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ADE7932 数据表(PDF) 32 Page - Analog Devices |
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ADE7932 数据表(HTML) 32 Page - Analog Devices |
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32 / 125 page  ADE7978/ADE7933/ADE7932/ADE7923 Data Sheet Rev. D | Page 32 of 125 TERMINOLOGY Energy Measurement Error The accuracy of the energy measurement is assessed as follows: 1. The voltage channel is supplied with a sinusoidal signal that has peak values equal to ±250 mV. This value represents half of the full scale. 2. The current channel is supplied with sinusoidal signals that have peak values equal to ±31.25 mV (full scale), ±3.125 mV (1/10 of full scale), ±312.5 µV (1/100 of full scale), ±31.25 µV (1/1000 of full scale), and ±15.625 µV (1/2000 of full scale). 3. The energy is accumulated in line cycle accumulation mode, and the accumulation time varies with the current channel signal level. The energy calculated for current peaks equal to ±3.125 mV (1/10 of full scale) is considered the reference. The energy measurement error is computed relative to a straight line that passes through this point, as follows: ( ) ( ) % 100 1 ) ( ) ( × − × × = ε 1/10 x 1/10 x 1/10 x I Energy I I I AccTime I AccTime I Energy (1) where: Energy(Ix) is the energy measurement when the current is Ix. Energy(I1/10) is the energy measurement when the current is I1/100, which is the reference measurement. AccTime(I1/10) is the accumulation time used to measure Energy(I1/10). AccTime(Ix) is the accumulation time used to measure Energy(Ix). I rms and V rms Measurement Error The accuracy of the rms measurement is assessed as follows: 1. The voltage and current channels are supplied with sinusoidal signals of various peaks, starting with the full-scale signals (±500 mV for the voltage channel and ±31.25 mV for the current channel) and ending with ±1 mV and ±62.5 µV, respectively. 2. The rms registers are read at least once per line cycle over 1 sec and averaged. The measurement performed when the input signal has peaks equal to 1/10 of full scale is considered the reference. The rms measurement error is computed relative to a straight line that passes through this point, as follows: ( ) ( ) % 100 1 × − × = ε 1/10 x 1/10 x I I rms I I I I rms I (2) ( ) ( ) % 100 1 × − × = ε 1/10 x 1/10 x V V rms V V V V rms V (3) where: I rms(Ix) is the current rms measurement when the current is Ix. I rms(I1/10) is the current rms measurement when the current is I1/10, which is the reference measurement. V rms(Vx) is the voltage rms measurement when the voltage is Vx. V rms(V1/10) is the voltage rms measurement when the voltage is V1/10, which is the reference measurement. Signal-to-Noise Ratio (SNR) SNR is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, excluding harmonics and dc. The waveform samples are acquired over 1 sec and then a Hanning window is applied. The value for SNR is expressed in decibels. Signal-to-Noise-and-Distortion (SINAD) Ratio SINAD is the ratio of the rms value of the actual input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The waveform samples are acquired over 1 sec and then a Hanning window is applied. The value for SINAD is expressed in decibels. Total Harmonic Distortion (THD) THD is the ratio of the rms sum of all harmonics (excluding the noise components) to the rms value of the fundamental. The waveform samples are acquired over 1 sec and then a Hanning window is applied. The value for THD is expressed in decibels. Spurious-Free Dynamic Range (SFDR) SFDR is the ratio of the rms value of the actual input signal to the rms value of the peak spurious component over the measurement bandwidth of the waveform samples. The waveform samples are acquired over 1 sec and then a Hanning window is applied. The value of SFDR is expressed in decibels relative to full scale, dBFS. CF Jitter The period of pulses at one of the CF1, CF2, or CF3 pins is continuously measured. The maximum, minimum, and average values of four consecutive pulses are computed as follows: Maximum = max(Period0, Period1, Period2, Period3) Minimum = min(Period0, Period1, Period2, Period3) Average = 4 3 2 1 0 Period Period Period Period + + + The CF jitter is then computed as follows: % 100 × − = Average Minimum Maximum CFJITTER (4) |
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