Tabla de contenido
Idiomas disponibles
Idiomas disponibles
to the terminal panel with its 4-mm safety sock-
ets. A filament protection circuit is also integrated
into the neck brace to prevent excess voltage be-
ing applied to the cathode heater circuit and thus
protecting the sensitive heater filament from dam-
age. The relay cuts out at a filament voltage of
about 10.5 V DC or about 8.5 V AC. It switches
back on again when the filament voltage is once
again below the limit. Excess voltage is indicated
by a red LED. The base also contains a slot for
accommodating Helmholtz coils either trans-
versely to the tube and up to 150 mm away from
it
or
in
standard
(marked). The ramp at the front of the tube holder
accommodates the Helmholtz coils in an axial
configuration and also provides a base for the
auxiliary coil. The tube holder is mounted on
three rubber feet and is thus unable to slide.
Termi-
Tube
Function
nal
pin
A1
1
Anode
Cathode
F3
3
heater
Cathode
F4
4
heater
Depends on
C5
5
the tube e.g.
cathode
Depends on
G7
7
the tube e.g.
grid
3. Technical data
Dimensions:
130x190x250 mm
Weight:
0.570 kg approx.
Helmholtz
configuration
Comment
Connected
directly
Filament pro-
tection circuit
Filament pro-
tection circuit
connected to
C5 via a 400
kΩ resistor
Connected
directly and to
F4 via a 400
kΩ resistor
Connected
directly
3
approx.
4. Operation
4.1 Setting up and removing tubes
Press tube gently into the stock and push un-
til the pins are fully inserted. Take note of the
unique positions of the guide pin (refer to Fig.
1).
To remove the tube, apply pressure with the
index finger of the right hand on the guide pin
until the pins loosen, then pull out the tube.
4.2 Setting up the Helmholtz coils for a trans-
verse field
Insert the coils into the middle of the coil slot
and push them out as far as they go. Make
sure the connectors point outwards (refer to
Fig. 2).
Insert the hot cathode tube into the holder as
described above.
For Helmholtz configuration d = r the outer
edges of the coil base should be flush with
the dashed lines.
4.3 Setting up the Helmholtz coils for an axial
field
Insert the hot cathode tube into the holder as
described above.
Slot the base of the coil into the groove from
the front making sure that the connectors
point forwards.
When using both coils, attach the base of the
second coil to the plug of the first coil (refer to
Fig. 3a).
4.4 Setting up the auxiliary coil
Connect up the coil using experiment leads
(refer to Fig. 3b).
Place the coil onto the ramp of the tube holder
so that the plugs slide into the corresponding
slot.
The leads may be trailed through the mouth
of the ramp.
Insert the hot cathode tube into the holder as
described above.
2
Tabla de contenido
