Threshold Detector Can Detect?

[Researcher]

I have been trying to use LabVIEW for Analog Input and Digital Output at the same time. Briefly, I want LabVIEW to measure the impact force first and then send Digital Output to activate an external device when input data pass the threshold.
However, the peak detector can not detect signal beyond the threshold. I guess that very short rising time(5 ms) of analog input is the reason for that. My sampling rate is set at 1500 samples/sec. I thought that all analog input signals are compared with the threshold. However, It seems not.

Are all analog input signals compared to the threshold or only one data is compared per second?


Thanks

Andy Baek

[BrandonS]

I am a little confused why you say the peak detector can not detect a signal beyond the threshold.

Are you saying that the time resolution of your signal is not enough to detect the threshold. At 1500 samples/sec you time resolution is 0.7 ms. So, even with a very short rise time you should be able to get between 5-7 samples. If it is a problem with detecting the threshold you might need to play with both the width of the peak as well as the threshold value. A little more information on what you are trying to say be helpful.