Keysight N9923A FieldFox User Manual page 58

Without compensation for the loss of the cable, a –20 dB response would be visible
at 100 meters, which is the OPEN at the end of the DUT. This is from 10 dB of loss
through the cable in each direction.
With compensation for the loss using the manufacturer's specification, the FieldFox
compensates the trace as though the signal traveling through 100 meters was
increased by +20 dB. Therefore the response will show 0 dB for 100% reflection.
How to enter Cable Loss and Velocity Factor
Cable Loss and Velocity factor can be entered using one of the following methods:
 Manually enter cable loss and velocity factor for the measurement.
 Select or create a cable file which contains the cable loss and velocity factor.
With a DTF measurement present:
 Press Meas Setup 4.
 Then
 Select
 Then:
How to Edit a Cable File
The FieldFox includes many predefined cable files with the manufacturer's
specifications. You can edit these files or create new cable files using the following
procedure or using the FieldFox Data Link Software. Learn more at:
www.keysight.com/find/fieldfoxsupport
The Cable correction data survives a Mode Preset and Preset.
With a DTF measurement present:
 Press Meas Setup 4
 Then
 Then
 Press
 Then
 Then use the ▲|▼ arrows to select a field,
58
DTF Cable Specifications
Cable Corr
Use Cable Loss and Velocity Factor values from a Cable file. See "How to
Auto
o
Edit, Save, and Recall a Cable File" below. This will overwrite a manually-
entered value.
Manually enter a value for Cable Loss and Velocity Factor.
Man
o
Using the numeric keypad, enter a value between 0.01 and 1.
Velocity Factor
o
Then press Enter.
Using the numeric keypad, enter a positive Cable Loss value in
Cable Loss
o
dB/m, then press Enter.
DTF Cable Specifications
Edit/Save/Recall Cables
then to clear all data from the existing DTF Cable table and reset
New Yes
header information to default settings.
to open the Cable Editor.
Edit Cable
When editing Cable Description information, press
o
selected field using the FieldFox labeler.
then modify the
Edit
FieldFox User's Guide