PXI-5122 and PXI-6259 Read 2 Channel simultaneously

[Samuel_Clipsal]

There are one PXI-5122 Digitiser card and one PXI-6259 DAQ card in our PXI system, we are using Labview and TestStand (Batch Model) to test  multiply board simultaneously, sometimes upto 8 boards are tested. We do have some problems, such as test results not reliable and sometimes Labview lockup. Everything works fine when test single board. So, we are feeling that multiply channel data acquisition causing this problem. It is great if someone have similar problem and we can share the knowledge. My question will be as below:

1. If both channel have been configured,  will reading both channel simultaneous cause system lockup or data be corrupted?

    "niScope Read WDT.vi" is Reentrant,  we can use two subVi to call "niScope Read WDT.vi" to access both channel simultaneously.

2. If we configure one channel during another channel is reading data,  will this situation cause system lookup or data corrupted.

Regards

Samuel

[Steve_B · Accepted solution]

Hi Samuel,

You should not have any trouble reading from multiple channels on your 5122 or between your 5122 and your 6259. Are you receiving an error message when your test locks up? What happens when your test is not reliable? Is you data incorrect and if so what is the expected data vs acquired data? You should be able to define both of your channels into a single task, which would involve using a niScope Read WDT.vi to be used per device. Are you working from an example or have you developed your own code? What version of the NI Scope driver and NI DAQmx driver are you using? You can find the driver version number in Measurement and Automation Explorer under the Software section.

What type of test are you running? Is your PXI chassis controlled by a computer or by an embedded controller? Does changing the acquisition rate have an effect on your program?