HP 8560A, Service Manual

Page: 62 / 450

4. IF Amplitude Adjustments
A5 Reference Attenuator Adjustment
12. Set the HP 3335A (AMPLITUDE) to -60
13. Connect a BNC cable between the
50
output of the HP 3335A and the HP 8560A
INPUT
14. On the HP press (CAL) and
REF LEVEL ADJUST.
Use the front-panel knob or step
keys to place the peak of the displayed signal 3 to 5 below the reference level.
On the HP 8560A press
[
PEAK SEARCH
]
and
MARKER DELTA.
Set the analyzer reference
level to -10
16. Change the HP 3335A to -10
17. On the HP 8560A press
18. Note the AMKR amplitude. Ideally, it should read 50.00 +/-.l
19. If the AMKR amplitude is less than 49.9 rotate (15 one-half
turn counterclockwise for each 0.1 below 50.00 If the AMKR amplitude is greater
than 50.1 rotate one-half turn clockwise for each 0.1 above 50.00 Do
not adjust more than five turns before continuing with the next step.
20. On the HP 8560A press
ADJ IF STATE.
Note the AMKR amplitude reading.
Set the HP 8560A reference level to -60 and press and
MARKERS OFF .
22. Repeat steps 12 through 21 until the AMKR amplitude reading is 50.00 +/-.l
A5 Adjustment Verification
23. On the HP disconnect W29 from Connect the test cable between and
the 50 output of the HP 3335A.
24. Set the HP 8560A reference level to -10
25. Set the HP 3335A to -5
On the HP 8560A press and
MARKER NORMAL.
27. The MARKER amplitude should read -10 +/-.13 If the reading is outside of
this range, repeat steps 4 through 21.
28. On the HP reconnect W29 to Press and set the controls as follows:
C E N T E R F R E Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz
REF LVL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RES BW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300kHz
29. Connect a BNC cable between the HP 8560A CAL OUTPUT and INPUT
30. On the HP press (CAL) and
REF LVL ADJ .
31. Use the knob or step keys to adjust the REF LEVEL CAL setting until the MKR reads
-10.00 +/-.l
32.
On the HP press
STORE REF LVL .
2-28 Adjustment Procedures