I realize that last suggestion was tongue-in-cheek, but there is a serious objection to any test where you could just put a magnetic sensor in different positions and get different readings. Magnetic coupling follows Faraday's Law, which says that the potential coupled to a victim loop is proportional to the time rate of change of magnetic flux impinging upon the loop. The time rate of change is fixed by the power type 50/60 Hz. The flux depends on the area of the victim loop and the angle that the magnetic field penetrates that loop. A Helmholtz or solenoidal coil gives a constant field vector (magnitude AND direction) that is critical in providing a repeatable test. It is very much the same philosophy as the 1.5 m square quiet zone in 1000-4-3.
---------- >From: Scott Douglas <[email protected]> >To: [email protected] >Subject: Re: Magnetics testing >Date: Fri, Jun 14, 2002, 12:06 PM > > > Lisa, > > Gee, could you maybe talk to your local power company and set up inside one > of their local distribution stations? With all those transformers, high > voltages and currents, I would think 80 gauss would be easy to find? > > Scott > > > At 11:13 AM 6/13/02 -0500, Ken Javor wrote: > >>I don't know labs who do this kind of work, but I don't think the original >>request is that "out there." I think more info is needed (at least by me). >>If this is at 50/60 Hz, I don't think it is that bad. Looks like around 100 >>Amps would be necessary. Not your typical Helmholtz coil, but not outside >>the bounds of reality. Depends a lot on the size of the test item. If it >>is small compared to a breadbox, then the 100 Amp number could come down >>substantially. >> >>---------- >> >From: Mike Cantwell <[email protected]> >> >To: [email protected] >> >Subject: RE: Magnetics testing >> >Date: Thu, Jun 13, 2002, 9:08 AM >> > >> >> > >> > >> > 30 to 80 Gauss is equivalent to about 6500 A/m. This is an enormous >> field!!! >> > >> > Do you have the right units? >> > >> > >> > >> > -----Original Message----- >> > From: [email protected] [mailto:[email protected]] >> > Sent: Thursday, June 13, 2002 6:40 AM >> > To: [email protected] >> > Subject: Magnetics testing >> > >> > >> > >> > Hello All, >> > >> > I am wondering if anyone knows of a test lab in the northeast capable of >> > generating a magnetic field strength of 30 to 80 Gauss? >> > >> > thanks >> > >> > Regards, >> > >> > Lisa >> > >> > Lisa A. 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