Automatic Hall Effect Test System

The experimental results are automatically calculated by the software, and the bulk carrier concentration, surface carrier concentration, mobility, resistivity, Hall coefficient, magnetoresistance, etc. can be obtained at the same time.

The DX-300 Hall effect test system consists of an electromagnet, an electromagnet power supply, a high-precision constant current source, a high-precision voltmeter, a high-precision source meter, a matrix card, a Hall effect sample holder, a three-dimensional micro-probe station, a television microscope, a standard sample, and system software.

System parameter

DX-300 Hall Effect Test System Configuration List

Introduction to each component of the DX-300 Hall Effect Test System

Name	Main technical parameters	Product picture
DXSBV-100 Electromagnet	1. The electromagnet is a double-yoke monotonic structure, placed upright, with a magnetic field in the vertical direction of the ground, a coil spacing greater than 95mm, a pole diameter of 100mm, and an adjustable magnetic field air gap range of 0~55mm; 2. A pair of pure iron pole heads are standard, and the diameter of the electromagnet pole head is 95mm. When the air gap is 20mm, the central magnetic field Hmax ≥ 1T; 3. The electromagnet adopts a natural cooling structure. When the pole spacing is 20mm and the magnetic field is 1T, the surface temperature rise of the coil is less than 40℃ after 30 minutes of continuous working time; 4. The electromagnet requires a DC power supply of 1.0KW; the electromagnet design resistance is about 9Ω, and the insulation resistance is better than 10MΩ. 5. The overall weight of the electromagnet is about 300Kg.
DX-F2030 Constant current power supply	1. Output voltage: effective output voltage range 0V-100V DC, open circuit output voltage is 120V ± 8V @10A; 2. Output current: –10A ~ +10A DC (current linear gradient rate 0.01A/s-2A/s continuously selectable); 3. High step resolution 0.1mA (1/100000 F.S.); 4. Accuracy > (0.2% setting value + 5mA), stability better than 0.1% @10A; 5. Noise/ripple: 10mA RMS typical value @10A; 6. RS-232 interface can digitally control polarity conversion, which is convenient for automated test process; 7. Interactive capability: white backlight FSTN LCD display, necessary LED status indicator, 3*4 key interactive function keyboard operation with display and indicator, standard RS-232C Computer interface and easy-to-use interface features, complete computer interface command set, timed continuous trigger output function during scanning; 8. Load protection function: instrument power failure protection, instrument over-temperature protection, instrument over-current protection, instrument over-power protection.
DX-150 Gauss meter	1. Range: ±0.1Gs ~ ±30kGs; 2. Resolution: 0.1Gs; 3. Accuracy: ±0.3% ±0.05% of reading; 4. Magnetic sensor thickness is 1.0mm and length is 60mm; 5. Human-computer interaction: bright widescreen high-definition LCD screen, 4¾-digit display, standard 9-pin "D" type RS232 connector; 6. Automation: complete computer instructions, which can monitor and control the magnetic field environment around the test sample in real time on the computer interface through data communication.
DX-320 System SourceMeter	1. Basic resolution of current output 0.0001uA, basic resolution of voltage measurement 0.0001mV; 2. Output range: 50.00nA-50.00mA, 0.1nA step-by-step continuously adjustable; 3. Measurement voltage: 0～±3V, large range test voltage meets the test of high resistance chip; 4. Built-in automatic conversion four-phase array card, which can realize automatic measurement of Hall effect Van der Pauw method; 5. Good human-computer interaction interface, convenient for users to make manual adjustments; 6. Complete host computer instructions, which can communicate with the computer to complete various operations.
3D micro motion platform + pressure needle	1. Probe holder: Quantity: 4; 2. Product model: LPPS003; 3. Adjustment accuracy: 10um; 4. Applicable probe diameter: ≤1mm; 5. Multi-purpose probe clamping direction: vertical/45°; 6. Wiring: 1m BNC triaxial single jumper; 7. L-type probe arm model: LPPS01AT Press needle selection: 8. Model: T05P5SG Needle rod diameter: 0.5mm, needle tip diameter: 5um, material: tungsten steel gold-plated probe Quantity: 8; 9. Model: T05P20SG Needle rod diameter: 0.5mm, needle tip diameter: 20um, material: tungsten steel gold-plated probe Quantity: 8; 10. Model: T05P50SG Needle rod diameter: 0.5mm, needle tip diameter: 50um, material: tungsten steel gold-plated probe Quantity: 8.
Video microscope	1. 4K resolution HD camera + 24-inch display; 2. Magnification: 21-135 times; 3. HDMI HD cable directly connected to the display for plug-and-play, 60 frames/second real-time video image transmission and viewing, clear image, stable signal, no flicker; 4. Built-in LED light adjustment button; 5. Built-in measurement and photography.
Upper computer software	1. One-key automatic measurement can be achieved. After the test starts, the measurement can be carried out without human operation; 2. The parameters of the relevant test samples are set in the software, and the automatic calculation of each parameter is realized after the test is completed; 3. I-V curve and B-V curve can be carried out in the software; 4. The modular design in the software is convenient for customers to use and develop related functions; 5. After the experimental results are measured, the data will be temporarily saved in the software. If long-term storage is required, the data can be exported to EXCEL table for later data processing; 6. The final test data and the data during the test can be saved for later data viewing; 7. Repeatable cycle test can be carried out automatically; 8. Automatic temperature control (variable temperature) test can be carried out without manual temperature change by the tester; 9. The change curves of various parameters and temperatures can be drawn; 10. Magnetoresistance test and resistivity test can be carried out separately; 11. Ohm test can be carried out on two sets of relative electrodes separately, which is convenient for customers to test contact performance and test current selection.
Supporting instrument	1. Gaussmeter sensor fixing bracket: All-aluminum non-conductive bracket, which can be adjusted up and down, left and right, front and back, so that users can adjust the sensor position according to their needs; 2. Magnetic field sensor probe fixing device: All-aluminum non-conductive bracket 5-70mm adjustable; 3. Corresponding tools for making ohmic contact solder joints on samples: electric soldering iron, indium sheet, solder, enameled wire, etc.; 4. 232 to USB serial port cable to realize communication between the test instrument and the host computer software.
Sample test bench	1. The sample stage can support 6-inch samples for testing; 2. The four-probe pressure point makes the operation and sample contact more convenient and firm; 3. The sample stage is fixed on the magnet bracket, so that the sample is in the same position each time it is measured, ensuring better measurement repeatability.