9. Impulse Bandwidth Adjustments
IF-Display Section
IF Control
Impulse 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 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 and press
Connect CAL OUTPUT to RF INPUT.
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 la] 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
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,
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
Option 462
