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Info
ormation
n sheet
Safety
y inforrmation for Digital
D
Volt M
Meters
(
(DVMs
)
1. 2. 3. 4. Symbols
s used on DVMs an
nd in man
nuals Overvolttage/insta
allation ca
ategories Pollution
n degree General mbols us
sed on DVMs and
a
in manual
m
s
1. Sym
ndicates: Read
R
instr
ructions
This symbol in
r
the
e instruction
ns and man
nual can lea
ad to dama
age, injury or
o
Not reading
death
h.
This symbol in
ndicates: Danger
D
A haz
zardous
condition or acttion that ma
ay result in
n injury or death
d
ndicates: Risk
R
of dan
nger/dam
mage
This symbol in
dous condittion or actio
on that may
y result in damage, in
njury
Risk of a hazard
eath
or de
This symbol in
ndicates: A
Attention; importan
nt informattion
Ignoring this infformation can
c
lead to hazardous
s situations.
AC (A
Alternating Current)
DC (Direct Currrent)
Both AC and DC
C
ble insulatio
on (class II-protection
n)
Doub
h
Earth
Fuse
Capa
acitor
e
Diode
Continuity
Vellema
an®
1/3
La
ast update: 31/0
03/2010
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…
Velleman®
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).
2/3
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.
Last update: 31/03/2010
Info
ormation
n sheet
3. Polllution degree
d
IEC 61010-1 spe
ecifies different types of pollution
n environments, for w
which differe
ent
ctive measu
ures are ne
ecessary to ensure saffety. Harsher environm
ments requ
uire
protec
more protection,, and the protection against the pollution which
w
is to b
be found in a
certain environm
ment depends mainly on
o the insulation and the enclosu
ure propertties.
gree rating of the DVM
M indicates
s in which environmen
e
nt the devic
ce may
The pollution deg
ed.
be use
Pollution degree 1 No pollu
ution or onlly dry, nonconductive pollution o
occurs. The
pollution has no in
nfluence. (o
only to be fo
ound in herrmetically sealed
s
enclosures)
Pollution degree 2 Only no
onconductiv
ve pollution occurs. Oc
ccasionally,, temporary
y
conducttivity cause
ed by conde
ensation is to be expe
ected.(home
e and
office environmentts fall unde
er this categ
gory)
Pollution degree 3 Conductive pollutio
on occurs, or dry nonc
conductive pollution occurs
o
comes cond
ductive due
e to conden
nsation thatt is to be
that bec
expecte
ed.
(industrrial environ
nments and environme
ents expose
ed to outsid
de air
- but no
ot in contac
ct with prec
cipitation)
Pollution degree 4 The pollution gene
erates persiistent conductivity cau
used by
door
conducttive dust orr by rain orr snow. (exposed outd
environments and environme
ents where high humid
dity levels or
o
ns of fine pa
articles occ
cur)
high concentration
4. Gen
neral
W
Warnin
g - Ca
aution
n
•
•
•
•
•
•
•
•
•
•
Disconnect the
D
t
test lea
ads from the test pointts before ch
hanging the
e position of
o the
fu
unction (rottary) switch
h.
D
Disconnect
t
the
test lea
ads from the test pointts and remove the tes
st leads from the
m
measuring
terminals be
efore replac
cing the ba
atteries/fuse
es, or servicing the DV
VM.
W
WARNING:
To avoid electrical
e
sh
hock alway
ys disconne
ect the testt leads priorr to
opening the housing. To
T prevent damage
d
or injury, only use batte
eries and fu
uses
w
with
the sam
me ratings as
a specified
d in this ma
anual.
Never conne
ect a voltag
ge source with
w
the fun
nction (rotary) switch in Ω /
/
/
µA /
mA /
A / Hz / Hffe or °C/°F position.
C
Caution:
ris
sk of electro
oshock whe
en measurin
ng voltages > 36VDC, 25VAC, currrents
> 10mA, AC
C power line
es with indu
uctive loads and AC power lines w
with fluctuatting
po
ower.
A
Avoid
body contact witth ground potential
p
(e..g. metallic terminals, output soc
ckets,
le
ead clamp…
…) while mea
asuring. Ma
ake sure to be electrica
ally insulate
ed from gro
ound
during meas
surement.
A
Always
use the device within its specified
s
range.
O
Only
use the
e included test
t
leads. When
W
dama
aged, replace them wiith test lead
ds of
th
he same typ
pe and with
h the same specificatio
ons.
Calibration and
a
repair must
m
be perrformed by a qualified technician.. Refer to your
y
ocal dealer.
lo
D not expo
Do
ose the DVM
M to extrem
me tempera
ature or hum
midity levels.
Vellema
an®
3/3
La
ast update: 31/0
03/2010