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Model
1920
Maintenance
3-13.
CALIBRATION
3-14.
This
section
contains
information
necessary
to
calibrate
the
Model
1920
in
your
instrument
(191
or
lY2).
Calibration
should
be performed
when any
of
the
followiny
conditions
occur:
A.
Annually
B.
Installation
of
the
1920
C.
Performance
Verification
indicates
1920
as out
of
specification
3-15.
RECOMMENDED TEST EQUIPMENT
3-16.
Recommended
test
equipment
for
calibration
is
listed
in
the
following
table.
Alternate
equipment
may be used.
However,
the
accuracy
of the
alternate
equipment
must
be
at
least
4 times
better
than
the
Model
1920 specifications,
or equal
to
the
specifications
listed
in
the
Table
below.
TABLE 3-3
Recommended
Test
Equipment
For
Calibration
ITEM
UESCRIPTION
SPECIFICATION
MFK.
MOUEL
-
A
DC Calibrator
+1v
Fluke
343A
r.uw'/
B
AC Calibrator
U.lV,
lV,
lOV,
1uuv
H-P
745A
Hl.U22%
C
High
Voltage
Amplifier
IUOUV
H-P
746A
(Used
with
Model
74SA)
+0.04x
II
Calibration
Cover
--
Keithley
1913
(191)
3-17.
ENVIRONMENTAL CONDITIONS
3-18.
Calibration
should
be performed
under
laboratory
conditions
having
an ambient
temperature
of
23
_+l"C,
and a relative
humidity
of
less
than
70%.
If
the
instrument
has
been
subjected
to
temperatures
outside
of this
range,
or the
higher
humidity,
allow
two
hours
minimum
for
the
instrument
to
stabilize
at the
specified
environmental
conditions
before
beginning
the
calibration
procedure.
3-19.
CALIBRATION
PROCEDURE
3-20.
Remove the
top
cover
of your
instrument
and replace
it
with
the
appropriate
calibration
cover.
With
the
calibration
cover
in
place
allow
the
internal
temperature
of
the
instrument
to
stabilize
for
two
hours
before
performing
the
calibration.
3-7
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