About the dynamic metering error on ADE7858!
We find the high dynamic errors while testing a kind of smart merter in China.And ADE7858 is integrated in this kind of samrt meter.Would you help me to deal with the following questions?
1, Does the setting time cause the high dynamic error in ADE7858 ? The condition of dynamic error testing is to connected the testing current for one frequency cycle, then disconnect for 40 frequency cycle, and then repeat.
2, But the dynamic error is lower in another dynamic testing which is to connected the testing current for one frequency cycle, then disconnect for 20 frequency cycle, and then repeat. Can you help me to explain it?
3, What kind of low-pass filter is used in measuring instantaneous active power? That is Butterworth? And why the frequency response of this low-pass filter in ADE7858
is very different to ADE7758? Is it for harmonic?
4, Is there a delay time when changing the range in PGA Befor ADC sampling, If yes, how many seconds?