HT PVCHECK, Руководство пользователя

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PVCHECK 4
1.2. DURING USE
Please carefully read the following recommendations and instructions:
CAUTION

Failure to comply with the caution notes and/or instructions may damage the
instrument and/or its components or be a source of danger for the operator.

The symbol “ ” indicates a full charge level of the internal batteries. When
battery charge decreases
to a minimum level, the symbol “ ” appears on the
display. In this case, stop testing and replace the batteries according to the
indications given in § 9.2

The instrument is capable of keeping data stored even without batteries.
1.3. AFTER USE
When measurements are completed, turn off the instrument by pressing and holding the ON/OFF
key for some seconds. If the instrument is not to be used for a long time, remove the batteries and
follow the instructions given in § 3.4
1.4. DEFINITION OF MEASUREMENT (OVERVOLTAGE) CATEGORY
Standard “IEC/EN61010-1: Safety requirements for electrical equipment for measurement, control
and laboratory use, Part 1: General requirements” defines what measurement category, commonly
called overvoltage category, is. § 6.7.4: Measured circuits, reads:
Circuits are divided into the following measurement categories:

Measurement category IV is for measurements performed at the source of the low voltage
installation

Examples are electricity meters and measurements on primary overcurrent protection devices
and ripple control units.

Measurement category III is for measurements performed on installations inside buildings

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 standard requires that the transient withstand capability of the equipment is made
known to the user.