I had a project which uses 7878, and a calibration software was already there.
Now the metering chip is replaced with 7880, can the same calibration software be applied?
Or can any minimum change of that calibration software?
Please take a look at the "Differences Between the ADE7880 and the ADE7878" application note. There are differences that can affect aspects of calibration. For example, the WTHR register and APGAIN instead of AWGAIN, AVARGAIN and AVAGAIN are a couple difference.
Calibration app note for the ADE7880: https://www.analog.com/media/en/technical-documentation/application-notes/AN-1171.pdf
Thank you, dlath
I always get non-zero reactive power after my calibration, can you comment?
1. using ADE7880
2. Accurate source: Transmile 3050A(+Power Module)
3. Calibration steps follow the application note 1076 (ADE7878 calibration)
4. current is measured by CT
The result voltage/current/active power/active energy seem good when PF=1. But the corresponding reactive power is obviously non-zero.
e.g. nominal voltage=110V; nominal current=10A; PF=1 => my 7880 can report active power around 1100 watt, but it also reported re-active power around 50 var. The angle register told about 0.5 degree between voltage and current.
And when I set the same environment to PF=0, similar problem happened to active power. It means re-active power is about 1100 var, but the active power is now 50 watt
How it could come? Should be a problem of phase calibration?