The zener diode characteristics shows under the reverse bias condition, the voltage across the diode remains almost constant although the current through the diode increases in the region p-n. So the voltage across the
Zener Diode: 6.2v To 200V Regulator PDF Details:
zener diode serves as a reference voltage. Hence the diode can be used as a voltage regulator.
ZENER DIODE-With Digital multimeter
How test Zener Diode with Digital Multimeter?
Connect DMM (+) Test Red lead to anode
DMM (-) Test Black lead to cathode
Verification: DMM Reading shows = 0.548v to 0.668v = GOOD condition.
Connect DMM (+) Test lead to cathode
DMM (-) Test lead to anode
DMM Reading shows = OL or OPEN or ‘1’ (over load) = GOOD condition.
Verification: If you get reading in forward bias as 0000 or OL or 1, in reverse bias as 0000 (or) low values the device can be FAULTY and needs replacement.
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Thank You for your comment
You should mention the mode selection to multimeter. And can voltage range display in diode mode?