Keysight N9938-90003 User’s Guide 101
Calibration for NA, CAT, and VVM Modes
— Configure and perform the calibration as usual. At the first step of the Cal
you will be prompted to connect a Load standard to one or both test ports.
— 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
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 40.)
—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:
If the first calibration step does NOT prompt you to connect Load standards,
then the Cal Kit probably does not contain an Isolation standard. You can
use DataLink software to edit the Cal Kit and add an isolation standard
using a Load standard. See Data Link Help for more information:
http://na.support.keysight.com/help/DataLinkHelp/DataLink.htm
To Next Page
Loading...
Need help?
General
