User guide

Elwe Didactic GmbH ▪ Steinfelsstr. 5 ▪ 08248 Klingenthal ▪ Germany ▪ www.elwedidactic.com
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com
Subject to technical amendments
© Copyright 2012 3B Scientific GmbH
age. In the event of any malfunc-
tion/operational defect or visible damage,
switch off the unit immediately and secure it
from unintentional use.
• The instrument may only be connected to
the mains via a socket that has an earth
connection.
• Before making any connections, check the
experiment leads for damaged insulation
and exposed wires.
• Never cover the air vents and heat sink at
the rear of the housing. These are neces-
sary in order to ensure sufficient circulation
of air required for cooling the components
inside the equipment.
• The equipment may only be
opened/repaired by qualified and trained
personnel.
2. Description
The transformer with rectifier provides AC and
DC voltages that can be varied from 2 V to 14 V
in steps of 2 V. The outputs are insulated from
the mains supply line. The built-in bridge rectifier
with downstream charging capacitor provides
smoothed DC voltages. The voltage outputs are
protected by a thermal safety cutout.
The transformer 1003557 is for operation with a
mains voltage of 115 V (±10%), and the unit
1003558 is for operation with a mains voltage of
230 V (±10%).
3. Technical data
Mains supply voltage: see rear panel
Output voltages: 2 V AC/DC
4 V AC/DC
6 V AC/DC
8 V AC/DC
10 V AC/DC
12 V AC/DC
14 V AC/DC
Output current: max. 5 A
Connections: 4 mm safety sockets
Dimensions: 260x 140x 130 mm
3
approx.
Mass: 3.1 kg approx
4. Operation
Caution:
The AC and DC outputs cannot be used at the
same time.
4.1 Obtaining an AC voltage
• Connect the unit to the mains supply.
• Connect the load to the AC output sockets.
• Set the voltage control to give the required
voltage; if necessary connect a voltmeter in
parallel with the load.
• Push the mains switch to the up position; the
mains indicator light shows green.
4.2 Obtaining a DC voltage
• Connect the unit to the mains supply.
• Connect the load to the DC output sockets.
• Set the voltage control to give the required
voltage; if necessary connect a voltmeter in
parallel with the load.
• Push the mains switch to the up position; the
mains indicator light shows green.
5. Safety instructions
Overcurrent cutout switch:
If the overcurrent cutout switch has tripped:
• Disconnect the mains plug.
• Determine the cause of the overcurrent and
eliminate it.
• Re-connect the unit to the mains supply.
• Press the overcurrent cutout switch.
6. Care and maintenance
• Before cleaning the equipment, disconnect it
from its power supply.
• Use a soft, damp cloth to clean it.
7. Disposal
• The packaging should be disposed of at
local recycling points.
• Should you need to dispose of the equip-
ment itself, never throw it away in normal
domestic waste. Local regulations for the
disposal of electrical equipment will apply.