Here's the deal, look at most any reference pinout for POE 802.3af and you'll find something like this:
Notice how it says positive is on pins 1 and 2 for mode A?
But running this simple setup:
Notice the negative sign on the reading, even though pin 1 is connected to the positive.
Here are the close-ups:
Cables are both straight-thru patch.
Have used other cameras, switches, meters and cables with same result.
Also, when testing mode b, everything works as expected:
easy enough to replicate.
Any ideas if I'm interpreting the diagram wrong or doing the test wrong?