Page 1
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rmatio
sheet
1.
2.
3.
4.
Safet
Symbol
Overvol
Pollutio
General
1. Sy
This
Not
deat
This
A ha
cond
This
Risk
or d
This
Igno
AC (
DC (
Both
info
used on
age/inst
degree
bols u
symbol i
eading th
.
symbol i
ardous
ition or ac
symbol i
of a hazar
ath
symbol i
ring this in
lternating
Direct Cur
AC and D
matio
DVMs a
llation c
ed on
dicates:
instructio
dicates:
ion that m
dicates:
ous condi
dicates:
ormation
Current)
ent)
n for
DVMs
d in ma
tegories
DVMs
ead inst
s and ma
anger
y result i
isk of da
ion or acti
ttention;
an lead to
igital
)
uals
nd in
uctions
ual can le
injury or
ger/da
n that ma
importa
hazardou
Volt
anual
d to dam
eath
age
result in
t informa
situations
eters
s
ge, injury
damage, i
ion
.
r
jury
le insulati
Dou
Eart
Fuse
Cap
Diod
Cont
citor
inuity
n (class II
-protectio
)
Vellem
n®
1/3
L
st update: 31/
3/2010
Page 2
Information sheet
2. Overvoltage/installation categories
DVMs are categorized depending on the risk and severity of transient overvoltage that
might occur at the point of test. Transients are short-lived burst of energy induced in
a system, e.g. caused by lightning strike on a power line.
On high-energy circuits this leads to hazardous situations as these circuits might
provide enough current to feed an arc-over resulting in a plasma breakdown or even
explosion.
Higher CAT-identification refers to electrical environments with higher power and
possibly higher energy transients.
A CAT I-rated meter
is suitable for
measurements on
protected electronic
circuits that are not
directly connected to
mains power, e.g.
electronics circuits,
control signals…
A CAT II-rated meter
is suitable for
measurements in
CAT I-environments
and mono-phase
appliances that are
connected to the
mains by means of a
plug and circuits in a
normal domestic
environment,
provided that the
circuit is at least
10m apart from a
CAT III- or 20m
apart from a CAT IVenvironment. E.g.
household
appliances, portable
tools…
A CAT III-rated
meter is suitable for
measurements in
CAT I- and CAT IIenvironments, as
well as for
measurements on
(fixed) mono- or
poly-phased
appliances which are
at least 10m apart
from of a CAT IVenvironment, and for
measurements in or
on distribution level
equipment (fuse
boxes, lighting
circuits, electric
ovens).
A CAT IV-rated
meter is suitable for
measuring in CAT I-,
CAT II- and CAT IIIenvironments as well
as on the primary
supply level.
Note that for all
measurements on
equipment for which
the supply cables
run outdoors (either
overhead or
underground) a CAT
IV meter must be
used.
Velleman® 2/3 Last update: 31/03/2010
Page 3
Inf
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IEC 6
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more
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The p
be us
Pollut
Pollut
Pollut
Pollut
3. Pol
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tive meas
protection
n environ
ollution de
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ion degree
ion degree
ion degree
ution
cifies diffe
res are n
and the p
ent depen
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pollutio
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2 Only n
conduc
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3 Conduc
that be
expect
(indust
- but n
4 The pol
conduc
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high co
egree
rent types
cessary to
rotection a
ds mainly
of the DV
tion or on
n has no i
res)
nconducti
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nvironmen
tive polluti
omes con
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ial enviro
t in conta
lution gen
ive dust o
ments and
ncentratio
of pollutio
ensure sa
gainst the
n the insu
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e pollutio
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s fall und
n occurs,
uctive du
ments and
t with pre
rates pers
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environm
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environm
ety. Harsh
pollution
lation and
in which
conductive
nly to be f
occurs. O
nsation is
r this cate
or dry non
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ipitation)
stent cond
snow. (ex
nts where
rticles oc
ents, for
er environ
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the enclos
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pollution
und in he
casionally
to be exp
ory)
onductive
sation tha
nts expos
uctivity ca
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hich differ
ents req
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re proper
t the devi
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metically
temporar
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pollution
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4. Ge
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ARNING:
pening the
ith the sa
N
ever conn
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µA /
aution: ri
10mA, A
p
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void body
l
ad clamp
d
uring mea
lways use
nly use th
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C
alibration
cal dealer.
l
o not exp
eral
he test le
ary) switc
he test le
erminals b
To avoid
housing.
e ratings
ct a volta
mA /
k of electr
power lin
contact wi
) while me
urement.
the device
included
e and wit
nd repair
se the DV
arnin
ds from th
.
ds from th
fore repla
lectrical s
o prevent
s specifie
e source
A / Hz / H
shock wh
s with ind
h ground
suring. M
within its
est leads.
the same
ust be pe
to extre
g - C
e test poin
e test poin
ing the b
ock alwa
amage or
in this m
ith the fu
e or °C/°F
n measuri
ctive loads
otential (e
ke sure to
pecified ra
hen dam
specificati
formed by
e temper
utio
s before c
s and rem
tteries/fus
s disconn
injury, onl
nual.
ction (rota
position.
g voltages
and AC po
g. metallic
be electric
nge.
ged, repla
ns.
a qualified
ture or hu
anging th
ove the te
s, or serv
ct the tes
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> 36VDC,
wer lines
terminals,
lly insulat
ce them w
technician
idity leve
position
t leads fro
icing the D
leads prio
ries and f
in Ω /
25VAC, cu
ith fluctua
output so
d from gr
th test lea
Refer to
ls.
f the
m the
M.
to
ses
/
rents
ing
kets,
und
s of
our
Vellem
n®
3/3
L
st update: 31/
3/2010
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