3B SCIENTIFIC PHYSICS ELWE U8400830 Anleitungsblatt - Seite 4

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1. Instruction Sheet

2. Contents

1 Base plate

1 Stand rod

1 Start fitting

3 Steel balls, 16 mm dia.

1 Allen key

3. Technical data

Range of heights

Switch contacts:

Start:

Stop:

Dimensions:

4. Set-up

•

Insert the stand rod into the socket in the base

plate as far as it will go, and turn it so that the

scale faces towards the red contact plate.

•

Tighten the fixing screw using the Allen key

provided.

If the stand rod has been set up correctly, the scale

will be exactly at the correct height and the in-

strument is ready for operation.

Fig. 1 Setting up the stand rod

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany •

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

20 to 960 mm

Mechanical

Electronic

200 x 130 x 730 mm

Subject to technical amendments

5. Operation

The following equipment is also required to per-

form the experiment:

1 Digital counter/timer

1 Set of experiment leads

•

Connect the free-fall apparatus to a timer.

Make sure you keep to the colour coding of the

sockets.

•

Set the release lever and adjust the height of

fall.

The height of fall can be read off the scale on the

rod and is referenced to the top edge of the bore

on the start fitting (see Fig. 2). The reading on the

scale corresponds to the distance covered, i.e. the

distance between the ball and the contact plate at

the bottom.

•

Place the steel ball between the contact pins

from below so that it is held in place by the re-

taining lug when the latter is pressed down.

•

Allow the ball to fall by pushing lightly on the

release lever.

For optimum precision and reproducibility, the

release must be operated gently and carefully.

The micro-magnet moves away from the surface of

the ball. The start contact opens at the instant the

ball begins to fall.

When the ball hits the contact plate at the bottom,

the stop contact is opened briefly and the time

measurement is stopped.

Fig.2

Adjusting the height of fall

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U8533341

U13811