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AD71056ARZ-RL Datasheet(PDF) 6 Page - Analog Devices |
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AD71056ARZ-RL Datasheet(HTML) 6 Page - Analog Devices |
6 / 20 page AD71056 Rev. A | Page 6 of 20 TERMINOLOGY Measurement Error The error associated with the energy measurement made by the AD71056 is defined by the following formula: % 100 % × − = Energy True Energy True AD71056 by Registered Energy Error Phase Error Between Channels The high-pass filter (HPF) in the current channel (Channel V1) 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 Channel V1. The phase correction network matches the phase to within 0.1° over a range of 45 Hz to 65 Hz, and 0.2° over a range 40 Hz to 1 kHz (see Figure 23 and Figure 24). Power Supply Rejection (PSR) This quantifies the AD71056 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 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 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 reading. ADC Offset Error This refers to the small dc signal (offset) associated with the analog inputs to the ADCs. However, the HPF in Channel V1 eliminates the offset in the circuitry. Therefore, the power calculation is not affected by this offset. Frequency Output Error (CF) The frequency output error of the AD71056 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 AD71056 transfer function. See Figure 14 for a typical distribution of part-to-part variation of CF frequency. Gain Error The gain error of the AD71056 is defined as the difference between the measured output of the ADCs (minus the offset) and the ideal output of the ADCs. The difference is expressed as a percentage of the ideal output of the ADCs. Oscillator Frequency Tolerance The oscillator frequency tolerance of the AD71056 is defined as the part-to-part frequency variation in terms of percentage at room temperature (25°C). It is measured by taking the difference between the measured oscillator frequency and the nominal frequency as defined in the Specifications section. Oscillator Frequency Stability Oscillator frequency stability is defined as the frequency variation in terms of the parts-per-million drift over the operating temperature range. In a metering application, the temperature range is −40°C to +85°C. Oscillator frequency stability is measured by taking the difference between the measured oscillator frequency at −40°C and +85°C and the measured oscillator frequency at +25°C. |
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