Manual said chop=1 analog switch will cross, collected one is positive, negative signal collection once again, the average, can eliminate the bias of the circuit, but I could collect all close to 0, FFFFFC 00001 d, is close to zero value, not the input voltage value, what reason be?

CodePudding user response:

Look from the speed of acquisition, did half speed, if the inner channel and chop=1, the speed is halved, the result of the acquisition than "used in the channel and chop=0" in higher precision,
But the outer channel chop or chop=1=0, collection value is close to zero, as if outside channel voltage is only 0, but the actual measurement is a 0.5 v voltage???????