Rohde & Schwarz Hameg HM8115-2G Handbuch Seite 38

O p e r a t i n g c o n t r o l s a n d d i s p l a y s
The safety plugs may become quite hot
at high currents.
STOP STOP
The upper two terminals (red) are internally con-
nected. Do not apply any voltage, this would be
short-circuited
The shunt is connected internally between the two
lower (black) terminals. Do not apply any voltage
STOP either because this would practically short-circuit it.
The shunt is protected by a fuse which is accessible from the
front. Do not attempt to "repair" a blown fuse or bridge it. Dis-
connect the input voltage before changing a fuse.
The current path is designed for a maximum of 16 Arms, hence
a FF 16 A is specifi ed.
The maximum input voltage is 500 V. The maximum
peak voltage between any of the 4 terminals and
the instrument housing = protectve earth is 500 V.
Please note: Any voltage higher than those listed is
considered dangerous:
st
1 30 V ;
rms
nd
2 42.4 V ;
p
rd
3 60 V .
DC
Only qualifi ed personnel well aware of the poten-
tial dangers is authorized to apply voltages higher
than those listed. The relevant safety rules must
be observed.
Fuses in the measuring circuit
The front panel fuse (FF 16 A)
protects the shunt. The cir-
cuit is designed for 16 Arms.
Type of fuse: FF 16 A 250 V,
size 6.3 x 32 mm, US stan-
dard: UL198G, CSA22-2 No.
590
Before exchanging a blown fuse the input voltage must be
disconnected. Do not attempt to „repair" a blown fuse or to
bridge it.
Changing the measuring circuit fuse
The measuring circuit fuse
Before exchanging the fuse remove all connections to the IN-
PUT and OUTPUT terminals. Disconnect the HM8115-2
from the mains. Use a suitable screwdriver to turn the top of
the fuseholder counterclockwise while depressing it. The top
and the fuse can then be easily removed. Use only the speci-
fi ed type of fuse and do not attempt to „repair" a blown fuse
or to bridge it. Any damage caused by using false fuses or by
bridging it will void the warranty.
36
Subject to change without notice
12 13 14
is accessible on the front panel.
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Serial interface
The RS-232 interface connector is located on the rear panel
(9-pin submin D). This bidirectional interface allows fetching of
data from the instrument and to remotely control it.
Mains voltage selector
The instrument can be powered by 115 or 230 V, 50 or 60 Hz.
The voltage selector switch is used to set the correct voltage.
Any change requires that the mains fuse be changed to the
appropriate value as indicated on the rear panel.
Mains voltage connector with integrated fuse holder
The mains connector is a standard type accepting cables with
plugs according to DIN 49457.
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