2
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cesses of the unit beneath, ensuring that the top instrument
does not slide off. The sloped position can only be used for
the uppermost unit of the stack.
The supplied connecting cord is used to connect the unit to
the AC mains. The cord is inserted into the equipment con-
nector at the back of the unit. The mains switch for operating
the unit is situated in the immediate vicinity of the equipment
connecting plug at the back of the unit.
The centre of the back plane provides a thread for the at-
tachment of the support clamp for small case (02043-10),
which is optional available (see Fig. 2). By use of that clamp,
the unit can be fixed to various support rods. Thereby, the
visibility will be increased in demonstration experiments.
To avoid damage to the inner electrical components of the
unit and to prevent people from getting harmed by electric
shock, use the provided support clamp 02043-10, only.
You must not use screws with lengths over 16 mm!
Fig. 2:
Back plane of a device in the small case with support clamp
attached.
All other functional and operating elements are located on the
front panel of the unit (see Fig. 1:):
1
Power
On/Off indicator light.
2
Socket ring
For selection of the voltage step at output (
3
) for the alternat-
ing voltage tapped and at output (
4
) for the direct voltage
tapped. The selection is made by plugging a special short-
circuiting plug into the central socket and the appropriate
socket in the ring.
3
Output,
2…12 V
DC
/
max. 5 A
P
air of 4 mm sockets for the tapping of a direct voltage; the se-
lection of the size of the voltage is made by means of the
socket ring (
2
).
4
Output
2…14 V
AC
/
max. 5 A
Pair of 4 mm sockets for the tapping of an alternating voltage;
the selection of the size of the voltage is made by means of the
socket ring (
2
).
5
Overload circuit breaker
With thermal triggering for protection of both voltage outputs.
4 NOTES ON OPERATION
This high-quality instrument fulfils all of the technical re-
quirements that are compiled in current EC guidelines. The
characteristics of this product qualify it for the CE mark.
This instrument is only to be put into operation under special-
ist supervision in a controlled electromagnetic environment in
research, educational and training facilities (schools, universi-
ties, institutes and laboratories).
5 HANDLING
Two separate outputs (AC/DC) are available in the form of
4
mm safety sockets. They can be simultaneously used.
Each output can be individually loaded up to 5
A: When they
are both under load simultaneously, the total load capacity is
75
VA.
Direct voltage output sockets are not to be connected to al-
ternating voltage output sockets, as the two types of output
are not galvanically isolated from each other.
All outputs are galvanically isolated from the mains, un-
grounded and safeguarded by a circuit breaker. The primary
side of the instrument is additionally protected by a G fuse
element.
The output voltages are dependent on the load. The curves
in Fig. 3 and Fig. 4 show the main courses of the output
characteristics
V
=
f
(
I
) for the two outputs. The exact voltage
values can differ a little from instrument to instrument; in ad-
dition, they are dependent on the grid voltage.
Should the overload circuit breaker (situated above the volt-
age outputs) be triggered due to overloading of the instru-
ment, a few seconds must pass before it can be pushed in
again, to give the bimetalllic switch time to cool down. The
cause of the overloading should be previously eliminated,
however.
Changing the primary safety fuse
The fuse holder is in the upper part of the mains socket of the
instrument, and so is only accessible when the connecting
cord is not plugged in. Unplug the connecting cord, open the
fuse holder using a screwdriver, take out the defect fuse and
replace it with a new one (first check the specification of this
against the data on the type plate), then fit the fuse holder
back in the mains socket.
Should this fuse blow when the instrument is switched on,
never replace it with a more resistant fuse! A defect is indi-
cated and the instrument must be returned to the Phywe ser-
vice department for repair.
6 TECHNICAL DATA
(typical fo
r 25 °C)
operating temperature range
5…40 °C
relative humidity
<
80 %
Mains power supply
protection class
I
connection voltage
see type plate
(+6 % / −10 %)
mains frequency
50/
60 Hz
power consumption
80 VA
mains fuse
see type plate
(5 mm x 20 mm)
secondary fuse
overcurrent protective switch
housing dimensions (mm)
194 x 130 x 140 (WxHxD)
weight
approx. 2.97
kg
Attention!