Why does my infinite pulse train stop early?

[cwierzynski]

Dear Community,

I have a pulse train task running on counter 7 of a PXI-6608.

The source is the oven-controlled stable 10MHz clock, which is passed to it over RTSI2. The Gate is constant low.

It's supposed to be high for 5e7 ticks, then low for 2^32-5e7 ticks. I.e., high for 5 seconds every time the 10MHz clock completes 2^32 cycles.

It runs fine for 56 hours, and then stops (no more pulses). Is there any reason why this would happen?

My vi uses the old NI-DAQ drivers.

Thanks!
Casimir

[TheWoost]

Hi Casimir,

That is strange behavior that you are seeing.  Is the 56 hour run time consistent, or is there noticeable variation from one run of your application to the next?  Are there any errors thrown by the driver when the pulse train stops?  Are you using an embedded PXI controller or an external PC via MXI?

Regards,
Andrew W
National Instruments