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Auxilab QLL014 Manual De Instrucciones página 8

Generador de van de graaff

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Working procedure
1. Adjust the hollow metal globe on the cylindrical acrylic pipe, as
shown in the picture
2. Connect the earthing socket for discharger to the earthing socket
of power supply unit using the connecting lead provided.
3. Plug-in the power cord in the mains in let of the apparatus and
connect to the 220 V AC
4. Switch on the mains switch.
5. Motor inside the apparatus, will start rotating the nylon belt.
6. As the belt will start rotating it passes in front of the lower brush,
it receives negative charge chat escapes from its points due to the
influence of the electric field around the lower roller which ionizes
the air at the points.
7. As the belt touches the lower roller, it transfers some electrons,
leaving the roller with a negative charge, which added to the
negative charge in the belt generates enough electric field to ionize
the air at the points of the upper brush.
Manual de instrucciones- Instruction manual
QLL014
8. Electrons then leak from the belt to the upper brush and to the
terminal, leaving the belt positively charged as it returns down and
the terminal negatively charged.
9. The hollow metal globe shields the upper roller and brush from the
electric field generated by charges that accumulate at the outer
surface of it, causing the discharge and change of polarity of the
belt at the upper roller to our practically.
10. As the belt continues to move, a constant charging current travels
via the belt, and the sphere continues to accumulate negative
charge until the rate that charge is being los equals the charging
current. The larger the sphere and the farther it is from ground, the
higher will be its final potential.
Wiring diagram and PCB circuit connections
Versión-Version 1/2017
8

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