Why do we use 4 wire resistance measurements?
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- Опубліковано 21 лип 2024
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Why do we use 4-wire resistance measurements
In this video we take a look at how digital multimeters measure resistance, what some of the limitations are and how they can be (mostly) overcome by a 4-wire measurement. - Наука та технологія
It should also be noted that when testing a free standing resistor that you do NOT touch both probe tips to your fingers while doing the measurement. If you do, you will be measuring the parallel combination of the resistor and your own body resistance, which will tend to make the meter indication lower than it should be! When measuring a 10 kΩ resistor, this error will be minimal, but it may be more severe when measuring other values of resistors.
Usually a super precise resistor reading is not necessary (as in pullups or pulldowns) but other times it does (as in low value current shunts). Nice vid and multimeter.
+Michael Padovani Thanks. It really is a good meter. A 5 1/2 or 6 1/2 digit meter is a necessity if you are designing circuits or doing experiments.
On the other hand, if you doing Arduino or Raspberry Pi stuff you can just use a hand held meter.
Best explanation. Thank you so much!!
very educative. Thank you regards
Thank you so much for helping me understand!
Very good explanation
Wonderful video project. Thumbs up. :)
Thanks for your video..did you load source current setting in 8884 before testing the 180Ohms resistor
is it used for measuring the resistance of conductive material that resistance in micro ohm ? and what is the range of ampere and voltage for this device
Hope you have a good day back at work! OK so let me get this straight. I use one meter on the outside of the resistor on resistance and another meter on the insides of the other set to DC voltage? Then using Ohm's law calculate the real resistance? Seems's like a lot of work to me, I just use the average reading from all my meters like you've told about before. But for a real precise measurement it's good to know a way to get it. Thanks for further instruction on the 4 wire method, though I will go back and rewatch the previous one useing 2 meters.Thanks Paul,more great instruction!
+George Chambers You're welcome buddy. If you don't need low value resistance readings (say 10R or less) you are just fine with a regular 2 wire reading. PS check your mail in a couple of days...
Thank you, my friend. I will remember the 4 wire method though.
Can you give a bunch of examples of what types of circuits you would use the 4 wire resistance measurement? I'm guessing its mostly used for sensors or very low resistances but for what types of circuits or applications?
great video
Thanks!
That's cool I never heard a boot this till mow
Interesting and useful. Is it possible to perform a 4 wire measurement without a 4 wire capable meter? e.g. two multimeters.
+Phil Owen Yes it is. I did a video on how to do it a while back.
The hand-held meter - after shorting test leads & using 'relative' - hovered around 177.8 ohms. The bench meter with 4-wire method gave readings around 177.7 ohms. We understand this presentation is an "info-example" of the 4-wire method. I came away a bit surprised at the bench meter used without any "relative button" zeroing of the test leads. Wouldn't that be all the more important with 4 test leads? It would surprise me a lot if said bench meter did not have any 'relative' button.
+Are Jayem It does and was done off camera. Sorry, I should have included it.
it would seem to me that a bench power supply and a good multi-meter could accomplish the same as the 4-wire bench multi-meter.
+Douglas Kryder It's possible, just not as convenient.
And as always "Probe Length" does matter... DOH... :P
Batman watchin over you on the multimeter ye?
Brilliant!
He has the exact mannerisms of the joker
Too precise for anything I'd be tackling but nice to know!
+gartmorn Thank you Davy! Yeah, 4-wire is not necessary for everyday day use unless you are making current shunts or designing RF circuits that must be precisely tuned. 2-wire on a nice hand held meter is plenty.