Help needed in understanding the lab observation regarding a diode

Question

I was trying to understand the connections in a power supply board.

It was found that anode of below diode is connected to GND and -ve terminal of bulk capacitor. Cathode of diode is connected to +ve terminal of bulk capacitor.

^{simulate this circuit – Schematic created using CircuitLab}

One strange measurement result was found when I measured the resistance wrt GND for the 2 cases shown above. The diode orientation is not reflecting correctly while measuring the resistance wrt GND.

Has it got anything with the way the multimeter measures resistance ( by injecting a voltage thereby charging the bulk caps?)

I could find some voltage of 0.2V across diode after the above resistance measurement.

Answer 1

Many analog multimeters actually present a positive voltage out of the black/negative lead and vise versa.

Most digital multimeters operate the obvious way with a positive voltage from the red lead.

That would explain the results you get.

Do you have the manual of the meter? What meter is it?