Data matching look like

Hello

I'm trying to collect data from 4 different channels using USB-6259 BNC and LabView 2009. When I try to their rally through a DAQ assistant, if there is an entry of a channel (channel say 0), data from different channels are also changing. I think that somehow they are coupled between them. I have connected my scale for channel 0, and aceelerometer tri - ax has been connected to channel 1-3.

Any ideas or suggestions?

Thank you

Jeong

Jeong,

the problem you describe may have two possible reasons that I can think of:

(a) too high sampling frequency. The multiplexer and ADC does not within the period of the sample so that you get a kind of crosstalk. It's rather unlikely, as the DAQmx driver would create an error if you set too high sampling frequency.

(b) signal sources have a high impedance. This will create the crosstalk because the voltage on a channel cannot be withdrawn by the second channel and therefore influence the measurement. If that's the reason (I wonder it is), you'll have to decouple the signal source and the measuring device using something like opto-Coupler...

hope this helps,

Norbert

Tags: NI Software

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