Hello all,
I'm brand new here and I have a question about determining resistence of a resistor, but first I would like to comment on what a great resource this forum is for the new comer.
I tried doing a search for the answer to my question before I posted this, but I was unable to find an answer within what I considered a reasonable amount of time, so now my question.
Is it possible to determine the resistence of a resistor by using a multi-meter instead of relying on the color coding?
Please keep in mind when answering my question, that I am just one step above being able to replace the batteries in a flashlight. I'm trying hard to learn this stuff.
Yes, put your DMM on "Ohms" measurement mode and connect the two leads, one to each resistor lead. If you get "OL" on your meter, try a higher resistance setting (10K, 100K, etc).
I use my DMM all the time to measure my resistors. Those dang colors often don't have the shade they are supposed to have.
I would say, yes as long as the resistor is out of a circuit. If it is in a circuit the meter may not read the correct resistance depending upon the circuit.
Thanks for the replies. Perhaps I should have explained in my first post why I wanted to know the answer to this question. I have color defective vision (commonly referred to as color blindness) and while I can ask my wife to tell me the colors of those little bands, it would be far easier for me to able to test them with the MM.
So again, thanks to those who have answered my question.
Y
As others have said, yes, use the ohms range.
That is one of the basic reasons for a multimeter.
Again, be aware that if a resistor is in a circuit there may be other components connected to it which affect the value as measured by the meter. The resistor itself does not change, it is just that there may be other components effectively in parallel.
Also consider faultfinding, it is possible for resistors to fail by going high in value or completely open circuit, the multimeter is used to test the resistor values. Again you must be aware of other components in the circuit affecting the readings.
I'm also color blind, red-green, and quite severely. I MUST use a multi-meter to determine resistance. I also keep all my resistors neatly organized in little drawers, so I know which ones I've already tested and can pick them out easily.
It really sucks when you're breadboarding something and have a pile of resistors left. Going through each one in turn, testing and sorting them all out again.
I did say "I was a rank beginner"...hahaha. The difficult part of learning electronics for a me, so far, is understanding the nomenclature. It is somewhat akin to learning to speak Chinese, but I am determined that I'm going to at least learn the simple stuff.
I don't understand why these days they don't just print the intended value on the part, it may have been hard to do when they first started making resistors but now it would be easy enough. Sure it would have to be tiney, but I have to get out a magnifying glass to read those anyway. And that way you wouldent have to learn what color each number is and try to make out if its red or orange, violet or pink, silver and grey can be tough also.
I don't understand why these days they don't just print the intended value on the part, it may have been hard to do when they first started making resistors but now it would be easy enough. Sure it would have to be tiney, but I have to get out a magnifying glass to read those anyway. And that way you wouldent have to learn what color each number is and try to make out if its red or orange, violet or pink, silver and grey can be tough also.
yeah, that is true. I just don't know why it isn't common on the through hole ones. Maybe they figure smd people are sophisticated enough to have lighted magnifying glasses while through hole and breadboarders are not?
Probably because the same machines that made resistors 40 years ago are still making resistors now, and at a nickel a pop or less there's no money to fund a change.
I'm colour blind but I'm lucky because it's very mild i don't have a problem reading resistor colour codes.
Sometimes if the lighting is poor I have problems but then I just use my trusty DVM.
If a resistor is in a circuit and you're really stuck then just unsolder one leg and test it with a DVM. Obviously turn the power off first and if there are any high voltage capacitors in the circuit discharge them first.