HT instruments MACROTEST 5035 - Manual (Page 5)

MACROTEST 5035
EN - 4
1.2. DURING USE
Carefully read the following recommendations and instructions:
CAUTION
• No compliance with the Warnings and/or Instructions may damage the
apparatus and/or its components or injure the operator
• Before selecting any function disconnect the test leads from the circuit
under test
• When the instrument is connected to the tested circuit never touch any
test lead which is not being used
• Avoid to effect resistance measurements in the presence of external
voltages; even though the instrument is protected a too high voltage may
cause malfunctions
• If the symbol
is displayed during use interrupt testing and replace
batteries following the procedure described under paragraph
Errore.
L'origine riferimento non è stata trovata.. The instrument is capable of
keeping the data stored even though batteries are not installed
1.3. AFTER
USE
• When the measurements are completed disconnect the test leads from the circuit
under test and after that switch OFF the instrument
• Remove batteries when the apparatus remains unused for long periods
1.4. MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS
The norm IEC/EN61010-1: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements, defines what measuring
category, usually called overvoltage category, is. On paragraph 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 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, the norm requires that the transient withstand capability of the
equipment is made known to the user.