Keithley 236 Service Manual

SAFETY
PRECAUTIONS
The following
safety
precautions should
be
observed before
using Model
236/237
Source Measure
Units
The Model
236/237
Source
Measure Unit is
intended for use
by
qualified
personnel who recognize
shock hazards
and
are famifiar with
the
safety precautions
required
to
avoid possible
injury. Read over the
Operator‘s manual carefully
before
using
the
instrument.
Exercise
extreme
caution
when
a shock
hazard is present. Lethal
voltages may
be
present
on the test fixture
or the
Source
Measure
Unit
connector
jacks. The
American National Standards
Institute (ANSI)
states that a shock hazard
exists when
voltagelevels
greater
than
30V
RMS
or4Z4V peak arc present.
A good safety practice
is to expect thathazardous
voltage
is present in
any
unknown circuit
before measuring.
lnspect the connecting
cables,
test leads, and jumpers
for possible
wear,
cracks, or breaks before
each use.
For
maximum
safety,
do not
touch
the Source
Measure
Unit,
test
fixture,
test cables or any other
instruments while
power
is applied
to
the
circuit under
test. Turn off all
power and discharge any
capacitors before
connecting or
discon
necting
cables
orjumpers. Also,
keep
the
test fixture lid
closed while
power
is applied
to
the device
under test. Safe
op
eration
requires
the
use of the
lid interlock.
Do
not
touch any
object which could
provide
a
current path
to
the common
side of the circuit
under
test
or
power
line
(earth)
ground.
Always make
measurementswith
dry hands while
standing
on
a dry, insulated
surface
capable
of with
standing
the
voltage being
measured,
Do
not
exceed the maximum
signal
levels of
the test fixture,
as
shown
on
the rear panel
and
as
defined in the
specifica
tions
and
operation
section
of the
instruction
manual.
Connect
the
screw
of
the
test
fixftire
to safety earth
ground using
#18 AWG
or larger
wire
(supplied
accesso).
Instrumentation
and
accessories
should not
be
connected
to
humans.
The
symbolon
a
Model237
indicates
that
1000V or
more may
be present on the
terminals. Refer
to the
Mode1236/237
Operator‘s
Manuals
for detailed
operation
information.
When
a
Model
236/237
is
programmed
for
remote sensing,
hazardous
voltage
may
be present on
the
SENSE and
OUT
PUT
terminals when
the
unit is in
operate
regardiess of
the
programmed
voltage or
current.
To
avoid a possible
shock
hazard,
always turn offall
power
before
connecting or
disconnecting
cables to the Source
Measure Unit
or the
associated
test
fixture.

Keithley 236 Specifications

General

Voltage Source Range	±100V
Current Source Range	±100 mA
Voltage Measure Range	±100V
Current Measure Range	±100 mA
Voltage Range	±100V
Current Range	±100 mA
Type	Source Measure Unit (SMU)
Compliance Limit	Programmable
Interface	IEEE-488
Resolution	5.5 digits
Operating Modes	Voltage source, Current source, Voltage measure, Current measure