HP 8560E Service Manual

106 Chapter2
Adjustment Procedures
13. Demodulator Adjustment
Equipment
AM/FM signal generator ........ .......................................HP8640B
Oscilloscope .................................................................HP1980A/B
Adapters
Type N (m) to BNC (f) (2 required)................................1250-1476
Cables
BNC, 122 cm (48 in) ................................................ HP 10503A
Oscilloscope probe ... ....................................................HP10432A
Procedure
1. Press LINE to turn the spectrum analyzer off. Place the spectrum
analyzer in the service position as illustrated in Figure 2-18 on page
105.
2. Connect the oscilloscope probe from the oscilloscope channel 1 input
to probe A4C723 (the end closest to A4U707) as in Figure 2-19 on
page 107. Press
LINE to turn the spectrum analyzer on. Connect the
HP 8640B RF OUTPUT to the HP 8560E/EC INPUT 50Ω.
3. Set the HP 8640B controls as follows:
Range MHz .................................................................... 61 to128
Frequency ...............................................................100.000MHz
Output level ................................... .................................−10dBm
RF........................................................... ..................................ON
AM ..........................................................................................OFF
FM .......................................................... .................................INT
Modulation frequency ......... ......................... ...................1000Hz
Peak deviation ............................................. .......................5kHz
Scale FM ...........................................................................(k/MHz)
4. Adjust the HP 8640B FM deviation vernier for a full-scale reading
on the meter. Set the FM to off.
5. Set the oscilloscope controls as follows:
Channel 1 .............................................. .................................on
Channel 2 ...............................................................................off
Channel 1 ....................................... ...........................50mV/div
Channel 1 ................................................................................ac
Channel 1 .......................................................................BWlim
Time base ...................................... ............................1.0ms/div
Trigger ......................... .......................................................auto
Trigger source ..........................................................................1
Trigger level .......................................................................0.0V

HP 8560E Specifications

General

Brand	HP
Model	8560E
Category	Measuring Instruments
Language	English