Maintenance; Measurement Categories; Switching The Mains Voltage And Replacing A Fuse - Hameg HMP Series User Manual

Important Notes
technical personnel. Only original parts may be used for
replacing parts relevant to safety (e.g. power switches,
power transformers, fuses). A safety test must always
be performed after parts relevant to safety have been
replaced (visual inspection, PE conductor test, insulation
resistance measurement, leakage current measurement,
functional test). This helps ensure the continued safety of
the product.

1 . 1 0 Maintenance

Clean the outer case of the measuring instrument at regular
intervals, using a soft, lint-free dust cloth.
The display may only be cleaned with water or an ap-
propriate glass cleaner (not with alcohol or other cleaning
agents). Follow this step by rubbing the display down with
a dry, clean and lint-free cloth. Do not allow cleaning fluid
to enter the instrument. The use of other cleaning agents
may damage the labeling or plastic and lacquered sur-
faces.
Before cleaning the measuring instrument, please make sure that
it has been switched off and disconnected from all power sup-
plies (e.g. AC supply network or battery).
No parts of the instruments may be cleaned with chemical clean-
ing agents (such as alcohol, acetone or cellulose thinner)!

1 . 1 1 Measurement Categories

This instrument is designed for measurements on circuits
that are only indirectly connected to the low voltage mains
or not connected at all. The instrument is not intended
for measurements within the measurement categories II,
III or IV; the maximum potential against earth generated
by the user must not exceed 150V
application. The following information refers solely to user
safety. Other aspects, such as the maximum voltage, are
described in the technical data and must also be observed.
The measurement categories refer to transients that are
superimposed on the mains voltage. Transients are short,
very fast (steep) current and voltage variations which may
occur periodically and non-periodically. The level of poten-
tial transients increases as the distance to the source of
the low voltage installation decreases.
❙ Measurement CAT IV: Measurements at the source of the
low voltage installations (e.g. meters)
❙ Measurement CAT III: Measurements in building
installations (e.g. power distribution installations, power
switches, firmly installed sockets, firmly installed engines
etc.).
❙ Measurement CAT II: Measurements on circuits
electronically directly connected to the mains (e.g.
household appliances, power tools, etc.)
❙ 0 (instruments without measured measurement
category): Other circuits that are not connected directly
to the mains.
28
(peak value) in this
DC
1 . 1 2 Switching the Mains Voltage and
Replacing a Fuse
Switching the Mains Voltage
Prior to operating the instrument, please check if the
available mains voltage (115 V or 230 V) corresponds to
the value indicated on the voltage selector of the instru-
ment. If this is not the case, the main voltage will need to
be switched. The voltage selector is located on the back of
the instrument (see figure).
Replacing a Fuse
The input line fuses are accessible externally. The integral
plug for a cooling unit and the fuse holder form a single
unit. A fuse may only be replaced if the instrument has
been disconnected from the mains first and if the power
cable has been removed. The fuse holder and power cable
must be undamaged. Use a suitable screwdriver (with a
blade width of approximately 2 mm) to push the plastic
locking mechanisms to the left and right side of the fuse
holder inwards. The insertion point is marked by two
slanted guides on the casing. When unlocking the mecha-
nism, the fuse holder will be pushed outwards by com-
pression springs and it can then be removed. The fuses are
now accessible and can be removed as necessary.
When changing the mains voltage, it is essential to replace the
fuse. Otherwise the instrument may be destroyed.
Please note that the protruding contact springs must not
be deformed. It is only possible to insert the fuse holder if
the guide points toward the connector. The fuse holder will
be inserted against the spring pressure until both plastic
locking mechanisms lock into place.
It is hazardous and not permitted to repair a defective fuse or
to use other tools to bypass the fuse. Resulting damage to the
instrument are not covered by the warranty.
Fuse types:
Micro fuse 5 x 20 mm slow; 250 V~
IEC 60127-2/5; EN 60127-2/5
HMP2020 / HMP2030:
Mains voltage Fuse nominal current
115 V
230 V
HMP4030 / HMP4040:
Mains voltage Fuse nominal current
115 V
230 V
Fig. 1.1:
Voltage selector
for the HMP2030
2 x 6 A
2 x 3.15 A
2 x 10 A
2 x 5 A