Acquiring 4 traces (simultaniously) from Lecroy Wavesurfer with LabView 7.1

Hello everyone
I am actually using Labview 7.1 to acquire the data from my Wavesurfer 454. I can do it for one trace. It look like this “armed” the scope then when it gets the trigger, Labview collects the data.
The problem is I would like to collect the 4 traces after only one trigger… is it possible? Could you please explain me how to do that?
Because if I use a loop and change each time the channel to acquire, I need 4 trigger... although I would like to acquire them from the same trigger...
Many many thanks!
Sebastien

Hello,
Alan from LeCroy Tech Support here...
I recommend using the "lcwave" driver that's on NI's Instrument driver network. It includes an example for reading out multiple waveforms (2 channels)that can easily be extended to readout all 4 channels. To find the driver quickly, go to http://www.lecroy.com/tm/Library/Software/LabView/LabViewDrivers.asp?menuid=8 where you will find a link to the driver on NI's website. Let me know if you have any problems using the example.
Best Regards,
Alan
Alan Blankman, Technical Product Marketing Manager and LabVIEW Developer
LeCroy Corporation
800-553-2769 x 4412
http://www.lecroy.com
[email protected]

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Hi - Alan from LeCroy Tech Support here...
Let's start with the 10mV/div setting. With a signal that is 25mV peak to peak, you are only using about 31% of the scope's full scale range. (31% = 25mV / (8divs * 10mV/div). When you change to 50mV division, you are only using 6% of the full scale range. The resolution drops in the same way; the scope is an 8 bit digitizer over the full scale range. 31% of this range is = 0.31*255 = 83 levels; 6% is only about 15 levels. This is what you are seeing in your images; the volts per ADC code increases by a factor of 5 when you change the gain from 10mV to 50mV. Since your signal is small compared to full scale, you don't have much resolution. In general, you always should use as much of the grid as possible to get the best resolution. See LAB WM308 for more information and examples: http://www.lecroy.com/tm/library/LABs/PDF/LAB_WM308.pdf
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Acquiring 4 traces (simultani​ously) from Lecroy Wavesurfer with LabView 7.1

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Acquiring 4 traces (simultaniously) from Lecroy Wavesurfer with LabView 7.1