DAQ Sample Rate vs. Labview Signal Express

[DanFisher]

Hello.

I am currently running a two analog input system and taking data over the course of an event. This event happens in the span of approximately 4 ms. Even though I set my sample rate to something above 1 kS/s, the output in Labview always shows each voltage spike occuring over 1 ms.

Does anyone know how to change these settings in Labview Express? Or could this be a sensor/DAQ issue?

[Eric_NI]

Hello DanFisher,

What is the harwdare in use, have you checked the behavior of the signal in the MAX(Measurement and Automation Explorer) test panels? Is my understanding correctly if I say that you are seeing the spikes even though they are actually not happening?

Regards,

Eric NI

[DanFisher]

I am using 2 OMRON photoelectric sensor. They output a DC votage of approx. 1.4 V when idle and 6 V when triggered. No matter what sample rate I set the DAQ to, both the triggered event and the changes in the noise all occur over 1 ms intervals. That is the "slope" of the graph occurs over a 1 ms span. By setting the sampling rate higher, I should be able to see changes every .5 ms, however, this is not the case.

I hope this was a better description of my issue.

[Eric_NI]

Hi DanFisher,

Can you post an screenshot of the acquisition part of your program? That would help clear things up.

Eric NI