Want to use SCXI 4hz filter on 1100 Module

[Primaira]

I am trying to use a SCXI 1100 to read analog inputs, 0-1V from humidity sensors. The signal is extremely noisy, so I switched the jumper to turn on the 4 hz filter on the 1100 board. This cleaned up the signal nicely when I view the inputs via the test panel in max.  Now, I am having difficulty setting the proper sampling time. I have twelve channels that I am reading from. I would like to have sample updates every 1 second (or faster). I am using LV 8.2. I had only one task created in DAQmax for all of my channels (also using two 1102's for TC's). Should I create a new task for only the 1100, and an additional one for the 1102's? I would like to maintain a quick sampling rate for the TC's on the 1102's, but can sacrfice speed on the 1100.

Or, can I filter the signal via software insteas of the 4 hz filter on the SCXI 1100?

Thanks for any help!!

[hoffiz]

Hi Primaira,

If you want to use different rates for different SCXI-modules I will like to remind you that the SCXI-1100 and the SCXI-1102 are just conditioning boards. The sampling rate is determined by the DAQ card use to control the SCXI chassis. For your second question you do have to add all your channels to one task if you are using just one DAQ card. Also take on notice that the sampling rate will decrease inversely proportional to the number of channels you add to the task.

Regarding your last question, yes you can filter in software take a look at our example “Express Filter.vi”