Other Parts Discussed in Thread: TIDM-SERVER-PWR-MON
Hi MSP Team,
My customer designed a single phase meter based on MSP430i2041 using TIDM-SERVER-PWR-MON as reference.
This meter has some problems.
When the USB is connected with PC for debugging, the circuit breaker goes down.
I guess the cause is that the AC and DC grounds are not separated.
Could you review schematic? If it is possible, I would like to send the schematic by personal mail.
The other problem is the measured value is not correct.
1. The current is high and active power is negative when there is no load.
Voltage in mV: 228012
Current in uA: 217837
Active power in mW: -44064
Reactive power in mW: 22945
Apparent power in mW: 49669
Power factor in 0.001 in mW: 8871
Frequency in 0.01 Hz: 6069
Voltage channel DC offset: 14502
Current channel DC offset: -1249715
2. When he removes two beads FB3, FB4, measured current is not zero.
Is it correct that the current will be zero when the beads are removed?
He made 20 boards and most of them have this problem.
How can I increase accuracy?