A diode is not a voltage source - it does not generate voltage by itself ..
A voltmeter, on the other hand, only measures voltages generated by voltage sources such as batteries, power supplies etc. etc. ..
Apply current to a diode (voltage source + series resistor) and then measure voltage accross it ..
thats because once you put in the multimeter or the voltmeter terminal across the diodes it will source in a current which is possible only if the potential barrier is broken. hence you may not be able to measure it. this is my opinion.
having a barrier voltage doesn''t mean that u should have a meter reading.
No current is flowing through diode contacts. This is not device level measurements.
Use a multimeter which have a diode symbol. That one will inject around 1 miliamper and measure the voltage as well.
BTW, how could you detect easily differences between a germanium diode and a schottky diode as long both have the same voltage drop across them at a given current of say 10mA ?
BTW, how could you detect easily differences between a germanium diode and a schottky diode as long both have the same voltage drop across them at a given current of say 10mA ?
While checking with multimeter, touch diode with hot iron. If germanium, voltage drop will decrese more rapidly than shottky. Awnser after 4 years is just for reference.