Hi,
I can't find anything on how to set up a DAQ to detect a contact closure. I have the M Series USB-6221. I'm not familiar with DAQ's or Signal Express so please include the basics when explaining stuff. Please help!
I have a fridge in the lab that outputs alarms via a contact closure. I want to record the activity of the alarm (when and how long it's triggered).
I thought I could maybe connect the 5V output of the DAQ to the contact closure and measure voltage on the DAQ but I took a multimeter to the 5V output and I'm not reading any voltage. Do I need to turn on the 5V output? I had the DAQ measuring temp from a thermocouple when I tested the 5V so the device was operating, not just sitting there idle. Do I even want to use the 5V output for this application?
The fridges alarm output has three terminals: Common, Normally Open and Normally Closed.
What do I need to connect to where?
Thanks,
Tony