Model 8904A Adjustments
Section
5
ADJUSTMENTS
5-1.
INTRODUCTION
This section contains adjustments and checks that assure peak performance
of
the Multifunction
Synthesizer. The instrument should be readjusted after repair
or
failure to pass a performance test.
Allow a 10 minute warm-up prior to performing the adjustments. Removing the top and bottom covers
is the only disassembly required for most adjustments on a standard instrument. An instrument with
two
outputs, Option
002,
will require removing the A10 Output Assembly if the A3 Output Assembly
requires adjustment. (The disassembly procedure
is
shown in Figure
5-4.)
NOTE
The
instrument
has
been fully tested and calibrated prior to shipment. It
is
preferable
that
m
adjustments be made to
the
instrument unless
it
has
failed
during performance testing (see Section
4).
To determine which performance
tests
and adjustments to perform after a repair, refer to paragraph
5-
4,
Post-Repair Tests, Adjustments, and Checks.
5-2.
SAFETY CONSIDERATIONS
This section contains information, cautions, and warnings which must be followed for your protection
and to avoid damage to the equipment.
This instrument contains components
that
are highly susceptible to damage
from static discharge. Always observe proper
ESD
safety procedures while
making any measurements
or
touching any part of
the
inside of the
instrument.
Most adjustments described
in
this section are performed with power supplied
to
the
instrument and with protective covers removed. Maintenance should
be performed only
by
service trained personnel who are aware of the hazard
involved (for example, fire and electrical shock). Where maintenance can be
performed without power applied,
the
power should be removed.
Removal of
the
Multifunction Synthesizer’s top and bottom covers
is
necessary
to perform these adjustments.
The
exposed power supply contains circuitry
operating at a potential of
~160
Vac. Be very careful to not rest your
hands,
tools,
or
anything else against any part of the power supply.
Immediately below
the
top of
the
rear frame rail are
the
line-power socket,
fuse holder, and line-voltage-select switch. If the instrument
must
be moved
while being adjusted, be careful
not
to let your fingers touch
the
terminals on
any
of
these parts while moving.
5-1
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