44 Chapter 3
Making Fault Location Measurements
Basic Measurement Procedures
Figure 3-3 Effect of window on response resolution
Effect of the transformation type on the response resolution
Although both transformation types, band pass and low pass impulse, simulate the
response of the impulse signal, the impulse width in the low pass impulse mode is
half the width in the band pass mode. Therefore, the resolution is better in the low
pass mode. If the DUT can be measured in the low pass mode, response data with
better resolution is obtained in the low pass mode.
Measurement range
In the fault location function, the measurement range means the range within which
the response can be measured without repetition. The repetition of the response
occurs because measurement in frequency domain is performed discretely instead of
continuously. The measurement range is inversely proportional to the frequency
difference between adjacent measurement points. The frequency difference between
measurement points
is expressed as follows using the span of the sweep frequency
and the number of points
.
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