Center Freq = 1.80 GHz
The Loss value for the measurement is interpolated from the Freq/Loss pairs at
the Center Freq:
1 GHz = 0.1 dB/m
1.8 GHz = 0.18 dB/m
2 GHz = 0.2 dB/m
The correction for loss at 5 meters in one direction: 0.18 dB/m * 5m = 0.9 dB.
All DTF measurements correct for loss for travel down the DUT and back, so
double the correction: 0.9 dB * 2 = 1.8 dB.
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.
How to change DTF units
With a DTF measurement present, press Freq/Dist .
Then
The current selection is underlined
Calculated DTF values
Press
Values noted on the FieldFox screen with c - <setting>
Start Frequency – Start frequency that is used to calculate DTF.
36
Window
repeatedly and choose from the following:
Maximum – Optimized for dynamic range, the noise floor is lowered to
o
provide 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
o
between two closely-spaced responses.
Done
Edit.
DTF
Units.
Next Page
on the DTF Settings Table to view the following calculated
m (meters)
Feet.
FieldFox User's Guide