HP 8568B, Руководство по испытаниям и регулировке работы, Страница: 292 / 313

9. Impulse Bandwidth Adjustments
9. Impulse
Bandwidth
Adjustments
Reference
Related Performance
Test
Description
Equipment
Procedure
IF-Display Section
IF Control
Impulse Bandwidth Accuracy Test
The CAL OUTPUT signal is connected to the SIGNAL INPUT 1. Each
of the adjustable resolution bandwidths is selected and adjusted for
the proper impulse 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
5 MHz
3 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
Using the DATA knob, adjust the marker down one side of
the display signal to the 7.3
point; CRT MKR
A
annotation
indicates 0.430 X
Adjust 3 MHz for MKR In] indication of 1.5 MHz while
maintaining the marker at 0.430 X using the DATA knob. Refer to
Figure 4-8 for the adjustment location.
Press MARKER In]. Adjust the marker to the 7.3 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 7.3
point.
CRT MKR
A
annotation now indicates the impulse bandwidth of
the 3 MHz bandwidth. Impulse bandwidth should be 3.00 MHz
MHz
Key in 1 MHz,
[
FREQUENCY SPAN
)
2 MHz,
[
PEAK SEARCH
),
and If necessary, readjust by pressing
[
REFERENCE LEVEL
)
and using the DATA knob to place
the
signal
peak near the top of the graticule.
Press MARKER then MARKER [al.
Option 462 4-27