Instruction Sheet 521721 High Voltage Power Supply

Instruction Sheet 521721 High Voltage Power Supply
Instruction Sheet 521,721
High Voltage Power Supply 25 kV (521 721)
0...25 kV
max.0,5 mA , max 200mJ
521 721
Mains switch, with ready indicator
High-voltage display
Control input
High voltage output, potential-free
Ground connection
Carrying handle
Mains connection, primary fuse
Folding feet
Safety notes
The high voltage power supply 25 kV fulfills the safety requirements for electrical equipment for measurement, control and
laboratory use according to DIN EN 61010 part 1 and is constructed so as to fulfill the requirements of protection class II.
It is intended for operation in dry rooms which are suitable for
electrical operating equipment or installations.
the high voltage power supply supplies a non-hazardous contact voltage. According to EN 61010-1 (VDE 0411) a contact
hazard is not deemed to exist at DC voltages greater than
60 V (protective extra-low voltage) when the current through
an induction-free resistance of 2 kΩ is not greater than 2 mA,
and additionally, the charge for voltages up to 15 kV is less
than 45 µAs and at voltages above 15 kV the stored energy
does not exceed 350 mJ.
Operational safety of the high voltage power supply is ensured when the device is used as intended. However, safety
cannot be guaranteed if the device is used improperly or
handled carelessly. Whenever there are grounds for assuming that safe operation may no longer be possible (e.g. when
the device is visibly damaged), shut off the device immediately .
• Before putting the high voltage power supply 25 kV into operation, always inspect the housing and the control and display elements for visible damage. In the event of malfunctions
or visible damage, shut off the device and make sure that it
cannot be activated inadvertently.
• Do not connect multiple high voltage power supplies in
• Always make sure the high voltage power supply 25 kV is
switched off before connecting or altering the experiment setup.
• Set up the experiment so that neither non-insulated parts nor
cables and plugs can be touched.
• In the experiment setups, remember that internal ground
connection of the ground terminal and the bottom socket of
the control input are connected and avoid ground loops.
• Use high voltage cables (501 051) to make all connections,
or keep a minimum distance of 9 cm between experiment
leads and conductive surface (benchtop, experiment devices) to avoid high-voltage arcing.
• Always set the output voltage to zero before switching on the
high voltage power supply 25 kV (turn the knob all the way to
the left).
• Do not connect any capacitors with a capacitance of 0.5 nF
or more, as at 25 kV a contact hazard exists for 1 nF, and the
high voltage power supply already accounts for 0.5 nF.
• Do not connect any high-vacuum tubes, as the x-rays generated in such a configuration can significantly exceed the
maximum legal limits.
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Instruction sheet 521 721
Technical data
The high-voltage power supply 25 kV supplies a voltage which
is continuously adjustable up to 25 kV. This is not contact-hazardous, thanks to current limiting (max. short-circuit current
0.5 mA).
The positive and negative poles of the high voltage output are
potential-free. Thus the polarity of the output voltage can be
selected by connecting one or the other pole to ground.
Ground connection:
A built-in voltmeter displays the voltage in digital form. The output voltage can be set either using the knob or externally via a
signal at the control input.
Scope of supply
1 High voltage power supply 25 kV
1 Mains lead
Output voltage:
Maximum current:
Max. charging energy:
Discharge time
(output voltage zero
after switching off device):
approx. 0 to 25 kV (potentialfree)
electrically connected to PE
0.5 mA (short-circuit current)
200 mJ (immediately after switching off device)
max. 30 s
4-mm safety sockets
Internal voltmeter:
Measuring range:
digital, 3-digit
0-25 kV
class 3 (3 % of maximum value)
External control:
Replacing the primary fuse
Control voltage:
4 mm safety sockets,
bottom socket electrically connected to PE conductor
0-5 V DC
0-5 Vp, max. 1 Hz
Mains connection:
Mains voltage
Power consumption:
Primary protection device:
230 V or 115 V, 50-60 Hz
convertible at works
35 VA
T 0.315 for 230 V
T 0.63 for 115 V
General data:
20 cm × 21 cm × 24 cm
2,5 kg
To replace the primary fuse on the rear of the housing:
− Unplug the device from the mains.
− Pry out the fuse holder.
− Replace the blown fuse with a new fuse.
− Re-insert the fuse holder.
LEYBOLD DIDACTIC GMBH ⋅ Leyboldstrasse 1 ⋅ D-50354Hürth ⋅ Phone (02233) 604-0 ⋅ Telefax (02233) 604-222 ⋅ e-mail:
© by Leybold Didactic GmbH
Printed in the Federal Republic of Germany
Technical alterations reserved
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