Velleman DVM893 Mode D'emploi page 6

• Avoid body contact with ground potential (e.g. metallic terminals, output
sockets, lead clamp...) while measuring. Make sure to be electrically insulated
from ground during measurement.
4. 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 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 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 III 600V / CAT II 1000V. 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 suitable for measurements up to 1000 V:
• Protected electronic circuits that are not directly connected to mains power, e.g.
electronics circuits, control signals, circuits behind isolating transformer...
• circuits that are directly connected to mains power, but limited to:
o measurements on mono-phase appliances that are connected to the mains
by means of a plug
o mono-phase appliances and circuits directly connected to the mains 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, light circuits at more than 10 m from a
distribution board...
This device is suitable for measurements up to 600 V:
• measurements in/on low-voltage distribution boards (distribution boards behind
meter box)
V. 03 – 01/02/2013
DVM893
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