Logging data for single channel impact measurement

[sound and vibration]

Hi Everybody,

I am using USB 9233 and is not support analog start  and stop triggering ( i couldnt use impact test example). I want to log the response data for single channel impact measurement. However, there are certain examples in labview but none supports to  stop acquring by software. This example has the software triggering
http://zone.ni.com/devzone/cda/epd/p/id/34      but not to stop. This question may be ridiculous to post. but can anyone help me to solve the problem.

Thanks

Pasu

[DanBrowne]

Hi,

The only way to implement a stop trigger would be write one into your program - since the 9233 doesn't support analog triggering in hardware. So you would need to implement some sort of threshold function whereby once the impulse level returns to within a certain value (e.g. something similar to the value being read in before the impact), the VI stops acquring the data being read in after the original pre-trigger samples, and the impact samples aswell.

I hope this helps, Regards,

Dan