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100-150 words

[1]        How will you check a diode with multi meter?

Remove or disconnect the diode from the circuit. (if the power is turned off instead of disconnecting the diode, discharge all capacitors and remove all fuses in the circuit). Multi meter drives a small dc current (a few ma) through the diode p-n junction, and acts as a Voltmeter to measure the voltage across it. Connect the two probes across the diode. Read the voltage drop, it should be 0.5v – 0.8v (500 mv to 800 mv) for a healthy silicon diode. Reverse the probe connections and the display should indicate ‘over range’. If the display indicates over Range in both directions, means the diode is open circuited. If the display indicates less than 1 v in both directions, diode may be short circuited.