i
Safety Summary
The
f
ollowing
safety
pr
ecautions
apply
to
bo
th
operating
a
n
d m
aintenance
pe
rsonnel
a
n
d m
ust
be
followe
d
during
a
ll
p
hases
o
f
o
peration,
s
ervice,
a
n
d
repair
of
this
i
nstrument.
Before
a
pplying
power
t
o
t
his
i
nstrument:
•
Rea
d a
n
d
understand
t
he
s
afety
and
operational
informatio
n in
this
manual.
•
Apply
all t
he
lis
ted
s
afety
p
recautions.
•
Verify
tha
t
the
v
oltage
s
elector
at
the
l
ine
power
c
or
d i
nput
i
s
s
e
t t
o
the
c
orrec
t l
ine
voltage.
O
perating
the
in
strument
at an in
correct
line
v
oltage
w
ill
v
oid
t
he
warranty.
•
Make
a
ll
c
onnections
to
the
i
nstrument
be
fore
a
pplying
po
wer.
•
Do
not
o
perate
the
i
nstrumen
t in w
ays
not s
pecifie
d
by
t
his
m
anual
o
r
by
B&K
P
recision.
Failure
to
c
omply
w
ith
these
p
recautions
or w
ith
warnings
e
lsewhere
i
n
this
man
u
al v
iolates
the
safety
s
tandards
of
design,
m
anufacture,
a
nd
i
ntende
d us
e
of
the
i
nstrument.
B
&K
P
recision
assumes
n
o
lia
bility
for
a c
ustomer’s
f
ailure
t
o
c
omply
w
ith
t
hese
requirements.
Category rating
The
I
EC
6
1010
s
tandard
defines
s
afety
c
ategory
r
atings
tha
t s
pecify
t
he
a
moun
t of e
lectrical
energy
a
vailable
a
nd
the
voltage
im
pulses
t
hat
ma
y
o
ccu
r o
n
e
lectric
al c
onductors
associated
wi
th t
hese
c
ategory
r
atings.
T
he
c
ategory
r
ating
i
s
a R
oma
n n
umeral
of I
,
I
I,
I
II,
o
r
I
V.
This
r
ating
is
als
o
ac
companied
by
a ma
ximu
m v
oltage
o
f
t
he
c
ircuit
t
o
b
e
tested,
w
hic
h de
fines
t
he
v
oltage
impulses
e
xpecte
d and
required
i
nsulatio
n c
learances.
T
hese
c
ategories
a
re:
Category
I (
CAT
I
):
M
easurement
i
nstruments
who
se
m
easureme
nt i
nputs
are
no
t i
ntended
to
be
c
onnecte
d
to
t
he
m
ains
s
upply.
T
he
v
oltages
in t
he
environment
a
re
t
ypically
d
erived
fro
m a
limited-energy
transformer
or a b
attery.
Category
I
I
(
CAT
I
I)
: M
easurement
i
nstruments
w
hos
e m
easurement
i
nputs
a
re
m
eant
to
be
connected
to
the
mai
ns
s
upply
a
t
a s
tandard
wall
outlet
o
r
similar s
ources.
E
xample
measurement
e
nvironments
a
re
po
rtable
tools
and
househol
d a
ppliances.
Category
I
II
(
CAT
I
II)
: M
easurement
i
nstruments
whos
e m
easurement
i
nputs
a
r
e
meant
to
b
e
connected
to
the
mai
ns
i
nstallation
o
f
a b
uilding.
Examples
ar
e
me
asurements
i
nside
a
building's
c
ircuit
b
reake
r
panel
or
the
w
iring
o
f
p
ermanently-installed
mo
tors.
Category
I
V
(
CAT
I
V)
: M
easurement
i
nstruments
whos
e m
easurement
i
nputs
a
r
e
meant
to
b
e
connecte
d
to
the
primary
po
wer
entering
a
building
o
r
o
ther
o
utdoor
w
iring.
Do
not
us
e
t
his
i
nstrumen
t in an e
lectrical
e
nvironmen
t w
it
h a
higher
c
ategory
r
ating
tha
n w
ha
t
www.
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