Tektronix 2215A, Instruction Manual

Page: 46 / 206

Section 4— 2215A Service
PERFORMANCE CHECK PROCEDURE
INTRODUCTION
PURPOSE
The “Performance Check Procedure" is used to verify the
Performance Requirement statements listed in Table 1-1. It
is the recommended acceptance check procedure for new
instruments.
Instrument performance should be checked after every
2000 hours of operation or once each year, if used infre­
quently. A more frequent interval may be necessary, if your
instrument is subjected to harsh environments or severe us­
age. The results of these periodic checks will determine the
need for readjustment.
Selected procedures may also be used as preliminary
troubleshooting aids or to verify instrument performance af­
ter repair or component replacement.
STRUCTURE
This procedure is structured into four major subsections,
each of which can be performed independently, to permit
checking individual portions of the instrument. At the begin­
ning of each subsection 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 instru­
ment for performing Step 1 in that subsection. Each suc­
ceeding step within a particular subsection should then be
performed, both in the sequence presented and in its en­
tirety, to ensure that control-setting changes will be correct
for ensuing steps.
TEST EQUIPMENT
The test equipment listed in Table 4-1 is a complete list of
the equipment required to accomplish both the “Perfor­
mance Check Procedure" in this section and the ‘ Adjust­
ment Procedure" in Section 5. To assure accurate
measurments, it is important that test equipment used for
making these checks meet or exceed the specifications de­
scribed in Table 4-1. When considering use of equipment
other than that recommended, utilize the “Minimum Speci­
fication" column to determine whether available test equip­
ment will suffice.
Each procedure in this section is written using the control
and connector nomenclature imprinted on the “recom­
mended" test equipment. When substitute equipment is
used, control settings stated in the test setup and in the
procedure itself may need to be altered.
Detailed operating instructions for test equipment are not
given in this procedure. If more operating information is re­
quired, refer to the appropriate test-equipment instruction
manual.
LIMITS AND TOLERANCES
The tolerances given in this procedure are valid for an
instrument that is operating in and has been previously cali­
brated in an ambient temperature between + 20°C and
+ 30°C. The 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 in­
strument only and do not include test-equipment error.
4-1