1、 Structural features

2、 Overview
2.1 Basic Functions and Standards: The ST2643 Ultra High Resistance Micro Current Tester (High Resistance Volume Resistivity Surface Resistivity Tester) is a multi-purpose comprehensive measurement device that uses the principle of the ring three electrode method to measure the volume resistivity and surface resistivity of solid sheet and thin film conductive materials, insulation materials, and can also be used as an ultra high resistance meter or micro current tester. The design of this instrument complies with the domestic standard GB/T 1410-2006/IEC 60093:1980: "Test Method for Volume and Surface Resistivity of Solid Insulation Materials".
2.2 Complete set of instruments: composed of the ST2643 high resistance instrument host, standard circular three electrode, connecting cables, and other parts. The host mainly consists of a high-voltage power supply, a micro current detector, and an embedded microcontroller system.
2.3 Advantages and characteristics:
1. The operation mode is digital, and all parameter settings and function conversions are input using a digital keyboard. It is easy to operate, stable in performance, and has a long lifespan, overcoming the shortcomings of traditional mechanical switches such as single function, high failure rate, and large volume.
2. Automation of the testing process, voltage and current range conversion, all digital electronic switches, can be manually/automatically selected, avoiding the disadvantages of traditional mechanical switch operation, especially the inability to automate and manual data post-processing.
3 double window result display, digital and diversified, directly displayed by digital meter head, avoiding reading errors of traditional analog meter head. Dual digital meter display, left window displays volume resistivity and surface resistance test results, right window displays test voltage, test current test conditions, and set correction factor, with complete content.
4. Testing safety protection, testing high-voltage independent operation switches, testing current overcurrent protection, effectively protecting the safety of instruments and operators from misoperation.
5. Convenient for functional expansion, with optional thin film testing probes that can test high resistance thin films, and optional fixtures that can be used as high resistance meters and micro ammeters. It can also test high resistance liquid resistivity.
2.4 Electrode or fixture selection: The instrument is equipped with standard circular three electrodes, suitable for general sheet and thin film samples. Customers can also prepare or customize electrodes to expand their applications, such as testing resistivity and surface resistance from cylindrical surfaces and cylindrical inner walls, testing high resistance components, and testing micro currents.
The instrument has the characteristics of high measurement accuracy, high sensitivity, good stability, high intelligence, compact structure, and easy to use.
2.5 Scope of application: The instrument is suitable for testing the resistance values of anti-static products such as anti-static shoes, anti-static plastic rubber products, computer room anti-static raised floors, and measuring the insulation resistance of insulation materials and electronic and electrical products in industrial and mining enterprises and research institutes. It can also be used for weak current measurements such as optoelectronic effects and device dark current measurements.

3、 Basic technical parameters
1. Measurement range and resolution
Resistance: 1.0 × 10²~2.0×10¹⁴ Ω, resolution 0.01×10²~0.01×10¹⁴ Ω
Resistivity: Kv × (1.0×10²~2.0×10¹⁴) Ω cm, resolution 0.01×10³~0.01×10¹⁴ Ω cm, K=1-1000, correction factor.
Block resistance: K □×(1.0×10²~2.0×10¹⁴) Ω/□, resolution 0.01×10³~0.01×10¹⁴ Ω/□, K □=34.5, correction factor.
2. Range division and error level

3 working power supply: 220V ± 10%, f=50Hz ± 4%, PW ≤ 20W
4. Overall dimensions: W × H × L=32cm × 13cm × 32cm
Net weight: ≤ 3.5kg
5 circular three electrodes and measurable sample size
The electrode is composed of three independent units:
5.1 The center is a cylinder with a diameter of 50mm and a height of 40mm.
5.2 The cylinder is surrounded by a circular ring with an inner diameter of 60mm, an outer diameter of 80mm, and a height of 40mm.
5.3 The bottom is a flat plate with a diameter of 100mm and a thickness of 10mm
The measurable sample size is greater than 90mm in diameter. The thickness is less than 10mm.
4、 For details, please visit the official website of Suzhou Lattice Electronics Co., Ltd http://www.szjgdz.com.cn Or
Refer to the Technical User Manual for ST2643 Ultra High Resistance Micro Current Tester
5、 Customer service hotline: 400-635-7098 QQ: 2851706351 Mr. Ding