Simco-Ion ST-4 and Simco-Ion FMX-004
The primary difference between the Simco-Ion ST-4 and Simco-Ion FMX-004 is their application: the ST-4 is a Surface Resistance Tester designed to measure conductivity and resistance, while the FMX-004 is a Portable Electrostatic Field Meter used to measure surface voltage/charge (
at 25mm).
Functions and Applications:
ST-4 (Work Surface Tester): Designed specifically for testing the resistance of ESD workbenches, floors, grounding systems, and insulating materials. Primarily used to verify that the electrostatic characteristics of work surfaces and grounding systems meet ESD standards.
FSX-004 (Electrostatic Field Meter): A portable electrostatic field tester used to measure the electrostatic voltage (V) and ion balance (IB) of an object's surface.
Measurement Parameters:
ST-4: Measures resistance (Ω/MΩ), capable of detecting point-to-ground resistance or point-to-point resistance.
FSX-004: Measures electrostatic voltage (V), up to ±30kV (using the probe), and has ion balance measurement capabilities.
Appearance and Operation:
ST-4: Compact design, includes a metal probe, and is placed directly on the work surface for testing.
FSX-004: Similar to a handheld test meter, with a digital display and bar graph display, using a sensor for distance measurement.
Working Principle:
ST-4: Measures resistance by applying a specified voltage to the surface probe, conforming to surface resistivity measurement standards. FMX-004: Utilizes a non-contact sensor to measure electrostatic field strength and convert it into voltage.
In short, the ST-4 is used to test the resistance of electrostatic protection equipment (workbenches, floors) to ensure ESD environmental compliance; while the FMX-004 is used to test the actual electrostatic voltage accumulated on products or equipment, detecting ion balance.