Author Topic: Solve the Mystery blue diode  (Read 594 times)

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Offline WiredSmartTopic starter

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Solve the Mystery blue diode
« on: March 03, 2023, 06:42:44 am »
I am a novice to electronics and i was experimenting with x2 multimeters and a few diodes. The meters I used was a Fluke 117 and a Kaiweets HT206 Clamp meter (both meters i love, so I have no prejudice between either)



A good  friend of mine was showing me how to test diodes using a multimeter when we discovered something odd on a blue led. When testing with the Fluke 117 on diode mode, the diode light0 emits, but it displays O.L ? When testing with the Kaiweets clamp meter the opposite happens on diode setting, the led emits but it displays a forward voltage reading and not a O.L reading.

I've ran the test with other leds of different colours but somehow the blue colour  led does not show a reading on diode mode with the Fluke 11760.

Could someone please help me understand why this is . Im looking forward to somone solving this mystery. 0
« Last Edit: March 03, 2023, 06:54:08 am by WiredSmart »
 

Offline Swainster

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Re: Solve the Mystery blue diode
« Reply #1 on: March 03, 2023, 06:50:29 am »
In the Fluke 117 user manual, it states that diode check will display OL when the measured voltage goes above 2V. This is a choice that fluke made - perhaps to reduce confusion when measuring stuff in-circuit i.e. when other components may be in parallel with the diode under test. It's just something you need to be aware of when using different multimeters (not all work exactly the same way)
 
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Offline WiredSmartTopic starter

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Re: Solve the Mystery blue diode
« Reply #2 on: March 03, 2023, 06:57:52 am »
Thanks champ...LEGEND
 


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