I'm trying to find how i can test a schottky diode to check it's state but can only find info on 2 pin diodes. The particular diode is this: http://pdf.dzsc.com/2017/20161120/20161120081219688637.pdf
Am i correct in putting positive lead from multimeter to anode (pin 1) and negative lead to cathode (middle pin)….if i get a beep, it's working fine. i get no beeps, so is this diode dead?
the diode is part of a speed controller which isn't turning on.
if it's dead, is there any way I can bypass it to make sure the rest of the controller is actually working?
thanks,
sal
Best Answer
If your DMM has a diode test function (diode symbol on the switch or display), try it both ways.
With the red on the anode it should show the forward voltage at a relatively low current, so maybe 250 (mV) vs. 600 or so with a regular diode. In the opposite direction it should show overrange.
Repeat the test for the other diode in the package.
Of course it needs to be removed from the circuit for this to work reliably.
A beep is not a good indication of semiconductor functionality- typically that means a short circuit, or at least a resistance that is fairly low.