3B SCIENTIFIC U8521400 User manual

3B SCIENTIFIC®PHYSICS
1
DC Power Supply 450 V U8521400
Instruction sheet
05/10 ALF
1 Control panel for 450 V DC
output
2 Control panel for 12 V DC
output
3 Control panel for 12 V AC
output
4 Mains on/off switch
5 Mains connection
1. Safety instructions
The DC power supply 450 V conforms to all safety regula-
tions for electrical measuring, control, monitoring and
laboratory equipment, as specified under DIN EN 61010,
Section 1, and the equipment has been designed to meet
protection class II. It is intended for operation in a dry
environment, suitable for the operation of electrical
equipment and systems.
Safe operation of the equipment is guaranteed, pro-
vided it is used correctly. However, there is no guar-
antee of safety if the equipment is used in an im-
proper or careless manner.
If it may be assumed for any reason that non-hazardous
operation will not be possible (e.g. visible damage), the
equipment should be switched off immediately and
secured against any unintended use.
In schools and other educational institutions, the
operation of the power supply unit must be super-
vised by qualified personnel.
•Before using the power supply unit for the first
time, confirm that the specifications printed on
the rear side of the housing are compatible with
the local mains voltage.
•Before using the power supply unit for the first
time, check the housing and the mains lead for
any damage. In the event of any malfunc-
tion/operational defect or visible damage, switch
off the unit immediately and secure it against
unintended use.
•Before making any connections, check the ex-
periment leads for damaged insulation and ex-
posed wires.
•The equipment may only be opened/repaired by
qualified and trained personnel.

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2. Description
The DC power supply 450 V is designed to supply
power for electrostatics experiments, in particular
experiments using an electrometer (U8531408).
It possesses two DC outputs and an AC output, all of
which are protected against short circuits.
The power supply with the item number U8521400-
115 is for operation with a mains voltage of 115 V
(±10%), and the transformer with the item number
U8521400-230 unit is for operation with a mains
voltage of 230 V (±10%).
3. Technical data
Mains voltage: see rear of housing 230/115
V AC, 50/60 Hz, 10 VA
Fuses: Internal quick-blow fuses
5x20, 250 V AC,
T800 mA for 115 V AC
T400 mA for 230 V AC
Output 1:
Voltage: 0 – 450 V DC , continuously
adjustable
Max. current: 10 µA
Internal resistance: 1 MΩ
Output 2:
Voltage: 1.2 – 12 V DC, continuously
adjustable
Max. current: 100 mA
Output 3:
Voltage: 0 – 12 V AC, continuously
adjustable
Max. current: 10 mA
Terminals: 4 mm safety sockets
Dimensions: 250x100x160 mm³ approx.
Weight: 0.8 kg approx.
4. Operation
4.1 General information
•The AC and DC outputs cannot be used at the
same time
•Before connecting the plug to the power supply,
set the voltage selector switch to zero.
4.2 Obtaining an AC voltage
•Connect the load to the AC output sockets (3).
•Set the voltage selector switch (3) to give the
required voltage; if necessary connect a voltme-
ter in parallel with the load.
4.3 Obtaining a DC voltage
•Connect the load to the DC output sockets (1 or 2).
•Set the voltage selector switch (1 or ) to give the
required voltage; if necessary connect a voltme-
ter in parallel with the load.
5. Sample experiments
5.1 External photoelectric effect (Hallwachs ef-
fect)
Equipment
1 DC Power Supply 450 V (230 V, 50/60 Hz)
U8521400-230
1 Control Unit for Spectrum Lamps (230 V, 50/60 Hz)
U21905-230
1 Electrometer (230 V, 50/60 Hz) U8531408-230
or
1 DC Power Supply 450 V (115 V, 50/60 Hz)
U8521400-115
1 Control Unit for Spectrum Lamps 115 V, 50/60 Hz)
U21905-115
1 Electrometer (115 V, 50/60 Hz) U8531408-115
1 High-Pressure Mercury Vapour Lamp
U8473155
1 Grid electrode, 1 Zinc electrode,
1 Metal rod with 4-mm drilled hole
1 SK plug-in resistor 10 GΩ
from Electrometer Accessories U8531420
1 Multimeter AM50 U17450
1 Tripod Stand, 150 mm U13270
1 Stainless Steel Rod, 250 mm U15001
1 Universal Clamp U13255
Connection leads
5.2 Recording equipotential lines of electric
fields
Equipment
1 DC Power Supply 450 V (230 V, 50/60 Hz)
U8521400-230
or
1 DC Power Supply 450 V (115 V, 50/60 Hz)
U8521400-115
1 Electrolyte Trough U51001
1 Multimeter AM50 U17450
Connection leads
400 cm3distilled water

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Subject to technical amendments
© Copyright 2010 3B Scientific GmbH
DC 0...450 V DC 1.2...12 V / 100 mA AC 0...12 V / 10 mA
U8521400
001.2450 1212
++
--
U17450
U21905
U8531408
IN
OUT
IN
0
Fig. 1 External photoelectric effect (Hallwachs effect)
DC 0...450 V DC 1.2...12 V / 100 mA AC 0...12 V / 10 mA
U8521400
001.2450 1212
++
--
U17450
Fig. 2 Recording equipotential lines of electric fields