Author Topic: A Precision Zero Ohm Resistor  (Read 8107 times)

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Offline amspire

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A Precision Zero Ohm Resistor
« on: November 20, 2011, 05:09:15 am »
I guess there must be a real use for precision zero ohm resistors, but it just sounds stupid. Would you want to put it on your resume? A Zero Ohm Resistor Designer.

http://www.ohm-labs.com/pdfs/resistance/100-0.pdf

I have been looking for years to find a reference to check all those 0 ohm SMD chips against. Here it is!

Funny. There is no percentage tolerance figure. 1% at least, surely!

Richard
 

Offline JonnyBoats

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Re: A Precision Zero Ohm Resistor
« Reply #1 on: November 20, 2011, 05:30:24 am »
Lets get a big box of 1% tolerance zero ohm resistors and see if they have a bell curve distribution centered at zero ohms or if the mean value is lower than the nominal valve as was the case for the resistors Dave tested.

I could really use some of those zero ohm passive resistors with a value less than the nominal value  ;)
 

Offline robrenz

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Re: A Precision Zero Ohm Resistor
« Reply #2 on: November 20, 2011, 05:50:50 am »
Zero ohm smd resistors can be as high as 20 mOhm so they are far from zero.

The percent error is easy 50 nanoOhm / 0 = infinity  infinitely innacurate.
So lets use 50 nanoOhm error on 1 nanoOhm (close to zero) = 5000% error
50 nanoOhm error on 1 picoOhm (closer yet to zero) = 5000000% error  ???

Offline amspire

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Re: A Precision Zero Ohm Resistor
« Reply #3 on: November 20, 2011, 06:00:05 am »
And you spend all that money thinking you are buying an everyday run-of-the-mill 50 nanoOhm resistors and it is a fake!

It just fools a 4 wire ohms meter into thinking it is less that 50 nanoOhms. It actually will be somewhere in the microOhms at least.

 

Offline Zad

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Re: A Precision Zero Ohm Resistor
« Reply #4 on: November 20, 2011, 11:41:20 pm »
Recently I spent several days designing a zero-ohm active resistor, if that helps at all.

Offline phil_jp1

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Re: A Precision Zero Ohm Resistor
« Reply #5 on: November 21, 2011, 01:08:01 am »
Recently I spent several days designing a zero-ohm active resistor, if that helps at all.

Zero-ohm resistor it's great, but what about infinity resistance standard?
How do you test your 8.5 digit meter for parasitic resistance between probe connectors?

I feel, like I need to get down to work on that right away!
http://JumperOne.com - Electronic projects, tutorials, hacks, etc.
 

Offline amspire

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Re: A Precision Zero Ohm Resistor
« Reply #6 on: November 21, 2011, 01:20:21 am »
Recently I spent several days designing a zero-ohm active resistor, if that helps at all.

Zero-ohm resistor it's great, but what about infinity resistance standard?
How do you test your 8.5 digit meter for parasitic resistance between probe connectors?

I feel, like I need to get down to work on that right away!

I can see you dominating the market - I have never seen anyone else make precision infinity ohm resistors.

There are all sorts of spinnoff's. Like the multiturn infinity ohms potentiometer. And dials that have every division marked as infinity.

What sort of temperature coefficient do you think you can do?
 

Offline ivan747

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Re: A Precision Zero Ohm Resistor
« Reply #7 on: November 21, 2011, 01:23:41 am »
V = IR
10 = I*0
10 = 0
 :o

The resistor needs to have 0% accuracy, though.

I wonder what are the effects of negative resistance.  ::)
 

Offline amspire

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Re: A Precision Zero Ohm Resistor
« Reply #8 on: November 21, 2011, 01:47:21 am »
I like the idea of a 10 decade resistor box with steps of infinity ohms. Regular calibration required at a price ..  well .. how about make it infinite as well for neatness.

I have actually seen it. I remember this guy who made these open ended copper coils to correct for "bad energy" that you mounted on something like a fence post.

To "tune" the coils, he used a dowsing pendulum and a box he made full of rotary 10 position switches.  I had a look inside, and each switch had a single wire going to it. He actually sincerely believed in what he was doing, and he was incredibly proud of his box.
 

Offline phil_jp1

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Re: A Precision Zero Ohm Resistor
« Reply #9 on: November 21, 2011, 02:03:35 am »
I like the idea of a 10 decade resistor box with steps of infinity ohms. Regular calibration required at a price ..  well .. how about make it infinite as well for neatness.

I have actually seen it. I remember this guy who made these open ended copper coils to correct for "bad energy" that you mounted on something like a fence post.

To "tune" the coils, he used a dowsing pendulum and a box he made full of rotary 10 position switches.  I had a look inside, and each switch had a single wire going to it. He actually sincerely believed in what he was doing, and he was incredibly proud of his box.

But that's actually a real schematic to correct for "bad energy" and to tune that coils!
It's just like an Ambient Field Conditioner http://www.lessloss.com/blackbody-p-200.html
or Fostac Maximus http://www.fostac-international.com/en/wissenswertes/maximus.html
which:
- Optimises the natural energy flow in buildings
- Harmonises electro-smog
- Repolarises water veins and other geopathic interference fields
- Increases the efficiency of electricity and raises its effectiveness

or maybe protection from "dirty electricity": http://youtu.be/MLOx1kWCWoc

--
But if to be serious, there's so many people who sincerely believe in such absurd stuff...
http://JumperOne.com - Electronic projects, tutorials, hacks, etc.
 

Offline joelby

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Re: A Precision Zero Ohm Resistor
« Reply #10 on: November 21, 2011, 02:17:38 am »
I wonder what are the effects of negative resistance.  ::)

You can't buy a negative resistor, but some diodes exhibit negative resistance. Have a read of http://en.wikipedia.org/wiki/Negative_resistance .
 

Offline 8086

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Re: A Precision Zero Ohm Resistor
« Reply #11 on: November 21, 2011, 03:16:54 am »
V = IR
10 = I*0
10 = 0
 :o


Come on now  ;D

You can't do that!
 

Offline McMonster

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Re: A Precision Zero Ohm Resistor
« Reply #12 on: November 21, 2011, 04:09:36 am »
V = IR
10 = I*0
10 = 0
 :o


Come on now  ;D

You can't do that!

It reminds me of the old CS joke where 6 times 9 equals 42.
 


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