HT instruments GEO416 - Manual (Page 4)

GEO416 - GEO416GS
EN - 3
1.2. DURING USE
You are recommended to read carefully the following instructions:
CAUTION
Failure to comply with warnings and instructions may damage the instrument
and/or its components as well as injure the operator. If the low battery symbol
is displayed during use interrupt testing and replace batteries following the
procedure described in § 8.2
 Before selecting a new function disconnect the test leads from the circuit under test
 When the instrument is connected to the circuit under test never touch any unused
terminal
 Do not measure resistance in the presence of external voltages; although the
instrument is protected, an excessive voltage may cause malfunction
 Avoid submitting the instrument to voltage while measuring (i.e. a test lead slipping off
the measuring point accidentally touching an energized point).
1.3. AFTER USE
 Turn off the instrument pressing ON/OFF key after using it
 If you expect not to use the instrument for a long time remove the batteries.
1.4. DEFINITION OF MEASUREMENT CATEGORY (OVERVOLTAGE)
The standards IEC/EN61010-1: Safety requirements for electrical equipment for
measurement, control and laboratory use, Part 1: General requirements, define what a
measurement category, usually called over voltage category, means. Under § 6.7.4:
Measuring circuits, it quotes:
Circuits are divided into the following measurement categories:
 Measurement category IV is for measurements performed at the source of a low-
voltage installation.
Examples are electricity meters and measurements on primary excess current
protection devices as well as ripple control units.
 Measurement category III is for measurements performed in the building installations.
Examples are measurements on distribution boards, circuit breakers, wiring, including
cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installations, and
equipment for industrial use as well as some other equipment, for example, stationary
motors with permanent connection to fixed installations.
 Measurement category II is for measurements performed on circuits directly
connected to the low voltage installations.
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
(internally) protected MAINS-derived circuits. In this latter case, transient stresses are
variable; for this reason, the norm requires that the transient withstanding capability of
the equipment is made known to the user.