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3. Preliminary Display Adjustments (SN 3001A and Below)
3. Preliminary
Display
Adjustments (SN
3001A and Below)
Reference
AlAl
Keyboard
AlA
Z-Axis Amplifier
A1
A4
X-Deflection Amplifier
AlA
Y-Deflection Amplifier
Note
Note
Adjustment 2, “High-Voltage Adjustment,” should be performed before
performing the following adjustment procedure.
Perform this adjustment only if components have been replaced on
the
AlA
Z-Axis Amplifier,
AlA
X-Deflection Amplifier, or
AlA
Y
Deflection Amplifier Assemblies. Components AlA2R22 HF GAIN,
AlABClO, AlA4R28 HF GAIN,
AlA4Cl0,
AlA4Cl1,
AlA5R28 HF
GAIN,
AlA5Cl0,
and
AlA5Cll
are factory adjusted and normally do
not require readjustment.
Description
The Al Display Section is adjusted to compensate the CRT drive
circuits for proper horizontal and vertical characteristics. These
preliminary adjustments are necessary only when a major repair has
been performed in the display section (for example, replacement or
repair of the
AlA
Z Axis Amplifier,
AlA
X-Deflection Amplifier, or
AlA
Y-Deflection Amplifier assemblies). For routine maintenance,
CRT replacement, or minor repairs, only adjustment procedure 4,
“Final Display Adjustments,” needs to be performed.
Caution
Be sure not to allow a high intensity spot to remain on the spectrum
analyzer CRT. A fixed spot of high intensity may permanently damage
the CRT’s phosphor coating. Monitor the CRT closely during the
following adjustment procedures. If a spot occurs, move it off-screen
by adjusting either the front-panel INTENSITY control, or the
horizontal or vertical deflection position controls.
Equipment
Digitizing Oscilloscope
....................................
HP
54501A
Pulse/Function Generator
..................................HP
8116A
1O:l
Divider Probe, 10
MW7.5
pF
(2
required)
...........HP
10432A
Display Adjustment PC Board
(setice
accessory]
...... .85662-60088
Termination, BNC 500
....................................
HP
11593A
Adapters:
Adapter, BNC tee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.1250-0781
Adapter, BNC(f) to
SMB(f)
. . . . . . . . . . . . . . . . . . . . .1250-1236
Adjustments 3-45