• Failure to comply with the warnings and/or instructions may result in
damage to the equipment and/or its components or personal injury to the
operator
• Do not touch any unused test terminal
• Do not disconnect the cords during measurement
• Do not open the battery compartment when the instrument inputs are
connected
• The symbol “ ” indicates that the internal batteries are fully charged. When
the charge level drops to the minimum level, the symbol “ ” appears on the
display. In this case, stop the tests and replace or recharge the batteries as
described in § 9.2
• The instrument will not charge the batteries if the temperature is
outside the permitted range of them (0°C ÷ 40 °C / 32°F ÷ 104°F)
• The instrument retains data even without batteries
1.3. AFTER USE
When measurements are complete, switch 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 period,
remove the batteries and follow the instructions in § 3.3.
1.4. DEFINITION OF MEASUREMENT CATEGORY (OVERVOLTAGE)
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. In § 6.7.4: Measuring circuits, it states
that:
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 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 (OMITTED) the user must know the transient withstand
capability of the equipment
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