HP 8568B, Руководство по испытаниям и регулировке работы, Страница: 289 / 313

9. 6 Resolution
Bandwidth
Adjustments
Reference
Related Performance
Test
Description
Equipment
Procedure
IF-Display Section
IF Control
6 Resolution Bandwidth Accuracy Test
The CAL OUTPUT signal is connected to the RF INPUT. Each of the
adjustable resolution bandwidths is selected and adjusted for the
proper bandwidth.
No test equipment is required for this adjustment.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Position
the
instrument upright and remove the top cover.
Set the LINE switch to On, press
PRESET
)
and select
SIGNAL INPUT 1.
Connect CAL OUTPUT to SIGNAL INPUT 1.
Key in
(
CENTER FREQUENCY
)
100 MHz,
[
FREQUENCY SPAN
)
5 MHz
MHz, and
Press
[
REFERENCE LEVEL
)
and adjust the DATA knob to place the
signal peak near the top CRT graticule. The signal should be
centered about
the
center line on the graticule.
Press
PEAK SEARCH
, MKR and MARKER (al.
Using the DATA knob, adjust the marker down
one
side of
the
display signal to the 6 point; CRT MKR A annotation indicates
x
Adjust 3 MHz for MKR In] indication of 1.5 MHz while
maintaining the marker at X using
the
DATA knob. Refer to
Figure 4-7 for the adjustment location.
Press MARKER Adjust the marker to the 6 point on the
opposite side of the signal (CRT MKR A annotation indicates 1.00
X. There are now two markers; one on each side of the signal at
the 6
point.
CRT MKR A annotation now indicates the 6 bandwidth of the 3
MHz bandwidth filter. The bandwidth should be 3.00 MHz
MHz
Key in 1 MHz,
SPAN
)
2 MHz,
(
PEAK SEARCH
),
and If necessary, readjust by pressing
LEVEL
)
and using the DATA knob to place the signal
peak near the top of the graticule.
Press MARKER then MARKER
4-24 Option 462