The principle of the three electrode method

The measurement principle of the three electrode method is to apply voltage to both ends of the sample using high and low voltage electrodes, measure the current flowing through the sample to calculate the volume resistance of the sample, and thus calculate the resistivity of the sample. At the same time, a grounding shielding electrode in contact with the surface of the test sample is set up around the low-voltage electrode as a third electrode, which directly introduces the surface current of the test sample into the ground to eliminate its influence on the measurement of body current.

Composition of volume surface resistivity tester

ZST-212Volume resistivity surface resistance testerIt mainly includes a testing host (including a DC stabilized power supply and an electrostatic current meter) and a three electrode device.

This measurement system can provide six test voltages ranging from 10V to 1000V, with 100V being commonly used for different test objects.

When measuring, the three electrode device as a whole needs to be placed in a shielding box (host) to create the electromagnetic shielding environment required for the measurement.

During measurement, a sample of appropriate size should be made and surface treated to ensure good contact with the electrode.

Technical Specifications

1、Resistance measurement range:1×10⁴ ～2×10¹⁷Ω

2Resistance measurement error: 1×10⁴～1×10⁹ Ω ±1%；

1×10¹⁰～1×10¹² Ω ±1.5%；

1×10¹²above ±5%

3Rated test voltage:10VThe50VThe100VThe250VThe500VThe1000V(Switch freely)

4DC voltage error: ≤50V±5%，>50V±1%

5Measurable volume resistivity, surface resistivity, and insulation resistance

6、Measure voltage and resistance ranges in multiple stages to ensure the accuracy of testing different levels of samples

7、Configure the test chamber andR_VTheR_SGear, good shielding effect, easy switching

9、Automatic discharge at the end of the experiment.

Applicable standard

GB/T 1410－2006 Test method for volume resistivity and surface resistivity of solid insulation materials

GB∕T 3048.5-2007Test method for electrical performance of wires and cables-Insulation resistance test

GB/T 31838.1.2.3.4-2019Dielectric and resistance characteristics of solid insulation materials (corresponding electrodes need to be selected)

GB/T 2439-2001Rubber, vulcanized or thermoplastic - Determination of electrical conductivity and dissipation properties - Electrical resistivity

GB/T 1692-2008Determination of insulation resistivity of vulcanized rubber

GB/T 10064-2006Experimental method for determining the insulation resistance of solid insulation materials

GB1672-88Determination of volume resistivity of liquid plasticizers

GB/T 16427-2018Measurement method for resistivity of dust layer

GB/T 12703.4-2010The Textile Industry Evaluation of electrostatic performance 第4Part: Electrical resistivity

IEC 61340-2-3:2016/COR1 :2023《ELECTROSTATICS–Part 2-3: Methods of test for determining the resistance and resistivity of solid materials used to avoid electrostatic charge accumulation

How to translateASTM D257-07《