Frequency Mode - Agilent Technologies N9913A User Manual

 When finished changing ALL settings, press
DTF Measurement (Format)
You can select from 3 different DTF Formats.
 Press Measure 1
 Then choose from:
DTF Start and Stop Distance
In DTF measurements, you set the physical length of cable or other device to be
tested. The FieldFox calculates the frequency range of the measurement from
this distance. The longer the cable to be tested, the lower the frequencies that
are used. You can also set the frequencies manually using the Frequency Mode
[Bandpass] setting.
How to set Start and Stop Distance
 With a DTF measurement present, press Freq/Dist .
 Then choose from the following:

Frequency Mode

All DTF measurements are made with frequency settings and, using Inverse
Fourier Transform (IFT), the time and distance to faults are calculated.
NOTE The start and stop frequencies for the measurement are always annotated on the
screen below the start and stop distances.
How to set Frequency Mode
With a DTF measurement present,
32
Full (Default setting) Only the Settings table is shown on the screen. The
o
trace window is temporarily not shown.
Left The Settings table is shown to the left of the trace window.
o
Bottom The Settings table is shown below the trace window.
o
Distance to Fault (dB)
o
format, expressed as a positive number in dB.
Faults are displayed on the Y-axis in SWR. Learn more about
DTF (VSWR)
o
SWR at the FieldFox Supplemental Online Help:
http://na.tm.agilent.com/fieldfox/help/FieldFox.htm
then
More DTF Lin
o
format.
Enter a value using the numeric keypad, the ▲|▼ arrows,
Start Distance
o
or the rotary knob, then Enter. By default, the Start Distance is set to 0
Meters. This means that the measurement will display faults starting at the
point at which calibration standards are connected.
Stop Distance Enter a value between the start distance and 5 km (or
o
16,404 ft.) using the numeric keypad, the ▲|▼ arrows, or the rotary knob,
then Enter .
Done
Faults are displayed on the Y-axis in return loss
Faults are displayed on the Y-axis in linear (unitless)
to save your settings.
FieldFox User's Guide