3B Scientific AC__DC Power Supply 0 – 30 V, 0 – 6 A (230 V, 50__60 Hz) - Manual (Page 2)

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• Never cover the ventilation slots in the housing.
This is necessary in order to ensure sufficient cir-
culation of air required for cooling the internal
components of the equipment.
• Do not place the power supply unit on damp or
wet surfaces.
• Do not subject the power supply unit to extreme
humidity or dampness and extreme temperatures
(direct sunlight), shocks or strong vibrations.
• The equipment may only be opened/repaired by
qualified and trained personnel.
2. Description
The AC/DC Power Supply 0 - 30 V, 6 A provides AC and
DC voltages up to 30 V with a current up to 6 A.
The unit may be used as constant voltage supply with
current limiting or as constant current source with
voltage limitation for DC outputs. The AC output is
equipped with a current limiter.
The AC and DC output voltages and currents are con-
tinuously adjustable and are tapped from the corre-
sponding output sockets. The unit is equipped with
separate digital volt- and ammeters (3 digits LCDs).
Cooling of the internal components is provided by a
ventilator. The DC voltage is stabilised. The AC and DC
outputs are electrically isolated from each other, and
have short-circuit protection.
The 1008692 AC/DC power supply is for operation
with a mains voltage of 115 V (±10%), and the
1003593 unit is for operation with a mains voltage of
230 V (±10%).
3. Technical data
DC output:
Voltage: 0 – 30 V, continuously ad-
justable
Current: 0 – 6 A
Ripple & noise: CV 1 mVrms, CC 3 mArms
Display accuracy: Voltmeter ± (0,2% +2 digits)
Ammeter ± (1% +2 digits)
AC output:
Voltage: 0 – 30 V, continuously ad-
justable
Current: 0 – 6 A
Display accuracy: Voltmeter ± (1% +2 digits)
Ammeter ± (1% +2 digits)
Mains voltage: 220 V – 240 V AC ± 10%
Terminals: 4 mm safety sockets
Dimensions: 380 x 140 x 300 mm 3
Weight: 12 kg approx.
4. Operation
4.1 Obtaining a DC voltage
Used as a constant voltage source (CV) in general the
current regulator (CC) should be set to maximum.
To set the current limiting protection point:
• Switch on the power supply and turn the current
regulator (CC) counter clockwise to minimum.
• Short circuit the positive and negative output
sockets and rotate the current regulator (CC)
clockwise until the output current equals the re-
quired current limiting value.
4.1.1 Using the power supply as a constant voltage
source (CV)
• Turn the current regulator (CC) clockwise to
maximum.
• Switch on the power supply and adjust the volt-
age to the required value by turning the voltage
regulator (CV). The CC-LED goes out and the CV-
LED lights up.
• Switch off the power supply.
• Connect the load to the DC output sockets and
turn on the power supply again.
4.1.2 Using the power supply as a constant current
source (CC)
• Switch on the power supply and turn the voltage
regulator (CV) to maximum.
• Turn the current regulator (CC) counter clockwise
to minimum.
• Connect the load to the DC output sockets and set
the required current value by turning the current
regulator (CC) clockwise. The CV-LED goes out and
the CC-LED lights up.
4.2 Obtaining an AC voltage
• Switch on the power supply and turn the current
regulator clockwise to maximum.
• Adjust the voltage to the required value by turn-
ing the voltage regulator.
• Switch off the power supply.
• Connect the load to the AC output sockets and
turn on the power supply again.
Alternatively:
• Switch on the power supply and turn the voltage
regulator clockwise to maximum.
• Turn the current regulator counter clockwise to
minimum.
• Switch off the power supply.
• Connect the load to the AC output sockets and
turn on the power supply again.
• Adjust the current to the required value by turn-
ing the current regulator.
The power supply automatically will switch off, if the
current exceeds the set value and the OC LED lights
up. The power supply turns on after a short period
and will switch off again, if no corrective measures
are taken. In this case set a higher current limit or
lower the voltage.