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HT9019
EN - 3
1.2. DURING USE
Always keep to the instructions contained in this manual.
CAUTION
Non compliance with the CAUTIONs and/or the instructions may damage
the tester and/or its components or injure the operator.
Before changing the switch position, take off the clamp jaw from the tested conductor
or the electrical circuit in order to avoid any accident
When the clamp is connected to the circuits to be tested, never touch unused terminals
When testing resistors, do not add voltage. Although there is a protection circuit,
excessive voltage would cause malfunctioning
Before measuring current, remove the voltage-resistance test leads
When measuring current, any strong current close to the clamp jaw will affect the
accuracy
When measuring current, always put the tested conductor in the middle of the clamp
jaw in order to obtain a more accurate reading
If the reading value or the sign indication remains unchanged during the measurement,
check if the HOLD function is active
1.3. AFTER USE
Once the measurements are completed, turn the rotary switch to OFF.
If you expect not to use the clamp for a long time, remove the battery.
1.4. MEASURING (OVERVOLTAGE) CATEGORIES DEFINITIONS
The norm EN 61010-1: 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 § 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.
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