Testing My Superconductor

[auto_v]

TL;DR Summary

Testing superconductor

Hi, I would like someone to test the superconductor I have come up with or let me know how ( I don't have a lab ), what I can say that the resistance is almost zero with my Fluke.Regards

 

[berkeman]

We can probably recommend some test labs in your area. What geographical area are you in, and what temperature do you need them to test it at?

 

[jedishrfu]

Multimeters are good for routine electrical and electronic testing, but they struggle when measuring extremely low voltages, currents, and resistances.

A reading of 0 Ω indicates that it is less than the multimeter's resolution value of 0.1 Ω.

 

[Rive]

A reading of 0 Ω indicates that it is less than the multimeter's resolution value of 0.1 Ω.

You need 4W measurement to get close to that. For common multimeters and common measurements a measured zero resistance is rather about an ill-adjusted zero point...

I would like someone to test the superconductor I have come up with or let me know how

You can try the 'quantum levitation' experiment. Not really a measurement, but for 'testing' it's good enough here, I think.

 

[auto_v]

Fluke 115 true rms is definitely not a common multimeter..., but its obvious that every superconductor will always be close to zero resistance, but not zero -I'm referring to a room temperature so we can skip this and proceed to testing.. I'm in Lithuania , so any test labs close by would be nice, temperature is obviously a room one..My superconductor is Type I, so levitation experiment would not suffice..

 

[DaveE]

Fluke 115 true rms is definitely not a common multimeter

It is in California. Marketed mainly to field technicians. It's a good instrument for what it's designed to do, but it won't ever win the DMM Olympics.

Sorry to be the bearer of bad news, but I don't think you can do this sort of work without access to a really good lab. You also need a really good background in lab work, experiment design and such.

 

[Rive]

Fluke 115 true rms is definitely not a common multimeter...

Sorry, but it is.

For those small things, we don't even bother to calibrate most of them at the company. And even our 6.5 digit benchtop suff can fall short, yet we are not even close to those ranges...

I agree with @DaveE here. You need a good lab and a mentor for this.
Check around some local universities. Maybe there will be some students up for an off-course endeavour.

 

[DaveE]

its obvious that every superconductor will always be close to zero resistance, but not zero

Zero. They are zero, that's sort of the definition. That's the "super" part.

 

[berkeman]

Fluke 115 true rms is definitely not a common multimeter...

It is not capable of making 4-wire resistance measurements, which is what you need when measuring near-zero resistance. Are you familiar with 4-wire resistance measurements?

Also, the Wikipedia article describes how resistance measurements are made with superconductors. Have you read through that article yet? What is your background in superconductors so far?

https://en.wikipedia.org/wiki/Superconductivity

I'm referring to a room temperature

Since there are no room temperature superconductors yet, it seems likely that you will want to measure the sample's resistance versus temperature to find the critical temperature...

 

[Delta Prime]

TL;DR Summary: Testing superconductor

Hi, I would like someone to test the superconductor I have come up with

OK, I’ll say it. What is your superconductor material for kicks and giggles?
http://www.superconductors.org/Type1.htm

 

[berkeman]

What is your superconductor material for kicks and giggles?

Please watch the profanity. Oh, wait...

 

[Hornbein]

Zero resistance is not the criterion for superconductivity. It has to expel magnetic fields.

 

[phinds]

Zero resistance is not the criterion for superconductivity. It has to expel magnetic fields.

I thought it was defined as BOTH expelling magnetic fields AND having zero resistance.

 

[Hornbein]

I thought it was defined as BOTH expelling magnetic fields AND having zero resistance.

Hmm, is there anything that expels magnetic fields that isn't superconductive? I dunno but had the idea that there wasn't.

 

[phinds]

Hmm, is there anything that expels magnetic fields that isn't superconductive? I dunno but had the idea that there wasn't.

Doesn't really matter. What matters is that the definition of superconductivity is that it have zero resistance. I think the "expels magnetic fields" is just an addition, but in any case, it's BOTH.

 

[Ivan Nikiforov]

The complete displacement of the magnetic field from the volume of the superconductor (the Meissner effect) can be used to study your product. This experience is as follows. The sample is cooled with liquid nitrogen and, when it enters a state of superconductivity, a permanent magnet is placed over it. If the sample is superconducting, then the magnet will repel it and hang in the air. Of course, such an experiment should be carried out in a laboratory environment in compliance with safety measures.

 

[auto_v]

The superconductor is a mixture of organic compounds and that is all i can say so far as you understand..Anyway I checked a voltage across superconductor and it is the same as resistance close to 0, I think I will need a lab to confirm the rest, if any of you can suggest any lab or person capable to do so in close proximity so I can send the sample and verify that it would be great.

 

[berkeman]

if any of you can suggest any lab

I don't think we have many PF members from Lithuania, but I just did a Google search on test labs with low temperature capability and got lots of hits for labs near me. Maybe try the same search to find labs near you.

 

[auto_v]

would this one do ? https://axistestlaboratories.co.uk/testing-services/low-temperature-testing
or any other in UK if you can get?

 

[Delta Prime]

The superconductor is a mixture of organic compounds and that is all i can say so far as you understand

Apologies…My understanding is a Fluke “0”

 

[berkeman]

would this one do ? https://axistestlaboratories.co.uk/testing-services/low-temperature-testing
or any other in UK if you can get?

UK is a long way from Lithuania, no? That web page says that they only go down to -70C; what temperature range do typical superconductors work?

 

[Tom.G]

From the link in post #10, around -267°C.

 

[auto_v]

UK is fine, if I am sending sample then it does not really matter.

Regards

 

[berkeman]

Then extend your search for labs that have cryogenic test capability.