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Maintenance
Model
1920
3-4.
PERFORMANCE VERIFICATION
3-5.
Performance
verification
may be performed
upon
receipt
of
the
instrument
to
ensure
that
no damaye
or misadjustment
has
occurred
duriny
transit.
NOTE
For
instruments
that
are
still
under
warranty
(less
than
12 months
since
date
of
shipment),
if
the
instrument's
performance
falls
outside
specifications
at
any point,
contact
your
Keithley
representative
or
the
factory
immediately.
3-6.
RECOMMENDED TEST EQUIPMENT
3-7.
Kecommended
test
equipment
for
performance
verification
is
listed
in Table
3-l.
Alternate
test
equipment
may be used.
However,
if
the
accuracy
of
the
alternate
test
equipment
is
not
at
least
4 times
better
than
the
instrument
specifications,
additional
allowance
must
be made in
the
readinys
obtained.
ITEM
TABLE 3-l
Recommended
Test
Equipment
For
Performance
Verification
UESCKIPTIUN
SPECIFICATION
MFK,
I
O.lV,
lV,
lOV, 1oov
H-P
+O.WzX
1OOOV
H-P
+0.04%
AC Calibrator
High
Voltage
Amplifier
(Used
with
Model
745A)
UC Calibrator
I
1v +0.002x
Flukl
746A
343A
3-7.
ENVIRONMENTAL CONDITIONS
3-8.
All
measurements
should
be made at
an ambient
temperature
within
the
range
of
18"
to
28'C
(GS" to
82'F),
and a relative
humidity
of
less
than
8o'k.
3-9.
PERFORMANCE VERIFICATION
PROCEDURE
3-10.
Use the
following
procedure
to
verify
the
basic
accuracy
for
AC voltage
in
the
Model
191
or
the
Model
192.
3-4
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