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Velleman DVM852 Manual

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DVM851
V. 03 – 23/10/2015 7 ©Velleman nv
"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.
"VmA" 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:
CAT
1
A CAT 1-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
2
A CAT 2-rated meter is suitable for measurements in CAT 1-
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 3- or 20m apart from a CAT 4-environment.
E.g. household appliances, portable tools…
CAT
3
A CAT 3-rated meter is suitable for measurements in CAT 1-
and CAT 2-environments, as well as for measurements on
(fixed) mono- or poly-phased appliances which are at least 10m
apart from of a CAT 4-environment, and for measurements in
or on distribution level equipment (fuse boxes, lighting circuits,
electric ovens).
CAT
4
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.
Note that for all measurements on equipment for which the
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
… 7 …


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