43
• When changing the range, first disconnect
the test leads from the circuit under test in
order to avoid any accident
• When the instrument is connected to measur-
ing circuits never touch any unused terminal
• When measuring resistors do not add any
voltage. Although there is a protection cir-
cuit, excessive voltage could cause malfunc-
tioning
• If during measurement the displayed values
remain constant check whether the HOLD
• function is active
• After using the instrument turn it off
• If you expect not to use the instrument for
a long period remove the battery to avoid
leakages of battery liquids which may dam-
age its inner components
•
Measurement category IV
is for
measurements performed at the source of
the lowvoltage installation
Examples are electricity meters and meas-
urements on primary overcurrent protection
devices and ripple control units
•
Measurement category III
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 meas-
urements 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
The IEC/EN61010-1: Safety requirements for electrical equipment for measurement, control and
laboratory use, Part 1: General requirements, gives a definition of measuring category, usually called
overvoltage category. chapter 6.7.4: Measuring circuits:
Circuits are divided into the following measurement categories:
1.2. During use
1.3. After use
1.4. Measuring (overvoltage) categories definitions
Read the recommendations which follow and the instructions in this manual:
CAUTION
An improper use may damage the instrument and/or its components or injure
the operator.
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