Wanting to make some negative DC to watch conventional current flow

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I wanted to get my hands on some negative DC and see (ok we know it will  ) if it would pass through a diode from the cathode side

The first "circuit" I came up with in the midst of drawing it I thought oh wait this is gonna be a normal circuit we are just looking at it from another perspective but then I realized yeah no not quite

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I kept trying to figure out how to wire this up to get negative DC and about the best I could do was having to utilize an external ground

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Which seemed to work
For the ground i connected the positive terminal of PACO to the Ground terminal of my scope
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I slowly dialed up and adjusted it to about 5C DC

So I had -5V DC at the anode side of the diode
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And then -4.4V DC at the anode

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So I think I did this right and seems to agree with what I was looking for

Then I remembered well there's nothing wrong with the first circuit it's just that the cathode will be at zero  so I hooked it up and get about 0.67V DC at the anode