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SAFETY WARNINGS
The following safety warnings should
be
observed before using Model236/237 /238 Source Measure
Units.
The Model236/237 /238 Source Measure
Unit
is intended for use
by
qualified personnel
who
recognize shock hazards
and
are familiar
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
voltage levels greater
than
30V
RMS
or
42.4V
peak
are present. A
good
safety practice
is
to expect
that
hazardous
volt-
age
is
present
in
any
unknown
circuit
before
measuring.
Inspect 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
or
jumpers. 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 measurements
with
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 fixture to safety earth
ground
using #18 AWG
or
larger wire (supplied accessory).
Instrumentation
and
accessories should
not
be
connected to humans.
The~
symbol
on
a Model 237 indicates that
lOOOV
or
more
may
be
present
on
the terminals. Refer to the Model
236/237/238 Operator's Manuals for detailed operation information.
WARNING
With
remote
sensing
enabled,
an
open
sense
lead
will
result
in
lethal
voltages
appearing
at
OUTPUT
HI
and
GUARD.
This
voltage can cause
injury
or
death,
and
damage
external circuitry. Always
make
sure
that
the
sense
leads are
properly
connected before
enabling
remote sense. NEVER change connections
with
power
applied. Be sure
to always discharge
and/or
disconnect external
power
sources.
For multiple unit interlocked test systems, either keep all Model236/237 /238s
powered
on,
or
turn
them
all off.
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