Tektronix 7D14, Instruction Manual

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7D14
SECTION S
CALIBRATION
Change information, if any, affecting this section will be found at the rear of this manual.
Recalibration Interval
To assure instrument accuracy, check the calibration of
the 7D14 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 checking or adjusting the 7D14. These are:
Index. To aid in locating a step in the Performance
Check or Adjustment procedure, an index is given pre­
ceding Part I — Performance Check and Part II — Adjust­
ment procedure.
Performance Check. The performance of this instru­
ment can be checked without removing the side shields or
making internal adjustments by performing only Part I —
Performance Check. This procedure checks the instrument
against the tolerances listed in the Performance Require­
ment column of Section 1. In addition, a cross-reference is
provided to the step in Part II — Adjustment, which will
return the instrument to correct calibration. In most cases,
the adjustment step can be performed without changing
control settings or equipment connections.
Adjustment Procedure. To return this instrument to
correct calibration with the minimum number of steps, per­
form only Part II — Adjustment. The Adjustment proce­
dure gives the recommended calibration procedure for all
circuits in this instrument.
Partial Procedure. A partial check or adjustment is often
desirable after replacing components or to touch up the
adjustment of a portion of the instrument between major
recalibrations. To check or adjust only part of the instru­
ment, start with the nearest Equipment Required list pre­
ceding the desired portion. To prevent unnecessary recali­
bration of other parts of the instrument, readjust only if
the tolerance given in the CHECK— part of the step is not
met. If re adjustment is necessary, also check the calibra­
tion of any steps listed in the INTERACTION— part of the
step.
Complete Performance Check /Adjustment. To
completely check and adjust all parts of this instrument,
perform both Parts I and II. Start the complete procedure
by performing the Adjustment procedure for a portion of
the instrument (e.g., Channel A Adjustments) and follow
this with the Performance Check for the same portion (e.g.,
Channel A Checks). This method will assure that the instru­
ment is both correctly adjusted and performing within all
Performance Requirements as given in Section 1.
TEST EQUIPMENT REQUIRED
General
The following test equipment and accessories, or its
equivalent, is required for complete calibration of the
7D14. Specifications given for the test equipment are the
minimum necessary for accurate calibration. Therefore,
some of the specifications listed here may be somewhat less
precise than the actual performance capabilities of the test
equipment. All test equipment is assumed to be correctly
calibrated and operating within the listed specifications.
The Performance Check and Adjustment procedures are
based on this recommended equipment. If other equipment
is substituted, control settings or calibration setup may
need to be altered to meet the requirements of the equip­
ment used. Detailed operating instructions for the test
equipment are not given in this procedure. Refer to the
instruction manual for the test equipment if more infor­
mation is needed.
Calibration Equipment Alternatives
All of the test equipment is required to completely
check and adjust this instrument. However, some of the
items used only for the Performance Check can be deleted
without compromising the instrument's measurement
capabilities. For example, the pulse generator is used only
in the Performance Check and may be deleted if the user
does not desire to check the performance of the External
Gate or External Reset functions. Equipment used only for
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