I just got some 0 Ohm resistors with 5% tolerance. Seriously anyone know how to do this math?

 

I've always heard 0 resistors do not use tolerance ratings so maybe its just the way the manufacture labeled them because of their system.

 

I just got some 0 Ohm resistors with 5% tolerance. Seriously anyone know how to do this math?

Simple.
5% of 0 is zero,
100% of 0 is still zero.

Hence you cannot state any % tolerance on 0.

However, the manufacturer can state an absolute tolerance, for example, 0 + 10mΩ

 

Never heard of a 0 ohm resistor. You learn something every day

 

https://en.wikipedia.org/wiki/Zero-ohm_link

 

@Rich2 Its used as a jumper in many cases. I've seen it used in some really packed boards to cross traces.

 

https://www.vishay.com/docs/31017/rcwp99.pdf

 

I rest my case

 

I just got some 0 Ohm resistors with 5% tolerance. Seriously anyone know how to do this math?

Buy a reel, change the label and claim 0.1% tolerance and resell them with a big markup.

 

How about a 0 ohm, Kelvin connect, current sensing resistor? In the old days there was the write only memory made by Signetics.

https://www.allaboutcircuits.com/textbook/direct-current/chpt-8/kelvin-resistance-measurement/

http://repeater-builder.com/molotora/gontor/25120-bw.pdf

 

I rest my case
View attachment 181345

and it has a 1/8 W power rating! Hugh?

 

I'm sure its just their label machine setup

 

and it has a 1/8 W power rating! Hugh?

Great point!

 

I have used them in a circuit where I thought I might want to put a non-zero value someday. Such as in series with another resistor to tune something. Mostly in the old days when precision was more expensive than now.

 

I rest my case
View attachment 181345

Manufacturers don't make resistors, measure them, and then put a label on it.
The manufacturing process is very precise.
They make xxxΩ resistors to ±y% to very precise specifications.

Hence they make 0Ω ±5% 1/8W resistors using the same process that they make 1Ω ±5% 1/8W resistors.
So that is what you are getting.

 

It just reads like they’re stupid and I’m having fun pointing that out

 

When you have to stock, inventory, and catalog your components, where do you put the 0Ω resistors?

They go at the starting lineup of 0805 ±5% 1/8W series. Simple, duh!

 

I'm thinking a 0 ohm resistor has to be superconducting...

 

Are they laser trimmed?

 

Well, since there really is no such thing as a zero ohm resistor, the tolerance spec needs to be a ± value, not percentage, like @MrChips states above.

I have used them as jumpers on a complex single sided board, when the backside had to be clear of traces.