how can i generate a 80Mhz clock and feed to the Source input of the counter?

[Ivan_Chen2012]

Hi,

I want to make a Two-Signal Edge-Separation Measurement with NI DAQ :PCI 6224. As I look to the user manual of the M serials DAQ.

I get a solution as below:

 

As show in above, it needs to have a timebase clock to feed to the source input of the counter.

I also understand that the DAQ can gernerate 80 MHz, 20 MHz, 0.1 MHz  Internal base clocks.

My questions are:

Can i route this Internal base clocks out to one pin of the DAQ connector and then connect it to the source input of the counter?

how can i get this  timebase clock?

What is the pin number of this clock coming out? I will need this information to make an interface board.

[Ivan_Chen2012]

Anyone know about it?

[Ivan_Chen2012]

Any one could help me out?

[Ivan_Chen2012]

Anyone familiar with the DAQ counter?

[Kevin_Price]

Have you experimented and tried examples?   Normally, the appropriate internal timebase clock will be routed to the counter source input automatically, without need for any external wiring work.  DAQmx uses the expected min and max times you define for the two-edge separation task to select one of the available internal timebases and then routes it to the counter source input.  Keep in mind that there will be a tradeoff between timing precision and max delta time because you can only get 32 bits worth of counts before the count register will roll over.   At 80 MHz, the counter rolls over in just under 1 minute.

Hopefully this means you don't actually need to connect the timebase clock to an output pin because I don't think that'll be possible, or at least not for the faster timebases.

-Kevin P

[Ivan_Chen2012]

I got it.Thanks a lot!

The DAQ card is on the customer site. so i don't manage to have a try.