S331L UG PN: 10580-00321 Rev. M 3-11
Cable and Antenna Measurements 3-4 Line Sweep Measurements
The following describes the main steps to follow when making Return
Loss or VSWR measurements.
1. Press the Measurement main menu key and select Return Loss or
VSWR.
2. Press the Freq/Dist main menu key and enter the start and stop
frequencies.
3. Press the Amplitude main menu key and enter the top and bottom
values for the display or press Fullscale.
4. Press the Calibration main menu key and perform a calibration of
the instrument. Anritsu suggests using a phase-stable test port
cable. See Chapter 7 for details.
5. Connect the Site Master to the Device Under Test using the
calibrated phase-stable test port cable.
6. Press the Marker main menu key and set the appropriate markers
as described in “Markers” on page 3-37.
7. Press the Limit main menu key to enter and set the limit line as
described in “Limit Lines” on page 3-31.
8. Press Save (7) then Save to save the measurement to memory.
Refer to “Save File” on page 8-2 for details on setting the save
location.
Cable Loss Measurement
Cable loss sweep is made when a short is connected at the end of the
transmission line. This insertion loss test allows analysis of the signal
loss through the transmission line and identifies problems in the
system. High insertion loss in the feed line or jumpers can contribute to
poor system performance and loss of coverage.
Different transmission lines have different losses, depending on
frequency and distance. The higher the frequency or longer the
distance, the greater the loss. This measurement returns the energy
absorbed, or lost, by the transmission line in dB/meter or dB/ft. The
average cable loss of the frequency range is displayed on the screen in
the measurement settings summary area.
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