Handheld Digital Tesla Meter
1. General Description
The TD8620 Handheld Digital Teslameter is a field-portable unit that measures DC magnetic fields with direct digital readout in mT or G. The unit is designed for wide range, auto-range, high accuracy, and ease of use.
TD8620 includes three grade meters:
Accuracy of TD8620-1 is ±1% of reading
Accuracy of TD8620-2 is ±2% of reading
Accuracy of Td8620-5 is ±5% of reading
2. Technical Specification
2.1 TD8620-1
Range | 200 mT | 2000 mT |
Scope | Maximum calibration field 2400 mT, 24 kiloguas | |
Resolution | 10 μT | |
Accuracy | ±1% | |
Displa | 4 digit(in Decimal) | |
Power | Stud-snap Battery Operated, one section of 9 V battery | |
Operating environment | 0℃ ~ 50℃ | |
Storage temperature | -20℃ ~ 50℃ | |
Dimensions | 160 mm × 80 mm × 32 mm | |
Weight | 260 g(include battery and cable) | |
Hall probe | Transverse probe , with 1 m cable |
2.2 TD8620-2
Range | 200 mT | 2000 mT |
Scope | Maximum calibration field 2.4 mT, 24 kiloguass | |
Resolution | 10 μT | |
Accuracy | ±2% | |
Displa | 4 digit(in Decimal) | |
Power | Stud-snap Battery Operated, one section of 9 V battery | |
Operating environment | 0℃ ~ 50℃ | |
Storage temperature | -20℃ ~ 50℃ | |
Dimensions | 160 mm × 80 mm × 32 mm | |
Weight | 260 g(include battery and cable) | |
Hall probe | Transverse probe , with 1 m cable |
2.3 TD8620-5
Range | 200 mT | 2000 mT |
Scope | Maximum calibration field 2400 mT, 24 kiloguass | |
Resolution | 10 μT | |
Accuracy | 0~1000 mT: ±2% 1000 mT ~ 2400 mT: ±5% | |
Displa | 4 digit(in Decimal) | |
Power | Stud-snap Battery Operated, one section of 9 V battery | |
Operating environment | 0℃ ~ 50℃ | |
Storage temperature | -20℃ ~ 50℃ | |
Dimensions | 160 mm × 80 mm × 32 mm | |
Weight | 260 g(include battery and cable) | |
Hall probe | Transverse probe , with 1 m cable |
3. Features
1) The TD8620 is used for measuring magnetic flux density, rang 0~2400mT.
2) Three accuracy classes are optional: class 1, class 2, and class 5.
3) Users can switch the units G or mT by on the key.
4) Auto-zero, auto-range and maximum maintain functions.
5) Backlight adjusted, battery display, and auto power-off.
6) Light-weight, low power consumption, and multiple Hall probes are available.
4. Introducture
4.1 TD 8620 front panel key are defined as follows
Fig.01
1) ON/OFF: Turns power to the unit on/off.
2) Hold: Turn Max Hold feature on and off. Max Hold captures and displays the highest field reading.
3) Backlight: Turn backlight feature on and off. Backlight lighten up the LCD for reading.
4) NULL: Used to zero or null effects of ambient low level fields from the probe.When user pushes the NULL key ,"0000.0 G or 000.00 mT"displayed. The unit then automatically accepts whatever residual field it reads as a zero offset .
5) mT/G : Changes units from mT to gauss .Gauss is used in the cgs system :1 G=0.1 mT,mT is used in the SI system :1 mT =10 G.
4.2 LCD Display
Fig.02
4.3 Back Cover
Fig.03
When the stud-snap battery is used up, you should take the follow steps to replace it. Firstly, use a long-stemmed driver to remove off the screw which on the hole shown in the Fig 03. Secondly, unfasten the snap of the battery, then take a new battery replace of the old ,fasten the snap , screw on. Finally replace the battery door.
4.4 Axial and Transverse Probes
TB8620 can use either axial or transverse probe shown in follows:
Fig.04
CAUTION :Care must be taken when handing the probe .The tip of the probe is very fragile. Pressure the Hall sensor can alter its calibration. Don’t apply more force than is required to hold probe in place. So there is no excessive pressure which will tend to bend or depress the sensor substrate and destroy the Hall element inside.
4.5 Connect the Hall Probe
Fig.05
Plug the probe into the male connector at the top of the teslameter. Make sure that the groove of female connector with the probe and bump of the male connector be matched shown in Fig 05 . However, it is most important that certain precautions be taken when handing and installing probes so that they are not damage or destroyed ,and to preserve their accurate calibration.
4.6 Probe Operation
For best results , the instrument and probe should warm up for at least 10 minutes before operation. When magnetic field forward vertical cross the Hall sensor ,the polarity is positive(N)see Fig 06,or is negative (S).
Fig.06 positive(N) measurement
Probe readings are dependent on the angle of the sensor in relation to the magnetic field. The magnetic field should Vertical cross the sensor. Maximum output occurs when the flux vector is perpendicular to the plane of the sensor. The greater the deviation from Vertical orientation ,the larger error of reading.
Fig.07 Effect of Angle on Measurement
5. Application
1. Permanent magnet magnetic measurement
2. Mechanical parts remanence measurement
3. DC magnetic field source measurement
4. Magnetic separator working magnetic field measurement
5. Speaker magnetic field measurement
6. Permanent magnet separator working magnetic field measurement
7. DC motor working magnetic field measurement
8. Strong magnetic shielding magnetic leakage measurement
6. Packing
No. | Name | Unit | Remark |
1 | TD8620 Tesla meter | 1 | |
2 | Mercury-free alkaline dry battery | 1 | 9 V(prepared by customer) |
3 | Hall probe and test wire | 1 | Test wire is about 2m |
4 | Miniature screwdriver | 1 | cross |
5 | Operating instruction | 1 | |
6 | Package box | 1 |
