Tietzsch MegaSafe EP 4 Bedienungsanleitung Seite 19

1. Applications
The ΩMegaSafe EP 4 is a digital displaying
measuring instrument for the detection of low
impedance from 10 mΩ up to 2000 kΩ.
The EP 4 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 EP 4.
A measurement current of 200 mA and the automa-
tic registration of values assure reliable measure-
ment results.
By use of any measurement lines resistance is
measured between reference earth (e. g. a equipo-
tential bonding strip) and other test points.
The Ex-performance of the EP 4 is called EP 4Ex.
The use of both devices is similar.
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 EP 4 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 EP 4,
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.
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