DVM903
V. 02
–
29/01/2020
7
©Velleman nv
The existing categories according EN 61010-1 are:
CAT
I
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…
CAT
II
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 10 m apart from a
CAT III- or 20 m apart from a CAT IV-environment. E.g. household
appliances, portable tools…
CAT
III
A CAT III-rated meter is suitable for measurements in CAT I- and
CAT II-environments, as well as for measurements on (fixed) mono-
or poly-phased appliances which are at least 10 m apart from of a
CAT IV-environment, and for measurements in or on distribution
level equipment (fuse boxes, lighting circuits, electric ovens).
CAT
IV
A CAT IV-rated meter is suitable for measuring in CAT I-, CAT II-
and CAT III-environments 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.
Warning:
This device was designed in accordance with EN 61010-1 installation
category CAT II 700 V and CAT IV 600 V. This implies that certain
restrictions in use apply that are related to voltages and voltage peaks
which can occur within the environment of use. Refer to the table above.
This device is only suitable for measurements
up to 700 V
in
CAT II
and
up to 600 V
in
CAT IV
8.
Pollution Degree
IEC 61010-1 specifies different types of pollution environments, for which
different protective measures are necessary to ensure safety. Harsher
environments require more protection, and the protection against the
pollution which is to be found in a certain environment depends mainly on
the insulation and the enclosure properties. The pollution degree rating of
the DVM indicates in which environment the device may be used.
Pollution
degree 1
No pollution or only dry, nonconductive pollution occurs. The
pollution has no influence. (only to be found in hermetically
sealed enclosures)
