3B SCIENTIFIC PHYSICS U52003 Mode D'emploi page 4

4. Additionally required equipment
1 Function generator, 130 kHz (230 V, 50/60 Hz)
or
1 Function generator, 130 kHz (115 V, 50/60 Hz)
1 Analog oscilloscope, 2x30 MHz
3 Stand bases, 0.5 kg
2 HF cables, BNC/4-mm plugs
2 Adapters, BNC/4-mm safety sockets
5. Operation
5.1 Calibration of resonant frequency
•
Set up the ultrasonic transmitter and receiver
close together and facing one another.
Connect the transmitter to the 50 Ω/600 Ω output
•
of the function generator and set the frequency to
40 kHz.
U21010
U21010
Fig. 2 Experiment set-up for the reflection of ultrasonic waves by a projection screen
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •
U21010-230
U21010-115
U11175
U8611210
U11257
U13807
S
Fig. 1 Experiment set-up for calibrating resonant frequency
S
R
Subject to technical amendments
© Copyright 2010 3B Scientific GmbH
•
Connect the receiver to an oscilloscope.
•
Observe the received signal and make fine
adjustments to the frequency to maximise the
signal amplitude.
5.2 Example
•
Set up the ultrasonic transmitter and receiver
alongside one another in front of the projection
screen.
Connect the transmitter to the 50 Ω/600 Ω output
•
of the function generator and set the frequency to
the resonant frequency (see 5.1).
•
Connect the receiver to the 30-W amplifier in the
function generator.
•
Connect the output of the amplifier to the
oscilloscope.
•
Move the projection screen and observe the phase
differences between the signals.
R
U11175
U11175
www.3bscientific.com