138 Keysight N9927-90001 User’s Guide
Calibration for NA, CAT, and VVM Modes
of the measurement WITHIN the frequency range of the waveguide Cal Kit.
Otherwise, an error message will appear during the ‘Calculating Steps’ portion
of the calibration.
Waveguide Cal Kits
Keysight sells two waveguide Cal Kit series: the premium 11644A series and
the economy N9911X series. Both are available online at www.Keysight.com
Effective Velocity Factor
Velocity factor is the speed at which an electromagnetic signal passes through
the transmission medium relative to the speed of light. This value is important
when distance is being calculated in DTF measurements (CAT mode) and Time
Domain (NA mode).
When the media is waveguide, the velocity factor changes with frequency.
FieldFox calculates this ‘effective’ velocity factor automatically. However, the
settings are different for CAT mode and NA mode.
CAT Mode - How to make Waveguide settings
These settings are necessary ONLY when making DTF measurements.
—Press Measure 1
then Distance to Fault (dB) to select a DTF measurement.
—Press Meas Setup 4
—Then Settings (Learn how to use the Quick Settings table in “How to view
and change Quick Settings” on page 48.)
—Set Media = Waveguide. Frequency Mode = BandPass is automatically
selected for you.
—Scroll down to Waveguide Definitions. Select the Waveguide Standard
being used. If your waveguide standard is NOT listed:
— Select User Waveguide. Then press Done
.
—Then DTF Cable Specifications
, then Edit/Save/Recall Cables, then
Edit Cable
.
—Scroll to set Waveguide Definition. The default setting is VF Corr =
Auto.
— Set the Min, Max, and Cutoff Frequencies.
—Press Done
, then press Back.
— Cable Correction = Auto is the default setting. The Effective Velocity Factor
is calculated automatically based on the frequencies of the waveguide
standard. To override this setting, set Cable Corr = Man.
NA Mode - How to make Waveguide settings
These settings are necessary ONLY when your measurement requires electrical
delay or port extensions, or if using Time Domain Transform.
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