3B SCIENTIFIC PHYSICS U21881 Foglio di istruzioni - Pagina 4

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5. Operation

5.1 General notes

Suitable voltage sources for operation of the halogen

lamp are, for example

Transformer 12 V, 60 W (230 V, 50/60 Hz) U19300-230

Transformer 12 V, 60 W (115 V, 50/60 Hz) U19300-115

•

Do not allow the lamp to suffer mechanical

shocks.

5.2 Producing a parallel light beam

•

Set up the optical lamp on the optical bench or

clamp it in a barrel foot and connect it to the

voltage source.

•

Set up the screen at the required distance from

the lamp.

•

Loosen the locking screw of the bulb movement

knob on the rear of the lamp.

Fig. 1 Rear side of the lamp: 1 fan, 2 locking screw, 3 bulb

movement knob, 4 sockets

•

Slide the bulb movement knob forward or

backward until a sharp image of the bulb filament

is obtained on the screen.

•

Re-tighten the locking screw.

•

To reduce the intensity of the light beam, attach

the hole diaphragm to the condenser lens using

the retaining ring.

5.3 Changing the bulb

Any deposits of fat from the skin on a halogen lamp

bulb cause the glass to become fogged and

significantly reduce the life of the bulb.

•

Do not touch the glass bulb of the halogen lamp

with fingers.

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •

•

Fig. 2 Changing the bulb: 1 securing screws, 2 lid of the

casing, 3 socket

5.4 Setting up on the optical bench

•

Fig. 3 Setting up on the optical bench

Subject to technical amendment

Remove the four securing screws and remove the

lid of the casing.

Take out the defective halogen bulb.

Holding the 12 V, 50 W replacement bulb

(U13735) with a cloth or other protective material,

push the connecting wires into the socket.

Screw the lid back on.

Screw the handling rod into the base of the

optical lamp.

Fix the optical lamp into the rider on the optical

bench.