Analog input on OP7200

Rabbit Rabbit Software
1

Hi,

Please help me to solve this problem.

I use OP7200 to input analog signal, but the voltage is not correct.

Will be more 0.060v when plug wire in, although no signal.

So, I try to use “adrd_se_ch.c” to check voltage for analog Pin that no wire plug in.

All have value from 0.020v to 0.025v… I think it must be Zero, since no signal in.

Please help & give me an advice.

Thanks.

2

You might need to recalibrate your inputs to get a reading closer to 0, or update your code to consider voltages below some threshold as equivalent to 0.

What happens if you check that pin with a volt meter compared to the analog ground?