Keithley 237

+
APPENDIX F
236/237 Performance Verification
F.1
INTRODUCTION
The
procedures outlined
in
this section
may
be
used
to
verify
that
the
instrument
is
operating
within
the
limits
stated
in
the
specifications
at
the
front
of
this manual.
Performance verification
may
be
performed
when
the
in-
strument
is
first received
to
ensure
that
no
damage
or
misadjustment
has
occurred
during
shipment. Verifica-
tion
may
also
be
performed
whenever
there
is
question
of
instrument
accuracy,
or
following calibration,
if
desired.
NOTE
If
the
instrument
is
still
under
warranty
(less
than
1
year
from the
date
of
shipment),
and
its
performance falls outside
the
specified range,
contact
your
Keithley representative
or
the
factory
to
determine the correct course
of
ac-
tion.
Before attempting
any
of
the following procedures,
make
sure
you
are
familiar
with
the controls
and
operation of
the
Model236/237. Refer
to
the
Model236/237
Opera-
tor's
Manual
for complete information.
F.2
ENVIRONMENTAL CONDITIONS
All measurements
should
be
made
at
18-28°C (65-82°F)
and
at
less
than
70%
humidity.
F.3
INITIAL CONDITIONS
WARNING
The
Source
Measure
Unit
is
equipped
with
a
3-wire
power
cord
that
contains
a
separate
+
ground
wire
and
is
designed
to
be
used
with
grounded
outlets.
When
proper
connections
are
made,
instrument
chassis
is
connected
to
power
line
ground.
Failure
to
use
a
grounded
outlet
may
result
in
injury
or
death
due
to
electric shock.
The
Model236/237
must
be
turned
on
and
allowed to
warm
up
for
at
least
one
hour
before beginning the verifi-
cation procedures.
If
the
instrument
has
been
subject to
extremes
of
temperature
(outside
the
range
specified
in
paragraph
F.2), additional time
should
be
allowed for in-
ternal temperatures
to
reach
normal
operating tempera-
ture. Typically,
it
takes
one
additional
hour
to
stabilize a
unit
that
is
10°C (18°F) outside
the
specified temperature
range.
F.4
RECOMMENDED
TEST EQUIPMENT
Table
F-1
summarizes
recommended
equipment
for the
verification procedures. Alternate
equipment
may
be
used
as
long
as
the
substitute
equipment
has
specifica-
tions
at
least
as
good
as
those listed
in
Table F-2.
Note
that
equipment
characterization (paragraph F.5.1)
is
notre-
quired
if
using
equipment
that
meets
the
specifications
in
Table F-1.
The
accuracy limits stated
in
the
verification procedures
are
based
only
on
Model236/237
specifications,
and
they
do
not
include test
equipment
tolerance.
If
a particular
measurement
falls slightly outside the allowed range,
calculate
new
limits
based
both
on
instrument
accuracy
specifications
and
test
equipment
accuracy specifica-
tions,
then
repeat
the
test.
F-1