Db Resolution Bandwidth Adjustments - HP 8566B Adjustment Manual

4-24 Option 462
IF-Display Section
6 dB 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. Position the instrument upright and remove the
Set the LINE switch to On and press (2--22).
2.
3. Connect CAL OUTPUT to RF INPUT.
4. Key in
(
CENTER FREQUENCY
5. Press
( )
REFERENCE LEVEL
signal peak near the top CRT graticule. The signal should be
centered about the center line on the graticule.
Press , MKR -+ [CF, and MARKER [nl.
6.
PEAK SEARCH
7. Using the DATA knob, adjust the marker down one side of the
display signal to the 6 dB point; CRT MKR A annotation indicates
Adjust A4A9R60 3 MHz for MKR [al indication of 1.5 MHz while
8.
maintaining the marker at .500 X using the DATA knob. Refer to
Figure 4-7 for the adjustment location.
Press MARKER a. Adjust the marker to the 6 dB point on the
9.
opposite side of the signal (CRT MKR A annotation indicates 1.00
X. There are now two markers; one on
the 6 dB point.
CRT MKR A annotation now indicates the 6 dB bandwidth of the 3
10.
MHz bandwidth filter. The bandwidth should be 3.00 MHz f0.60
MHz
11. Key in 1 MHz,
and (MKR). If necessary, readjust by pressing
and using the DATA knob to place the signal
( )
REFERENCE LEVEL
peak near the top of the graticule.
Press MARKER m then MARKER a].
12.
100 MHz,
] (
FREQUENCY SPAN
and adjust the DATA knob to place the
each side of the signal at
2 MHz,
( )
FREQUENCY SPAN
top cover.
5 MHz
]
( ),
PEAK SEARCH