Data acquisition using oscilloscope

[MichailM]

Hi,

I have available a NI-6351 with maximum sample rate 1.25 MS/s and an oscilloscope Lecroy WaveJet 354 with maximum sample rate 2GS/s. Is it possible to use the oscilloscope together with my LV code for data acquisition and take advantage of that much higher speed? Any hints are welcome.

KR,

Michail

[Gregory]

Did you already try the 3rd party driver from NI?

http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=81A06850A47F198BE04400144FB7D2...

[MichailM]

I did try it. At the moment I just managed to link the oscilloscope with my PC through a USB port. I will try to explain, as briefly as possible, what I am trying to achieve.

The oscilloscope has a trigger function based on the acquired signal from one of the four available channels. When this trigger is exceeded, a capture of all the signals shown on the screen is taken. Each capture can be saved as an image (png, tiff, etc.) and as csv/ txt file. Depending on the sample rate and data points set-up, there is a specific available space for captures (buffer). For example, when the sample rate is 1GS/s and 10k points (time div 1μs) the buffer size is 512. It is extremely time demanding to save all these captures one-by-one. Also, I want to record and save everything even when the trigger is not exceeded. Is such an option possible with oscilloscope/LV code combination? 

[crossrulz]

Unfortunately, oscilloscopes are not set up to do what you are asking for.  Even with autotriggering, you can only grab a full trace at a time; it does not stream data to you.  What sample rate do you really need?  There might be a DAQ out there that can go fast enough.

[MichailM]

I need at least 1GS/s. Oscilloscopes that I have currently available can reach that kind of speeds but since basic operating is based on triggers it is impossible to get what I describe. DAQ cards of that speed levels are quite expensive and lack of bit resolution.

I used a Teledyne Lecroy HDO6000 series and I managed to connect to it though TCP/IP. I built a simple LV code through which I am able to acquire the waveform I need. The code looks like the one below,

I use a concatenating tunnel so in Waveform Graph 2 I get the entire recordings. If I was able to store the relative time for every waveform I receive, I would be able with some post-processing to built the entire signal. For example, my oscilloscope receive the very first trigger, let's say, at 0s and I get a waveform which has a total duration of 10μs. After 100μs I have a second trigger which also returns a second 10μs waveform. In my Waveform Graph 2 I will see a recording that has a 20μs total duration. The ideal recording would be

10μs (first trigger) + (100-10)μs (time until second trigger) + 10μs (second trigger) = 110μS

Are there any ideas how can I record the trigger relative time?