3B Scientific DC Power Supply 0 - 300 V (230 V, 50__60 Hz) User Manual
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1. Safety instructions
The tube power supply unit conforms to safety
regulations for electrical measuring, control, moni-
toring and laboratory equipment, as specified
under DIN EN 61010, section 1, and is designed to
be classified as protection class I equipment. It is
intended for operation in a dry environment suit-
able for the operation of electrical equipment and
systems.
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 is deemed that
the equipment can no longer be operated without
risk (e.g. visible damage has occurred), the equip-
ment 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.
•
Before putting the equipment into operation,
confirm it is compatible with the local mains
voltage.
•
Before setting starting any experiments, check
the basic unit for any damage. In the event of
any malfunction/defect or visible damage,
switch off the equipment immediately and se-
cure it against any unintentional use.
•
The instrument may only be connected to the
mains via a socket that has an earth connec-
tion.
•
Never cover the air vents at the rear of the
housing. They are necessary in order to ensure
sufficient circulation of air required for cooling
the internal components of the equipment.
•
The equipment may only be opened/repaired
by qualified and trained personnel.
Warning: The equipment supplies DC voltages in
excess of 60 V that are hazardous to come into
contact with.
•
Always, switch off the equipment before mak-
ing any modifications to the circuit. Only
switch on the equipment when the experimen-
tal set-up is complete.
•
Use only safety experiment leads for making
connections.
•
Never touch or make direct contact with any
connected or exposed leads, or the plates of a
connected plate capacitor.
2. Description
The tube power supply unit is primarily designed
for operating cathode ray tubes (e.g. a narrow-
beam tube or oscilloscope demonstration set). In
addition, the equipment can be used very effec-
tively for conducting experiments on the law of
induction and on charging and discharging of ca-
pacitors.
The power supply unit is capable of supplying volt-
age in the following ranges:
1. Stabilised DC (0-300 V) for acceleration voltage in
cathode ray tubes
2. Stabilised DC voltage (0-50 V) for grid (Wehnelt)
voltage in cathode ray tubes
3. Stabilised DC voltage (4-12 V) for heater voltage
in cathode ray tubes
4. Stabilised, linearly rising or falling voltage for
quantitative analysis of induction processes with
coreless coils and for charging and discharging of
capacitors
All voltage sources are floating and proof against
short circuits and all are equipped with an elec-
tronic voltage stabilisation system as well as a cur-
rent limiter. In the event of a thermal overload, the
tube power supply unit is automatically discon-
nected from the mains power supply and is auto-
matically reactivated when the permissible tem-
perature range has been attained.
The two sockets marked “Timer” are equipped with
an internal relay, which is closed when a rising or
falling ramp is activated and is used for switching
on/switching off any additionally connected
equipment (timer, oscilloscope, x-t plotter, etc.)
The tube power supply unit U8521371-115 is for
operation with a mains voltage of 115 V (±10%),
and the U8521371-230 unit is for operation with a
mains voltage of 230 V (±10%).
3. Technical data
Output voltage:
4-15 V DC, 400 mA
0-50 V DC, 10 mA
0-300 V DC, 0-200 mA
0-350 V DC*, 0-10 mA
*with common ground
Ramp generator:
linear ly rising or falling
values, 2.5-50 V/s,
0-300 V
Ripple voltage at
full load:
10 mV
rms
Voltage stability:
at 10% mains voltage:
< 0.2%
between no-load opera-
tion and full load:
< 0.5%
Power consumption:
75 VA
Timer relay:
50 V, 150 mA
Mains voltage:
See rear
Dimensions:
240 x 230 x 170 mm
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Weight:
3.7 kg approx.