3B Scientific AC__DC Power Supply 0-20 V, 0-5 A (230 V, 50__60 Hz) User Manual

Page 2

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2

Before making any connections, check the
experiment leads for damaged insulation
and exposed wires.

Replace a faulty fuse only with one matching
the specifications stated at the rear of the
housing.

Disconnect the equipment from the mains
before replacing a fuse.

Never short the fuse or the fuse holder.

Never cover the air vents in the housing.
This is necessary in order to ensure suffi-
cient circulation of air required for cooling
the internal components of the equipment.

The equipment may only be
opened/repaired by qualified and trained
personnel.


2. Description

The 0-20 V/5 A AC/DC power supply unit pro-
vides a continuous DC voltage which can be
regulated between 0 V and 20 V at a current of
5 A. The unit is also equipped with a voltage and
current limiting system that can automatically
switch from one mode to the other and which
makes the equipment proof against any pro-
longed short circuits. The AC voltage can be
selected to any of 8 levels: the output is pro-
tected by an overload protective switch.
The AC and DC outputs are galvanically isolated
from one another. A temperature-controlled fan
protects the equipment from overheating.
The apparatus 1003561 is for operation with a
mains voltage of 115 V (±10%), and the unit
1003562 is for operation with a mains voltage of
230 V (±10%).


3. Technical data

DC voltage output:
Output voltage:

0-20 V, electronically regu-
lated, continuously adjustable

Load capacity:

0-5 A, protected against
short circuit

Ripple voltage U: < 10 mV

rms

Connections:

4-mm safety connectors

AC voltage output:
Output voltage:

2 V, 4 V, 6 V, 8 V, 10 V,
12 V, 15 V, 20 V

Load capacity:

max. 5 A, protected by
overload protection switch

Connections:

4-mm safety connectors

Miscellaneous data:
Mains voltage:

See rear of equipment
housing

Primary fuse:

See rear of equipment
housing

Dimensions:

235 Ч 175 Ч 245 mm

3

Weight:

8 kg approx.


4. Operation

4.1 Operation as a DC voltage source:

Set the current and voltage regulators to the
0 position (turn the knob fully to the left).

If necessary, short the output.

Set the current regulator to the desired
maximum current.

Remove the short and connect the load to
the output.

Set the DC voltage regulator to the desired
DC voltage.

4.2 Operation as a DC current source:

Set the current and voltage regulators to the
0 position (turn the knob fully to the left).

Turn the DC voltage regulator knob to its
maximum value, or set the desired maxi-
mum voltage.

Connect the load to the output.

Turn the DC voltage regulator knob to its
maximum value.

Set the DC current regulator to the desired
DC current.

4.3 Operation as a source of AC voltage:

Connect the load to the AC current output.

Turn the switch to the desired AC voltage.


5. Fuse

5.1 Changing the primary fuse:

Disconnect the plug from the mains supply.

Remove the outer casings of the housing.

Replace the faulty fuse with a new one.

Assemble the outer casings of the housing
in reverse order.

5.2 Overload protection switch:
If the overload protection switch has tripped:

Disconnect the cause of the overload.

Press the overload protection switch.

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