Type
453/R453
SECTION 5
PERFORMANCE
CHECK
I CALIBRATION
Change
information,
if
any,
affecting
this section
will
be
found
at
the
rear
of
the
manual.
Introduction
To assure instrument
accuracy,
check the calibration of
the Type 453 every 1000 hours
of
operation,
or
every six
months
if
used infrequently. Before
complete
calibration,
thoroughly
clean
and
inspect this instrument
as
outlined
in
the
Maintenance
section.
As
an
aid
to
the
calibration
of
the instrument, a Short-
Form Procedure
is
given prior
to
the
complete
procedure.
To
facilitate instrument calibration for the
experienced
cali-
brator,
the Short-Form Procedure lists the calibration adjust-
ments necessary for
each
step
and
the
applicable
tolerances.
This
procedure
also
includes the
step
number
and
title
as
listed
in
the
complete
Performance
Check/Calibration
Pro-
cedure
and
the
page
number
on
which
each
step
begins.
Therefore, the Short-Form Procedure
can
be
used
as
an
index
to
locate
a
step
in
the complete procedure. Another
feature
of
the
Short-Form Procedure
is
the
spaces
provided
to
record
performance
data
or
to
check off steps
as
they
are
com-
pleted. This
procedure
can
be
reproduced
and
used
as
a
permanent
record
of
instrument calibration.
.,..,,,.,
The
complete
Performance
Check/Calibration
Procedure
can
be
used
to
check instrument
performance
without remov-
ing the covers
or
making internal adjustments by performing
all portions
except
the
ADJUST-
part
of a step. Screwdriver
adjustments which
are
accessible without removing the cov-
ers
are
adjusted
as
part
of the performance check proce-
dure. A note titled PERFORMANCE
CHECK
ONLY gives
instructions which
are
applicable
only
to
the performance
check
procedure
and
if
necessary, lists the next
applicable
step
for the performance check procedure.
Completion
of
each
step
in
the
complete
Performance
Check/Calibration
Procedure insures
that
this instrument
meets the electrical specifications given
in
Section 1.
Where
possible, instrument performance
is
checked
before
an
adjust-
ment
is
made.
For
best
overall instrument performance when
performing a complete calibration procedure, make
each
adjustment to the
exact
setting even
if
the
CHECK-
is
within
the
allowable
tolerance.
©
NOTE
All
waveforms
shown
in this
procedure
were
tak-
en
with
a
Tektronix
Oscilloscope
Camera
System.
Limits,
tolerances
and
waveforms
in this
procedure
are
given
as
calibration
guides
and
should
not
be
intepreted
as
instrument
specifications
except
as
specified
in
Section
1.
A partial
calibration
is
often
desirable
after
replacing
components,
or
to
touch up the
adjustment
of
a portion
of
the instrument
between
major
recalibrations. To check
or
adjust
only
part
of
the instrument,
set
the controls
as
given
under
Preliminary Control Settings
and
start
with the
nearest
test
equipment
picture
preceding
the desired portion. If
any
controls
need
to
be
changed
from the preliminary settings
for this portion
of
the calibration procedure, they
are
listed
under
the
heading
Partial Procedure following the
equipment
required picture. To prevent unnecessary recalibration
of
other
parts
of
the instrument, readjust only
if
the
tolerance
given
in
the
CHECK-
part
of this
step
is
not met. If
read-
justment
is
necessary,
also
check the calibration of
any
steps
listed
in
the
INTERACTION-part
of
the step.
TEST
EQUIPMENT
REQUIRED
General
The following test equipment,
or
its equivalent,
is
required
for
complete
calibration
of
the Type 453. Specifications giv-
en
are
the minimum necessary for
accurate
calibration
of
this
instrument.
All
test
equipment
is
assumed
to
be
correctly
calibrated
and
operating
within the given specifications.
If
equipment
is
substituted, it must
meet
or
exceed
the speci-
fications of the recommended equipment.
Special Tektronix calibration fixtures
are
used
in
this pro-
cedure
only
where
they facilitate calibration. These special
calibration fixtures
are
available
from Tektronix,
Inc.
Order
by
part
number through your local Tektronix Field Office
or
representative.
1.
Variable
autotransformer.
1
Must
be
capable
of
supply-
ing 200 volt-amperes
over
a
range
of
90
to
137 volts (180
to
274 volts for 230-volt nominal line).
(If
autotransformer
does
not
have
an
AC voltmeter
to
indicate
output
voltage,
moni-
tor
the
output
with
an
AC voltmeter with a
range
of
at
least 137
or
274 volts,
RMS.)
For
example,
General
Radio
Wl
OMT3W
Metered
Variac Autotransformer (note
that
the
full
current
capabilities
of
this unit
are
not required).
2. Precision
DC
voltmeter.
1
Accuracy, within
+0.05%;
meter resolution, 50 microvolts;
range,
zero
to two kilovolts.
For
example,
Fluke Model 825A Differential
DC
Voltmeter
(use Fluke Model 80E-2
Voltage
divider
to
measure
voltages
above
500 volts).
1
Not
required
for
performance
check only.
5-1
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