Section 5—485/R485 Service
CALIBRATION
Introduction
To ensure instrument accuracy, check the calibration of
the 485 after every 1000 hours of operation, or every six
months if used infrequently. Before complete calibration,
thoroughly clean and inspect the instrument as outlined in
the Maintenance Section.
TEKTRONIX Field Service
Tektronix, Inc. provides complete instrument repair and
recalibration at local Field Service Centers and the Factory
Service Center. Contact your local TEKTRONIX Field
Office or representative for further information.
Using This Procedure
Part 1 — Performance Check. Performance of this
instrument can be checked without removing the covers or
making internal adjustments. This procedure checks the
instrument against the SPECIFICATION tolerances
(Section 1). Screwdriver adjustments accessible from the
outside of the instrument are adjusted in this procedure.
Part 2 — Calibration Procedure. Completion of each step
in this procedure ensures that this instrument is correctly
adjusted and performing within all listed tolerances.
Partial Calibration. A partial check or adjustment is
often desirable after replacing components, or to touch up
the adjustment of a portion of the instrument between
complete recalibrations. To check or adjust only part of the
instrument, set the controls according to Preliminary
Control Settings, then start with the major section contain
ing the part to be adjusted (horizontal, vertical, or triggers).
To avoid unnecessary recalibration of other parts of the
instrument, readjust only if the tolerance given in the
CHECK — part of the step is not met. If readjusted, also
check the calibration of any other steps listed in the
INTERACTION part of this step.
TEST EQUIPMENT REQUIRED
The following test equipment and accessories, or its
equivalent, is required for complete calibration of the 485.
The equipment specifications given are the minimum
necessary for accurate calibration and may be less than
those of the listed test equipment. The test equipment must
be operating within the listed specifications and correctly
calibrated.
Not all of the listed test equipment is required for the
Performance Check; those items not required for the
Performance Check are indicated by footnote 1.
If equipment substitutes are made, the calibration setup
may have to be altered to fit the requirements of that
equipment. Detailed operating instructions for the test
equipment are not given in this procedure. Refer to the test
equipment instruction manual if further instruction is
needed.
Special Calibration Fixtures
Special TEKTRONIX calibration fixtures are used in this
procedure only where they aid instrument calibration.
These special calibration fixtures are available from
Tektronix, Inc. Order by part number through your local
TEKTRONIX Field Office or representative.
Calibration Equipment Alternatives
All of the test equipment listed is required to completely
check and adjust this instrument. Complete checking or
adjustment, however, may not always be necessary or
desirable. The user may only check selected characteristics,
thereby reducing the amount of test equipment actually
required. For example, the basic measurement capabilities
of this instrument can be verified by checking vertical
deflection accuracy using the two Standard Amplitude
Calibrators; bandwidth and triggering using the two
Constant-Amplitude Signal Generators; and horizontal
timing accuracy using the Time-Mark Generator.
®
5-1
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