Analog Discovery 2 Negative Voltage

[brandonsss]

Hello All,

Quick question about the AD2 Wavegenerator and oscilloscope functions. I was using the function generator to apply a positive and negative voltage to the same node and instead of the voltages cancelling the positive voltage dominated. I was wondering what was causing this effect.

 

Any help would be greatly appreciated.

 

[attila]

Hi @brandonsss

The Analog Discovery Wavegen outputs have zero output impedance and current of 10-50mA.

You have shorted the two outputs and the positive rail came out as winner.
Use some series resistors like 1k to limit the current, W1->R->SC1+->R->W2

[brandonsss]

Hi attila,

 

That works, thank you so much! Didn't realize I changed the resistance jumpers on the BNC adapter board.

 

Brandon