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MEXICOWANDERER's avatar
MEXICOWANDERER
Explorer
Nov 19, 2017

It's So Easy To Make Primitive LED Diagnostics

For announcing the presence or not of shore power. Wired across a 120vac circuit breaker to announce a tripped breaker... AMAZON FOR TEN LEDs Yuco PACK OF 10 YuCo YC-9WRT-1R-120-10 RED 9M...
liborko's avatar
liborko
Explorer
Nov 20, 2017
The pictured item could be LED type but it could also be the old style neon indicator.
I was recently testing some leds and got a surprise. The meter I use most of the time indicated bad led while I knew it was good. My Fluke 85 had no trouble determining the led was good. It turns out the meter that had trouble only puts out 2.5V in semiconductor test position while Fluke puts out 3.77V in the same position. 2.5V was not enough to turn white led on.

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