3B Scientific DC Power Supply 0-500 V (230 V, 50__60 Hz) - Manual (Page 2)

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• 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 com-
ponents of the equipment.
• The equipment may only be opened/repaired by
qualified and trained personnel.
The 500 V output can be dangerous to touch.
• Switch off the equipment to start with while the
experiment is set up.
• Any changes to the circuit may only be made
with the equipment switched off.
2. Description
The 0 – 500 V DC power supply provides four inde-
pendently adjustable DC voltages, and is especially
intended for operating electron tubes, including
Helmholtz coils.
The DC voltages are stabilised and regulated, floating
and galvanically isolated from one another, short
circuit proof and secure from external voltages The
output voltages are shown by four analogue displays.
The DC power supply 1003307 is for operation with a
mains voltage of 115 V (±10%), and the unit 1003308
is for operation with a mains voltage of 230 V
(±10%).
3. Technical data
500 V output:
Voltage:
0 - 500 V DC, max. 50 mA
Stability at full load: ≤ 0.01 % ± 100 mV
Residual ripple: ≤ 20 mV
50 V output:
Voltage:
0 - 50 V DC, max. 50 mA
Stability at full load: ≤ 0.1 % ± 30 mV
Residual ripple: ≤ 5 mV
8 V output:
Voltage:
0 - 8 V DC, max. 3 A
Stability at full load: ≤ 0.1 % ± 30 mV
12 V output:
Voltage:
0 - 12 V DC, max. 4 A
Stability at full load: ≤ 0.1 % ± 30 mV
Mains voltage: see rear of housing
Primary fuse: see rear of housing
Displays: analogue, class 2
Terminals: 4 mm safety sockets
Power consumption: 50 VA
Dimensions: 85x325x190 mm 3 approx.
Weight: 4 kg approx.
4. Operation
4.1 General information
• Before switching on the DC power supply, set all four
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 required voltages.
• Before switching off the DC power supply, set the
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 elec-
trical equipment will apply.
7. Examples of use
The 0 – 500 V DC power supply is especially suitable
for use as a voltage source with the following tubes:
1. Fine beam tube 1000904
2. Training oscilloscope 1000902
3. Dual pole tube 1008521
4. Electron tubes in the S and D tube ranges