3B SCIENTIFIC
®
PHYSICS
1
AC/DC Power Supply, 12 V, 3A (115 V, 50/60 Hz)
AC/DC Power Supply, 12 V, 3A (230 V, 50/60 Hz)
1002775 (115 V, 50/60 Hz)
1002776 (230 V, 50/60 Hz)
Instruction sheet
04/12 ALF
1 On/off switch
2 DC voltage adjustment
knob
3 DC voltage display
4 DC output
5 AC constant voltage
outputs
6 Fuse box (back of appa-
ratus)
1. Safety instructions
The 12 V/3 A AC/DC power supply unit con-
forms to all safety regulations for electrical
measuring, control, monitoring and laboratory
equipment, as specified under DIN EN 61010,
Section 1, and the equipment has been de-
signed to meet protection class I. It is intended
for operation in a dry environment, suitable for
the operation of electrical equipment and sys-
tems.
Safe operation of the equipment is guaranteed,
provided it is used correctly. However, there is
no guarantee of safety if the equipment is used
in an improper 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 AC/DC power supply unit must
be supervised by qualified personnel.
Caution: the low-voltage outputs of the power
supply are not surge-proof if exposed to external
voltages of more than 100 V with respect to earth.
•
When using the equipment in conjunction
with other power supplies, e.g. for operating
electron tubes, be careful that no voltages in
excess of 100 V with respect to earth are
present at the outputs.
•
Before using the AC/DC power supply unit
for the first time, confirm that the specifica-
tions printed on the rear side of the housing
are compatible with the local mains voltage.
•
Before using the AC/DC power supply unit
for the first time, check the housing and the
mains lead for any damage. In the event of
any malfunction/operational defect or visible
damage, switch off the unit immediately and
secure it against unintended use.
•
The instrument may only be connected to
the mains via a socket that has an earth
connection.
