Triggered capture with tektronix scope

[shredderofmass]

I have a tektronix  DPO 4054 digital scope. I need to capture a signal while a trigger is high. So when the trigger goes high it continues capturing until the trigger goes low again. Has anyone done this through labview. If I can get that working I need to access its math functions to integrate the wave form. First things first, I need the trigger function as described. Any thoughts?

[Dennis_Knutson]

Not at all sure what this has to do with LabVIEW. Does the scope actually have this sort of trigger feature? If so, you should first be able to do the capture manually and then you can find the trigger command in the manual. You'll also want to make sure the scope has enough memory to store the waveform. This will depend on how long the trigger condition lasts and your capture parameters (i.e. sample rate).

[shredderofmass]

It was my initial understanding that the scope could do this. There are extensive labview libraries for this scope. Though I could not find any examples that addressed this triggering scheme. Since I can't be in the room when the experiment is occuring, I need to remotely command the scope to capture the exact right amount of data then make the scope perform math on it. A NI card is not an option because of the speed of the capture. But it has to be a labview remotely driven system.

If I cannot get the trigger scheme I am looking for I will have to acquire and view sample waveforms remotely, and trust that a preset duration of capture will be close enough to what I wanted. So I will start by viewing events remotely until I find the 'samples per second' and 'sample duration' that will work, then set the scope to 1) sample events, 2) perform math on events, 3) send results of math to control computer through labview, 4) rearm.

This works if the events are sufficiently similar. It would have been nicer to have the scope only capture when the trigger is high. 

[Dennis_Knutson]

I think you are going about things backwards. Instead of trying to search the driver for an example, search the manual to see if this trigger mode is supported and then search the manual for the necessary commands. If you find something, then you can use the search function to see if there is support in the driver. There is no guarantee that each and every function is supported in the driver. If the mode is supported, it should be simple enough to modify the driver.

Another approach would be to contact Tek technical support to see if the trigger mode is supported.