3B SCIENTIFIC PHYSICS 1000738 Руководство - Страница 4

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3B SCIENTIFIC PHYSICS 1000738 Руководство

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 instrument is ready for operation.

Fig. 1 Setting up the stand rod

5. Operation

The following equipment is also required to per-

form the experiment:

1 Digital counter/timer@230 V

1 Digital counter/timer@115 V

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.

3B Scientific GmbH ▪ Ludwig-Erhard-Str. 20 ▪ 20459 Hamburg ▪ Germany ▪ www.3bscientific.com

20 to 960 mm

Mechanical

Electronic

200 x 130 x 730 mm

1001033

1001032

1002848

Subject to technical amendments

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 cov-

ered, 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 retaining 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 sur-

face of the ball. The start contact opens at the

instant the ball begins to fall.

When the ball hits the contact plate at the bot-

tom, the stop contact is opened briefly and the

time measurement is stopped.

Fig.2 Adjusting the height of fall