Tektronix 2221 - APPENDIX A: PERFORMANCE CHECK PROCEDURE; TEST EQUIPMENT REQUIRED, LIMITS AND TOLERANCES, PREPARATION FOR CHECKS

Appendix
A -
2221
Operators
APPENDIX
A
PERFORMANCE
CHECK
PROCEDURE
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INTRODUCTION
PURPOSE
The
Performance
Check
Procedure is
used to
verify
"
Performance
Requirements "
listed in
Table 1-2
and to
determine
the
need
for
readjustment .
The
performance
checks
may
also
be
used as
an
acceptance
test or
as a
preliminary
troubleshooting aid .
the
minimum
necessary to
provide accurate
results
.
There
fore ,
equipment used
must meet or
exceed the
listed
specifications .
Detailed
operating
instructions for test
equipment are
not
given in this
procedure . If
more
operat
ing
information is
required ,
refer
to
the
appropriate
test
equipment instruction manual .
PERFORMANCE
CHECK
INTERVAL
When
equipment
other
than
that
recommended
is
used
,
control
settings of the
test
setup may
need to be
changed
.
If
the
exact
item of
equipment
given as an
example in
Table
A - 1
is
not
available
,
check
the
" Minimum
Specification "
column to
determine
if
any other
available
test
equipment can be
used to
perform
the check
.
}
To
ensure
instrument
accuracy ,
check its
performance
after
every
2000
hours of
operation ( or
once
each
year if
used
infrequently
) . A
more
frequent
interval
may be
neces
sary if the
instrument is
subjected to harsh
environments
or
severe
usage
.
LIMITS
AND
TOLERANCES
STRUCTURE
This
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
subsection there is
an
equipment
-
required list
showing
only the
test equip
ment
necessary for
performing
the
steps in that
subsec
tion
.
In
this list ,
the
Item
number
that
follows
each
piece of
equipment
corresponds to the
Item
number listed in
Table A - 1 .
The
tolerances
given
in
this
procedure are
valid for
an
instrument
that
is
operating in
and
has
been
previously
calibrated 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 1-2 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
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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 the
steps that
follow .
It is not
necessary
to
remove the
instrument cover to
complete any of the subsections in the Performance
Check
Procedure ,
since all
checks
are
made
using
operator
-
accessible
front- and rear -
panel
controls
and
connectors
.
TEST
EQUIPMENT
REQUIRED
The
most
accurate
display
adjustments are
made
with
a
stable , well -
focused
,
low -
intensity
display .
Unless
other
wise
noted ,
adjust the
INTENSITY
,
STORE
/
READOUT
INTENSITY ,
FOCUS
,
and
TRIGGER
LEVEL
controls as
needed
to
view
the
display
.
Table A - 1
is
a
complete
list
of
the
test
equipment
required
to
accomplish the
Performance
Check Procedure .
Test
equipment
specifications
described in
Table A - 1 are
o
A -
1