USB-6008 stability

[hellolv]

Hi,

I am running a long-term code using USB-6008 as the I/O interface.  Acquiring data at 1kHz from 3 different analog inputs.

It runs for about 24 hours then couldn't see the inputs if left running.  After selecting different tabs on the front panel the inputs were seen again, but only for a few seconds then went all dead again.

There was a similar issue when using same device but with DAQmx Base(I am using DAQmx) and it seemed to be about multi-threading.

Can anyone shed some light on this?



hellolv

[Brian F.]

Hello. 

Thank you for posting to the NI Discussion Forums. 

This seems like a fairly odd error and I would like to isolate it between a software issue and a hardware issue.  So, the best troubleshooting step would be to simulate a DAQ device to see if the problem is with the graph or with the hardware.  This can be done in MAX by right clicking on NI-DAQmx Devices>>Create New NI-DAQmx Device>>NI-DAQmx Simulated Device.  Here, you can simulate most DAQ cards except for some of the USB devices including the 6008.  So, I would recommend simulating the PCI-6251, which is an M Series device. 

Then, simply modify your LabVIEW program to reference the resource name of the simulated device and then run the LabVIEW program.  If we get the same behavior with the simulated card, we can be confident that it is a LabVIEW issue and not a hardware issue. 

As an additional question, what type of display are you using that fails after 24 hours?  Is it a graph? a chart? something else?

Let us know and we will be happy to help.

Brian F
Applications Engineer
National Instruments