what are normal gauss readings

[copperheadroads]

i just put my 3.0 gauss meter together ....thanks Elepro......
im using the A1203 sensor. i have been taking some readings of magnets & pickups i just fully charged some alnico 5 magnets ,my meter was reading 650 gauss is there a chart or something of what readings i should get ?

[belwar]

what type of magnets? Bar magnets? I have a chart at work I can send you if so.

[copperheadroads]

thanks ..humbucker bar magnets a5,a2,a3,a4,a8, & rod magnets pretty much everything .

[belwar]

Here's a few standard readings taken right at the end of the magnet

A2 - 578
A3 - 500
A4 - 700
A5 - 680
A5 ISO - 687
A6 - 724
A8 - 1456
A9 - 1620
Ceramic 8 - 1400
PAF Magnet original charge - 460
PAF Magnet Full Charge - 660

These are all .5 x 2.5 x .125 bar magnets. If anyone has any other magnets please let me know as i'll buy them and measure them and add to the list.

[RedHouse]

I really depends on the magnets themselves.

Getting a 650G off an A5 bar magnet is right in the ballpark, I've had A5 bar mags range from 380G - 770G.

[belwar]

totally agree with ^

[copperheadroads]

perfect!!!!!! thanks for the information guys

[tonedeciple]

Here's a few standard readings taken right at the end of the magnet

When you say the end of the magnet, I assume you mean the end of its 2.5" length on the north side?

[peskywinnets]

Old thread I know, but I've just lashed up a cheap & cheerful gaussmeter (ie a regulated 5V into an Allegro A1302, then its output into a DVM ....I then manually input the DVM reading into spreadsheet to get a gauss reading - hey, it's not slick but total cost was $2.00 & the results ought to be close enough for Govt work!).

I've no loose magnets to cross correlate the readings mentioned earlier in this thread against against. so just wondered if someone on here could kindly take a reading directly above a pickup at 'string height' for either a single strat type coil or bog standardish humbucker (ok, I know there's no such thing!) ie about 3-4mm above the pickup pole piece....or about 1/8" for those of you still on base 32/64 measuring systems!

I'm measuring about 192 Gauss at the top E 'string height' directly above a Johnny no name humbucker slug piece.

(failing that ....just measuring the top of a slug directly will help me!)

Oh, just one other thing, I'm assuming the 'sensor' interface is the lower part of the A1302 UA type case (as that's where I'm getting the strongest readings) - ie not the head/tip, or the side with the ID/Markings on)

[Mike Sulzer]

Old thread I know, but I've just lashed up a cheap & cheerful gaussmeter (ie a regulated 5V into an Allegro A1302, then its output into a DVM ....I then manually input the DVM reading into spreadsheet to get a gauss reading - hey, it's not slick but total cost was $2.00 & the results ought to be close enough for Govt work!).

I've no loose magnets to cross correlate the readings mentioned earlier in this thread against against. so just wondered if someone on here could kindly take a reading directly above a pickup at 'string height' for either a single strat type coil or bog standardish humbucker (ok, I know there's no such thing!) ie about 3-4mm above the pickup pole piece....or about 1/8" for those of you still on base 32/64 measuring systems!

I'm measuring about 192 Gauss at the top E 'string height' directly above a Johnny no name humbucker slug piece.

(failing that ....just measuring the top of a slug directly will help me!)

Oh, just one other thing, I'm assuming the 'sensor' interface is the lower part of the A1302 UA type case (as that's where I'm getting the strongest readings) - ie not the head/tip, or the side with the ID/Markings on)

Using a similar meter (A1322LUA with regulated 5V supply into a DVM) I get a bit over 100 gauss 3/32" over a brand X Japanese humbucker and about twice that over one of the strat pickups that S-M sells (Golden Age?)

If you want it more accurate than my memory, I can check them again tonight.

Maybe I have been doing this wrong, but I have been using the flat side, not the end or the rounded part.

[peskywinnets]

Maybe I have been doing this wrong, but I have been using the flat side, not the end or the rounded part.

Thanks - that's the side I'm using to measure too (ie the halls sensor's 'back face' - the opposite side to the writing/markings)

Your 100 gauss reading is way different to my readings .....I guess we should eliminate the 3/32"s bit and just ask if anyone could take a reading directly against the slug/polepiece top of ahumbucker or strat pickup?!

I'm sure I've the maths conversion right (ie 1.3mV per gauss) ....and my DVM is accurate - it's be nie to get some correlation going on with others' readings.

[Joe Gwinn]

The flat side is correct for Allegro magnetic field sensors.

[David Schwab]

...take a reading directly above a pickup at 'string height'...

You should be touching the pole piece (or magnet) with the sensor. Not above it.

[kevinT]

http://music-electronics-forum.com/t4515/

here is some tests that I did a while back.

[Mike Sulzer]

You should be touching the pole piece (or magnet) with the sensor. Not above it.

Why? If you are measuring an assembled pickup, the magnetic field that counts is where the string would be, and that is what you should measure to compare the field strengths of different pickups. If you are comparing different humbucker magnets, sure, measure against an edge that is a pole. But it is far better to measure the difference in a standard pickup to see what the magnets really do.