1 Safety
MPI-520 meter is designed for performing check tests of protection against electric shock in
mains systems. The meter is used for making the measurements the results of which determine safe-
ty of electrical installations. Therefore, in order to provide conditions for correct operation and the cor-
rectness of the obtained results, the following recommendations must be observed:
Before you proceed to operate the meter, acquaint yourself thoroughly with the present manual
and observe the safety regulations and specifications determined by the producer.
The MPI-520 meter has been designed for the purpose of measurements of earth connection and
equipotential bonding, ground resistivity, as well as clamps current measurements. Any applica-
tion that differs from those specified in the present manual may result in a damage to the device
and constitute a source of danger for the user.
The device must be operated solely by appropriately qualified personnel with relevant certificates
to realise measurements of electric installation. Operation of the meter realised by unauthorised
personnel may result in damage to the device and constitute a source of danger for the user.
Using this manual does not exclude the need to comply with occupational health and safety regu-
lations and with other relevant fire regulations required during the performance of a particular type
of work. Before starting the work with the device in special environments, e.g. potentially fire-
risk/explosive environment, it is necessary to consult it with the person responsible for health and
safety.
It is unacceptable to operate the following:
A damaged meter which is completely or partially out of order,
A meter with damaged test leads insulation,
A meter stored for an excessive period of time in disadvantageous conditions (e.g. excessive
humidity). If the meter has been transferred from a cool to a warm environment of a high level
of relative humidity, do not realise measurements until the meter has been warmed up to the
ambient temperature (approximately 30 minutes).
It should be remembered that BAT message appearing on the display indicates that supply volt-
age of the meter is too low. This message signals also that the batteries must be replaced or the
accumulator charged. Measurements performed by means of the meter whose supply voltage is
too low are burdened with additional errors that are impossible to be estimated by the user. Such
measurements must not be relied on in order to state correctness of protection of a network test-
ed.
Battery spill and damage to the meter may occur if discharged batteries are left in the meter.
Before measurements may commence, make sure the test leads are connected to the appropri-
ate measurement sockets.
Do not operate a meter with an open or incorrectly closed battery (accumulator) compartment or
power it from other sources than those specified in the present manual.
The R
ISO
inputs of the meter are protected electronically from overload (e.g. due to having been
connected to a live circuit) up to 440V rms for 60 seconds.
Repairs may be realised solely by an authorised service point.
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