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Safety
Precautions
The
following
safety
precautions should
be observed before using
this
product and any
associated instrumentation.
Although
some
in-
struments
and
accessories
would
normally be used with non-haz-
ardous
voltages, there are situations
where
hazardous
conditions
may
be
present
This product
is
intended
for
use
by
qualified
personnel
who
recog-
nize
shock
hazards
and
are familiar
with
the safety
precautions
re-
quired
to
avoid
possible
injury.
Read
the
operating information
carefully before using the
product
The
types
of
product
users
are:
Responsible
body
is
the individual
or
group
responsible for the
use
and maintenance
of equipment,
for
ensuring
that
the
equipment
is
operated
within
its
specifications
and
operating
limits,
and
for en-
suring
that
operators are
adequately
trained.
Operators
use
the
product
for
its
intended
function.
They
must
be
trained
in electrical
safety
procedures
and proper
use
of
the
instru-
ment.
They
must
be
protected
from
electric
shock and
contact with
hazardous
live circuits.
Maintenance
personnel perform
routine
procedures
on
the
product
to
keep
it
operating, for
example,
setting
the
line
voltage or
replac-
ing
consumable
materials.
Maintenance procedures
are
described
in
the
manual.
The
procedures
explicitly state
if
the
operator
may
per-
form
them. Otherwise,
they
should
be performed only
by
service
personnel.
Service personnel
are trained to
work on
live circuits,
and perform
safe
installations
and
repairs
of
products.
Only
properly
trained
ser-
vice
personnel
may
perform
installation
and
service
procedures.
Exercise extreme
caution
when
a
shock hazard
is
present.
Lethal
voltage
may
be
present
on
cable
connector Jacks or
test fixtures.
The
American
National Standards
Institute
(ANSI)
states that
a shock
hazard
exists
when
voltage
levels
greater
than
30V RMS,
42.4V
peak, or
60VDC
are present.
A
good
safety practice
is
to
expect
that
hazardous
voltage
is
present
in
any
unknown
circuit
before
measuring.
Users of
this
product
must be
protected
from
electric
shock
at
all
times.
The
responsible
body must
ensure
that
users are
prevented
access and/or insulated
from
every connection
point.
In
some
cases,
connections
must be
exposed
to
potential
human
contact.
Product
users in these
circumstances
must
be
trained
to
protect
themselves
from
the risk
of
electric
shock.
If the circuit
is
enable
of
operating
at
or
above
1000
volts,
no
conductive part of
the
circuit
may
be
exposed.
As
described
in
the
International Electrotechnical
Commission
(lEC) Standard
lEC
664,
digital
multimeter measuring
circuits
(e.g,,
Keithley
Models
175
A,
199,
2000, 2001, 2002,
and 2010)
are
Installation
Category
II.
All other instruments'
signal
terminals are
histallation
Category
I
and must
not
be connected
to
mains.
Do
not
connect switching
cards
directly to
unlimited
power
circuits.
They
are
intended
to
be used
with
impedance
limited sources.
NEVER
connect switching
cards
directly to
AC
mains.
When
con-
necting sources
to
switching
cards,
install
protective
devices
to
lim-
it
fault
current
and
voltage
to
the
card.
Before operating an
instruraent,
make
sure the
line
cord
is
connect-
ed
to
a properly
grounded
power
receptacle.
Inspect
the
connecting
cables,
test
leads,
and jumpers
for
possible wear, cracks, or
breaks
before
each
use.
For
maximum
safety,
do
not
touch
the
product,
test
cables,
or
any
other instruments
while
power
is
applied
to
the
circuit
under
test.
ALWAYS
remove
power
from
the
entire test
system
and
discharge
any
capacitors before:
connecting
or
disconnecting cables or
jump-
ers,
installing
or
removing
switching
cards,
or
making
internal
changes,
such
as installing
or
removing
jumpers.
Do
not
touch any
object
that
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 withstanding
the voltage
being
measured.
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