1.Touch the black probe to the cathode end of the LED, which is usually the shorter prong. Next, touch the red probe to the anode, which should be the longer prong.diodes let current go just in one direction. 2.The working voltage of the measured LED lamp beads may be high, such as above 3V, and the output voltage of the diode block of the multimeter is not enough.
@@oh-jack , my impression was, you are chinese and I write in english, but I'm from Romania, not from Russia. Anyway this is not important. Salutari din Romania!
@@oh-jack , when I was teenager, I seen many movies with Bruce Lee and for as, Europeans, exist a word ...all chinese are the same. I understood you are not considered yourself chinese, but your writings is same. Cheers 🚹!!
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