IMP57
EN - 3
1.2. DURING
USE
Carefully read the following recommendations and instructions:
WARNING
No compliance with the Warnings and/or Instructions may damage the
apparatus and/or its components or injure the operator.
When the instrument is connected to the tested circuit never touch any test lead which
is not being used.
The STATUS LED blinking in red indicates that the instrument is overheating. You will
have to wait until STATUS LED get back to GREEN status before executing new test.
Never execute more than 50 test in one hour.
The red colour (fixed) of STATUS LED indicates a dangerous situation. Disconnect
immediately Test Leads from the Circuit under Test.
1.3. AFTER
USE
Always disconnect alligator clips from the circuit under Test before disconnecting Test
cables from Instrument's inputs.
1.4.
DEFINITION OF MEASURING (OVERVOLTAGE) CATEGORY
The norm EN 61010: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements, defines what a measuring
category, usually called overvoltage category, is.
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.
