Agilent Technologies N9913A User Manual page 76

 This setting survives an Instrument Preset.
Waveguide Calibrations
In general, calibrating with Waveguide is very similar to calibrating with coax.
However, most coax mechanical Cal Kits have standards that can be used over a
very wide frequency range. Waveguide Cal Kits are used over a narrow frequency
range. Therefore, it is VERY IMPORTANT to set the frequency range 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
Agilent sells two waveguide Cal Kit series: the premium 11644A series and the
economy N9911X series. Both are available online at
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 select a DTF measurement.
 Press Meas Setup 4
 Then
 Set Media = Waveguide. Frequency Mode = BandPass is automatically
 Scroll down to Waveguide Definitions. Select the Waveguide Standard being
 Set Cable Correction = Auto. The Effective Velocity Factor is calculated
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.
 Press Meas Setup 4
76
(Learn how to use the Quick Settings table on page 22.)
Settings
selected for you.
used. If your waveguide standard is NOT listed:
Select User Waveguide. Then press Done.
o
Then DTF Cable Specifications, then
o
Cable.
Scroll to set Waveguide Definition and set VF Corr = Auto.
o
Then set the Min, Max, and Cutoff Frequencies.
o
automatically based on the frequencies of the waveguide standard. To override
this setting, set Cable Correction = Man.
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Edit/Save/Recall Cables, then
FieldFox User's Guide
Edit