AlphaLab Inc. DC Guassmeter Model 1

DC Gaussmeter Model 1

Background
Description
Photos
Helmholtz Coils
Permanent Magnets
GE Gauss Meter
AMY6 Magnetic Tester
Related
Links

Background

Related for my interest in things magnetic.

Description

This DC Guassmeter (Wiki: Magnetometer). It can measure both DC and AC fields.
Made by AlphaLab Inc (aka: Trifield)

In Fig 1 above the display is reading zero after the offset was set to 0000 using the LakeShore 4060 Zero Guass Chamber (also see: .
The display is showing 0000 on the 19,999 Gauss range. The Earth's magnetic field is about 50,000 nano Tesla or 0.5 Gauss. The Earth's field does not show up on the high range.

The low range is 1999.9 Gauss full scale, so the Earth's field can just be seen, but not really measured because there's only one digit changing and the stability of the zero adjustment is not that good. By placing a couple of 2-1/2" long nails, back to back on the sensor the reading can be multiplied by about 7 times making the maximum Earth's files show up as about 7 Gauss.

Placing the probe on the end of a K&J Magnetics DCX8 (3/4"dia x 1-1/2" cylinder, N43, Ni) causes an overflow indication (-1).

Photos

Helmholtz Coils (on it's own web page_

Permanent Magnets

Measuring some cylindrical magnets from K&J Magnetics:

Fig 1 The idea was to connect tree of the DCX8 (3/4" x 1-1/2") magnets in series and use pole pieces and a narrow
gap to generate a much stronger field, but it didn't work.

Why? let me know

Fig 2 reads 3678 Gauss in gap

Fig 3 Single magnet reads 5950 Gauss

Fig 4 Three small magnets read 5651 Gauss.

Fig 5 4127 Gauss in gap by making the gap about the same size as the probe.

Fig 6 Used the AMY6 Magnetic Tester to mark each magnet.

GE Gauss Meter & Reference Magnet

To use this meter you need to rotate it in order to get the peak torque on the needle.
When the probe is placed in the 2500 Gauss Standard Magnet it reads 2300 Gauss. I'm guessing the standard is not as strong now as it was over 50 years ago.
But the meter is still working!

GE Gaussmeter Fig 1
Meter: Cat. 409X59, N.P. 121010 What is N.P.? contact

GE Gaussmeter Fig 2
2500 Gauss
Standard Magnet
General Electric
Cat No. 415X3

Fig 3 Patent US2588143

2447880 Magnetometer, Seaver John D, Gen Electric, Aug 24, 1948, 324/259, 324/146, 324/154.00R, 324/151.00R - DC only

uses a small permanent magnet. The meter body is rotated to get maximum reading.

2588143 Gauss meter, Mendelsohn Lewis I, Gen Electric, Mar 4, 1952, 324/259, 324/154.00R - AC or DC

Makes use of CuNiFe material as described in patent 2196824, Permanent magnet consisting of copper, nickel and iron.
Unlike most magnets this material can be rolled into thin sheets where the magnetic grain is aligned, see Fig 2 above, and so very small magnetic needles can be formed. This metal alloy was used in the Fender Telecaster guitar pickup.

AMY6 Magnetic Polarity Tester

Fig 1

Fig 2 Rotate pocket clip 90 degrees to access battery compartment.
Install four batteries with positive (+) to black pocket clip end.
Note: battery polarity is shown on compartment cover.

Fig 3 Piezo beeper just under pocket clip at end.
Case halves cemented together so not easy to open.

Fig 4 Video of Wrong & correct use.

Marking

The box sticker:
AMY6
55300
Magnetic Tester
UPC: 6 81035 55300 8
General Tools & Instruments, New York, NY 10013

The tester:
sticker: 255118-201411

Data Sheet:
[un checked] MS-47PT
[checked] MS-47PT1 (with audible sound)
Batteries (1.5 V 4 each): LR44, 157, AG13, A76, L1154

This is a magnetic polarity tester that runs on four LR44 button cell batteries. A red (North) or green (South) LED turns on and a beep sounds to indicate the polarity of a magnet. This is handy to be sure you're connecting permanent magnets the way you intended.
~~The results are sort of ambiguous because the result depends on the orientation of the probe.~~ The probe is designed to be used end on, not on either side. See the above video to see the proper orientation of the probe.

Operation

Press button and move end of tester toward pole of magnet.
It is not correct to move either side of the tester to magnet pole.

HT20 2000 mT Magnetic Flux Meter - this instrument has very similar capabilities, bur for a much lower price
Sensors - Magnetic - Helmholtz Coil
Telegraph
Telephone
Telephone patents
Electromagnetic devices:

Build it YOURSELF!, a REAL ELECTRIC MOTOR
Electromagnetic Toy Engine
Gilbert DC 3-pole Electro-magnetic Machine
Leclanché Battery - wet cell
MESCO 1011 Toy Engine
No. 6 Dry Cell -
Toy Motor Kit & modern version as well as Science First demonstration motor -
Vibrators -
Weeden DC 2-pole Electro-magnetic Machine -

Walker Scientific MG-3D Gaussmeter -
Magnets
Magnatometers
DC Permenant Magnet Motors
Walker Scientific MG-3D Gaussmeter

Links

How to make the simplest magnetometer (or Gauss meter) - Lu Le Laboratory - Lu Le Laboratory - 84 turn solenoid coil driving Integrating Op Amp
LakeShore Fluxmeter downloads: Helmholtz coils

Helmholtz Coils - (Turns, Amps, Meters -> Tesla)

K&J Magnetics - permanent magnets

PRC68, Alphanumeric Index of Web pages, Contact, Products for Sale
Page created 4 April 2015

Fig 1 The idea was to connect tree of the DCX8 (3/4" x 1-1/2") magnets in series and use pole pieces and a narrow gap to generate a much stronger field, but it didn't work. Why? let me know	Fig 2 reads 3678 Gauss in gap	Fig 3 Single magnet reads 5950 Gauss
Fig 4 Three small magnets read 5651 Gauss.	Fig 5 4127 Gauss in gap by making the gap about the same size as the probe.	Fig 6 Used the AMY6 Magnetic Tester to mark each magnet.