HP 8340B Manual page 246
Synthesized sweepers
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- Operating manual (14 pages)
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5-8.
YO LOOP ADJUSTMENTS (Cont'd)
Equipment
Spectrum Analyzer
.............................................
HP 8566B
Spectrum Analyzer
.............................................
HP
3585A
Synthesized Sweeper
.................................
HP
8340B
Option
001
Oscilloscope
...................................................
HP
1741A
10:1
Divider Probe
............................................
HP
10004D
BNC
to
SMB
Snap-On
Test Cable (2
required)
.............
HP P/N 85680-60093
50Q
Termination,
SMB (f)
................................
HP P/N 1250-0676
Adapters:
APC 3.5
(f)
to
APC
3.5
(f)
................................
HP P/N
5061-5311
SMA
(m) to
BNC (f)
...................................
HP
P/N
1250-1200
SMB
<m) to
SMB
(m)
..................................
HP P/N 1250-0669
Special Test Fixture
...................................
Fabricated Locally
Procedures
YO LOOP RESPONSE
ADJUSTMENT
1.
Place the
DUT
in
the test
position
shown
in
Figure
5-18
and
remove the top
and bottom covers.
Disconnect
the rigid
cable (W3)
going into the
A45 Directional Coupler RF Output through
a
hole
in
the mother
board (top of the DUT). Put the YO Loop section
in
the Service
Position. Disconnect
all
the cables that connect to A48 and A49 PC boards.
Remove
the
A48 YO
Loop
Sampler assembly
cover. Connect
a
50 Ohm
load to
W38
at the end that connects to A49J2.
2.
Connect the test equipment as shown
in
Figure 5-18
(do
not connect
the Spectrum Analyzer
yet).
Set the LINE
switch to
ON and allow
V2
hour warmup.
3.
Set
the
Sweep
Generator as
follows:
a.
Press
[INSTR PRESET].
b.
Press
[CF] (center frequency) [1] [8] [7] [MHz]
c.
Press
[AF]
then enter
[2] [0]
[0] [MHz]
d.
Press [POWER LEVEL] then enter [3]
[dBm]
e.
Press
[SWEEP TIME]
then
enter [1] [0] [msec].
4.
Set the
oscilloscope controls as follows:
a.
Select
A
vs
B
mode
b.
Set Channel
A
to
0.05
VOLTS/DIV
(with
10:1
Probe)
c.
Set Channel
B
to
1
VOLT/DIV
(typically)
d.
Select DC coupled on
both channels.
5. On the oscilloscope,
adjust channel
B
VOLTS/DIV
(used as horizontal gain
in
A
vs. B
mode) for
a
trace of
10 horizontal divisions on the screen. Adjust the oscilloscope
POSITION
control to center
the display trace.
6. On
the
Sweep Generator
press
[M1]
and enter [1]
[6] [0] [MHz].
Press
[M2]
and enter
[2]
[1] [0]
[MHz].
7.
Adjust A48C1 and
A48C2
(Figure 5-19) for
a
trace
on the
oscilloscope similar to Figure 5-20. Adjust
for the flattest response from 160
MHz
to 210
MHz. The
amplitude of the
response
should be at
least 0.4 Volts
peak-to-peak.
5.44
Adjustments
HP 8340B/41B
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