Unwanted automatic trigger on TDS5K, Labview

[uribarri]

Hi all,

I'm using the tktds5k_32.dll library of functions in Labview 7.1 to download waveforms from my TDS5054 scope.  The whole process works beautifully, except that when I use Labview to control the scope (as opposed to using the scope alone) I get a spurious trigger signal from somewhere (presumably in the software) every 10.5 seconds.  This means my data folder fills up with mostly nonsense waveforms. My own software contains no timing at all (it just deals with the waveforms once downloaded), so my guess is there's some timing I can't see somewhere in the library functions.  Anybody experience this before or have suggestions?

Thanks.

[Andy F.]

Are you using the IVI or Plug and Play driver for LabVIEW?  I downloaded and installed the IVI driver from our website (below) and was looking into the calls that the VIs make and they do indeed eventually call the a similar driver to one you described.  However, if you use this install you should be able to have control over when the trigger signal is sent, and may be able to avoid the triggering every 10.5 seconds.

http://sine.ni.com/apps/we/niid_web_display.drv_results?p_app_area=&p_man=tektronix&p_keywords=tds+5...

Hope this helps!

Andy F.