Scaling problems with DAQ Assist

I'm a new user and am trying to do some simple scaling of my voltage inputs using the DAQ Assist. For example: one channel inputs around 8V on a 0 to 10V input selection. I am trying to scale it (linear) to show me around 28V by using the y=mx+b formula. My m value is 3.2 and b is 0. What the DAQ assist reads is around 16V instead of 25V (3.2 * 8). I custom make several scales, basically multiplying the input by 2, 3, 4, & 5, but none of them outputs what I would expect according to the formula and even the 5x causes the displayed value to decrease. If I go to "no scale" I read 8V, which is what is actually coming into the 6255 card. Any thoughts?
Solved!
Go to Solution.

Hello DB66,
Keep in mind that the Signal Input Range should be set post scale. What do you have defined as your signal input range, you're readings may be scaling themselves to the signal input range. With a coefficient value of 3.2, your range should be Max=32 Min=-32, since your device likely has a +/-10V range.
Hope that helps.
Regards,
Glenn

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Attachments:
PID while.vi ‏100 KB

My problem is the following. Both of the NI-DAQ I placed using DAQ Assist, require to be in a while loop.
-If
I place them in separate loops, I have the problem of passing
information between the Input NI-DAQ and the PID, and also between the
PID and the Output NI-DAQ.
This is the best option---Use QUEUE or Functional global or something else to tranfer the data to and fro
How do I make that QUEUE or Functional global?
-If I place them both in one big loop, an error occurs saying that the selected buffer size is too small (Error -200609).
Have
you tried increasing the buffer? Is the acquisition happening
parallelly (means to say the first DAQ not wired (error terminal) to
second DAQ)
Well the buffer is, at least how I understood it, the option Number of Samples when in Continuous Samples mode. Concerning the parallel acquisition, do you mean I should wire the error ports of both of the DAQs?

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