Technical Specifications
- Magnetic field: 6000Gs at 20mm gap
- Sample current: 10nA~1000mA (minimum adjustable current: 0.1nA)
- Measurement voltage: 0.1uV~10V
- Provides various standard test materials and Hall devices of different grades (varying sensitivity and accuracy)
- Minimum resolution: 0.1GS
- Magnetic field range: 0-±10000Gs
- Can communicate with a computer via a gaussmeter or data acquisition board
- I-V curve and I-R curve measurement, etc.
- Carrier concentration: 5X10^12~5X10^22 cm^-3
- Hall coefficient: ±1X10^-2~±1X10^6 cm^3/C
- Resistivity: 5X10^-5~5X10^3 Ω·cm
- Mobility: 1x10^1~1X10^5 cm^2/Vs
- Fully automated testing, one-click operation
- Professional ohmic contact kit
System Components
1. High-Precision Constant Current Source
The JH401 digital constant current source is suitable for high-precision current output and voltage measurement applications. It integrates a variety of the latest high-tech digital technologies, with a current output range from 0.2mA to 100mA and a voltage measurement range from 0 to 10V. It features auto-zero, auto-ranging, and selectable hold modes for maximum, minimum, peak, and valley values. The instrument can measure and display 7 parameters simultaneously. It has an RS-232M interface for real-time data transmission to a host computer. Designed and manufactured according to ISO-9000 standards. Bright VGA color graphic display, excellent self-plotting graphic display function, full menu operation, 5 ¾ digit reading, ultra-high resolution of 1/300000, allowing observation of 0.0001mV weak changes in voltage measurement, maximum range 30V. It has large-capacity data storage and data reading with time-based query. Professional plotting software can draw charts based on voltage values. Optional remote control system. Products are mainly sold to metrology units, research institutes, universities, and R&D departments of large enterprises.
Ø High precision, high resolution
The JH401 constant current source uses a high-precision digital instrument, achieving basic accuracy: ±0.005%, basic current output resolution of 0.0001mA, and basic voltage measurement resolution of 0.0001mV, reaching world-class levels.
Ø Intelligent, multifunctional
The JH401 constant current source can measure DC voltage, with features such as max/min/peak/valley hold, interface lock, data storage (auto/manual)/data reading, excellent self-plotting and test graphic display, auto-zero, auto/manual ranging, threshold setting and alarm, time and brightness self-setting, and many other intelligent functions.
Ø High automation
The JH401 has rich interface features suitable for automatic measurement systems. RS-232M interface function: digital output of test data.
l Users can use a computer to read test data and utilize professional plotting software to draw various measurement charts, which can be sent and printed.
l Real-time serial data transmission allows real-time monitoring of data on the computer.
l A fixed instruction set can be used to query real-time data.
Ø High consistency
The JH401 has high stability and consistency, with consistency up to 0.01% (stable electric field).
Ø Current output specifications
Number of output channels: 6
Basic resolution: 0.0001mA
Output range: 0.2000mA-100.0000mA
Ø Voltage measurement specifications
Number of input channels: 1
Measurement accuracy: ±0.05% of reading ±0.005% of range
Measurement range: 0-10V, measurement resolution: 0.0001mV
2. High-Precision Magnet Power Supply
Ø Bipolar constant current output
① The power supply output current can vary continuously between positive and negative rated maximum current.
② Current can smoothly cross zero without switching commutation.
③ Output current and voltage operate in four quadrants (suitable for inductive loads).
④ Current ramp rate adjustable from 0.0007 to 0.5 F.S./s (F.S. is rated maximum output current).
Ø High current stability, low ripple
① Current stability: better than ±25ppm/h (standard); better than ±5ppm/h (high stability).
② Current accuracy: ±(0.01% of setting + 1mA).
③ Current resolution: 20 bit, e.g., for a 15A power supply, current resolution is 0.03mA.
④ Source effect: ≤ 2.0×10^-5 F.S. (output current change when supply voltage varies by 10%).
⑤ Load effect: ≤ 2.0×10^-5 F.S. (output current change when load varies by 10%).
⑥ Current ripple (RMS): less than 1mA.
3. Laboratory Electromagnet
1. Pole diameter: 73mm
2. Pole face diameter: 60mm (standard)
3. Magnetic gap adjustment: bidirectional adjustable
4. Magnetic gap adjustment range: 0-82mm
5. Coil DC resistance: 5.3Ω
6. Coil spacing: 83mm
7. Maximum operating current: ±7A
8. Voltage: ±37V
9. Input power: 0.26kW
10. Magnetic field strength: >10000Gs@10mm
11. Mounting orientation: U-opening upward
12. Weight: 46kg
4. Built-in Gaussmeter
1. Range: 0 to 3T
2. Accuracy: ±(0.1% of reading + 2Gs)
3. Resolution: 0.01Gs (1uT)
5. Test System Software
Position acquisition, digital temperature display, I-V curve and I-R curve measurement, obtaining bulk carrier concentration and various parameter curve graphs.
Sample testing:
Set the control current, magnetic field, and Hall sample thickness, click the "Start Test" button, and the software will complete the one-click test process until all Hall parameters are calculated. After each test, you can choose to save the calculated results, then click the "Clear Display" button to proceed to the next test. If the magnetic field is kept constant and the control current is varied, the relationship between Is and VH can be observed through plotting. If the control current is kept constant and the magnetic field is varied, the relationship between B and VH can be observed through plotting.
6. Hall Sample Holder
Used to fix and solder Hall devices. Four-probe pressure points ensure convenient and reliable contact. High-precision gaussmeter: resolution: 0.01Gs, range: 0 ~ ±3T, accuracy: 0.1%, standard 232 digital interface and control port.
Ohmic contact kit:
Professional indium sheets for ohmic contact and corresponding soldering kit, standard material samples, silicon wafers, gallium arsenide 2 resistance: 300-500 ohms.
