I was reading HKJ’s tutorial on how to take multimeter measurements on a flashlight when I saw how he measures switch resistance, he suggests to first calibrate the ohmmeter to see what is the lowest resistance it can measure by touching both multimeter probes and checking the value of the resistance.
I checked mine and it showed 4.5 ohms, WTF! |( totally unacceptable! I decided to investigate why was the resistance across the probes that high, I was expecting to see something below 1 ohm, not 4.5 ohms! So I decided to clean the terminals and probes with circuit cleaner, then de-oxit and then give it a good coating of Pro-gold to both the terminals and the probes, after the maintenance the resistance dropped from 4.5 ohms to 0.1 ohms! Wow! what a difference!
Moral of the story, if you are going to take flashlight measurements make sure you do regular maintenance to the probes and terminals to get more accurate readings.
