ST2242-3min-V1.0_20251010_14004131

5 month ago

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7 month

Product details

The ST2242 handheld AC four-probe tester is a resistivity testing instrument specially designed for samples that are not suitable for testing by the DC four-probe method. It is mainly used for ionic conductive substances (such as electrolyte solutions, conductive gels) and conductive powder suspensions (such as carbon powder, graphene powder slurry).

Adopting new digital and microprocessing technologies, the resistivity or resistance is measured by the precise 4-wire method and the simple 2-wire method. It has unique anti-interference ability and environmental adaptability, with good consistency in repeated tests, ensuring high precision, high stability and high reliability in long-term measurements. It is widely used in scientific research institutions and universities for testing the conductivity of gels, solutions, ionic conductive materials, and samples not suitable for direct current testing.

The ST2242 AC four-probe resistivity tester consists of a main unit, a test bench, test probes, etc.

2.Technical Specifications

2.1 General Specifications

Power and ability	Two. Four-wire measurement of resistance and resistivity;
Power source	DC 8.4V (Rechargeable lithium battery, large-capacity battery customized by the manufacturer)
Range	Resistance:：0.10Ω～100.0kΩ
Range	Resistivity: 2πS* (0.10Ωm to 100kΩm), (S pitch, unit m)
Measurement method	Four-probe method for measuring resistivity and simple two-wire resistance measurement
Short-circuit test current	AC ±20mA max
Open-circuit test voltage	AC ±20V max
Test the voltage waveform	Square wave (1KHz
Working temperature	-10℃～40℃；
Storage temperature	-20℃～60℃；

2.2 Basic Errors and performance Indicators under benchmark conditions

Measurement function	measurement range	accuracy	resolution
Resistance (R)	0.200Ω～2.000Ω	±5%rdg±5dgt	0.001Ω
	02.00Ω～20.00Ω	±3%rdg±3dgt	0.01Ω
	020.0Ω～200.0Ω	±3%rdg±3dgt	0.1Ω
	0200Ω～2000Ω	±3%rdg±3dgt	1Ω
	02.00kΩ～20.00kΩ	±5%rdg±5dgt	10Ω
	20.0kΩ～100.0kΩ	±10%rdg±5dgt	10Ω
Resistivity (ρ)	2πS*R,（ S=0.001 m/0.002m） The test range and error grade are classified in accordance with the R range

3. Working Principle

3.1 Measurement of Resistivity ρ

The 4-probe method is adopted: As shown in Figure 3-1, an alternating current I flows between C(H) (connected to the current electrode I+) and E(connected to the current electrode I-). Calculate the potential difference V between P(S)(voltage electrode V+) and ES(auxiliary electrode V-). Divide the potential difference V by the alternating current I to obtain the resistance value R of the sample. The electrode interval distance is S(m). The value of the sample resistivity is obtained according to the formula ρ0=2πS*R(Ωm). The interval between C(H)-P(S) is equal to that between P(S)-ES, both being S.

3.2 Instrument Usage environment and Storage Method

a. Temperature: T=0-40℃, relative humidity: RH≤60%

b. There should be no strong electromagnetic field interference in the studio, and it should not share power with high-frequency equipment.

c. Store in a cool, dry place free from corrosive gases.

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SUZHOU JINGGE ELECTRONICS CO., LTD.

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7 month

Main Product: Four-probe tester, Powder resistivity tester, Ultra-high resistance microcurrent tester , Resistor Tester, Quality resistivity tester, PN Type Identifier

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