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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.
The upper two terminals (red) are internally
connected. Do not apply any voltage, this would be
short-circuited.
The shunt is connected internally between the two lo-
wer (black) terminals. Do not apply any voltage 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 A
a FF 16 A is specified.
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:
1
st
30 V
;
rms
2
nd
42.4 V
;
p
3
rd
60 V
.
DC
Only qualified 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
13
The Front panel fuse (FF 16 A)
protects the shunt. The circuit
is designed for 16 A
.
rms
Type of fuse: FF 16 A 250 V,
size 6.3 x 32 mm, US standard:
UL198G, CSA22-2 No. 590
Before exchanging a blown fuse the input voltage must be dis-
connected. Do not attempt to „repair" a blown fuse or to bridge it.
Changing the measuring circuit fuse
The measuring circuit fuse
13
Before exchanging the fuse remove all connections to the IN-
PUT
and OUTPUT
terminals. Disconnect the HM8115-2
12
14
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 specified
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
, hence
rms
12
13
is accessible on the front panel.
15
Interfaces
15
The USB/RS-232 interface is located on the rear panel. This
interface allows to transfer data between the instrument and
an external PC.
The Power meter HM8115-2G is equipped with the interface
IEEE-488 (GPIB).
Mains voltage selector
16
The instrument can be powered by 115 V or 230 V, 50 Hz 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
17
The mains connector is a standard type accepting cables with
plugs according to DIN 49457.
14
16
17
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