Overvoltage/Installation Category - Velleman DVM851 Manual Del Usuario

"10A" jack

Insert the red test lead in this connector in order to measure a
max. current of 10A.
"COM" jack

Insert the black (negative) test lead.
"VmA" jack

Insert the red (positive) test lead in this connector to measure
voltage, resistance and current (except 10A).

Overvoltage/Installation Category

DMMs are categorized depending on the risk and severity of transient
overvoltage that might occur at the point of test. Transients are short-
lived bursts of energy induced in a system, e.g. caused by lightning
strike on a power line.
The existing categories according EN 61010-1 are:
A CAT 1-rated meter is suitable for measurements on protected
CAT
electronic circuits that are not directly connected to mains
1
power, e.g. electronics circuits, control signals...
A CAT 2-rated meter is suitable for measurements in CAT 1-
environments and mono-phase appliances that are connected
CAT to the mains by means of a plug and circuits in a normal
2 domestic environment, provided that the circuit is at least 10m
apart from a CAT 3- or 20m apart from a CAT 4-environment.
E.g. household appliances, portable tools...
A CAT 3-rated meter is suitable for measurements in CAT 1-
and CAT 2-environments, as well as for measurements on
CAT (fixed) mono- or poly-phased appliances which are at least 10m
3 apart from of a CAT 4-environment, and for measurements in
or on distribution level equipment (fuse boxes, lighting circuits,
electric ovens).
A CAT 4-rated meter is suitable for measuring in CAT 1-, CAT 2-
and CAT 3-environments as well as on the primary supply level.
CAT
Note that for all measurements on equipment for which the
4
supply cables run outdoors (either overhead or underground) a
CAT 4 meter must be used.
Warning:
This device was designed in accordance with EN 61010-1 installation
category CAT 2 600V. This implies that certain restrictions in use apply
V. 03 – 23/10/2015
DVM851
7 ©Velleman nv