Abstract
Abstract Instruments commonly used for measuring electrical currents and potentials associated with corrosion of underground structures are described and their circuits explained. Considered are voltmeters, various kinds of potentiometer voltmeters and electrodes. Limitations of accuracy and fundamental principles of the use of instruments are given. Measurements described include resistivity and resistance, and special measurements, such as polarization current. Function and characteristics of combination instruments are described. Instruments are illustrated and schematic circuit diagrams given. 2.4.2
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