Keithley 237 Service Manual

SECTION
1
. .
Performance
Verification
1 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 stffl 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
Model
236/237.
Refer
to
the
Model 236/237
Opera
tor‘s
Manual for complete
information.
1
.2
ENVIRONMENTAL
CONDITIONS
All
measurements
should
be
made
at
18-28°C
(6582°F)
and
at
less than
70% humidity.
1
3
INITIAL CONDITIONS
WARNING
The
Source Measure
Unit is equippedwith a
3wire
power cord that
contains a
separate
grotmd 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
Model
236/237 must
be
turned on and
aliowed
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
1.2),
additional
tinte 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.
1.4
RECOMMENDED TEST EQUIPMENT
Table
1-1 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 1-2.
Note
that
equipment
characterization
(paragraph
1.5.1)
is not
re
quired
ifusing
equipment
that
meets
the specifications in
Table 1-2.
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,
caiculate
new
limits based
both
on instrument accuracy
specifications
and
test
equipment
accuracy
specifica
tions,
then repeat
the
test.
14

Keithley 237 Specifications

General

Brand	Keithley
Model	237
Category	Measuring Instruments
Language	English