I need to acquire waveforms(traces) in the single sweep mode from two channels from LeCroy scope 9450A via GPIB using Labview 6.1 and an NI PCI-GPIB card.

[digital]

I've already downloaded the lc9420 driver for Labview from the NI website. So now I would like to acquire and save traces of the two channels in the files each time the trigger mode changes from AUTO mode to single mode. No data acquired when trigger mode changes from single mode to Auto mode.

Could you please tell me how can I do this ?

Any help would be greatly appreciated.

Regards,

[Labviewguru]

You should be able to get a manual from lecroy that indicates how to do what you need. If the primary manual doesn't contain the GPIB commands, then you should be able to get a programming manual.

Otherwise, the Instrument Driver VIs should contain exactly what you need.

Try this: Setup your measurement on the scope, not all the settings. Then, translate this into the same commands available through the instrument driver VIs.