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Idiomas disponibles
Idiomas disponibles
1.2 DURING USE
Carefully read the following recommendations and instructions:
Non compliance with warnings and/or instructions may cause damage to
the tester or its components or injure the operator.
• During a current measurement keep the clamp as far as possible from cables not
involved in measurement.
• During a current measurement keep the cable under test in the very middle of the jaws.
1.3 AFTER USE
• If you expect not to use the instrument for a long period of time remove the batteries
and strictly follow the indications at § 9.2.
1.4 MEASUREMENT CATEGORIES - DEFINITIONS
The IEC/EN61010-1 guideline (Safety requirements for electrical equipment for
measurement, control and laboratory use, Part 1: General requirements) defines what a
measurement category (usually called "overvoltage category") is. At § 6.7.4: Measuring
circuits it says:
(OMISSIS)
Circuits are divided into the following measurement categories:
• Measurement category IV is for measurements performed at the source of low
voltage installations
Examples are electricity instruments and measurements on primary overcurrent protection
devices and ripple control units.
• Measurement category III is for measurements performed in the building installation.
Examples are measurements on distribution boards, circuit breakers, wiring, including cables,
bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for
industrial use and some other equipment, for example, stationary motors with permanent
connection to fixed installation.
• Measurement category II is for measurements performed on circuits directly
connected to the low voltage installation
Examples are measurements on household appliances, portable tools and similar equipment.
• Measurement category I is for measurements performed on circuits not directly
connected to MAINS
Examples are measurements on circuits not derived from MAINS, and specially protected
(internal) MAINS-derived circuits. In the latter case, transient stresses are variable; for that
reason, the norm requires that the transient withstand capability of the equipment is made
known to the user.
CAUTION
EN - 3
XL421 - XL422
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