Hi everyone,
i am using a PXI station with a 7841R FPGA and i am using the 5V with 250mA to power an external circuit. It worked good for over half a year but now SHC68M-68F-RMIO cable it was connected to had a short curcuit within. This broke the fuse on the FPGA. After i changed to fuse, the output voltage was back without load, but if i connect a 100Ohm resistor to it, the voltage reduces to 0V.
The next strange thing i noticed is, that not all DGND pins seem to be connected. When i measure the resistance between them, most show 0.1Ohm, but some show ~10 to 1MOhm. This was already present before the source voltage broke down.
Does this mean my PXI chassis and/or my FPGA are broken? Both are still fully operational, except for the voltage output and i need to connect my ground connections to the right pins, because some are not connected to ground although the user manual says so.
I have cross checked two chassis and two FPGA cards, all results are the same. Strange DGND behaviour and no +5V with connected load. Both cards were connected to the broken SHC68M-68F-RMIO cable before i realised it is faulty.
Are there any methods to check if the fault is with the chassis or with the FPGA?
Best regards,
Johannes S.
