Hello Experts! Calling out for help again while I'm in difficulty. I'm working on a power meter setup using the ADE7763 and finding it difficult to get the correct Vrms, Vpeak, Irms, Ipeak values from the chip. I am using the attached schematic where R7+R6 = 1M, R8 = 1k. R12 and R13 are 8.8 ohms each. These are the values prescribed in the ADE7763 Evaluation Board and application note AN639 as well. My calculation is:
0.5Vpp at ADC input (V2P and V2N) corresponds to 260Vrms/367.64Vpp at full range ADC LSB (resolution) = 0.5/10322 Volts/Level (ADE7763 Datasheet Page 23) VRMS register should directly give me the ADC code converted to RMS value. Similarly, for current I do the below calculations:0.754Vpp at ADC input (V1P and V2N) corresponds to 20A of AC current ADC LSB (resolution) = 0.754/2,642,412 Volts/Level(ADE7763 Datasheet Page 23) IRMS register should directly give me the ADC code converted to RMS value. I'm not getting the correct values despite these above calculations. Is there something wrong in my calculations? Or am I missing/overlooking something from the datasheet?
I'm an Electronics engineer, just with little experience and hence I'm trying to understand as much as I can. So please excuse me if the queries are of a low level. Greatly appreciate your help!
Thanks a ton in advance!
The above is the schematic that I am using.
I actually have a customer demo tomorrow (Tuesday) and the board is still not giving correct values. I hope some good samaritan could read this post and help me with some information/direction soon.