Missing voltage on 2 ports | LabJack

Missing voltage on 2 ports

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speechsupply's picture
Missing voltage on 2 ports


I recently bought an U3. Until now I have been using a separate voltage supply. Now I realised that VS and GND for FIO2, FIO3 and FIO0, FIO1 is not working. The other VS and GND points are working just fine. Any ideas why that is?


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labjack support's picture
I added some new text to

I added some new text to Section 2.4 of the U3 Datasheet.


What if some VS terminals are not working?  We hear this every so often, but since the terminals are all simply soldered into the same VS plane on the PCB is is almost impossible for some to work and some not.  Almost every time the actual problem is improper use of the screw terminals.  The only guaranteed connection with the screw terminals is when a conductor is securely clamped inside the terminal.  For example, touching DMM probes to the screw head of a loose terminal rarely provides a valid contact.