Keysight N9912A User Manual page 36

Window Settings
Window settings provide the ability to choose between optimizing DTF
measurements for resolving closely-spaced faults or for the ability to measure low-
level faults.
How to select Window settings
 Press Meas Setup 4.
 Then Settings.
 Then press ▲|▼ arrows to move to the Window row.
 Then press Edit.
 Then press
 Then press
 Again press Done.
DTF Units
The DTF Units setting is available ONLY on the DTF Settings table.
By default, X-axis units for DTF measurement settings are displayed in Meters.
 Select DTF Units.
 Then choose from:
Calculated DTF values
 Press
Values noted on the FieldFox screen with c - <setting> :
Start Frequency – Start frequency that is used to calculate DTF.
Stop Frequency – Stop frequency that is used to calculate DTF.
Range Resolution. Indicates the accuracy of the distance to fault measurement. For
example, with range resolution of 500 mm, if the distance to fault is 10 meters, this
value could be inaccurate by +/- 500 mm or between 9.5 to 10.5 meters. This value
is calculated from frequency span / resolution (points).
Response Resolution, not displayed, indicates the distance that could be between
two faults and still show as separate faults. Learn more in Window Settings on page
36.
Maximum Distance. The distance that could be viewed with the current settings.
Defined by: Vf*c*Points/(2*Bandwidth) where:
36
repeatedly and choose from the following:
Window
Maximum – Optimized for dynamic range, the noise floor is lowered to provide
o
the ability to measure low-level responses. (Default setting)
Medium – Compromise between Min and Max window settings.
o
Minimum – Best Response Resolution, providing the ability to resolve between
o
two closely-spaced responses.
Done Edit.
M (meters)
o
Feet
o
on the DTF Settings Table to view the following calculated
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Vf = velocity factor
o
c = speed of light
o
FieldFox User's Guide