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trigger and compare waveforms then write to file

I am trying to make a coincidence between two channels without using a SCA.  I have a Tek DPO 7104 scope where I have two PMT's connected.  PMT1 is on channel 1 and PMT2 is connected to channel 2.  I have my current vi setup to trigger on channel 1.  I generate a waveform that has both channels in the waveform data.  My goal is to make a comparsion between channel 1 and channel 2.  If channel 2 is "similiar" to channel 1, then write to file.  If the two channels are not similiar then do not write and go back and wait for another trigger.  I am thinking of using the "index array" to extract each channel seperately.  The next part would be to make a comparison somehow.  I was hoping someone might have an example that would help me to accomplish this.  I have been reading the post but I have not found an example that will assist me.  I would really appreaciate some help.

 

Chad

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Just in case someone stumbles across this in the future, this discussion moved here:

http://forums.ni.com/t5/LabVIEW/waveform-comparison/td-p/1158717

Justin Parker
National Instruments
Product Support Engineer
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