3B SCIENTIFIC PHYSICS 1000762 Інструкція з експлуатації - Сторінка 5

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markings.

Between these two markings, a Hall

sensor is built into the bearing rod. It is aligned in

such a way that field lines run in the direction of

the chip when the pendulum is at rest, meaning

that there is then no Hall effect detectable. An

electronic module for sensing angle is screwed

onto the bearing rod. This transducer detects the

angle of deflection of the pendulum and converts

it into an electric signal which is proportional to

that angle. If the pendulum is deflected from the

vertical by an angle , a horizontal field compo-

nent arises, which results in a positive or negative

output voltage depending on the direction.

A disc-shaped weight serves as the pendulum

bob.

Power is provided via a 12-V AC plug-in supply

which is included with the apparatus.

Rod pendulum

1000762 is designed for a mains

voltage of 115 V (±10%), while 1000763 is de-

signed for 230 V (±10%).

Note: The angle sensor is matched to the pair of

magnets of the needle bearing such that the out-

put voltage from the BNC socket is approximately

zero in the rest position. Fine adjustment can be

carried out using the offset adjustment knob. The

arrangement of the needle bearing and the angle

sensor is indicated by a number on the housings.

If equipment with differing numbers is used, it may

be that high offset voltages occur due to the scat-

tering that results from the specific properties of

the magnets.

3. Contents

Pendulum rod with U-shaped bracket and nee-

dle bearings

1 Pendulum bob

1 Bearing rod with V-shaped groove and angle

sensor attached

1 Plug-in power supply, 12 V AC

4. Technical data

Operating voltage:

Output voltage:

Output resistance:

Maximum length of pendulum: 1 m

Mass of pendulum bob:

Weight of angle sensor:

Bearing rod:

12 V AC

±5 V

500 ohms

1 kg

0.3 kg approx.

10 mm diam.

5. Operation

The following additional equipment is required to

set up the rod pendulum in order to carry out ex-

periments:

For set-up:

1 Bench clamp

1 Stand rod, 1000 mm

1 Universal clamp

For measurement:

1 Computer

1 PC Oscilloscope 2x25 MHz

1 HF patch cord

1 Voltage Sensor 10 V

1 Adapter, BNC Plug/4 mm Jacks

1 Data logger

1 Software

More information about digital measurement can

be found on the product's webpage in the 3B

Webshop.

5.1 Set-up for rod pendulum



To set up the rod pendulum, attach the stand

rod to the bench in an upright position by

means of the bench clamp.



Attach the bearing rod to the stand rod at a

suitable height by means of the universal

clamp.



Insert the needle bearings for the pendulum

into their intended positions (marked by cir-

cles).



If the bearing rod is not horizontal, then level

it with the help of the adjusting screws.



Move the pendulum bob along the rod to set

up the effective length of the pendulum L and

secure the bob with the knurled screw.



Plug in the power supply to connect the angle

sensor to the mains and connect it to the os-

cilloscope via the BNC socket and the patch

cord or to the data logger by means of the

adapter and the voltage sensor.

5.2 Setting offset



Turn on the oscilloscope or the data logger.



If a value other than zero is read when the

pendulum is in its rest position, you can use

the offset adjustment knob to compensate.

1002832

1002936

1002830

1020857

1002746

1021682

1002750