05-15-2014 02:54 PM
Hi all,
This is a pretty simple question. For a PFI trigger input on a DAQ card, is there a common maximum voltage that the card can handle? if so what is that voltage?
Thankyou!
05-15-2014 03:05 PM
Guess what is written in the specifications?
06-12-2014 10:50 AM
It is designed to be a 5V ttl or cmos signal. With a bit of overhead, but i would not repeatedly rely on the card to handle overvoltage. Put a 5V zener diode across the input (and a series resistor to drop the current). That can protect against almost anything for a few pennies. If you get to kV there are other things to prevent arcing.
For a few hundred volts, a 10KΩ resistor and 5V zener for a fraction of a watt will solve the issue and protect your hardware cheaply.