problem on PXI6225

[alanxie]

I have a PXI 6225 card with chassis system. There is a strange problem on this card. I open up the test panel of PXI6225 from MAX. And I try to test a few AI channel randomly. I picked up AI1, AI3, AI8. And I mannually apply some DC voltage on these channels. On the test panel, I choose one channel at a time, and choose one-time on-demand measuren with RSE mode. To my surprise, only AI8 work fine. AI1 and AI3 seems to add an offset to the actual voltage applied. For example, if I apply 0V on AI1 or AI3, it shows 3.5V. If I add 1V on them, it shows 4.5V, etc. Any idea on what is going on? Did I miss some setup to make it work correctly? Thanks.

Tieling

[Christian Mergl]

Hey,

You could use the DAQmx Diagnostics Utility to check the card.

Thanks,

Christian

[alanxie]

Hi,

In MAX, there is a selftest button for each device. I run that selftest for 6225. It passes. Does it mean it could still have problem on the card even if it passes the selftest? Thanks.

Alan

[KyleTTU]

Hi Alan, 

The selftest is meant to solely communicate with the devices EEPROM and verify that it can communicate with the driver.  This is not a full test for the devices full functionality.  How do you have these voltages wired into the device?  Are you trying to read multiple channels simultaniously?

[alanxie]

Hi,

I just apply a static voltage to that channel through a connector cable (SHC68-68, that is the accessory we bought). I only test one channel at a time. Any suggestion why it does measure the correct value?

Thanks.

[Christian Mergl]

Hey,

Did you allready check with the diagnostics utility?

Christian

[alanxie]

Have not got a chance yet. But will do it probably next week, and then give you an update. Sorry for the delay because of tieing up with other stuff. Thanks.