Section
4-2225
Service
PERFORMANCE CHECK PROCEDURE
INTRODUCTION
PURPOSE
The Performance Check Procedure is used to verify
the instrument's Performance Requirements state-
ments 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 accuracy, check its perfor-
mance after every 2000 hours of operation, or once
each year if used infrequently. A more frequent
interval may be necessary if the instrument is
subjected to harsh environments or severe usage.
The Performance Check Procedure 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
ltem
number that follows each piece of equipment
corresponds to the
ltem 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 EQUlPlVlENT REQUIRED
The test equipment listed in Table 4-1 is a complete
list of the equipment required to accomplish both
the Performance Check Procedure in this section
and the Adjustment Procedure in Section
5.
Test
equipment specifications described in Table 4-1 are
the minimum necessary to provide accurate results.
Therefore, equipment used must meet or exceed
the listed specifications. Detailed operating instruc-
tions for test equipment are not given in this
procedure. If more operating 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, 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
I
valid for an instrument that is operating in and has
been previously calibrated in an ambient
temperature between
+20°C and +30°C. The
i
instrument 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. All tolerances specified are
for the instrument only and do not include test-
equipment error.
PREPARATION FOR CHECKS
I
It is not necessary to remove the instrument cover
to accomplish any subsection in the "Performance
Check Procedure," since all checks are made using
operator-accessible front- and rear-panel controls
and connectors.
The most accurate display adjustments 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.
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