Velleman EVM892 - Manual (Page 5)

EVM892
29.04.2010 ©Velleman nv 5
When measuring currents up to 10A, max. 10s continuous
measurement followed by a 15 minutes break between 2
measurements.
When carrying out measurements on a TV set or switching power
circuits, always be aware that high amplitude voltage pulses at the
test points might damage the meter.
Do not replace internal parts yourself. Replace damaged or lost
accessories by identical ones with the same specifications. Order
spare accessories e.g. test probes at your dealer.
Switch off the meter and remove test probes prior to replacing the
battery or fuses.
All modifications of the device are forbidden for safety reasons.
Damage caused by user modifications to the device is not covered
by the warranty.
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 which 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 which 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 III- or 20m 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 10m 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 600V. 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 600V on:
• Protected electronic circuits which are not directly connected to mains power,
e.g. electronics circuits, control signals, circuits behind isolating transformer…
• circuits which are directly connected to mains power, but limited to: