# Permanent magnet question

L

#### lerameur

Jan 1, 1970
0
Hello,

I have a permanent magnet and I just finish building myself a
gaussmeter. However it shows me that every magnet I measure has a
higher gauss level for the south then the north. Do magnet have
different magnetic field strength for south and north pole, ?
it could also be my gaussmeter...

k

J

#### Jasen Betts

Jan 1, 1970
0
I have a permanent magnet and I just finish building myself a
gaussmeter. However it shows me that every magnet I measure has a
higher gauss level for the south then the north. Do magnet have
different magnetic field strength for south and north pole, ?

it's possible but there's no rule that favours either pole.
it could also be my gaussmeter...

most likely.

build (or find) a solenoid (eg take the secondary winding
of a dead wall-wart transformer) and measure the gauss it
produces with the same known current flowing through it
in either direction.

Be aware that the earths magnetic field has a vertical
component in most locations.

Bye.
Jasen

L

#### lerameur

Jan 1, 1970
0
Your gauss meter is not symmetrical through zero gauss, I
suspect. Try measuring a single pole with the the probe
turned each way, to see its asymmetry.

I calibrated at zero gauss. So when there is no magnetic field present
I took this value as zero Gauss, then I use 1000 gauss as the highest
value for 4.8v using the linear formula y=mx+b .

Ken

L

#### lerameur

Jan 1, 1970
0
Have you checked the linearity? I think I would try to
compare the signal to a current that produced the magnetic
field with a gapped inductor, with the probe in the gap, and
the inductor fed with AC. A scope Lissajous pattern would
display the linearity very simply.http://en.wikipedia.org/wiki/Lissajous_curve

What is an air gap inductor?

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