Wow, that is a great explanation. I didn't think about the affect the probe was having on the input to the voltage regulator. I started measuring other voltage levels downstream from the LM317 while measuring the output of the voltage regulator and it stayed at a constant voltage as expected. Thanks...

There is probably more than one mistake on the schematic, but the obvious one I just noticed is the R4 resistor is not a 680 kOhm resistor, it is just 680 Ohms. Otherwise that wouldn't work with the 5 volt output.

Hi, Thanks for the help. I have conducted the tests as you described and have attached the two captured waveforms. Unfortunately this also shows the same behavior as described before. The circuit I am running at the moment is just a voltage regulator (LM317) setup to provide a little more than 5volt...

Thanks for the suggestion. In the original test I had both of the ground alligator clips clipped together on the ground output of the bench top power supply. With the same conditions I attempted to test the circuit with only one ground clip attached (Channel A). In the screenshot below the beginning...

I am currently trying to get my Picoscope 2205A up and running. Using the windows version (6.12.9.2917) at the moment but seem to have the same problems with the Linux version. The circuit I am performing measurements on is a bench top power supply at 7.7 volts DC as input to a LM317 voltage regulat...