Tektronix 7623, Instruction Manual

Page: 13 / 266

Section 2—7623/R7623 Service
CALIBRATION
Calibration Interval
To assure instrument accuracy, check the calibration of
the 7623 every 1000 hours of operation, or every six
months if used infrequently. Before complete calibration,
thoroughly clean and inspect this 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
General.
This section provides several features to facili­
tate calibration of the 7623. These are:
Index.
An index is given preceding the calibration
procedure to aid in locating a step.
Performance Check. The performance of this instrument
can be checked by performing only the VCHECK steps.
The V preceding a step indicates that performing this step
checks the instrument against the tolerance listed as a
Performance Requirement (see Specification Section in the
Operators Manual).
Partial Procedure. A partial calibration is often desirable
after replacing components, or to touch up the adjustment
of a portion of the instrument between major recalibra­
tions. To calibrate only part of the instrument, set the
controls as given under Preliminary Control Settings and
start with the nearest Equipment Required list preceding
the desired portion. To prevent unnecessary recalibration of
other parts of the instrument, re-adjust only if the tolerance
given in the CHECK- part of the step is not met. If
re-adjustment is necessary, also check the calibration of any
steps listed in the INTERACTION— part of the step.
Complete Calibration Procedure. Completion of each
step in the following calibration procedure ensures that this
instrument is both correctly adjusted and performing
within all given tolerances.
TEST EQUIPMENT REQUIRED
The test equipment and accessories, or the equivalent,
given in the Test Equipment table is required for complete
calibration of the 7623. Specifications given for the test
equipment are the minimum necessary for accurate calibra­
tion. Therefore, the specifications of any test equipment
used must meet or exceed the listed specifications. All test
equipment is assumed to be correctly calibrated and
operating within the listed specification. Detailed operating
instructions for the test equipment are not given in this
procedure. Refer to the instruction manuals for the test
equipment for more information.
Special Calibration Fixtures
Special Tektronix calibration fixtures are used in this
procedure only where they facilitate 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 listed test equipment is required to completely
check and adjust this instrument. This calibration pro­
cedure is based on the first item of equipment given as an
example of applicable equipment. When other equipment is
substituted, control settings or calibration setup may need
to be altered slightly to meet the requirements of the
substitute equipment. If the exact item of test equipment
given as an example in the Test Equipment table is not
available, first check the Specifications column carefully to
see if any other equipment is available which might suffice.
Then check the Usage column to see what this item of test
equipment is used for. If used for a check or adjustment
which is of little or no importance to your measurement
requirements, the item and corresponding step(s) can be
deleted.
The following procedure is written to completely check
and adjust the 7623 to the limits given in Section 2 of the
Operators Manual and to allow interchanging 7000-series
plug-in units between 7000-series mainframes without the
need to recalibrate the instruments each time. If applica­
tions for which you will use the 7623 do not require the
full available performance from the 7623 and plug-in units,
this procedure and the required equipment list can be
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