Adjustment Procedure; Introduction; Purpose; Structure - Tektronix 2235A Instruction Manual

Section 5
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2235A Instruction
Adjustment Procedure
INTRODUCTION
PURPOSE
The Adjustment Procedure is a set of logically
sequenced instructions intended to return the instrument
to conformance with the Performance Requirement
statements listed in Table 1-1. Adjustments contained in
this procedure should only be performed after checks
from the Performance Check Procedure (Section 4) have
indicated a need for readjustment or after repairs have
been made to the instrument.
STRUCTURE
This procedure is structured into four major subsections,
each of which can be performed independently to permit
adjustment of individual sections of the instrument. For
example, if only the Vertical section fails to meet the Per-
formance Requirements or has had repairs made, it can
be readjusted with little or no effect on other sections of
the instrument.
The Power Supply section, however, affects all other
sections of the instrument. Therefore, if repairs or
readjustments have been made that change the
absolute value of any of the supply voltages, the entire
Adjustment Procedure should be performed.
At the beginning of each subsection is a list of all the
front-panel control settings required to prepare the
instrument for performing Step 1 in that subsection. Each
succeeding step within a subsection should be per-
formed in sequence and in its entirety to ensure that con-
trol settings will be correct for ensuing steps. All steps
within a subsection should be completed.
TEST EQUIPMENT
The test equipment listed in Table 4-1 is a complete list
of the equipment required to accomplish both the
Performance Check Procedure in section 4 and the
Adjustment Procedure in this section. To assure
accurate measurements, it is important that test equip-
ment used for making these checks meet or exceed the
specifications described in Table 4-1. When con-
sidering use of equipment other than that
recommended, utilize the Minimum Specification
column to determine whether available test equipment
will suffice.
Detailed operating instructions for test equipment are
not given in this procedure. If more operating information
is required, refer to the appropriate test-equipment
instruction manual.
LIMITS AND TOLERANCES
The limits and tolerances stated in this procedure are
instrument specifications only if they are listed in the
Performance Requirements column of Table 1-1.
Tolerances given are applicable only to the instrument
undergoing adjustment and so not include test equip-
ment error. Adjustment of the instrument must be
accomplished at an ambient temperature between
+
20°C and
+
30°C, and the instrument must have had a
warm-up period of at least 20 minutes.
ADJUSTMENT INTERACTION
Some adjustments interact with and affect other adjust-
ment settings. Table 5-1 identifies these interaction
areas. Refer to this table if a partial procedure is
performed or if a circuit requires readjustment due to a
component replacement. To use Table 5-1, first find the
adjustment that was made (extreme left column). Then
move to the right, across the row, until you come to a
darkened square. From the darkened square, move up
the column to find the interactive adjustment. Check the
accuracy and, if necessary, readjust the adjustment.
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