Hardware triggered digital acquisition

[tintin_99]

Hi,

I would like to measure frequency of rotation of an encoder after let's say bit number n of a known digita waveform is constant for 3 seconds. I assume I need to use counters to measure frequency but I don't know how I should use the trigger signal. Is there any example that can help me on this 

[Josh_E]

Hi tintin,

What kind of encoder are you trying to measure?

If the output is just a standard pulse train of varying frequency, you can use DAQmx functions to measure it.

Here's an example that will do just that.

https://decibel.ni.com/content/docs/DOC-13039

Good luck!