04-04-2007 11:22 AM
04-05-2007 01:14 PM
04-11-2007 09:41 AM
04-12-2007 12:50 PM
Hello Mike.
I have tested the USB-6009 with that exact configuration and have not seen any ghosting on my channels. I connecting AI0 to the 5V source and AI4 to the 2.5V source. I also tried the combination of AI1 and AI5 as well as AI0 and AI1. All of these tests, when viewed in the MAX test panel, came back without any ghosting. It would certainly help if you had another USB-6009 and could test that one to see if there was a difference in the readings. Since I am not able to replicate the issue that you are seeing, I am starting to suspect that something may be wrong with the actual hardware. Running a test on your exact inputs with another 6009 would certainly shed more light on the issue.
Brian F
Applications Engineer
National Instruments
04-12-2007 01:39 PM
04-13-2007 12:17 PM
Hello Mike.
I have not done this test yet since I don't see why C code would give different results than what I saw in MAX. However, for completeness sake, I will test this today and keep you updated of the results I see.
Have a great day!
Brian F
Applications Engineer
National Instruments