Velleman DVM831 - Manual (Page 6)

31.03.2010
to voltages and
Refer to the ta
This device is
• Protected el
e.g. electron
• circuits whic
• measurem
mains by
• mono-ph
normal d
apart from
househol
a distribu
This device is
• Voltages abo
• measureme
behind mete
• measureme
CAT III or C
circuits, bus
• Measuremen
meter boxes
environmen
or circuits u
This
env
5. Pollution
IEC 61010-1 sp
different protec
environments r
which is to be f
and the enclos
which environm
Pollution
degree 1 No
pol
enc
Pollution
degree 2 On
con
offi
Pollution
degree 3 Con
tha
(in
but
Pollution
degree 4 The
dus
env
fine
d voltage peaks which
ble above.
s suitable for measu
ectronic circuits which
nics circuits, control s
ch are directly connec
ments on mono-phase
y means of a plug
ase appliances and ci
omestic environment,
m a CAT III- or 20m a
d appliances, portable
ution board …
s NOT suitable for:
ove 500V
nts in/on low-voltage
er box)
nts on (fixed) mono-
CAT IV environments (
s bars, low-voltage dis
nts on distribution equ
s and equipment/circu
t e.g. circuits in sheds
sing underground wir
s device is only suitab
vironments.
n degree
pecifies different type
ctive measures are ne
require more protectio
found in a certain env
ure properties. The po
ment the device may b
pollution or only dry,
llution has no influenc
closures).
ly nonconductive pollu
nductivity caused by c
ice environments fall
nductive pollution occ
at becomes conductive
dustrial environments
t not in contact with p
e pollution generates
st or by rain or snow.
vironments where hig
e particles occur)
DVM831
6
h can occur within the
urements up to 500V
h are not directly conn
ignals, circuits behind
ted to mains power, b
e appliances which are
rcuits directly connect
, provided that the cir
apart from a CAT IV-e
e tools, light circuits a
distribution boards (d
or poly-phased applia
(e.g. mains outlets, el
stribution boards and
uipment and outdoor
uits outside or remote
s, garden houses and
ing e.g. garden lightin
ble for measurements
es of pollution environ
ecessary to ensure saf
on, and the protection
vironment depends ma
ollution degree rating
be used.
nonconductive pollut
ce (only to be found in
ution occurs. Occasion
condensation is to be
under this category).
curs, or dry nonconduc
e due to condensation
s and environments ex
precipitation).
persistent conductivit
(exposed outdoor en
h humidity levels or h
©Velleman nv
environment of use.
V on:
nected to mains powe
d isolating transformer
but limited to:
e connected to the
ted to the mains in a
rcuit is at least 10m
environment. E.g.
at more than 10m from
distribution boards
ances and circuits in
ectric ovens, lighting
circuit breakers).
installations including
e from the domestic
free-standing garage
ng, pool-pump...
up to 500V in CAT I
ments, for which
fety. Harsher
n against the pollution
ainly on the insulation
of the DVM indicates
tion occurs. The
n hermetically sealed
nally, temporary
expected (home and
ctive pollution occurs
n that is to be expecte
xposed to outside air
ty caused by conductiv
vironments and
high concentrations of
v
er,
r…
m
g
es,
II
n
n
in
ed
-
ve
f