General Information; Changing The Fuse - 3B SCIENTIFIC PHYSICS U33020 Instrucciones De Uso

2. Description
The 0 – 20 V, 0 – 5 A DC power supply provides a
DC voltage up to 20 V and a DC current up to 5 A.
The output voltage and output current are con-
tinuously variable. The unit can be used either as a
constant voltage source with current limitation or
as a constant current source with voltage limita-
tion. When the cv LED is illuminated it shows that
the unit is operating as a constant voltage source,
whereas the cc LED shows that it is operating as a
constant current source. The output is protected
against short-circuiting.
The U33020-115 DC power supply is for operation
with a mains voltage of 115 V (±10%), and the
U33020-230 unit is for operation with a mains
voltage of 230 V (±10%).
3. Technical data
Mains voltage:
DC output:
Output power:
Stability under full load:
Residual ripple:
Displays:
Primary fuse:
Terminals:
Dimensions:
Weight:
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •
see rear of housing
0 – 20 V, 0 – 5 A
100 W
≤
0,01% + 5 mV,
≤
0,2% + 5 mA
≤
1 mV, 3 mA
2 x 3 digit LED
see rear of housing
4 mm safety sockets
3
130x150x300 mm ap-
prox.
4.7 kg approx.
Subject to technical amendments
© Copyright 2008 3B Scientific GmbH
4. Operation

4.1 General information

•
Before switching on the power supply, set the
current and 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 current regulator to give the required
current.
•
Set the coarse and fine voltage regulators to
give the required voltage.
•
Before switching off the power supply, set the
current and 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.
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