Plotting data from two instruments at different rates

Hi,
I have a VI that reads temperature from a multimeter using VISA and acquires image from a IR camera via IMAQ. Each acquisition process takes place in an independent while loop; each with its own frequency. From the IR image I get a pixel value which is converted to temperature.
My problem comes when I try to plot both signals (temperature from the multimeter and from the pixel in the IR image)in one chart. Just merging signals doesn´t work. I have embedded the multimeter section in the "while" loop corresponding to the image acquisition. This works, but speed is limited by the multimeter, which is very slow (approx. 1.5 Hz)
I would like something like this: if I get 50 images and 1 multimeter reading
in a certain period of time, set up some kind of buffer so that the 50 values from the camera are plotted as well as the one from the multimeter reading repeated 50 times. I´ve tried resampling but to no result.
Sorry if something is not quite clear, please tell me if I should be more specific. Thanks in advance for your help
Alberto Foronda

Try putting the data from each souce into a waveform (see the waveform pallete). Make sure you write the t0 of the waveform. Do this for each reading, and then build an array of these waveforms and then present this to your chart.
THe Chart will use the t0 of your vaeform to plot your data. It will not matter that the time are different, that chart will figure that part out. If you have data from your camera but no new reading from your multimeter, just make sure the waveform for the multimeter has an empty "Y" array. This will plot the camera data but it will leave the multimeter trace alone.
Trying to help,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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