I have 3 diodes that I would like to test
- 1x USD935
- 2x USD2009
USD935 is identified by its datasheets as a "Power Schottky Rectifier Diode". I cannot find the datasheet of the USD2009 but they have similar test readings. So I'm assuming they are also a "Power Schottky Rectifier Diodes"
I am a bit confused by the name, as I thought a Schottky diode and Rectifier Diode were 2 different things. (different symbols). Some make a distinction between the 2 , others say that a Schottky diode can be used as a rectifier.
To add to the confusion, I have them out of circuit and read that they can be tested using a multimeter in Ohms mode, as well as using the Diode function of the multimeter.
I tested them and got the following results
- black lead kathode / red lead anode : 0.18v (beep)
- Black lead anide / red lead kathode : OLD
- black lead kathode / red lead anode : 170k ohm
- Black lead anide / red lead kathode : 1k ohm
In terms of interpreting the results I found the following :
- In How to Test a Diode Rectifier a forward voltage of 0.5 to 0.8 volts is mentioned when using the diode function of the multimeter. (mine is only 0.18v).
- They also say that with the resistance test (black lead on the anode and the red lead on the kathode) there should be an OL where instead I have 1k ohm.
- In How to Test a Schottky Diode it is mentioned that Shottky diodes can be tested using the continuity test on the diode. Is that the case ? With mine there is no continuity between the anode and kathode.
Are my diodes bad, or am I misinterpreting the test-results / executing the test in the wrong way?