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•

The instrument may only be connected to the

mains via a socket that has an earth connec-

tion.

•

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 sufficient circula-

tion 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, 0 – 5 A DC power supply provides a

DC voltage up to 20 V and a DC current up to 5 A.

The output voltage and output current are con-

tinuously variable. The unit can be used either as a

constant voltage source with current limitation or

as a constant current source with voltage limita-

tion. When the cv LED is illuminated it shows that

the unit is operating as a constant voltage source,

whereas the cc LED shows that it is operating as a

constant current source. The output is protected

against short-circuiting.

The 1003311 DC power supply is for operation with

a mains voltage of 115 V (±10%), and the 1003312

unit is for operation with a mains voltage of 230 V

(±10%).

3. Technical data

Mains voltage:

DC output:

Output power:

Stability under full load:

Residual ripple:

Displays:

Primary fuse:

Terminals:

Dimensions:

Weight:

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •

see rear of housing

0 – 20 V, 0 – 5 A

100 W

≤

0,01% + 5 mV,

≤

0,2% + 5 mA

≤

1 mV, 3 mA

2 x 3 digit LED

see rear of housing

4 mm safety sockets

130x150x300 mm

approx.

4.7 kg approx.

Subject to technical amendments

4. Operation

4.1 General information

•

Before switching on the power supply, set the

current and voltage regulators to zero (turn

fully to the left).

•

Connect the power supply to the experimental

setup.

•

Do not switch the power supply on until the

experiment has been fully assembled.

•

Changes to the experimental setup must only

be made with the power supply switched off.

•

Set the current regulator to give the required

current.

•

Set the coarse and fine voltage regulators to

give the required voltage.

•

Before switching off the power supply, set the

current and voltage regulators to zero again

(turn fully to the left).

4.2 Changing the fuse

•

Turn off the power switch and unplug the

mains plug.

•

Unscrew the fuse holder on the rear side of the

housing with a screwdriver.

•

Replace the fuse and reinsert the holder in its

socket.

5. Care and maintenance

•

Before cleaning the equipment, disconnect it

from its power supply.

•

Use a soft, damp cloth to clean it.

6. Disposal

•

The packaging should be disposed of at local

recycling points.

•

Should you need to dispose of the equipment

itself, never throw it away in normal domestic

waste. Local regulations for the disposal of

electrical equipment will apply.