start - stop with two daq counters

[klaus65]

I have the following problem:
I have two channels. One channel consist of one ttl pulse, repeated with a frequency nu1. The other channel consist of two ttl pulses (with a certain distance in time deltat1= (B-C)), repeated with a frequency nu1.
The scheme below should help to visualize
......][......A....................][.....
......][............B....C........][......
I would like to measure the time difference B-A, and C-A.
Is there a simple way to do that using the counters? I have a DAQ card of NI with two counters on it and LV 6.0. Any suggestion would be greatly appreciated.
Thanks you a lot
-Claudio

[RamziH]

Hi,

What you need is 'Two Edge Seperation Measurment', and this is only available on a NI-TIO based devices (660x family). This can not be achieved with the card you have - I assume it is an E-Series card. There is a shipping example that ships with LabVIEW 6.0 that would measure edge seperation (Two Edge Seperation Measurement (NI-TIO).vi).

Regards,
RamziH.