Anritsu S251C - Manual (Page 50)

Typical Line Sweep Test Procedures
This section provides typical line sweep measurements used to analyze the performance of
a transmission feed line system.
System Return Loss Measurement
System return loss measurement verifies the performance of the transmission feed line sys-
tem with the antenna connected at the end of the transmission line. To measure the system
return loss:
Required Equipment
q Site Master Model S251C
q Precision Open/Short, Anritsu 22N50 or
Precision Open/Short/Load, Anritsu OSLN50LF
q Precision Load, Anritsu SM/PL
q Test Port Extension Cable, Anritsu 15NNF50-1.5C
q Optional 510-90 Adapter, DC to 7.5 GHz, 50 ohm, 7/16 (F)-N (M)
Device Under Test
q Transmission Feed Line with Antenna
Procedure
Step 1. Press the MODE key.
Step 2. Select
FREQ-RETURN LOSS using the Up/Down arrow key and press
ENTER .
Step 3. Set the start and stop frequencies, F1 and F2, as described on page 3-2.
Step 4. Calibrate the Site Master as described on page 3-2.
Step 5. Connect the Device Under Test to the Site Master. A trace will be displayed on
the screen when the Site Master is in the sweep mode.
Step 6. Press SAVE DISPLAY (page 3-5) name the trace, and press ENTER .
NOTE: The antenna must be connected at the end of the transmission feed line
when conducting a System Return Loss measurement.
Chapter 4 Measurements
4-3