HP 8568B, Performance Tests And Adjustments Manual, Page: 199 / 313

9. 3 Bandwidth Adjustments
IF CONTROL
\
Figure 3-45. Location of 3 Bandwidth Adjustments
9. Press MARKER Adjust marker to 3 point on opposite side
of signal (CRT MKR A annotation indicates 1.00 X). There are
now
two markers; one on each side of the signal at the 3 points.
10. CRT MKR A annotation now indicates
the
3 bandwidth of the 3
MHz bandwidth. 3 bandwidth should be 3.00 MHz.
11. Key in 1 MHz and
[
FREQUENCY SPAN
]
2 MHz. If necessary,
readjust [REFERENCELEVEL) and
FREQUENCY
),
using DATA
knob to place signal peak near top of graticule and centered on
center graticule line.
12. Press MARKER [OFF), then MARKER
13. Using DATA knob, adjust marker down one side of displayed signal
to the 3 point; CRT MKR A annotation indicates X.
14. Adjust 1 MHz for MKR A indication of 500 while
maintaining marker at 3 point X) using DATA knob. See
Figure 3-45 for location of adjustment.
15. Press MARKER Adjust marker to 3 point on opposite side
of signal (CRT MKR A annotation indicates 1.00 X). There are now
two markers; one on each side of the signal at the 3
point.
16. CRT MKR A annotation now indicates the 3 bandwidth of the 1
MHz bandwidth. 3 bandwidth should be 1.00 MHz.
17. Key in 300 and
SPAN
)
500 If
necessary, readjust
LEVEL
)
and
[
CENTER FREQUENCY
],
using DATA knob to place signal peak near top of graticule and
centered on center graticule line.
18. Press MARKER (OFF), then MARKER
19. Using DATA knob, adjust marker down one side of the displayed
signal to the 3 point; CRT MKR A annotation indicates X.
20. Adjust 300 for MKR A indication of 150 while
maintaining marker at 3 point X) using DATA knob. See
Figure 3-45 for location of adjustment.
2 1. Press MARKER Adjust marker to 3 point on opposite side
of signal (CRT MKR A annotation indicates 1.00 X).
Adjustments 3-85