Chapter 3 41
Making Fault Location Measurements
Basic Measurement Procedures
Calculating Measurement Conditions
To use the transformation function efficiently, you need to make the following two
settings appropriately.
• Window
• Sweep conditions: frequency range and number of points
This section describes how to determine these conditions.
NOTE The VBA utility program for the fault location measurement, calculates and sets up
frequency sweep range to get the highest resolution available for the required
display distance range. See
“Fault Location Measurement Setup using the VBA
Utility Program” on page 54.
Effect of frequency sweep range on response resolution
Figure 3-1 shows an example when measuring the same cable while changing the
sweep span. When measured in a narrower sweep range, the overlap between 2
peaks is larger than when measured in a wider sweep range. By performing
measurement in a wider sweep range, adjacent peaks can be clearly separated,
which means that the response resolution is smaller.
Softkey Function
Bandpass Sets the conversion type to "band pass."
Lowpass Step Sets the conversion type to "low pass step."
Lowpass Imp. Sets the conversion type to "low pass impulse."
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