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Always be careful when working with voltages above 60 VDC or 30 VAC
rms. Keep your fingers behind the probe barriers at all times during
measurement.
Never perform resistance, diode or continuity measurements on live
circuits. Make sure all capacitors in the circuit are depleted.
6. 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 I-rated meter is suitable for measurements on protected
CAT I
electronic circuits that are not directly connected to mains power,
e.g. electronics circuits, control signals...
A CAT II-rated meter is suitable for measurements in CAT I-
environments and mono-phase appliances that are connected to the
CAT
mains by means of a plug and circuits in a normal domestic
II
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...
A CAT III-rated meter is suitable for measurements in CAT I- and
CAT II-environments, as well as for measurements on (fixed) mono-
CAT
or poly-phased appliances which are at least 10 m apart from of a
III
CAT IV-environment, and for measurements in or on distribution
level equipment (fuse boxes, lighting circuits, electric ovens).
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.
CAT
Note that for all measurements on equipment for which the supply
IV
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 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 600 V in
CAT III
V. 02 – 20/08/2018
DCM268N
6
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