Analog Sample Clock Division

[Tom_W_[DE]]

Hey Drew-

Sorry it has taken so long to get a reply- your message fell through the cracks because our support teams were likely never notified about it.  I would suggest creating a new forum post if my suggestions don't help so that they can devote some time to helping with your specific question.

If I understand your problem correctly, I believe you should be able to use the 'ticks' counter channel type to achieve this sample division.  You can specify a high-time/low-time in ticks of as little as two ticks for each state.  This should allow you to achieve your divide-by-two need.  The one caveat is that you will have to route your external signal to a PFI line as well, as the APFI lines are not routable to other internal digital circuitry.  Here's a screenshot of what it might look like:

For your digital task, you would then just specify the sampleClockSource as one of the counter internal outputs, like this:

Hopefully this helps-

[Kevin_Price]

I'd add just one thing to Tom W's post.  You'll probably also need to use a DAQmx property node to change the output behavior of the counter.  By default, it will toggle the output state every 2 cycles of the incoming timebase clock, which becomes a divide-by-4.  There's a property you can set to request it to pulse on terminal count which can be used to perform a divide-by-2.

I'm not near LV now, but here's an older post I made on the same topic for a little more info.

-Kevin P

[Tom_W_[DE]]

Here's the property that Kevin alluded to:

 

[John_P1]

For anybody else who comes across the thread, the following example code can be used to divide an external clock by 2:

Divide External Clock by Two Using Counter in DAQmx

Drew's post was also discussed in this thread.

Best Regards,