Abstract
A program for measuring the differential resistance of varistor materials by scanning digital images of analog oscillograms is described. The program was created using the languages HTML, CSS, JavaScript and Canvas technology. The software environment for its execution are Internet browsers. The program can be used to measure linear resistance, which limits the nonlinearity of current-voltage characteristics of varistor materials at high electric currents.
Highlights
A program for measuring the differential resistance of varistor materials by scanning digital images of analog oscillograms is described
The efficiency of overvoltage protection is significantly influenced by the linear volume resistance of zinc oxide grains in varistor material
In [3] a method for measuring the specific linear resistance ρlin which limits the nonlinearity of current-voltage characteristic of varistor materials at high electric currents was proposed
Summary
A program for measuring the differential resistance of varistor materials by scanning digital images of analog oscillograms is described. In [3] a method for measuring the specific linear resistance ρlin which limits the nonlinearity of current-voltage characteristic of varistor materials at high electric currents was proposed. This method is based on the concept of differential resistance. The method allows determining the value of ρlin by data obtained at measurement of the differential resistance of varistor material at high electric currents. In this case it is necessary to register the CVC of varistor material with high accuracy This can be done using the digital images of oscillograms of voltage and current pulses recorded with a two-beam analog storage oscilloscope [4]. The software environment for programs created by these means can be any internet browser
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