Crowbar Diode... resistance?
Jul 15, 2005 at 9:41 AM Post #4 of 6

peranders

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Do you mean D1?

You can't really talk about resistans in a diode and if you put your DMM on Ohms and measure, this reading will only be true for true resistances.

If you switch over to "diode"/"buzzer" you will read "something" (unimportant) when you have DMM plus wire on plus and minus on minus. If you switch to your DMM cables and have "red" wire on minus you will read less than 0.7 volts, probably around 0.3-0.4 V.
 
Jul 15, 2005 at 10:21 AM Post #5 of 6

setmenu

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Here is an example of a diodes behavior as the forward voltage is increased.
Unlike a resistor they are not linear devices and their conductivity increases
with voltage.[they are classified as semiconductors]
So if you connect one to an ohmmeter the reading you obtained will depend upon
the voltage the meter applies to the diode.
Generally diodes will require anything form .1-.6v to begin conduction.





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