9.
Use the Spectrum Analyzer marker to
measure the center of the response. The
frequency should be:
q
S120A: 1000 MHz
±
75 kHz
q
S235A: 2000 MHz
±
150 kHz
q
S250A: 2000 MHz
±
150 kHz
q
S251A: 1000 MHz
±
75 kHz
5.
TRANSMISSION/ISOLATION
VERIFICATION
The following test can be used to verify transmission
test port isolation and the accuracy of transmission
measurements. Measurement calibration of the Site
Master is required for this test.
a.
Equipment Required:
·
10 dB Attenuator, Weinshel 1R-10
·
30 dB Attenuator, Weinshel 1R-30
·
Open/Short, Anritsu 22NF50
·
50 Ohm Terminations,
Anritsu SM/PL or 28N50-2
Anritsu SM/PLNF or 28NF50-2
·
Armored Test Port Extension Cable,
1.5 Meter, N(m) to N(m),
Anritsu 15NN50-1.5A
b.
Procedure:
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.)
NOTE
Before continuing, allow a five
minute warm up for the internal
circuitry to stabilize.
2.
Press the MODE soft key.
3.
Use the Up/Down Arrow key to highlight
GAIN/INSERTION LOSS, then press
ENTER
.
4.
Press the SCALE soft key.
5.
Press the TOP soft key.
6.
On the keypad, press “0”, then press
EN-
TER
. (Verify the bottom limit is set to
–120 dBm.)
7.
Press the MAIN soft key to return to the
Main Menu.
8.
Press the OPT soft key.
9.
Press the B2 soft key to turn the limit
beep ON.
10.
Press the MORE soft key, then the
MAIN soft key to return to the Main
Menu.
11.
Press the SCALE soft key.
12.
Press the LIMIT soft key.
13.
Use the keypad or Up/Down Arrow key
set the limit to –85 dB (S120A) –80 dB
(S251A) or –75 dB (S235A and S250A),
then press
ENTER
.
14.
Press the MAIN soft key to return to the
Main Menu.
15.
Press the
START CAL
key.
16.
Follow the instructions on the display to
perform a OSL-THRU-ISOL calibration
using a 22NF50 Open/Short, 28NF50-2
or SM/PLNF Terminations, and
15NN50-1.5A Test Port Extension Cable
(refer to Figure 3).
Site Master MM
3
Figure 3.
OSL-THRU-ISOL Calibration Setup
