f. Adjust L1104 (Fig. 6-34) until the oscillator shift range,
as the INT REF FREQ is rotated, is 1.2 kHz. The display is
the 200th harmonic of the 1 MHz signal. The range of the
INT REF FREQ control will also be related to the 200th
harmonic, so 1.2 kHz X 200 = 240 kHz. With 100 kHz/Div
dispersion this will equal 2.4 divisions.
g. Remove the P6040 Probe, attenuator and adapters, then
reconnect the coaxial cable between J120 and J109.
28. Adjust Band C Balance then Band A o
and B Balance
a. Equipment setup is as given for step 26.
b. Turn the INT REF FREQ control ON and the band
selector to band C.
c. Set the FINE RF CENTER FREQ control to its midrange
position.
d. Push the LOCK CHECK button and adjust the Band C
Bal R1140 for a centered trace.
e. Switch the band selector to B or A.
f. Push the LOCK CHECK button and adjust the A and
B Bal R1150 for a centered trace,
g. Check the DC balance between the level for band A
or B to band C by switching the band selector between B
and C. Adjust A and B, DC level to set level for band C.
6-31
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