6251 Counter input signal

[crimolvic]

Hello,

I am acquiring pulses which are 0-5V with the counter of the PXI 6251. However, I would like to know if it is possible to acquire pulses that are, for example 0-12V or 0-24V without damage the device. In other words, which is the voltage range for the counter input in a PXI 6251?

thanking in advance,
CJMV

[RamonaL]

Hi!

If you watch the specification, you can see, that the counter has only TTL Logic. Every voltage which is higher can damage you device:

http://sine.ni.com/nips/cds/view/p/lang/en/nid/14125

There is no possiblility to connect higher input voltages.

Greetings,
RMathews

[Abhinav T]

Hi,

You will not be able to use the counter directly but you can setup an analog level trigger for your signals. This will create a pulse that isTTL compatible  for you everytime the signal crosses a particular level. Then you can route this into your counter and perform any counter measurements on it. An example is this is shown here where it sets up a level trigger to make frequency measurements.

Alternatively you can purchase an industrial strength digital I/O board such as the USB-6525 but this does not include a counter.

Please let me know if this works out for you.

Message Edited by Abhinav T on 07-06-2007 05:20 AM