Agilent Technologies ENA Series

Chapter 3 45
Making Fault Location Measurements
Basic Measurement Procedures
Therefore, the measurement range is proportional to (the number of points- 1) and
inversely proportional to the span of the sweep range. To enlarge the measurement
range, use one of the following methods:
• Increase the number of points.
• Narrow the span of the sweep range.
NOTE When you change the above settings after performing calibration, you need to
perform calibration again.
The sweep range is expressed as time or distance. The time of the measurement
range
is as follows:
The distance of the measurement range
is expressed as follows using the velocity factor
and the speed of light in a vacuum
(3x10
8
m/s).
ΔF
F
span
N
meas
1–
-----------------------
=
T
span
T
span
1
ΔF
-------
=
L
span
V
c
L
span
Vc
ΔF
-------
=