Introduction; Purpose; Performance Check Interval; Structure - Tektronix 2205 Service Manual

PERFORMANCE CHECK PROCEDURE

PURPOSE

The Performance Check Procedure is used to
verify the instrument's Performance Requirements
statements listed in Table 1-1 and to determine the
need for calibration. The performance checks may
also be used as an acceptance test or as a
preliminary troubleshooting aid.

PERFORMANCE CHECK INTERVAL

To ensure instrument
performance after every 2000 hours of operation, or
once each year if used infrequently. A more fre­
quent interval may be necessary if the instrument is
subjected to harsh environments or severe usage.

STRUCTURE

The Performance Check Procedure1 is structured
in subsections to permit checking individual sections
of the instrument whenever a complete Performance
Check is not required. At the beginning of each sub­
section there is an equipment-required list showing
only the test equipment; necessary for performing
the steps in that subsection, in this list, the Item
number that follows each piece of equipment
corresponds to the Item number listed in Table 4-1.
Also 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 particular
subsection should then be performed, both in the
sequence presented and in its entirety, to ensure
that control-setting changes will be correct for
ensuing steps.

TEST EQUIPMENT REQUIRED

The test equipment listed in Table 4-1 is a com­
plete list of the equipment required to accomplish
both the Performance Check Procedure in this

INTRODUCTION

accuracy, check its
section and the Adjustment Procedure in Section 5.
Test equipment specifications
Table 4-1 are the minimum necessary to provide
accurate results. Therefore, equipment used must
meet or exceed the listed specifications. Detailed
operating instructions for test equipment are not
given in this procedure. If more operating infor­
mation 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, check
the Minimum Specification column to determine if
any other available test equipment might suffice to
perform the check or adjustment.

LIMITS AND TOLERANCES

The limits and tolerances given in this procedure
are valid for ah instrument that is operating in and
has been previously calibrated in an ambient
temperature between +20°C and +30°C. The instru­
ment also must have had at least a 20-minute
warm-up period. Refer to Table 1-1 for tolerances
applicable to an instrument that is operating outside
this temperature range. Ail tolerances specified are
for the instrument only and do not include test-
equipment error.

PREPARATION FOR CHECKS

It is not necessary to remove the instrument
cover to accomplish
Performance Check Procedure, since al! checks are
made using operator-accessible fro n t- and rear-
panel controls and connectors.
The most accurate display checks are made with
a stable, well-focused, low-intensity display. Unless
otherwise noted, adjust the INTENSITY, FOCUS, and
Trigger LEVEL controls as needed to view the
display.
Section 4—2205 Service
described in
any subsection in the
4-1