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Schotke diode

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gspecketer(at)gmail.com
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Posted: Fri Apr 24, 2015 4:17 am Post subject: Schotke diode

I was going to install my diode and decided to check it with my ohm meter.  To my surprise I get no continuity in any direction any combination of pins.  What is up?



Gary

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techno-wizard

Joined: 18 Nov 2010
Posts: 1

Posted: Fri Apr 24, 2015 4:33 am Post subject: Schotke diode

It could be that the batteries in you ohmmeter are too low to provide a high enough voltage to forward-bias the diode. Put fresh batteries in and test it again.



Keith



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rnjcurtis(at)charter.net
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Posted: Fri Apr 24, 2015 4:53 am Post subject: Schotke diode

Sent from: YOGA TABLET 10 HD+



Gary Specketer <gspecketer(at)gmail.com> wrote:




I was going to install my diode and decided to check it with my ohm meter.  To my surprise I get no continuity in any direction any combination of pins.  What is up?



Gary



Probably your meter!  Many digital meters operate on such a small voltage, when measuring resistance that they don't even have enough to break down the forward junction of the diode, thus indicating a high resistance in both directions.  An analog meter is my preference for this task



you could use a 1K resistor in series with a battery and put this across the diode.  The voltage measured across the resistor will be high when the diode is forward and low when reverse voltage is applied.



Roger

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ceengland7(at)gmail.com
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Posted: Fri Apr 24, 2015 7:33 am Post subject: Schotke diode

On 4/24/2015 7:49 AM, rnjcurtis wrote:

 	  Quote: 	
		   



 Sent from: YOGA TABLET 10 HD+



 Gary Specketer <gspecketer(at)gmail.com> wrote:



 

 I was going to install my diode and decided to check it with my ohm meter.  To my surprise I get no continuity in any direction any combination of pins.  What is up?



 Gary



 Probably your meter!  Many digital meters operate on such a small voltage, when measuring resistance that they don't even have enough to break down the forward junction of the diode, thus indicating a high resistance in both directions.  An analog meter is my preference for this task



 you could use a 1K resistor in series with a battery and put this across the diode.  The voltage measured across the resistor will be high when the diode is forward and low when reverse voltage is applied.



 Roger



Or just put the digital meter in diode test mode (look for the diode 
	


symbol on the selector switch).

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speckter(at)comcast.net
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Posted: Fri Apr 24, 2015 8:16 am Post subject: Schotke diode

Ah I wondered about that as it is a cheap harbor freight one and I think it has a coin battery



[quote] On Apr 24, 2015, at 8:31 AM, Keith C. Borgstrom <Keith.C.Borgstrom(at)dartmouth.edu> wrote:

 

 

 

 It could be that the batteries in you ohmmeter are too low to provide a high enough voltage to forward-bias the diode. Put fresh batteries in and test it again.

 

 Keith

 

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