When to compensate for and win on a PXI-5122 niScope change?

In my application, I use the niScope VI Fetch (I16 2D) to extract a multi-record, multichannel on a PXI-5122 digitizer acquisition.  Trying to optimize my code, this has led me to this question.

I am taking 32 successive acquisitions and adding (on average) all waveforms.  According to the notice in the scale and standardization of binary data, I first apply the parameter wfminfo.gain to data I16, sum which, then apply the offset.  MATLAB-like pseudocode for my Labview code, it is something like:

sum = zeros (1,1000)

offsetsum = 0

for i = 01:32

    [wfminfo, samples_i16] is niscope_fetch_i16 (...);

    samples_float = wfminfo.gain. * float(samples_i16[0,:]);

    Sum = sum + samples_float

    offsetsum = offsetsum + wfminfo.offset

end

Sum = sum + ones (1,1000). * offsetsum

So my question is whether it is prudent to assume that the wfminfo gain (and offset) settings remain constant for the duration of a session of acquisition (since time niScope Acquisition throw is called until the moment where the acquisition completed)?   The reference above on normalization coefficients indicates that these coefficients are a function of resolution and vertical calibration settings.  That would allow me to move the multiplication of gain outside the loop of the acquisition and perform arithmetic on integers.  It's a safe assumption?

Hi Gregory,

We tested this here, and you should be able to pull these gain and offset parameters before the while loop is entered and the arithmetic operation later outside of the loop.  To do this, you can place a niScope get Wfm Coefficients VI before the while loop, set it to obtain the Coefficients of standardization and route those elsewhere, because they will remain constant over the acquisition.

Tags: NI Products

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