the gain error (minus the offset) obtained when switching between a gain of 1 or 16. It is expressed as a percentage of the output ADC code obtained under a gain of 1. |
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同様の説明 - ADE7761AARS-REF |
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