Question

What is the expected reading obtained on a Digital Display Meter with diode-checking function when a proper functioning silicon semiconductor diode is connected across its leads in the forward bias configuration?

(a) 0.67 V

(b) 0.3 V

(c) Open Loop Indication

(d) Varies with the diode

The question was asked in a job interview.

The above asked question is from Types of Diode and their Testing in portion Diode Circuit of Analog Circuits

Answer 1

Correct choice is (a) 0.67 V

The best I can explain: The diode checking function on the meter when used causes a current of 2 mA to flow through the diode and hence under forward bias, the voltage is determined to be 0.67 V. Germanium diodes show a drop around 0.3V.