How I can measure frequency of TTL signal without external clock?

[Yuta K]

Hello,

I want to measure frequency of TTL signal using PXI-6254 or PXI-6713, without using external clock.

Frequency will be up to 100kHz. How I can use internal counter of 20MHz or 80MHz?

[Peter_Schutte_NINL]

Hi Yuta K,

You have not stated what software you want to use for this measurement, but in case you're using LabVIEW, please go to the Example Finder (in LabVIEW go to "Help >> Find Examples"). 

In the Example Finder, you make sure the "Browse" tab is stil selected, and than you go to:

Hardware Input and Output >> DAQmx >> Counter Measurements >> Digital Frequency

Here you will find some good examples of measuring a digital frequency with 1 or 2 onboard counters.

If you need additional information, please let us know!

Best regards,

Peter S