help identifying resistor - Page 1
Forum section: electronics / beginners

author: sslingerland
author_rank: Newbie
timestamp: November 29, 2023, 03:34:02 pm
content: Hi all.Can anyone help identify this 5-band resistor (attached photos) and where i can get replacement?Is a little hard to tell from color codes because it's a little burnt.Thanks, ScottP.s. this is resistor R41 from craftsman multimeter model 82018. circuit board model 97TS10 V1.0

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: November 30, 2023, 12:45:16 pm
content: The fifth band is black. that is usually the code for a non inductive wire wound resistor.Can you measure the resistor or is it open?Also the dumbbell shape is common in wire wound resistors

author: Terry Bites
author_rank: Super Contributor
timestamp: November 30, 2023, 01:31:30 pm
content: https://uk.farnell.com/resistor-colour-code-calculator

author: Jwillis
author_rank: Super Contributor
timestamp: November 30, 2023, 11:41:48 pm
content: Black is weird colour for tolerance. Maybe I missing something.

author: sslingerland
author_rank: Newbie
timestamp: December 01, 2023, 02:06:46 am
content: Thanks for the tip that the black band indicates wire wound resistor.Based on this, would I call this a 4 band resistor:Yellow-White-Gray-SilverThus it would be a 4.98 ohm 10% resistor?If this is accurate, where could I buy them?

author: wraper
author_rank: Unknown
timestamp: December 01, 2023, 02:20:17 am
content: Quote from: sslingerland on December 01, 2023, 02:06:46 amNobody makes 4.98ohm with 10% tolerance, not even just a nominal value this precise for low resistances. And why do you use the same band for both multiplier and tolerance? IMHO you should use better lighting as colors seem to be way off from their real appearance.

author: wraper
author_rank: Unknown
timestamp: December 01, 2023, 02:24:32 am
content: Also I have some doubts it's a resistor. I could be an inductor. It looks like something in between. Not quite like a typical resistor but inductors usually have a bit thicker coating.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 01, 2023, 02:40:38 pm
content: wraper may be right, this could be an inductorDid you measure it with an ohm meter? Is it open or short?Yellow, white, grey would be 4 ... 9.... 8 .... then silver which could be .01 multiplier, Then the black which can be wire wound? White is Fusible and Black is Wire Wound. 5th band can be temp stability also but I don't think black is one of the colors used in temp stability.Colors could be discolored. The "grey" may actually be white since it is at the point of heating....so maybe4.99???I have a bunch of these, much bigger however and 1% Dale. Printed ohms, not color coded.4.99 R is a common resistor. Lots on ebay. I do not think there is a tolerance band on your resistor, but that the black band indicates a wire wound which is used here probably because it can handle more power and they can be wound carefully to achieve pretty high tolerance.They can look quite burned and still be OK.Measure it carefully first.Was it used in the Current Measure part of the Multimeter as a current sense resistor?Does anything on the multimeter work?

author: magic
author_rank: Super Contributor
timestamp: December 01, 2023, 07:06:12 pm
content: Quote from: Wallace Gasiewicz on December 01, 2023, 02:40:38 pmAsking the right question.Less than 10Ω resistor in a DMM is likely current sense, and a value like 4.99 could possibly make sense.Even if it isn't current sense, knowing what it is can help. Can you see what it is connected with? DMM boards usually are relatively simple.Maybe post a pic of this PCB and the place it came from.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 01, 2023, 08:05:10 pm
content: "Less than 10Ω resistor in a DMM is likely current sense, and a value like 4.99 could possibly make sense."And also the fact that it is burned in a multimeter. Happens all the time.

author: sslingerland
author_rank: Newbie
timestamp: December 04, 2023, 03:22:42 pm
content: Hi all-update, the resistor measures 4.7 ohms.I pulled it because the multimeter was measuring resistors oddly, i.e. switching polarity gave different readings on regular resistors, i.e. -2.7 ohms, and +1.2 ohms.The resistor looked burnt, and so just trying to verify that it's good or bad and what it should be.Back to identifying it, thanks for advice that the black band might indicate wire wound or something besides a resistance code.Best, Scott

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 04, 2023, 11:37:08 pm
content: We do not know for sure, but it is likely that the 4.99 resistor is a shunt resistor for the amp scale in your meter.It would only come into play when you are using the Amp readings.The resistor should probably work just fine just as it is for a regular analog meter.Your problem is somewhere else. I think.Look for bad contacts and clean all switches with a brush and isopropyl alcohol.Look for bad solder joints or corrosion.