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ADE7755ARSRL Folha de dados(PDF) 11 Page - Analog Devices |
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ADE7755ARSRL Folha de dados(HTML) 11 Page - Analog Devices |
11 / 20 page ADE7755 Rev. A | Page 11 of 20 TERMINOLOGY Measurement Error The error associated with the energy measurement made by the ADE7755 is defined by the following formula: % 100 7755 × − = Energy True Energy True ADE the by Registered Energy Error Percentage Phase Error Between Channels The high-pass filter (HPF) in Channel 1 has a phase lead response. To offset this phase response and equalize the phase response between channels, a phase compensation network is also placed in Channel 1. The phase compensation network matches the phase 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 30 and Figure 31. Power Supply Rejection (PSR) The PSR quantifies the ADE7755 measurement error as a percentage of the reading when the power supplies are varied. For the ac PSR measurement, a reading at nominal supplies (5 V) is taken. A 200 mV rms/100 Hz signal is then introduced onto the supplies and a second reading is obtained under the same input signal levels. Any error introduced is expressed as a percentage of the reading (see the Measurement Error definition). For the dc PSR measurement, a reading at nominal supplies (5 V) is taken. The supplies are 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 the reading. ADC Offset Error The ADC offset error 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 small dc signal (offset). The offset decreases with increasing gain in Channel 1. This specification is measured at a gain of 1. At a gain of 16, the dc offset is typically less than 1 mV. However, when the HPF is switched on, 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 ADE7755 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 1. The difference is expressed as a percentage of the ideal frequency. The ideal frequency is obtained from the ADE7755 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 and a gain of 2, 8, or 16. It is expressed as a percentage of the output frequency obtained under a gain of 1. This gives the gain error observed when the gain selection is changed from 1 to 2, 8, or 16. |
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