10-20-2021 01:48 PM
Hello, I got two galvo mirror control boards which need analog signal from PCIe6363. I use the SCB-68A for wire connection. There are two AO channels in SCB-68A box and each channel has two screw terminals (AO+ and GND). But for each of my mirror control board, there are SIG+, SIG- and GND. How can I connect the wire terminals? Which mode on SCB-68A should I choose, the Disabled Temperature Sensor (Default Mode) or Enabled Temperature Sensor (Differential) mode?
In short, I don't know how to connect SIG+,SIG-,GND terminals to the AO1(or AO0) and GND in SCB-68A box.
I got a graph showing how I connected the galvo board and the SCB-68A.
Could you please help me to see if it is correct?
10-20-2021 04:25 PM
The correct info for your mirror board should be discoverable. If I had to guess (and I'm not recommending that you *should* merely guess), I'd venture that the GND for the mirror board might be meant as an earth ground connection, perhaps for safety purposes, and that SIG- would connect to AO GND on the SCB-68A.
-Kevin P
10-20-2021 04:41 PM
Thank you, Kevin!
I tried to connected the SIG- to the AO GND, and run the two channels AO Labview code as attachment. I found the mirror not behave a different wave setting and frequency as I set. Each mirror vibrated with a mixed frequency which means the frequency is not stable. Is that because the GND pin is not connected?
Thank you very much
10-20-2021 05:14 PM
I gave you an offhand *guess* about the wiring connections. You're going to need to research that further to verify.
I never use DAQ Assistants and have an automatic distrust of any code that relies on them. I would point you instead to shipping examples for AO that use regular DAQmx functions. Probably try each axis out individually, one at a time.
-Kevin P