Chapter 3 91
Manual Adjustment Procedures
Introduction
NOTE Before performing any adjustments, allow the spectrum analyzer to
warm up for at least 5 minutes.
Safety Considerations
Although this instrument has been designed in accordance with
international safety standards, this manual contains information,
cautions, and warnings which must be followed to ensure safe operation
and to prevent damage to the instrument. Service and adjustments
should be performed only by qualified service personnel.
WARNING Adjustments in this section are performed with power supplied
to the instrument and protective covers removed. There are
voltages at many points in the instrument which can, if
contacted, cause personal injury. Be extremely careful.
Adjustments should be performed only by trained service
personnel.
Power is still applied to this instrument with the
LINE switch in
the off position. Before removing or installing any assembly or
printed circuit board, remove the line-power cord.
Capacitors inside the instrument may still be charged, even if
the instrument has been disconnected from its source of supply.
Use a nonmetallic adjustment tool whenever possible.
Which Adjustments Should Be Performed?
Table 3-1 on page 93 lists the manual adjustments that should be
performed when an assembly is repaired or changed. It is important to
perform the adjustments in the order indicated to ensure that the
instrument meets its specifications.
Test Equipment
The equipment required for the manual adjustment procedures is listed
in Table 1-5, "Recommended Test Equipment." Any equipment that
satisfies the critical specifications given in the table may be substituted
for the preferred test equipment.
If an 3335A is not available for performance tests, tests using alternate
test equipment are available. See Chapter 3a, “Manual Adjustment
Procedures: 3335A Source not Available,” on page 161.
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