HP 8560A Service Manual page 53

Fast Zero Span Adjustments
22. Set A2R209 SWEEP OFFSET, A2R218 VIDEO OFFSET, A2R268 VIDEO GAIN and
these A2 adjustments.
23. Set the HP 355D Attenuator to provide 30 dB attenuation.
24. Press (-1 on the analyzer, and connect the equipment as shown in Figure 2-2. Set
the HP 8560A controls as follows:
C E N T E R F R E Q
SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz
REF LVL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4OdBm
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1kHz
VIDEO BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300Hz
Sweep time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 ms
25. Press
MARKER-B REF LVL
(SAVE), SAVE STATE,
Press
27. Set sweeptime to 10 ms.
28. (SAVE), SAVE STATE,
Press
29. Adjust A2R209 SWEEP OFFSET to place the beginning of the trace at the leftmost
vertical graticule line.
30. Adjust A2R271 SWEEP GAIN to place the end of the trace at the tenth vertical graticule
line (one division from the right edge of the graticule).
31. Press [AMPLITUDE) and press the (up) key seven times.
STATE1
the trace is lined up with the top graticule and in STATE2 the trace is lined up with the
eighth graticule (from the top line). Repeat until they align to within &0.2 divisions.
36. Adjust A2R209 and A2R271 until the start of sweep is aligned to the leftmost vertical
graticule line and the stop sweep is aligned with the right most vertical graticule line.
37. Press STATE2 STATE3.
and
STATE1
and
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz
If the marker is not at the top graticule, press
again.
STATE 0.
and
STATE 1 .
and
STATE 2.
, and
50 ms. Press ISAVE), SAVE STATE,
STATE 1 .
and
STATE2.
and Adjusting A2R268 and A2R218 so that in STATE1
The two traces should be aligned within +/-.l divisions.
. The two traces should be aligned within +/-.l divisions.
2. Display Adjustment
STATE 3 .
and
Adjustment Procedures 2-19