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30
Important Notes
unit. A fuse may only be replaced if the instrument has
been disconnected from the mains rst 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.
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.
Fuse types:
Micro fuse 5 x 20 mm slow; 250 V~
IEC 60127-2/5; EN 60127-2/5
R&S®HMP2020 / R&S®HMP2030:
Mains voltage Fuse nominal current
115 V 2 x 6 A
230 V 2 x 3.15 A
R&S®HMP4030 / R&S®HMP4040:
Mains voltage Fuse nominal current
115 V 2 x 10 A
230 V 2 x 5 A
1.13 Batteries and Rechargeable Batteries/Cells
1. Cells must not be disassembled, opened or crushed.
2. Cells and batteries may not be exposed to heat or re.
Storage in direct sunlight must be avoided. Keep cells
and batteries clean and dry. Clean soiled connectors
using a dry, clean cloth.
3. Cells or batteries must not be short-circuited. Cells or
batteries must not be stored in a box or in a drawer
where they can short-circuit each other, or where they
When changing the mains voltage, it is essential to replace the
fuse. Otherwise the instrument may be destroyed.
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.
If the information regarding batteries and rechargeable batter-
ies/cells is not observed either at all or to the extent necessary,
product users may be exposed to the risk of explosions, re and/
or serious personal injury, and, in some cases, death. Batter-
ies and rechargeable batteries with alkaline electrolytes (e.g.
lithium cells) must be handled in accordance with the EN 62133
standard.
1.11 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
DC
(peak value) in this
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, rmly installed sockets, rmly 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.
1.12 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 gure).
Replacing a Fuse
The input line fuses are accessible externally. The integral
plug for a cooling unit and the fuse holder form a single
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)!
Fig. 1.1:
Voltage selector
for the R&S®HMP2030
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