Luis,
In the interest of moving forward I realized the system verifies communication and configures the attached PGA309's before proceeding to the calibration steps. I connected my PGA309 PCB's to the Multi-cal system to verify this function on all channels. I noted that channel "4" had a communication error. While diagnosing it. The same error popped up on channel "8" during the diagnosis of the channel "4" comm error. When I restarted the program Channel "8" started working. Then after some more time diagnosing channel "4" the communication error popped up on channel "6". All my devices were verified with the USB DAQ platform individually before I started using them with the Multi Cal system and I know they work fine after a number of calibration cycles. Also, I changed out the PGA309 pcb on channel 4 to one that worked in another channel just to be sure, still the same error. I probed both the "Pos" and "Vout' lines at the breakout board. The failure is the power isn't coming on to the channels that register a communication error. I probed the "On-to-vout Ctrl" test points on the Mux board and found that the ones that were working were cycling to 5v and the channels with comm errors were not. My 5v Vdut supply has plenty of current handling and is not drooping. I'm not sure what would cause a random problem like this nor do I understand why logic outputs would just stop and start working (Thats at least in the case of channels "6" and "8". Channel 4 has not powered up so far.) When the "On-to-vout Ctrl" test points signals are there, they rise quick and to full logic levels no sagging or slow rise times. When they don't, they just remain at ground.
Again any help is appreciated!
Joe
