Manual de uso Velleman DVM630 Multímetro

Manual de uso

DVM630

V. 01 – 22/04/2013 6 ©Velleman Inc.

Before changing functions or measuring range, disconnect the test leads

from the circuit under test.

For all DC functions, to avoid the risk of shock due to possible improper

readings, verify the presence of any AC voltages first by using the

AC function. Then select a DC voltage range equal to or greater than

the AC range.

Use 2 x 1.5 V AAA type batteries, properly installed in the meter‟s

battery case, to power the meter.

Replace the battery as soon as the battery indicator appears. With

a low battery, the meter may produce false readings that can lead to

electric shock and personal injury.

Do not operate the meter with the case (or part of the case) removed.

Always verify that all connections are reliable and safe.

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 33 ft (10 m) apart

from a CAT III, or 66 ft (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 33 ft (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.

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