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Model 8660C
Operation
3-1. INTRODUCTION
3-2. This section provides operating instructions
for the Hewlett-Packard Model 8660C Synthesized
Signal Generator mainframe for both the local and
remote modes.
3-3. The Model 8660C is designed to provide
precise digitally controlled signals for use in plug-in
sections which provide the selected output fre¬
quency with the chosen modulation parameters. It
will be necessary to have the operating manuals for
the plug-in sections being used in order to effic¬
iently operate the instrument.
NOTE
If a Modulation plug-in Section is not
used it will be necessary to have an
Auxiliary Section in place of the Modul¬
ation
Section.
The Auxiliary Section
completes a signal path from the main¬
frame to the RF Section plug-in and also
provides a means of modulating the RF
Section from an external source.
3-4. PANEL FEATURES
3-5. Front and rear panel controls, indicators and
connectors of the 8660C are shown, and their
functions described, in Figure 3-1.
3-6. OPERATOR'S MAINTENANCE
3-7. Operator's maintenance of the Model 8660C
Synthesized Signal Generator mainframe is limited
to fuse replacement.
3-8. OPERATING PRINCIPLES
3-9.
The Model 8660C may be operated by front
panel controls in the local mode or externally pro¬
grammed in the remote mode. Allow the system to
warm up for 15 minutes before operating.
j WARNING I
The power requirements and safety pre¬
cautions listed throughout this Manual
must be observed to preserve the built-in
safety features of the Model 8660C.
3-10. LOCAL OPERATION
3-11. In the local mode of operation, all functions
of the mainframe are controlled by front panel
controls, except when an external reference oscil¬
lator is used. When an external reference oscillator
is used, the rear panel SELECTOR switch must be
in the EXT position.
3-12. The 20-key keyboard may be used to:
a.
Select any frequency within the range of
the RF Section plug-in in 1 Hz increments (above
1300 MHz, 2 Hz increments) for standard instru¬
ments. Option 004 instruments are selectable in
100 Hz
increments
(above
1300 MHz, 200 Hz
increments).
NOTE
Frequencies which are above the output
frequency range of the RF Section, if
selected, will be stored in the keyboard
register, but the information will not be
transferred to the center frequency regis¬
ter. The center frequency register and
the readout will retain the last valid
input.
Frequencies below the output
frequency range of the RF Section will
be transferred to the center frequency
register and
the output register; the
output frequency will be accurate but
the output amplitude will be degraded.
As an example, the Model 86601A RF
Section has a specified lower frequency
limit of 10 kHz, but typically will pro¬
duce a useable RF output down to
3 kHz or lower.
b.
When frequencies below the RF Section
frequency range are selected, the OUT OF RNG
lamp lights and remains lit.
c.
Select any desired sweep width within
the frequency range of the RF Section in u.se. See
paragraph
3-14
for
further
details
of sweep
operation.
d.
Select any incremental step within the
frequency range of the RF Section in use. See
3-1
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