thank you so much james,this is helpfull. But my question was not about pulse constant(pulse frequency). it's about error measurment. when you measure an error a test equipment there are parameters that you need to set (voltage,current,power factor,pulse constant(pulse/KWH)) then to measure the error you need to set the number of pulses after which the error is computed. for example if your pulse constant is 1600 and you want the error to be computed after 4 pulses(after (4*1/1600)KWH) you will set the number of pulses to 4.this number has an effect on testing the error variation. if I set the number of pulse to 1 the error will be computed for every LED(energy indicator ) blink,so here the variation is obviously high. but if I increased the number of pulses to some higher value,lets say 10.the error variation is decreased because the error computer uses averaging. so is there any limit on the " number of pulses after which the error is computed " please?
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