3B Scientific DC Power Supply for Torsion Pendulum (115 V, 50__60 Hz) - Manual (Page 3)

3
Instruction sheet
3B SCIENTIFIC® PHYSICS ®
The power supply unit is designed to provide the tor-
sion pendulum according to Prof. Pohl (U15040) with
the DC voltage required for the electromotor and eddy-
current brake.
1. Safety instructions
• Before being put into operation the device (hous-
ing, connection cable, operating and display ele-
ments) must be examined for damage.
• Be sure to disconnect the mains plug before chang-
ing fuses or opening the housing.
• Make sure that there is no obstruction to the air
circulation around the cooling attachment at the
rear of the power supply unit.
• During the supply of high currents over a prolonged
period of time the cooling attachment of the power
supply unit becomes hot.
• Repair and maintenance may only be carried out
by authorised technicians.
• If the device has clearly experienced visible dam-
age or there is the suspicion that the device can no
longer be operated safely, please refrain from op-
erating the device and make sure that the device is
safeguarded against unintended use.
U11755 DC Power Supply for Torsion Pendulum
11/03 ALF
2. Description, technical data
The DC power supply for the torsion pendulum is de-
signed in accordance with the safety stipulations set
forth in DIN EN 61010 Part 1 and protection class I.
This unit is equipped with two outputs for a continu-
ously adjustable stabilized DC voltage 0 – 24 V and an
electrically isolated fixed voltage of 24 V DC. The vari-
able voltage can be read from an analog display.
There are two versions of the power supply available:
U11755–115 for mains voltage of 115V 50/60 Hz
U11755–230 for mains voltage of 230V 50/60 Hz
Mains connection: 115 V or 230 V 50/60 Hz
Power consumption: 120 VA
Fuse: M 1,4 A
Output voltages: 24 V DC, 1 A (fixed)
0 up to 24 V DC, 2 A
(continuously adjustable)
Stability under full load:
≤ 30 mV
Residual ripple:
≤ 2 mV
rms
Terminals: each with 4-mm
safety sockets
Dimensions: 200 mm x 210 mm x 230 mm
Ground: 3.7 kg
1 Fixed voltage output 24 V
2 Control light for output 24 V
3 Mains switch with operating indicator light
4 Control knob for output 0 – 24 V
5 Display for output 0 – 24 V
6 Output 0 – 24 V
7 Mains cable
8 Cooling attachment
9 Fuse holder
1
2
7
8
9
M 1,4 A
24 V/1 A
0...24 V 0...24 V
U11755
4 3 5 6