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MI 3108 EurotestPV Safety and operational considerations
8
Hazardous voltages exist inside the instrument. Disconnect all test leads,
remove the power supply cable and switch off the instrument before
removing battery compartment cover.
Do not connect any voltage source on C1 and P/C2 inputs. They are
intended only for connection of current clamps and sensors. Maximal input
voltage is 3 V!
All normal safety precautions must be taken in order to avoid risk of
electric shock while working on electrical installations!
If the instrument is not in SOLAR operating mode the instrument displays a
warning if an external DC voltage of higher than 50 V is applied to the
instrument. Measurements are blocked.
Warnings related to safety of measurement functions:
All PV functions
Use only dedicated accessories for testing on PV electrical installations.
Accessories for PV installations have yellow marked connectors.
Appropriate warnings are displayed.
PV Safety probe A1384 has inbuilt protective circuit that safely disconnects the
instrument from the PV installation in case of a failure in the instrument.
PV test lead A1385 has integrated fuses that safely disconnects instrument from
the PV installation in case of a failure in the instrument.
Do not use the instrument in PV systems with voltages higher than 1000 V
d.c. and/ or currents higher than 15 A d.c. ! Otherwise the instrument can
be damaged.
PV sources can produce very high voltages and currents. Only skilled and
trained personnel should perform measurements on photovoltaic systems.
Local regulations should be considered.
Safety precautions for working on the roof should be considered.
In case of a fault in the measuring system (wires, devices, connections,
measuring instrument, accessories), presence of flammable gases, very
high moisture or heavy dust an electrical arc can occur that will not
extinguish by itself. Arcs can lead to fire and can cause heavy damage.
Users must be skilled to disconnect the PV system safely in this case.
Insulation resistance, Insulation resistance of PV systems
Insulation resistance measurement should only be performed on de-energized
objects!
Do not touch the test object during the measurement or before it is fully
discharged! Risk of electric shock!
When an insulation resistance measurement has been performed on a capacitive
object, automatic discharge may not be done immediately! The warning message
and the actual voltage are displayed during discharge until voltage drops
below 10 V.
Continuity functions
8


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