resistor identification - fixed, thanks to all that helped!

[brooktre]

I can't figure what resistor to buy to replace this one. It's from a Fluke T5-1000. It looks like there are 3 black bands and 1 brown band.

 

[Cruzan80]

Edited: don't do math tired, or you imagine more colors. 10 ohm, not 100.

If it is Brown-Black-Black, it is a 100ohm 10ohm resistor. The last band by the crack is the tolerance (looks gold to me)

Three blacks and a Brown doesn't make sense. Either it is using Brown for the tolerance (1%), but Black-black-black is a meaningless color combination (00x10^0), or it is 100ohms 10ohms, but black doesn't denote a tolerance spec.

Most modern resistors are 5 band, not 4 band. Sure you aren't missing a color?
Can you find a schematic?

 

[wyliesdiesels]

wow did you blow up the T5-1000?

 

[BillK]

The second picture looks like Brown-Black-Black-Gold but its hard to tell for certain. I also see what looks like a paint "dot" on the left hand side in the first picture ? Are you sure it is a resistor ? I have seen some strangely marked diodes in some automotive applications.

I would call Fluke and see if maybe they will tell you or at least maybe send you a schematic ?

 

[tvand13]

If it is Brown-Black-Black, it is a 100ohm resistor. The last band by the crack is the tolerance (looks gold to me)

That isn't how the third multiplier band works(Check your math on 10^0). Brown black black is 10ohm. I agree that the last band looks gold. OP, can you confirm this?

Also, it's definitely a resistor. Could you measure the body length and diameter so we can recommend a replacement? How was it damaged, and are there any other burned spots or components on the board?

 

[brooktre]

wow did you blow up the T5-1000?

No - I picked it up for $5. The volts / amps work, but the ohms does not.

 

[PCustoms]

Brown, black, black gold



The crack is at the gold band

 

[jbltwin1]

Looks like metal oxide from here but any 100 ohm will work for diagnosis. I would say about a 1/2 watt to 1 watt from the pic but the size can be misleading on a pic.

 

[bwringer]

I thought Flukes never ever failed, and you're gonna die of electrons in the pancreas if you use anything but a Fluke to check a flashlight battery...

 

[tvand13]

Looks like metal oxide from here but any 100 ohm will work for diagnosis. I would say about a 1/2 watt to 1 watt from the pic but the size can be misleading on a pic.

Why do people keep saying 100ohm? @brooktre, this is a 10ohm resistor.

 

[ratflinger]

Bad Beer Rots Our Young Guts But Vodka Goes Well

 

[bronc076]

Bad Beer Rots Our Young Guts But Vodka Goes Well

They cleaned that one up since I went through Basic electronics back in the 80s.

 

[Cruzan80]

That isn't how the third multiplier band works(Check your math on 10^0). Brown black black is 10ohm. I agree that the last band looks gold. OP, can you confirm this?

Also, it's definitely a resistor. Could you measure the body length and diameter so we can recommend a replacement? How was it damaged, and are there any other burned spots or components on the board?

Yes, my bad. Too used to working with 5-band resistors with my students (doing an Arduino unit right now). Mentally went Brown-Black-Black-Black, which would be 100ohms (1-0-0-10^1).

 

[tvand13]

Yes, my bad. Too used to working with 5-band resistors with my students (doing an Arduino unit right now). Mentally went Brown-Black-Black-Black, which would be 100ohms (1-0-0-10^1).

I don't want to get this thread hung up on it, but even in that example 5 band, the black multiplier band is 10^0 = 1, not 10^1. Agree that brown black black black is 100ohms though.

OP, as soon as you can confirm that last band is gold and the physical dimensions, finding a new resistor is very easy. It's 10ohm, probably 5%, looks to be around 1 watt, but it's hard to tell the true size without a physical measurement.

 

[Cruzan80]

Yes, again. Ignore most of my math!

 

[purplezr2]

Chart for reference

 

[brooktre]

Here are the resistor measurements:

 

[brooktre]

Good eyes PCustoms - I didn't see gold in my own pictures!

