MAINTENANCE MANUAL
Site Master™ S120A, S235A, S250A, S251A
Antenna and Cable Analyzers
1.
INTRODUCTION
This manual provides maintenance instructions for
Site Master S120A, S235A, S250A, S251A Antenna
and Cable Analyzers. It describes the product and
provides performance verification procedures, parts
replacement procedures, and a replaceable parts list.
2.
DESCRIPTION
The Site Master (Figure 1) is a hand held S
21
(trans-
mission gain or loss), SWR/RL (standing wave ra-
tio/return loss), and Distance-To-Fault measurement
instrument. It combines a synthesized source, VSWR
Bridge, and receiver on a single printed circuit board
(PCB). An optional power monitor is also available. A
block diagram is shown in Figure 2.
3.
PERFORMANCE VERIFICATION
Paragraphs 4 through 9 contain tests that can be
used to verify the performance of the Site Master
models S120A, S235A, S250A, and S251A having
any version of firmware.
3.1.
Initial Setup for Testing
1.
Press and hold the
ESCAPE/CLEAR
key,
then press the
ON/OFF
key to turn on
the Site Master. (This sets the instru-
ment to the factory preset state.)
2.
Release the
ESCAPE/CLEAR
key and use
the Up/Down Arrow key to adjust the
contrast to give a readable display.
Site
Mast
er S251A
Figure 1.
Site Master S251A
490 JARVIS DRIVE
¨
MORGAN HILL, CA 95037-2809
P/N: 10580-00019
REVISION E
PRINTED: OCTOBER 2001
COPYRIGHT 1999-2001 ANRITSU CO.
