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1. Applications
The METRAOHM 413 is a digital displaying
measuring instrument for the detection of low
impedance from 10 mΩ up to 2000 kΩ.
The METRAOHM 413 may only be used for power
systems with an operating voltage of maximum
400 V.
You can quickly and reliably inspect extensive
protective conductor connections, grounding in-
stallations and equipotential bonding conductors as
well as screening equipment and lightning arresters
with the METRAOHM 413. A measurement current
of 200 mA and the automatic registration of values
assure reliable measurement results. By use of any
measurement lines resistance is measured between
reference earth (e. g. equipotential bonding strip)
and other test points.
1.1 Intended use
This device is intended for use in applications as
described in the operating instructions only. Thus,
it is imperative to observe the notes on safety and
the technical data in conjunction with the ambient
conditions.
Any other form of usage is not permitted and can
lead to accidents or destruction of the unit.
Any misuse will result in the forfeit of all guarantee
and warranty claims.
2. Safety
You have selected a measuring instrument which
provides a high level of safety. It meets requirements
in accordance with EN/IEC 61557-1+4 (VDE 0413
part 1+4) and EN/IEC 61010.
In order to assure safe and proper use, it is impe-
rative that you read these operating instructions
thoroughly and completely before placing your in-
strument into service. All points included in these
operating instructions must be followed carefully
when using the instrument.
Please observe the following safety precautions:
The METRAOHM 413 may only be used for power
systems with an operating voltage of maximum
400 V.
In conformity with standard DIN EN 61010-031,
measurements in environments according to
measurement category III may only be perfor-
med with the safety cap applied to the test probe
of the measurement cable.
Measurements may only be taken at voltage-free
system components.
Use the contact-protected plug (IP 2x with
shrouded contacts) for the socket of the
METRAOHM 413, when you test at measuring
points where voltages may occur.
If the instrument comes into contact with a
voltage of over 15 V in its switched-on condition,
an acoustic, as well as an optical warning, is
generated (see 4.5). No measurements may be
made at this conductor until it is made voltage-
free.
