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Electronics Explorer Board VP- Not Outputting Correct Voltage


I purchased an Electronics Explorer Board several years ago and used it a hand-full of times and it has since sat in a desk. 

I've recently been required to use it again for an electronics lab and have discovered it cannot seem to output negative voltages.


I have the board plugged into a 12 volt power supply and a usb plugged into a pc.

The board's LED lights up and the computer/waveforms recognizes the board correctly.

I'm running the current version of waveforms.

While running the scope I can measure VP+ correctly with whatever voltages I set.

When I attempt to measure VP- while set to a negative voltage WaveForms shows no current through VP- regardless of what I set the current to and the scope shows nothing on it.


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