Measured Distance - the Effects of Frequency and Points

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It is not always obvious how frequency range affects measured distance and resolution, and it often appears to be counter-intuitive. If you are new to making Distance to Fault measurements, this section will help clarify what is happening.
In the following equations
The Speed of Light ('c') is a constant value of 3 * 10 to the power 8 meters per second.
Your test cable's transmission speed (relative to light) is V_Rel
The Measured Distance (in meters) of the DTF measurement is determined by the following equation:
   
Measured distance (in meters) = (¹/₄ * Number of points * c * V_Rel) / Freq. Span
   
   
You can see from this equation that:
To increase the measured distance:
- you can increase the number of points, or
- you can reduce the frequency span.
To reduce the measured distance:
- you can reduce the number of points, or
- you can increase the frequency span.