Author Topic: Is this the so called zero ohm resistor?  (Read 1713 times)

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Offline sdancer75Topic starter

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Is this the so called zero ohm resistor?
« on: September 25, 2019, 05:01:18 pm »
Is this a zero ohm resistor? My dmm shows 19kohm
 

Offline oPossum

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Re: Is this the so called zero ohm resistor?
« Reply #1 on: September 25, 2019, 05:02:18 pm »
That is a thermistor.
 
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Offline sdancer75Topic starter

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Re: Is this the so called zero ohm resistor?
« Reply #2 on: September 25, 2019, 05:09:25 pm »
Are you sure ? Check this link at wiki they seem identical

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

Offline mikerj

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Re: Is this the so called zero ohm resistor?
« Reply #3 on: September 25, 2019, 05:18:17 pm »
Are you sure ? Check this link at wiki they seem identical

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

The component on your board has a glass package, the zero ohm link in the wikipedia picture is a ceramic part.  I agree with oPossum, it looks very much like an axial thermistor.
 
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Offline ogden

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Re: Is this the so called zero ohm resistor?
« Reply #4 on: September 25, 2019, 05:18:40 pm »
 
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Offline Kilrah

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Re: Is this the so called zero ohm resistor?
« Reply #5 on: September 25, 2019, 05:18:54 pm »
The band on the zero ohm resistor is a marking. There is no printed band on your component, you just see the 2 halves of the innards through the glass.

And your DMM measures 19K, which is not 0.
 
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Offline sdancer75Topic starter

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Offline sdancer75Topic starter

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Re: Is this the so called zero ohm resistor?
« Reply #7 on: September 25, 2019, 05:35:07 pm »
The band on the zero ohm resistor is a marking. There is no printed band on your component, you just see the 2 halves of the innards through the glass.

And your DMM measures 19K, which is not 0.

Thought of bad resistor.....
 

Offline Kilrah

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Re: Is this the so called zero ohm resistor?
« Reply #8 on: September 25, 2019, 06:17:08 pm »
It would be burnt to hell if it had broken.
Also I've never seen a resistor in such a glass package.
 
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Offline Howardlong

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Re: Is this the so called zero ohm resistor?
« Reply #9 on: September 25, 2019, 06:21:49 pm »
Then there is the ultimate nerd and pedant paradox, it can’t be a resistor if it’s zero ohms.
 

Offline helius

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Re: Is this the so called zero ohm resistor?
« Reply #10 on: September 25, 2019, 07:18:04 pm »
Then there is the ultimate nerd and pedant paradox, it can’t be a resistor if it’s zero ohms.
Even a (normal) conductor can't be zero ohms! Only superconductors can.
But in practice we only care about resistances that visibly affect the circuit. In low-power or signal circuits, several milliohms is as close to zero that the difference isn't significant. In high-power delivery systems, those milliohms matter a lot more.
 
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Offline Kilrah

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Re: Is this the so called zero ohm resistor?
« Reply #11 on: September 25, 2019, 07:26:23 pm »
Then there is the ultimate nerd and pedant paradox, it can’t be a resistor if it’s zero ohms.
We should probably call it the "insignificant resistor" then... or "packaged wire"  :-//
 

Offline Bud

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Re: Is this the so called zero ohm resistor?
« Reply #12 on: September 25, 2019, 08:01:26 pm »
Put your finger on it while measuring, problem solved.
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Online Gyro

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Re: Is this the so called zero ohm resistor?
« Reply #13 on: September 25, 2019, 08:22:28 pm »
Then there is the ultimate nerd and pedant paradox, it can’t be a resistor if it’s zero ohms.

I have to admit that I find the fairly common practice of suppliers listing them as +/- 5% tolerance is rather amusing. Definitely worth getting a batch and weeding out those -5% ones.
Best Regards, Chris
 
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Offline ogden

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Re: Is this the so called zero ohm resistor?
« Reply #14 on: September 25, 2019, 09:16:33 pm »
Then there is the ultimate nerd and pedant paradox, it can’t be a resistor if it’s zero ohms.
I have to admit that I find the fairly common practice of suppliers listing them as +/- 5% tolerance is rather amusing. Definitely worth getting a batch and weeding out those -5% ones.
0R with proper datasheet have non-zero resistance specified. In result +/-5% spread do not look weird anymore and you can put away your free energy generator plans.
 

Offline RoGeorge

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Re: Is this the so called zero ohm resistor?
« Reply #15 on: September 25, 2019, 09:29:21 pm »
I don't see a zero ohm resistor, that's a thermistor.

19 Kohm at room temperature is a common value.  Heat it with the finger or with something else while measuring its value and you should see how the resistance changes.
 
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Offline soldar

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Re: Is this the so called zero ohm resistor?
« Reply #16 on: September 26, 2019, 01:40:04 pm »
I have to admit that I find the fairly common practice of suppliers listing them as +/- 5% tolerance is rather amusing. Definitely worth getting a batch and weeding out those -5% ones.

Think again. No matter how small the value, even zero, you will never get a negative value by subtracting 5%. Or 50%.
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