Synchronised DAQ with 2 PCI-cards

[felix]

Hi folks,

we want to use two (2) synchronised PCI-6071E DAQ cards in one PC. At
the moment we use software triggers. Is it possible two get the
software trigger for device 2 from device 1? Or do we have to use an
external trigger what is not impossible but it needs more work? Do any
DAQ vi exist for two DAQ devices?

Thanks for help, Felix


Felix Tiefenbacher

Swiss Federal Institute for Snow- and Avalanche Research
Avalanche Dynamics
Fluelastrasse 11
CH-7260 Davos Dorf

Tel: +41 (0)81/417 02 53
Fax: +41 (0)81/417 01 10

[mikeporter]

Software triggering in this case might be possible, but the better solution is to start things with a hardware trigger. Any computer running a commercial OS will have varying amounts of latency that will make reliable software triggering problematic. What's more, the faster the event is that you are trying to capture, the worse the problem gets--and sliding snow is very fast.

I understand that external triggering is more work, but you get much better results. Also the only tricky part will be generating the trigger. The code for a hardware triggered acquisition isn't any more complicated than software triggered code.

Mike...