HP 8560A, Service Manual

Page: 107 / 450

8.
9.
20. Tracking Oscillator Adjustment (Option 002)
Record the frequency counter reading in Table 2-14 as
On the HP press
MAN TRK ADJ , (Hz. Rotate
the knob clockwise until the
FINE TRACK ADJ is set to 255.
10.
11.
12.
13.
14.
15.
16.
Record the frequency counter reading in Table 2-14 as F2.
Calculate
as shown below and record in Table 2-14.
F
Set COARSE TRACK ADJ to 25. This sets the tracking oscillator near the center of its
frequency range (the relationship between the COARSE TRACK ADJ dac number and
the output frequency is nonlinear). Adjust COARSE TRACK ADJ and FINE TRACK
ADJ until the frequency counter reads
Hz.
Record the values of COARSE TRACK ADJ and FINE TRACK ADJ in Table 2-14.
Adjust TRK OSC CTR until the frequency counter reads 300 MHz f500 Hz.
Repeat steps 7 through 14 at least once more until no further adjustment of TRK
OSC CTR is necessary.
Set the HP 8560A LINE switch off. Replace the dust cap screw on Disconnect all
cables from
17. Reinstall A10 in the HP 8560A.
Table 2-14. Tracking Oscillator Range Centering
TRACK ADJ
Adjustment Procedures 2-73