Spectral analysis with 10 averages using 10 lvm files

Hi
I would like to create a spectal analysis of some results i have saved in lvm files in labview 7
is it possible to use the averaging option in the spectral measurement function to do 10 averages if i read 10 lvm files
ie.
Read lvm file #1
do spectrum analysis
read lvm file #2
redo spectrum analysis and average results between file #1 and file #2
read lvm file #3
ect
Thanks in advance
Mark Thompson

hi there
you can swop the order of calculating the average and the FFT. So first read all lvm files, average the time based data and then do the FFT over the averaged data.
Best regards
chris
CL(A)Dly bending G-Force with LabVIEW
famous last words: "oh my god, it is full of stars!"

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Borges -
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Sorry for the late reply. I was out of the office Friday.
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C:\sw\dev\T4\windows\Src\kernel\vbd>msbuild.exe cht4vbd.vcxproj /p:Configuration="Windows 8.1 Debug" /P:Platform=x64 /P:RunCodeAnalysisOnce=True
Microsoft (R) Build Engine version 12.0.21005.1
[Microsoft .NET Framework, version 4.0.30319.33440]
Copyright (C) Microsoft Corporation. All rights reserved.
Build started 4/7/2015 12:08:30 AM.
Project "C:\sw\dev\T4\windows\Src\kernel\vbd\cht4vbd.vcxproj" on node 1 (defaul
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"C:\sw\dev\T4\windows\Src\kernel\vbd\cht4vbd.vcxproj" (default target) (1) ->
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c:\Program Files (x86)\Windows Kits\10\build\WindowsDriver.common.targets(355
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c\kernel\vbd\cht4vbd.vcxproj]
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C:\sw\dev\T4\windows\Src\kernel\vbd>msbuild.exe cht4vbd.vcxproj /p:Configuration="Windows 8.1 Debug" /P:Platform=x64 /P:RunCodeAnalysisOnce=True
Microsoft (R) Build Engine version 12.0.21005.1
[Microsoft .NET Framework, version 4.0.30319.33440]
Copyright (C) Microsoft Corporation. All rights reserved.
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Could not open version header file c:\Program Files (x86)\Windows Kits\10\Inc
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c:\Program Files (x86)\Windows Kits\10\build\WindowsDriver.common.targets(355,5
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Problems with displaying read data from a .lvm file

Hi all.
I aquire data with the PCMCIA card 6036E. I aquire online in Labview 7 and store the data in a .lvm file. When i try to display the same data i aquired before with the "read .lvm file" express vi, the waveform chart redraws itself after an undefined time, sometimes it redraws faster and sometimes it takes longer. WHY? i have only one header per aquisition and if i restart the aquisition a new file is written! I tried almost everything. Is this a bug from labview 7?
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Bernd

Hi Khalid,
Here is a simplified version of my VI and also 2 .lvm files from the logged data. Sorry for the size, but I aquire with a sample rate of 20 kS/s and my main frequency is only 0.3 Hz. In the 6MB file I aquired a little more than 3 periods. When you run the VI with this file at the beginning it redraws very often and very fast, then after some time it draws about 1 period and then it redraws again and so on. I want that the hole data from this file is displayed at once. The 900kB file is aquired with 10kS/s and about 1.5 periods. This is the last size the displaying is working with. You think it is possible that the VI only works until 1MB? But my data usually is much bigger than that. I hope you can use the data because it is
zipped, but otherwise it wouldnt be possible to post it.
Thank you very much for your help, I really appreciate it!
Best regards,
Bernd
Attachments:
simplified_VI_for_offline_data_display.vi ‏79 KB
2004-07-01_Messung9.zip ‏191 KB
2004-07-01_Messung4.zip ‏680 KB

Spectral analysis with 10 averages using 10 lvm files

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