From 11:00 PM CST Friday, Feb 14th - 6:30 PM CST Saturday, Feb 15th, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
From 11:00 PM CST Friday, Feb 14th - 6:30 PM CST Saturday, Feb 15th, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
04-10-2007 05:21 PM
04-11-2007 02:48 AM
04-11-2007 08:20 AM
04-12-2007 09:34 AM
Hi,
I’ve setup a similar system here, using a PCI-6251 and DAQmx 8.5, and I could not reproduce the behavior that you’re seeing. The time string is updated once per second. A picture of my block diagram is attached.
What device and driver version are you using?
Have you verified that your signal is truly 10Hz – could it be 20Hz instead?
Best regards,
Ed W.
Applications Engineer
National Instruments
04-12-2007 09:57 AM
Ed,
The Daqmx driver version is 8.3. I,m using PXI-6220. I verified the timming signal and i have 10Hz.
I talked with technical support from NI. While talking with your guys, i was trying different configuration and here is what i got.
In the example, The Active edge terminal on the Daqmx timming(Sample Clock) function is not wired(Default:Rising). I wired it with Rising as value; nothing chaged, the bug was still there.
Then, i changed the value to falling and it starts working!? I changed back to rising and still working!
I closed Labview and retry, everything is fine. I rebooted the PXI main frame, no more problem as well.
I find that disturbing, i did not expect such a behavior and i dont want that happen again.
Should i check for this problem while acquiring(Time consuming)?
Can i be confident enough that everything will goes right?
Any advices?
Regards,
Guillaume
04-13-2007 12:01 PM
Hi Guillaume,
It’d be very difficult to determine why you were seeing this behavior, especially since the problem is now fixed on your system. There are no known issues with this type of acquisition in DAQmx 8.3, so you can be confident that your system will work in the future.
Best regards,
Ed W.
Applications Engineer
National Instruments