IGBT Modules - Technologies, Driver and Application (Second Edition) - page 429

Fig. 12.1
Principles of thedesign of an analogueoscilloscope
There are, however, some disadvantages associated with the use of DSO, but these
can generally be avoided by careful application of some basic rules. On the other hand,
if these rules are neglected, the measurements are no longer able to have anything to
do with the original signal that was measured. Particularly in the area of power
electronics, where signals in the order of magnitude of several decades are measured
simultaneously, proper use of aDSO is critical toqualitymeasurement.
When the basic design of an analogue oscilloscope is compared with a DSO, the
fundamental difference becomes obvious:
An analogue oscilloscope maps the signal to be measured directly. The DSO samples
individual points of the signal to be measured and reconstructs the signal using the
measuring points as a signal picture.
Fig. 12.2
Principles of thedesign of a digital storage oscilloscope (DSO)
An important criterion in the decision to use aDSO is its resolutionwith regard to the Y-
axis. The resolution in the unit "bit" shows how precisely the input signal can be
converted to digital values. With a resolution of 8 bits, for example, the input signal will
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