3B SCIENTIFIC PHYSICS 1001011 User manual

3B SCIENTIFIC®PHYSICS
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Tube power supply unit 0–300 V @115 V 1001011
Tube power supply unit 0–300 V @230 V 1001012
Instruction sheet
06/15 ALF
1 Main ON/OFF switch
2 Voltage regulator 0-300 V
3 Current limit regulator 0-200 mA
4 Operation indicator for current limit
5 Output sockets 0-300 V (constant, linear rise/fall)
6 Common ground
7 Voltage regulator 0-50 V
8 Output sockets 0-50 V
9 Voltage regulator 4-12 V
10 Output sockets 4-12 V
11 PE socket
12 Sockets for timer
13 Regulator for rate of voltage drop
14 Rotary switch for increasing, maintaining or
reducing output voltage
15 Regulator for rate of voltage rise
16 ON/OFF switch for ramp generator

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1. Safety instructions
The tube power supply unit conforms to safety
regulations for electrical measuring, control,
monitoring and laboratory equipment, as speci-
fied under DIN EN 61010, section 1, and is de-
signed to be classified as protection class I
equipment. It is intended for operation in a dry
environment suitable for the operation of electri-
cal 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 equipment should be switched off
immediately and secured against any unintend-
ed 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 immedi-
ately and secure it against any unintentional
use.
The instrument may only be connected to
the mains via a socket that has an earth
connection.
Never cover the air vents at the rear of the
housing. They are necessary in order to en-
sure 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
making any modifications to the circuit. Only
switch on the equipment when the experi-
mental 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
effectively for conducting experiments on the
law of induction and on charging and discharg-
ing of capacitors.
The power supply unit is capable of supplying
voltage in the following ranges:
1. Stabilised DC (0-300 V) for acceleration volt-
age 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 volt-
age 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 electronic voltage stabilisation system as well
as a current limiter. In the event of a thermal
overload, the tube power supply unit is automat-
ically disconnected from the mains power supply
and is automatically reactivated when the per-
missible temperature 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 con-
nected equipment (timer, oscilloscope, x-t plot-
ter, etc.)
The tube power supply unit 1001011 is for oper-
ation with a mains voltage of 115 V (±10%), and
the 1001012 unit is for operation with a mains
voltage of 230 V (±10%).

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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 mVrms
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 mm3
Weight: 3.7 kg approx.
4. Operation
Connect the equipment via the mains lead to
the mains power supply. Switch on the
green ON/OFF button. The equipment is
immediately ready for use.
Select the desired voltage from the available
voltage ranges depicted on the front panel.
In order to operate the ramp generator,
switch on the ON/OFF switch for the ramp
generator and set the rotary switch to
“STOP”.
Use the voltage regulator (0-300 V) to set
the final value of the voltage ramp.
Set the desired ramp using the rotary switch.
If the rotary switch is turned to the left from
the STOP position, the voltage at the output
connectors of the DC 0…300 V voltage field
increases linearly from 0 to the set final value
of the ramp voltage. If the rotary switch is
turned to the right from the STOP position, the
voltage decreases from the set final value to
0. It is possible to halt at an intermediate val-
ue by switching back quickly to “STOP”. After
this, you can continue the process of either
increasing or decreasing the voltage from/to
0 V by turning the rotary switch accordingly.
5. Storage, cleaning and disposal
Keep the equipment in a clean, dry and
dust-free place.
Before cleaning the equipment, disconnect it
from its power supply.
Do not clean the unit with volatile solvents or
abrasive cleaners.
Use a soft, damp cloth to clean it.
The packaging should be disposed of at
local recycling points.
Should you need to
dispose of the equip-
ment itself, never throw
it away in normal do-
mestic waste. Local
regulations for the dis-
posal of electrical
equipment will apply.

3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com
Technical amendments are possible
© Copyright 2015 3B Scientific GmbH
6. Sample experiments
ı
O
On
Off
APE
PE
0...300 V 6...12 V 0...-50 V
HC W
Fig. 1: Experimental set-up for filament tube
ı
O
On
Off
Fig. 2: Experimental set-up for plate capacitor