HP 8340B Manual page 242

5-7.
YO MAIN DRIVER, ASS
Reference
Performance
Test: None
Service Section: Sweep Generator
—
YO
Loop
Description
The Main
Coil Driver circuit gain and offset are adjusted for the correct output frequency.
OUT
son LOAD
wsi
U
A45J3
J (OUTPUT OF
A45 DIRECTIONAL
COUPLER)
FREQUENCY COUNTER
Figure 5-15.
YO Main
Driver
ASS
Test Setup
Equipment
Frequency Counter
........
50Q
Termination, SMB(f)
...
Adapter, SMB (m) to SMB (m)
......
HP 5343A
HP P/N 1250-0676
HP P/N 1250-0669
Procedure
1.
Position the
DUT
in the test position as shown in Figure 5-15 with top and bottom covers removed.
Remove W3 (Figure 5-17) and connect the frequency counter to
W51 as shown
in
Figure 5-15.
Allow one-half hour for
warm up time.
2.
Remove cable W38 from A49J2 and connect
a
50 Ohm load
to the end of the cable.
3.
Set the DUT as follows:
a.
Press
[INSTR PRESET]
b.
Press
[CW]
then
enter
[2] [.] [3] [GHz].
4. Adjust
A55R47 (OFFSET, Figure 5-16) for an indication of 2.3
GHz ±1 MHz
on the
Frequency
Counter.
5.
Press the
DUT's [CW] key, then enter [6] [.] [9] [9] [9] [GHz].
6.
Adjust A55R4 (GAIN, Figure 5-16) for
an indication of 6.999 GHz ±1 MHz
on
the Frequency
Counter.
HP 8340B/41B
Adjustments