Calibration Frequency of Reference Magnets for Gauss Meter Calibration

E

EMacP

#1
Anybody knows what is the recommended calibration interval for Reference Magnets? Currently I in the process of getting some reference Magnets. The company is issuing a 1 yr cal interval.

Another thing, anybody can recommend me a manufacturer who can produce reference magnet of 100kG transverse. It is good if can give me website or email link.
 
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Stijloor

Staff member
Super Moderator
#2
Anybody knows what is the recommended calibration interval for Reference Magnets? Currently I in the process of getting some reference Magnets. The company is issuing a 1 yr cal interval.

Another thing, anybody can recommend me a manufacturer who can produce reference magnet of 100kG transverse. It is good if can give me website or email link.
Any magnet/calibration experts that can help?

Thank you!!

Stijloor.
 

Jerry Eldred

Forum Moderator
Super Moderator
#3
Sorry that I'm so overwhelmed at work, I am just checking messages.

If it were me (and I'm not a magnet expert - at all), I would go with the manufacturer's recommendations of a year (if that is who calibrated it). The definition (highly simplified and my version of it) is basically the probability to some defined statistical level (quite often, 95%) is the amount of time an item can be expected to remain within its specified tolerance. In my 35+ years of calibrating a little of everything, most items remain within tolerance longer than their interval (there's the 95%).

All that said, first, I would go with the manufacturer's recommended interval (because in establishing an interval, there should be a legitimate basis for it). BUT... once you have it recertified a few times, if you get your certifications with the measurements and perhaps uncertainty, you can plot over a few years how well it holds its specifications and how far it actually drifts over its interval, and eventually come up with a calculated interval, which may be longer than a year.

I do not recommend arbitrarily establishing a longer interval just to save money, because in doing so, although you may save some vendor calibration costs, until you establish a statistical trail of evidence, you are increasing the risk/probability of making bad measurements based on the calibration of the item.

Just my two cents.
 
M

MIREGMGR

#4
Years ago, I owned a company that made precision microgaussmeters. Probably not what you're doing, but similar enough from the point of view of calibration physics.

Our experience was that it was far easier to establish an effective calibration field geometry using active circuitry and a constructed coil system than with one or more permanent magnets. It's very difficult with a permanent magnet to know how far from the magnet the UUT is located, and whether some ferromagnetic object in the far field is affecting the near field enough to make a difference.

With a wound coil and readily controlled active drive, OTOH, we were able to show from physical principles and verify with measurements that our field geometry was constant over a sufficiently large volume that it was not necessary to precisely locate the UUT in x:y:z to achieve known and repeatable calibration conditions. We did of course have to precisely control the UUT in regard to angular orientation, which is unavoidable.

I don't know if that's helpful, of course. You probably just want to buy a calibration magnet and have that be a sufficient solution.
 

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#5
I have used a guass meter to measure to 30k Gauss. Some magnets may possibly be treated as reference materials. Now the question is whether those are charged or not.

Passing a high momentary current around the magnets (e.g., neodymium) will give them a high charge.

Charged or not, material, and other influences must be considered for uncertainty.
 
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