I have some AUK diodes (http://www.kodenshi-tk.co.jp/products/power_semi_device/pdf/power_diode_02/14-19_SF10A400HDS.pdf) set in a Samsung X-sustain buffer board for a Plasma TV (PCB number LJ41-08420A). I'm testing with a Klein Tools MM400 multimeter set to diode mode.
Testing with positive on anode, negative on cathode, I get between 0.396 and 0.4v drop between terminals.
Testing with negative on anode, positive on cathode, I get steadily increasing voltage. I let it get as high as 2.8v before stopping.
This happens on all 11 diodes I have tested. A few of these diodes also test as shorted to ground.
I expected to see one of the following: a voltage drop (forward) and OL (reverse) for a working diode; OL in both directions (open circuit); 0v to 0.v4 in both directions (shorted).
Are these diodes faulty? If so, how would I explain the multimeter reverse reading? Is this just a quirk of my multimeter?