Section 3 - Derivation Of Resistivity Equations; Introduction; Calculating Resistivity - Keithley 8009 Instruction Manual

Derivation of Resistivity
3.1

Introduction

For instruments that do not directly measure resistivity, this section provides the
equations needed to calculate volume and surface resistivity using the applied
test voltage and the measured current. If accuracy is not needed, nomographs (see
figures 3-2 and 3-3) can be used to approximate resistivity. This section also
shows how to derive the equations used to calculate resistivity.
3.2

Calculating resistivity

The following equations used to calculate volume and surface resistivity are
based on the physical dimensions of the electrodes of the Model 8009. Section
3.4, Derivation of Resistivity Equations, explains how these equations are
derived.
Figure 3-1
Basic measurement techniques
Equations
3
13