Instrumen
t c
overs
must
not
be r
emove
d
by
o
perating
personnel.
C
omponent
r
eplacemen
t a
nd
internal
a
djustments
mus
t b
e
m
ade
by
qualifie
d s
ervice-traine
d m
aintenance
pe
rsonnel
w
ho
are
a
ware
of t
he
hazards
involve
d w
he
n
the
i
nstrument's
c
overs
a
n
d s
hields
a
re
removed
.
Under
c
ertai
n c
onditions,
e
ve
n w
it
h t
he
p
ower
c
or
d
removed,
da
ngerous
v
oltages
may
e
xis
t
whe
n
the
c
overs
a
re
removed.
To
a
void
i
njuries,
a
lways
di
sconnec
t
the
power
c
or
d fr
om
t
he
instrument,
disconnec
t a
ll
o
ther
c
onnections
(
for
example,
t
es
t l
eads,
c
ompute
r i
nterface
cables,
e
tc.),
d
ischarge
all c
ircuits,
an
d
v
erify
t
here
ar
e
n
o
h
azardous
v
oltages
p
resent
o
n
an
y
conductors
by
m
easurements
w
i
th
a
pr
operly-operating
v
oltage-sensing
de
vice
be
fore
touching
any
in
terna
l p
arts.
V
erify
the
v
oltage-sensing
device
is w
orking
properly
b
efore
a
nd
a
fte
r mak
ing
the
m
easurements
by
te
sting
wi
th
kno
wn-operating
v
oltage
s
ources
and
t
es
t
for
bo
th
DC
and
AC
voltages.
D
o
n
ot
a
ttempt
an
y
s
ervice
o
r a
djustment
unless
an
othe
r
person
c
apable
o
f
r
endering
firs
t a
i
d a
nd
r
esuscitatio
n i
s
pr
esent.
Do
not
i
nser
t a
ny
o
bject
i
nto
an
instrument's
v
entilation
o
penings
o
r
o
ther
openings.
Hazardous
v
oltages
m
ay
be
present
i
n
une
xpecte
d l
ocations
in c
ircuitry
b
eing
t
este
d w
he
n a
faul
t c
onditio
n in
the
c
ircui
t e
xists.
Fuse replacement
Fuse
r
eplacemen
t m
us
t
be
done
by
q
ualified
s
ervice-trained
main
tenance
personne
l w
ho
ar
e
aware
o
f
t
he
i
nstrument's
fus
e
r
equirements
a
n
d
safe
replacemen
t pr
ocedures.
Disconnec
t
the
instrumen
t
from
the
p
ower
l
ine
before
r
eplacing
fus
es.
R
eplace
fuses
only
w
i
th n
ew
fuses
of
t
he
fuse
types,
v
oltage
r
atings,
a
nd
c
urren
t r
atings
s
pecifie
d in
this
m
anual
o
r
on t
he
back
o
f
t
he
instrument.
F
ailure
to
d
o
s
o
ma
y
damage
the
in
strument,
le
ad
to
a s
afety
h
azard,
o
r
c
ause
a f
ire.
Failure
to
us
e
t
he
s
pecifie
d
fuses
w
ill v
oid
the
w
arranty.
Servicing
Do
not
s
ubstitute
pa
rts
tha
t a
re
not a
pproved
by
B&K
P
recision
o
r
modify
this
i
nstrument.
Retur
n
the
i
nstrumen
t t
o
B
&K
P
recisio
n
for
s
ervice
a
n
d r
epair
t
o
e
nsure
tha
t s
afety
a
n
d
performance
features
a
re
main
tained.
Cooling fans
This
i
nstrumen
t c
ontains
one
or
m
ore
c
ooling
f
ans.
F
or
c
ontinue
d s
afe
operation
o
f
t
he
instrument,
the
a
ir
i
nlet
a
nd e
xhaust
o
penings
f
or
th
ese
fans
m
ust
n
o
t
be
blocke
d
nor
m
us
t
accumulated
d
ust
or
othe
r
debris
b
e
allo
wed
to
reduce
air f
low.
Maintain
a
t
least
2
5
mm
clearance
a
roun
d
the
s
ides
o
f
t
he
i
nstrumen
t
that
c
ontai
n a
ir
i
nle
t a
nd
e
xhaus
t
ports.
I
f
mounted
in a r
ack,
p
osition
powe
r
devices
in t
he
rack
ab
ove
t
he
i
nstrument
to
minimize
instrumen
t
heating
w
hile
r
ack
m
ounted.
D
o
not
c
ontinue
to
o
perate
the
i
nstrume
nt if y
o
u
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