Baseline difference across channels

[zlyhere]

Hi, I have a PCI-6071E card and doing acquisition from 16 channels at 20kHz sampling rate. Recently when I connect the same signal to the 16 channels, I found the baseline is different for some of the channels. For example, if I provide a 0V DC to all 16 channels. Ch0-3 give negative reading, Ch4-7 give zero. Does this mean I need to calibrate the card? It seems to me calibration adjusts the only ADC on the card which will affect all the channels together.

Thanks!

[LindyHop]

Hello zlyhere,

It sounds like there is some damage to those specific channels. Can you read on the other channels of the device correctly?

[zlyhere]

Hi Jonathan,

Thanks for your answer. For the other channels, some of them can be read correctly, some cannot.

Lingyun

[Aaron_W.]

How much of a voltage difference are we talking about?

[zlyhere]

Hi Aaron,

It's less than 1V if the input range is -10V to 10V, for example, about 200mV.

Moreover, when I use the test panel in MAX to visualize input signals, some channels give a "fatal error" (code -10007).

These channels are 8-15, 24-31, 40-47, 56-63.

Thanks!