I am using LV 8.5 and the USB-6009 DAQ board. I have two basic questions one related to counting edges the other with how to best handle multiple acquisitions using one board.
1. I have a proximity detector that I am using to detect the presence of a pump handle. The idea is to count the number of times the pump handle moves back and forth. The USB-6009 has one counter (PFI 0) which I was going to try to use for this. In the LV example finder there is a VI called "Count Digital Events". I have tried the VI and simulated a signal by simply connecting a piece of wire to the PFI 0 terminal and then touching the wire to the ground terminal of the DAQ board. However, the count is never a single increment. Usually the count jumps by quite a bit. Also, the count increments when I touch the wire to ground and when I pull it away. I do not really understand this behavior.
2. Also in my system, I need to montior pressure and flow. I have sensors for this that generate an analog output. Is it possible to have my counter running (at a high sample frequency) and to monitor these analog signals (at a lower sample frequency) on the same DAQ board without cause a conflict?
Thanks.