11. Press the Calibration key.
12. At the CALIBRATION menu display, use
the Menu up-down keys to highlight
START CAL, then press the Select key.
13. At the PRECISION RETURN LOSS
CALIBRATION menu display prompt,
connect the Offset SWR Autotester to In
-
put A, if you have not done so yet.
14. Connect the precision air line to the Off
-
set SWR Autotester test port. Position
the air line pointing vertically upward.
Downward or horizontal positions make
connector pin alignment difficult.
NOTE
Ensure that the bead-less end of
the precision airline is at the mea
-
surement connection point.
15. Press the
Select key when ready.
16. At the PRECISION RETURN LOSS
CALIBRATION menu prompt, connect
the Open to the bead-less end of the air-
line. Press the
Select key to start the cali-
bration.
17. Verify that the display resembles that
shown in Figure 5.
CAUTION
During both calibration and mea
-
surement, be sure to properly
align the bead-less connector of
the airline. When the connectors
are mis-aligned, a spike will usu
-
ally be visible on the display.
18. At the next menu prompt, remove the
Open and connect the Short to the
bead-less end of the airline. Press the
Se
-
lect
key to start the calibration process.
19. At the next menu prompt, remove the
Short and connect the 50 Ohm Termina
-
tion to the bead-less end of the air line.
Press the
Select key to start the calibra
-
tion process.
20. When the calibration is complete, remove
the 50 Ohm Termination.
21. Connect the SM/PL termination to the
bead-less end of the air line and press
the Select key to begin the measurement.
22. Observe that the waveform displayed re-
sembles that shown in Figure 6.
23. Press the
Cursor On/Off key to On.
24. Observe the Cursor menu readout. The
minimum return loss reading for the
SM/PL termination should be 42 dB.
Site Master S113C/S331C/S115BQ MM 7
1 0 . 0 d B / D I V O F F S E T1 : P R E C S N R L ( A )
2 : O F F
+ 0 . 0 d B
0 . 4 G H z / D I V
S T A R T : 0 . 0 1 0 0 G H z
4 0 1 p t s
S T O P : 4 . 0 0 0 0 G H z
L E V E L + 7 . 0 d B m
5 4 1 4 7 A
P R E C I S I O N
R E T U R N L O S S
C A L I B R A T I O N
C O N N E C T O P E N
T O A I R L I N E
P R E S S S E L E C T
W H E N R E A D Y
Figure 5. Example of a Good Connection
1 0 . 0 d B / D I V O F F S E T1 : P R E C S N R L ( A )
2 : O F F
+ 0 . 0 d B
0 . 4 G H z / D I V
S T A R T : 0 . 0 1 0 0 G H z
4 0 1 p t s
S T O P : 4 . 0 0 0 0 G H z
L E V E L + 7 . 0 d B m
5 4 1 4 7 A
C U R S O R
1 : - 4 6 . 0 2 d B
P R E S S S E L E C T
F O R
C U R S O R M E N U
2 . 4 0 5 0 G H z
Figure 6. Direct Readout of the Precision Return Loss
(28 páginas)
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