I have a DAQ board connected to a multi-cal master board with two PGA0308 evaluation boards on the interface board.
All cables seem correct
I have them set for 4 wire voltage mode, and I select the 4 wire voltage mode model in the software.
my supplies are on, the +9V to the DC jack, the USB is plugged in, the
15/-15V and 5V that supplies the DUT and these are supplied to J9 on the multi-cal master PCB
Under the debug tab, I play with the mux setting, and the corresponding LED's light up, and under the debug tab I can affect dut power LED on the DAQ board with the GUI switch.
but when running the "test" or the "calibration" TAB my modules always report in the window "communications error"
I can't find a full schematic to the multi-cal master board, only the user manual.
When under the debug tab, I select the mux and the LED lights. but the opto-relays on the slave do not pass
DUT power (+5V) to the DUT's (my PGA0308) module. The LED side of the opto's are not being brought to ground to turn the
opto relays on.
I am suspicious that the I2C or something else isn't working. I have not yet gotten out my scope to start probing I2C local to the DAQ board (hey it's the weekend!)
But I am sure something is simple wrong that I am over looking, a jumper setting someplace?
Also, is there a power supply sequencing that is recommended?