Abstract
The measurement of high direct, alternating and impulse voltages, as well as the corresponding currents, is carried out mainly with measuring systems, in which digital recorders or other digital instruments are used. Analog measuring devices, e.g. impulse oscilloscopes or impulse voltmeters, have practically no more meaning and are not treated here. An important component of digital measuring instruments is the A/D converter, which digitizes the analog measurement voltage and provides it as a digital data set for further evaluation with the PC. The requirements for A/D converters vary according to the voltage type. For example, the recording of impulse voltages and currents requires high sampling rates, which can only be realized by fast flash converters with limited amplitude resolution. The chapter describes a variety of test and calibration methods to determine the characteristics of digital devices. For the accurate calibration and verification of digital measuring instruments, calibrators are used which generate AC, DC and impulse voltages of several 100 V up to 2000 V. The analysis of the recorded data is carried out with evaluation software, which is also subjected to a comprehensive evaluation using the test data generator (TDG).
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