how to use PXI 6071E daq card to complete multichannels scan with high sampling speed

[sunny 711]

I used pxi 6071E daq card to acquire 115v 400hz AC signals.when I use mutichannel scan function,I find that the voltage of waveforms have much more error.The voltage error is about 0~15v.please you can tell me why this happened?how to solve it.

[Filipe A.]

Sunny;

As you are scanning multiple channels and the signal range is high, you can try to set the interchannel delay a little higher. The interchannel delay is the time which the multiplexer will take to switch to the next channel. If that time is to short, the instrumentation amplifier can have problems to settle, and then an error at the reading will happen.
You can change the Interchannel delay at the AI Config.vi.
Hope this helps.
Filipe