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ADJUSTMENTS
ADJUSTMENTS
MODEL 8559A
5
-
23.
RF
GAlN ADJUSTMENT
REFERENCE:
A12 Schematic
DESCRIPTION:
The RF gain (sensitivity) of Step Gain Assembly A12 is adjusted by injecting a 21.4 MHz signal at
XAlOPl.
Third Converter Assembly A10 is removed and replaced with a special extender board for applying the 21.4
MHz signal from the signal generator.
DIGITAL VOLTMETER
SIGNAL GENERATOR
Dl SPLAY
(BLACK LEAD
EXTENDER BOARD
WITH 51.1 RESISTER
IN
XAlOPI
PWER
METER
FIGURE 5-9.
RF GAlN ADJUSTMENT TEST SETUP
EQUIPMENT:
.........................................................
Signal Generator HP 8640B
Digitalvoltmeter
........................................................
HP3456A
...........................................................
Power Meter HP 435A/B
PowerSensor
...........................................................
HP8481A
Special Extender Board
......................................
with 5 1.1 ohm resistor
HP
5060-0258/0757-0394
.......................................
TestCable,BNC(m)toBananaPlug HP 10111A
..............................................
Extender Cable Assembly HP 5060
-
0303
............................
Adapter, BNC
(f)
to Alligator Clips (2 required)
HP 8120
-
1292