Different readout in single channel and multichannel mode

I am puzzled by one observation. I use labview 7.1 in windows XP. I have one PCI-M6229 board and two PCI-6713 boards. I use the Analog in channels to read signal, which will control other digital channels.
After I wired things up and programmed my VIs, I run many tests. When I read out individual channels separately, I got the correct reading displayed in the Graphs in my VI. However, when I use the graph display to show the readout from individual channels acquired with the Analog 1D Wfm NChan NSamp VI, the readout is offset by several Volts in the negative direction. The signals are not stable either. Everytime I turn on the VI, the voltage drift from what appear to be the correct reading toward the offset, then stablize. If I stop the VI and turn it back on quickly, the drift is not obvious and sticks to the offset. The longer I wait till I turn on the VI, the more it drifts.
Initially I though I had miswired the external instrument. I did extensive checking and testing and found no apparent problem. All reading with a multimeter is what supposed to be. What convinced me this is not external problem is the fact that when read as independent channels, the display is fine, just the same as read out by the multimeter. I am baffled because this appears to have something to do with how the signal is read out in the computer and may have a software origin.
Has anyone seen similar problem? Or have I missed something big time and not knowing it? Please, any advice helps.
Thanks,
Ron

Ron,
I am not familiar with your DAQ hardware but this sounds like a case of unterminated inputs floating to the power supply rails and creating havoc with the multiplexer and amplifier. Many DAQ cards use a single analog to digital converter (A/D) and switch the input channels to it via a multiplexer (MUX). Unused inputs may look like a capacitor and can charge up (or down) to one of the power supply voltages or anywhere between due to leakage currents. Depending on the design of the multiplexer and the amplifier following it, these inputs charged to maximum may cause offsets or crosstalk between channels.
The cure: 1) Terminate all unused channels to the ground, common, or sense input for AI. It may have various names on different boards.
2) Drive all the channels you are using from low impedance sources such as a buffer amplifier. High source impedances aggravate the problem you are seeing.
3) Make sure you allow enough time for the multiplexer and amplifier to settle to the new value after switching. The DAQ manual should have data on settling times. Depending upon how fast the MUX and amplifier switch and settle, the throughput on a multichannel board may be quite a bit slower than the maximum sampling rate divided by the number of channels. Again, read the manual.
Lynn

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