 

[brooktre]

and are there any other burned spots or components on the board?

This component show some blackening, but measures 1534 ohms so I don't know if it is good or not.

 

[MBfreak]

Fluke schematic and/or access to an undamaged Fluke of same kind will solve your Q.
I guess 10 Ohms is correct and it does not look like it has been fried.
What I do not understand AT ALL is why the part is broken.
If it is part of a current circuit, FLUKE always use fuses to protect the shunts.
Never seen a blown FLUKE current circuit resistor.
Ola

 

[Worsedog]

That looks to be a MOV. Metal Oxide Varistor. Used for surge and transient protection. If it's smoke damaged from its own construction, not transfer from another component, it likely gave its life and should also be replaced.

 

[senlow]

Bad Beer Rots Our Young Guts But Vodka Goes Well

You missed the tolerancing. The mnemonic that I learned is:
Bad Boys **** Our Young Girls, But Violet Gives Willingly. Get Some Now.

 

[rlwhitetr3b]

While I learned the bad boy version in college, when I was teaching high school electronics we used bad boys race our young girls but Violet generally wins. I do not remember the tolerance part on either of them.

 

[DGersic]

Black-black-black is a meaningless color combination (00x10^0)

Not completely meaningless. I’ve seen 0 Ohm “jumpers” with a resistor body, because those are machine stuffable parts instead of having to hand stuff a jumper wire on a board being manufactured.

I can’t recall offhand if that was three black lines or one, though.

 

[txvwnut]

While I learned the bad boy version in college, when I was teaching high school electronics we used bad boys race our young girls but Violet generally wins. I do not remember the tolerance part on either of them.

That is what I taught in high school tech class, after dad taught me the college version.

 

[Cruzan80]

Not completely meaningless. I’ve seen 0 Ohm “jumpers” with a resistor body, because those are machine stuffable parts instead of having to hand stuff a jumper wire on a board being manufactured.

I can’t recall offhand if that was three black lines or one, though.

Just so I make sure I am understanding correctly, by using a 0-ohm "resistor", the robot was able to grab it easier to solder/wire into place? I would think that it could be handled with better design of the PCB (I haven't designed those personally, so could be way off base).

Or are you referring to some kind of retrofit?

 

[DGersic]

Just so I make sure I am understanding correctly, by using a 0-ohm "resistor", the robot was able to grab it easier to solder/wire into place? I would think that it could be handled with better design of the PCB (I haven't designed those personally, so could be way off base).

Or are you referring to some kind of retrofit?

Correct, a robot stuffed board. The robot is already stuffing resistors, so a 0 Ohm resistor is easy to spec instead of having to have it deal with a wire jumper.

Sometimes you can’t avoid a crossing. Sometimes it’s cheaper to use a single sided board and jumpers instead of a two sided board. Sometimes jumpers are provided for options that may need to be changed after it leaves the factory.

 

[isb cornbinder]

The second picture looks like Brown-Black-Black-Gold but its hard to tell for certain. I also see what looks like a paint "dot" on the left hand side in the first picture ? Are you sure it is a resistor ? I have seen some strangely marked diodes in some automotive applications.

I would call Fluke and see if maybe they will tell you or at least maybe send you a schematic ?

I called Fluke for a model 75 part and they sent it for free.

 

[The Cobbler]

on an electronic repair site I watch on you tube ,according to him, 0 ohm resistors are used as fuses as well

 

[FuelFC]

Violet grunts, per my old instructor. And we all figured he knew first hand. He was a really strange dude.

 

[no704]

Last job I had, had an ongoing rework on some boards. Removed a surface Mount transistor and replace with a 0 ohm surface mounted resistor. Probably did 5000 units by hand under a lighted magnifying glass. Fun times!

 

[brooktre]

I finally got around to fixing the meter. I ordered a 10 ohm 3 watt 5% resistor, replaced the broken one and all functions work on the meter! Thanks to everyone for your help!

 

[The Cobbler]

great on the repair