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ES7 Datasheet(PDF) 9 Page - Cyrustek corporation |
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ES7 Datasheet(HTML) 9 Page - Cyrustek corporation |
9 / 10 page 09/07/08 9 ES7 True RMS-to-DC Converters Choosing the Averaging Time Constant The ES7 computes the RMS value of AC and DC signals. At low frequencies and DC, the output tracks the input exactly; at higher frequencies, the average output approaches the RMS value of the input signal. The actual output differs from the ideal by an average (or DC) error plus some amount of ripple. The DC error term is a function of the value of Cav and the input signal frequency. The output ripple is inversely proportional to the value of Cav. Waveforms with high crest factors, such as a pulse train with low duty cycle, should have an average time constant chosen to be at least ten times the signal period. Using a large value of Cav to remove the output ripple increases the setting time for a step change in the input signal level. Figure 4 shows the relationship between Cav and 1 % settling time, where 110ms settling equals 4uF of Cav. The settling time, or time for the RMS converter to settle to within a given percent of the change in RMS level, is set by the averaging time constant, which varies approximately 2:1 between decreasing and increasing input signals. In addition, the settling time also varies with input signal levels, increasing as the input signal is reduced, and decreasing as the input is increased. Frequency Response ES7 utilizes a logarithmic circuit in performing the RMS computation of the input signal. Table 1 represents the simplified frequency response of the converters from 35mV to 400mV for ES7. Caution must be used when designing RMS measuring systems so that overload does not occur. The input clipping level for ES7 is ±10V. Error RMS ±1% ±3db 35mV 50KHz 1MHz 100mV 200KHz 1MHz 200mV 200KHz 1MHz 400mV 200KHz 500KHZ Table 1 4 |
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