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3B SCIENTIFIC

Instruction manual

06/09 Hh

1. Safety instructions

When in operation, the ultrasonic motion sensor

customarily generates individually audible packets of

pulses (bursts) which repeat with variable frequency.

When operated in this way the equipment is guaran-

teed to be safe.

•

In the case of a fault (visible damage to the

equipment, unusual sounding bursts) the

equipment should immediately be turned off.

2. Scope of delivery

1 Ultrasonic motion sensor U11361

1 Stand rod, 120 mm long

1 Stand rod, 60 mm long

1 miniDIN 8-pin connector lead, 1 m long

1 Instruction manual for U11361

PHYSICS

Ultrasonic Motion Sensor U11361

3. Description

Sensor box for measuring movements in one dimen-

sion e.g. on an air track or in free fall.

For use in conjunction with a 3B NETlog

unit for making manual measurements or connected

to a computer running 3B NETlab

acquisition of measured data.

The sensor is detected automatically by the 3B NET-

log

unit.

4. Function

The motion sensor utilises a gold-foil ultrasonic trans-

ducer and transmits packets consisting of 16 ultra-

sonic pulses (bursts). The ultrasonic sensor will detect

the echo of such signals from a (moving) object ("tar-

get") after a minimal acoustic lag of about 1 ms –

corresponding to a distance to the object of about 15

cm. The exact distance to the object is calculated from

the time between the transmission of a signal and

detection of its echo, along with the speed of sound in

air, which is temperature dependent. For larger dis-

tances between sensor and object, the ultrasonic

transducer automatically adapts the repeat frequency

so that it is about 40 Hz for short distances and ap-

proximately 5 Hz for distances up to 10 m.

(U11300)

(U11310) for