Capture data and store it in a spreadsheet file

[koolnaal]

Hello,

I want to capture the waveform data from the scope TDS 744A for a specific period of time after a certain interval of time the trigger occurs, store it in a spreadsheet file and then plot the data points in the excel spreadsheet automatically. The trigger should occur as soon as the scope sees some input and after a specific period of time the data is captured and ploted on excel spreadsheet. Can you help me to do this.

[mikeporter]

I'm not familier with the scope you mention, but concerning the excel processing have you checked the excel examples that ship with LV?

Mike...

[BillMe]

Sounds more like an instrumentation question. You need to take a closer look at the TDS 744 programming reference manual. I've used the 740 series and I know you can pull the traces into LabVIEW using the driver.

[koolnaal]

Thanks.

I used the driver VI of 744a to capture the waveform data from the scope. Now, the problem is that I have an arbitrary signal waveform displayed on the capture. I want to trigger the scope at the time when the signal remains say around +-2V of zero(or any arbitrary value say x) for more than 2 ms. I don't know how to generate a program which triggers the scope when the following conditions are met. I am not from a programming background but can you please guide me or help me to develop such a program? This condition occurs during line drop out or when the amplitude of the supply line is clipped.

Regards,
Koolnaal

[mikeporter]

I'm sorry that I don't hav experience with your specific scope, but in general the GPIB commands mirror the operation of the manual controls. If you know how to set up the triggering on the scope manually look for the GPIB commands that do the same things. If you are still having problems in a couple more day and no one is responding to this thread you might want to repost the scope-specific portion of the question being sure to mention "Tek 744" in the subject line. That will increase the likelihood of someone who knows that instrument spotting the problem.

Mike...

[Dennis_Knutson]

I think you have more of a hardware solution than software. Investigate the various triggering options with your scope. If you can get it to trigger on your event, all your software has to do is wait for the scope to assert SRQ and then do a waveform fetch. I would recomend you experiment with the scope manually before attempting any type of automation.