Performance Check; Preliminary Information; Tektronix Field Service; Using This Procedure - Tektronix 7844 Instruction Manual

This procedure is to be used for the 7844/R7844 as a check of instrument performance. Completion of each step in the
procedure ensures that the instrument is correctly operating within all given tolerances. Refer to the following discussion for
instructions on complete or partial performance checks.
P RELIM INARY INFORM ATION
Performance Check Interval
To maintain instrument accuracy, check the performance
of the 7844/R7844 every 1 000 hours of operation, or every
six months if used infrequently. Thoroughly clean and in­
spect this instrument as outlined in the Maintenance
Section.

Tektronix Field Service

Tektronix, Inc. Field Service Centers and Factory Service
Centers provide instrument repair and readjustment ser­
vices. Contact your Tektronix Field Office or representative
for further information.

Using This Procedure

Completion of this procedure will check the performance
of the standard 7844/R7844 and instruments with options.
When portions of this procedure do not apply to an instru­
ment with an option, a note will appear at the beginning of
the step (e.g. Omit with Option 2 1 ) . The Set-Up Information
will include control settings for the 7844/R7844 standard
model and instruments with options.
Index
To aid in locating procedure steps, an index precedes the
Performance Check Procedure.
Partial Procedures
The following procedure is written to completely check
the 7844/R7844 to the Performance Requirements listed in
Table 4-2. If the applications for which you will use
the7844/R7844 do not require the full available performance
from the 7844/R7844 and plug-in combinations, the proce­
dures and the required equipment list can be shortened ac­
cordingly. For example,
measurement capabilities of this instrument can be verified
by just checking vertical deflection accuracy and basic hori­
zontal timing with 7000-Series real-time plug-in units and
the 7844/R7844 calibrator signal.
REV J U N 1 981
PERFORM A NCE CHECK
the basic low-frequency
Section 4-7844/R7844 Service
A partial performance check may be desirable after re­
placing components, or to check the adjustment of a portion
of the instrument. To check only part of the instrument, refer
to the Equipment Required list preceding the portion to be
performed.

Performance Check Summary

Table 4-2, Performance Check summary, lists the electri­
cal specifications that are checked in this section. Table 4-2
is intended to provide a convenient means for locating the
procedures that check instruments to meet the applicable
electrical specifications.
TEST EQ U IPM ENT REQ U IRED
The test equipment listed in Table 4-1 is required for a
complete performance check of this instrument. Specifica­
tions given in Table 4-1 for test equipment are the minimum
required to meet those specifications (listed in the Specifica­
tion section). Detailed operating instructions for test equip­
ment are omitted in this procedure. Refer to the test
equipment instruction manual if more information is needed.

Special Calibration Fixtures

Special calibration fixtures are used only where they fa­
cilitatE� the instrument performance check. These fixtures
are available from Tektronix, Inc. Order by part number from
Tektronix Field Offices or representatives.

Performance Check Equipment Alternatives

Test equipment listed in the Examples of Applicable Test
Equipment column, Table 4-1 , is required for this Perfor­
mance Check. The Performance Check Procedure is based
on the first item of equipment given as an example. If other
equipment is substituted, control settings or performance
check setups may need to be altered. If the exact item of
equipment given as an example is not available, refer to the
Minimum Specifications column to determine if other equip­
ment may be substituted. Then check the Usage column. If
you determine that your measurement requirements will not
be affected, the item and corresponding step(s) can be
deleted .
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