The advantages of the two-point probe and concentric ring over the ordinary two probe multimeter
November 27th, 2013
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Working in the ESD industry, I get asked some interesting questions. One of the questions came from one of our customers regarding the advantages of using the two-point probe and concentric ring over the ordinary two probe multimeter?
A multimeter uses pointed instrument probes to measure between 2 points on a circuit assembly, or to measure continuity between 2 points. Depending on its design a multimeter measures AC & DC voltage, limited resistance — typically up to 40 Megohm (4.0×106 ohms), diode or capacitance attributes, etc.
- A Concentric Ring is designed to meet two specifications for measuring and classifying packaging materials for electronic applications: ANSI/ESD STM11.11 Surface Resistance and ANSI/ESD STM11.12 Volume Resistance of planar (flat) films, wraps, bags, etc. These are either area or volume measurements – nothing at all like measurements made with pointed instrument probes.
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