New Product Arrival - SIMCO ST-4 Surface Resistance Tester
The SIMCO ST-4 surface resistance tester calculates resistance by measuring the current flowing across the surface of an object by applying a constant voltage between two parallel electrodes. It is placed directly on the surface of the material being tested (such as conductive mats or anti-static flooring). Utilizing a built-in parallel electrode design, it can quickly assess the surface resistance and grounding leakage resistance of ESD-protected materials. It has a wide measurement range and a built-in timer function to prevent battery depletion.
Its specific working principle is as follows:
Measurement Mechanism: When the ST-4 tester is placed on the material surface, the two parallel conductive electrodes at the bottom of the instrument contact the material. The built-in circuit applies a specified voltage (usually 10V or 100V, depending on the required range and material type). Due to the material's resistance, a corresponding weak current is generated. According to Ohm's law, the instrument calculates the surface resistivity and displays the measurement result via an indicator light.
Surface Resistance Test: The machine is placed directly on the surface being tested; the resistance value between the electrodes is the surface resistance of the material.
Grounding leakage resistance (system resistance) test: Insert the auxiliary power cord into the socket on the right side of the tester and connect one end of the cord to the grounding point. Place the tester on the conductive pad or other object to be tested. The total resistance from the object's surface to the grounding point (i.e., grounding leakage resistance) can then be measured.
This battery-powered instrument is simple, fast, and portable, making it ideal for routine maintenance measurements in ESD-protected areas.