The Pinion/Voyager model SRM/RTG Combination Surface Resistivity meter is a simple to use, highly repeatable measuring device for determining the surface resistivity of materials, as well as resistance to ground. The SRM/RTG incorporates a revolutionary three-point probe measuring technique, enabling accurate, consistent, and repeatable surface measurements. The principle of operation is as follows:
A voltage, V (30 Volts), is applied to each of the three outer probe contacts (Figure 1). The center probe contact (spring loaded) provides a ground return of the current supplied by the three outer probe contacts. The surface resistivity of the material being measured is expressed as ten to some power, written as Ohms/Square = 10^x; where “x” is rounded to the nearest integer by the SRM/RTG with the following exceptions:
The 10^5 range covers10^4 to 10^5.5. This allows the first display segment to indicate surface resistivities less than 10^4 Ohms/Square.
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