Tindun GM55 User Manual

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Digital Gauss/Tesla Meter

GM55

User’s Manual

SHANGHAI TINDUN INDUSTRY CO.,LTD

Tel. +0086-21-51873517

Fax: +0086-21-51561516

Email: testmeter@163.com

http://www.testmeter.com.cn

The Gaussmeter GM55 is a new generation of the Gaussmeter GM-2. It can be used to measure DC/AC magnetic field strength of permanent magnet materials, motors, speakers, magnetic sensors/ transducer and other machines and instruments etc. with high resolution.

1) Characteristics

- Wide measuring range and high resolution

- A low-cost measuring device, which is easy to operate, portable

and convenient to handle and store.

- Ideal for quick quality checks and comparative measurements,

with built-in polarity display.

2) Technical Data

Measuring ranges: 0~200mT and 0-2000mT Basic accuracy: DC: ±2.0%, AC: ±5.0% Resolution: DC x1: 0.00 ~ 200.00mT, 0.01mT

DC x10: 0.0 ~ 2000.0mT, 0.1mT AC x1: 0.00 ~ 200.00mT, 0.01mT AC x10: 0.0 ~ 2000.0mT, 0.1mT

Measuring magnetic field: DC/AC (static & dynamic 10Hz ~ 200Hz) Functions: Peak hold, Max hold,

automatic range Gs/mT selection

N/S pole display for DC measurement Automatic probe zero adjustment

Display: 4 ½ LCD

Display Unit: mT/Gs (1mT=10Gs)

Ambient temperature: +5°C ~ +50°C

Storage temperature: -20°C ~ +70°C

Relative humidity: 20% ~ 80%

Power supply: 1.5V AA 4pcs battery

Dimensions: 140mm x 64mm x 30mm

Weight: 300g

3) Accessories

1. +5V DC power supply connecting to 220V AC, 1pc

2. Tansevers Probe, 1pc

1 2

3. GMPT-5: transverse probe 1.5x 4 x 40mm, 1pc

4. Adapter,1pc

4) Special probes

GMPA-5: axial probe Ø6 x 40mm

5) Measuring Principle

The Gauss/Tesla meter works with a Hall Effect sensor/probe. There are two kinds of Hall probes: transverse and axial probes, which are used for different magnetization directions.

According to the Hall Effect, a voltage can be measured at right angle to the current path when a conductor or semiconductor with current flowing in one direction is introduced perpendicular to a magnetic field. The Hall voltage can be calculated from:

kHIHB

Where: VH: Hall voltage in volts

B: the applied field in Gauss

kH: sensitivity of the element in volts/Gauss I: bias working current in amperes

The initial use of this discovery was for the classification of chemical samples. The development of indium arsenide semiconductor compounds in the 1950's led to the first useful Hall Effect magnetic instruments. Hall Effect sensors allowed the measurement of DC or static magnetic fields with requiring motion of the sensor.

6) Measuring Method

The magnetic lines of the measured magnetic field should perpendicularly pass through the Hall Effect element of the Hall probe.

The sensing plan of the Hall sensor/probe should be positioned perpendicular to the magnetic field

Measurement of magnetic field in a space or gap

Put the concave side, i.e. the side with a small circle mark of the probe on the surface of the measured magnet or at the measuring point of a

Electric Charge

Hall Effect and its Electrical Parameters

Vertica

Incorrect use of Hall probe, too large measuring force, Easy damage the Hall probe!!

magnetic field carefully.

Front Panel

Measurement of surface flux density of a magnet

Measurement of AC magnetic field generated by AC current

7) Part and Functions

DC Magnetic field

AC Magnetic field

5: Power switch 6: Unit select

AC Mode mark

Peak hold

Pole display (DC)

Measuring value

Display unit

GM55 Digital

Gauss/Tesla Meter

1: Socket-outlet with 4 pins 2: LCD display 3: Peak max/min hold 4: AC/DC Mode

7: Zero/peak reset 8: measuring range

Measuring contact position

Protective tube

Hall sensor/probes

1) Socket-outlet: to connect the Hall sensor/probe to the measuring

2) LCD display: to display the field strength and pole direction (“N”

3) Peak max hold: to display and hold the peak/max value

4) AC/DC Mode: to select the measurement of AC or DC magnetic field

5) Power switch: to switch ON/OFF the measuring instrument

6) Unit select: to select the measuring and display unit

(Gauss or mT)

7) Zero/peak reset: to reset the measuring value and peak mode.

8) Range select: to select the measuring range 0-200mT or

0-2000mT

9) Plug of Hall probe: to connect the Hall probe to the measuring

instrument

10) Measuring circle mark: the side with this mark is the measuring side

of the Hall sensor. You should use this side to measure the surface magnetic field of permanent magnet. This side should be positioned perpendicular to the magnetic field

Using this side (without soldered connection) for measurement

Don’t use this side (with soldered connection) for measurement

Plug of Hall probe

instrument

north pole, “S“ south pole) and ~ AC mode mark etc.

Transverse probe

Axial probe

DC magnetic field

AC magnetic field

0-2000mT

0-200mT

8) Measuring Procedure

1) Install the 1.5V battery to the battery compartment or connect the +5V

power supply to the measuring instrument

2) Connect the Hall sensor/probe to the measuring instrument

Switch on the power of measuring instrument by pressing button (5),

LCD display shows 0.0mT

4) Select measuring range by pressing the button (8), the measuring

range changes between 0-200mT and 0-2000mT as follows:

5) Select AC/DC Mode by using the button (4), the display shows the

following DC or AC measuring mode:

“N” north pole, “S“ south pole for DC magnetic field

6) Select unit by pressing (6), unit changes between Gs and mT

7) Reset Gaussmeter. Keep the Hall probe faraway from magnetic field,

LCD display shows zero after pressing button (7) :

Note: You must reset the Gassmeter before you start a new measurement after you have changed the measuring range (8) and AC/DC Mode (4).

8) Select peak hold. You can select peak holding mode or normal

measuring mode by using button (3).

9 10

Unit: mT

Unit: Gs

Measuring instrument: 12 months

Hall sensor/probe: no guarantee.

9) Take off the protective tube of the Hall sensor/probe, position the

measuring circle mark (10) on the surface of the measuring object (such as permanent magnet), and read the display value (measuring value and pole display “N” or “S“). Note: the measuring circle mark (10) is measuring point of the Hall sensor. The pole is N pole if the display is “N” when this mark orients to the measuring object.

10) Reset peak hold mode. Under the peak holding mode the display

changes only when the actual measuring value is larger than the last peak value (displayed). Therefore you must reset the peak holding mode by using button (7) if you need to measure smaller magnetic field than the peak value. The device works still in peak holding mode after resetting.

Sample: last peak value: 1500mT, actual peak value 800mT after reset the peak holding mode

11) After the measurement please put the protective tube on the Hall

probe in order to protect the Hall element and switch off the power

12) The Hall probes delivered are compatible. The measuring accuracy

under using other changed Hall probes is ±2%.

10) Service

Please contact us for technical questions, repairing and

replacement etc:

SHANGHAI TINDUN INDUSTRY CO.,LTD

Tel. +0086-21-51873517

Fax: +0086-21-33321281

Email:sales@imeter.com.cn

http://www.testmeter.com.cn

Normal measuring mode

Peak holding mode