Steven
Thanks for the reply. I have done some more testing as you have asked. I realized I actually have 11 PXI-2575's, recently purchased 2 spares, and 3 more for new test equipment. They are all used in an identical manner.
We have made a total of 3 purchases. The first was for 6 PXI-2575's, the next was for 2 (spares), and the final was 3. With all of the swapping around, I am not sure where these failing ones came from at the moment, other than to say they were not part of the most recent purchase of 3. I am more than happy to provide serial numbers, if you can tell me which of the stickers on the board is the serial number. There are two identical looking stickers, one on each of the boards, that have different serial numbers on them.
Below is the data I have collected. Cards 5 & 6 can be considered "good" cards. Note that their readings did not change from their initial readings. They are from the most recent batch. We have no examples of cards with lots of cycles on them that do not exhibit this behavior. Prior to attempt 1 the cards had been powered off and removed from chassis anywhere from days to months. Between attempts 1 and 2 several switch cycles were performed and power was cycled on the PXI and the PC.
*All readings are in Ohms.
Below is a diagram of the setup I am using to test the switch matrices after they fail in the field.
Installing a new PXI-2575 immediately resolves the issue in the test set, and that test set continues to work for another several months.
Any help would be appreciated.
Thanks
Jonathan Rice