pointing vertically upward. Downward or hori-
zontal positions make connector pin alignment
difficult.
NOTE
Ensure that the beadless end of the pre-
cision airline is at the measurement con-
nection point.
15. Press the
Select
key when ready.
16. At the PRECISION RETURN LOSS CALI-
BRATION menu prompt, connect the Open to
the beadless end of the airline. Press the
Select
key to start the calibration.
17. Verify that the display resembles that shown in
Figure 5.
CAUTION
During both calibration and measure-
ment, be sure to properly align the
beadless connector of the airline. When
the connectors are mis-aligned, a spike
will usually be visible on the display.
18. At the next menu prompt, remove the Open and
connect the Short to the beadless end of the air-
line. Press the
Select
key to start the calibration
process.
19. At the next menu prompt, remove the Short and
connect the 50 Ohm Termination to the
beadless end of the air line. Press the
Select
key to start the calibration process.
20. When the calibration is complete, remove the
50 Ohm Termination.
21. Connect the SM/PL termination to the beadless
end of the air line and press the Select key to
begin the measurement.
22. Observe that the waveform displayed resembles
that shown in Figure 6.
23. Press the
Cursor On/Off
key to On.
24. Observe the Cursor menu readout. The mini-
mum return loss reading for the SM/PL termi-
nation should be 42 dB.
6
Site Master S113BQ MM
1 0 . 0 d B / D I V O F F S E T
1 : 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 T
1 : 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
