Please can someone explain* this phenomenon…
My new Fluke 17B has a diode test function and indicates about 0.5v on a 1N400x diode one way and open the other… so far so good.
But when I try to read any of a number of (known-good) LEDs it reads open both ways.
The Fluke 18B meter has a dedicated LED test function, so presumably (apart from giving off light) there is something specific to an LED that prevents a normal diode test function?
I’d appreciate some understanding of this.
*Words of one (or less) syllables would be good, thanks