Adjustment Procedure; Introduction; Purpose; Test Equipment Required - Tektronix 2246 1Y Service Manual

ADJUSTMENT PROCEDURE

IM P O R TA N T -P LE A S E READ BEFORE USING THIS PROCEDURE

PURPOSE

This Adjustment Procedure returns the instrument to
conformance with the Performance Requirements as
listed in the Specification Tables in Section 1. Adjust­
ments should be done only after the checks in the
Performance Check Procedure (Section 4) have indi­
cated a need for a readjustment of the instrument.

TEST EQUIPMENT REQUIRED

The test equipment listed in Table 4-1 (section 4) is
all the equipment required to complete the Adjust­
ment Procedure in this section and the Performance
Check Procedure in Section 4. Test equipment speci­
fications described in Table 4-1 are the minimum
necessary to provide accurate results; you must use
Equipment that meets or exceeds these specifica­
tions. Detailed operating instructions for test equip­
ment are not given in this procedure; if more operat­
ing information is required, refer to the appropriate
test equipment instruction manual.
When equipment other than that recommended is
used, control settings of the test setup may need to
be altered. If the exact item of equipment given as an
example in Table 4-1 is not available, first check the
Use column to verify use of this item. Then use the
Minimum Specification column to determine whether
other available test equipment might work.

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 the Table 1-1,
Electrical Characteristics. Tolerances given are appli­
cable only to the instrument under adjustment and do
not include test equipment error. Adjustments must
be made at an ambient temperature between +20°C
REV OCT 1991
S ection 5 - 2 2 4 6 1Y and 2 2 4 6 M O D A Service

INTRODUCTION

and +30°C, and the instrument must have had a
warm -up period of at least 20 minutes.
This procedure is divided in subsections to permit
adjustment of individual sections of the instrument
(except the Power Supply) whenever a complete
readjustment is not required. For example, if only the
Vertical section fails to meet the Performance
Requirements (or has had repairs made or com­
ponents replaced), it can be readjusted with little or
no effect on other sections of the instrument.
However, if the Power Supply section has undergone
repairs or adjustments that change the absolute value
of any of the supply voltages, a complete readjust­
ment of the instrument is required.
At the beginning of each subsection is a list of the
initial front-panel control settings required to prepare
the instrument for Step 1 in that subsection. Each
succeeding step within a subsection should then be
done completely and in the sequence presented to
ensure that control settings will be correct for steps
that follow.
INTERNAL ADJUSTMENTS AND
Do not preset any internal controls, since that may
make it necessary to recheck or readjust a major
portion of the instrument when only a partial check or
adjustment might otherwise have been required. To
avoid unnecessary
change an internal control setting only when a
Performance Characteristic cannot be met with the
original setting. When independently changing the
setting of any internal control, always check Table
5-1 for possible interacting adjustments that might be
required.

PARTIAL PROCEDURES

ADJUSTMENT INTERACTION
recheck and readjustment,
5 -1