PASCO WA-9611_13 SONOMETER - Manual (Page 17)

13
012-03489E Sonometer
EQUIPMENT NEEDED:
– WA-9611 Sonometer – WA-9613 Driver/Detector Coils
– Function generator capable of delivering 0.5 amp – Dual trace oscilloscope
– Mass and mass hanger
Procedure
➀ Set up the Sonometer as shown in Figure 2.1.
Set the bridges 60 cm apart. Use any of the included strings and hang a mass of approximately 1
kg from the tensioning lever. Adjust the string adjustment knob so that the tensioning lever is
horizontal. Position the driver coil approximately 5 cm from one of the bridges and position the
detector near the center of the wire.
➁ Set the signal generator to produce a sine wave and set the gain of the oscilloscope to approxi-
mately 5 mV/cm.
➂ Slowly increase the frequency of the signal driving the driver coil, starting with a frequency of
around 1 Hz. Determine the lowest frequency at which resonance occurs. Record this value in
Table 2.1.
➤ NOTE: To be sure you have found the lowest resonant frequency, slide the detector coil the
length of the string. The wave pattern should have just a single antinode located midway be-
tween the two bridges.
Experiment 2: Velocity of Wave Propagation
Figure 2.1 Equipment Setup
WA-9611
SONOMETER
KEEP WEIGHTS AS NEAR TO FLOOR AS POSSIBLE IN THE EVENT THE
SONOMETER WIRE SHOULD BREAK
CAUTION! 1.75 kg MAXIMUM
LOAD ON LEVER
BK PRECISION 200 Mhz OSCILLISCOPE
MODEL
2120
INTENSITY FOCUS
TRACE NOTATION
TRIG LEVEL
COUPLE SOURCE
SLOPE λ - Y
TIME/DI
V
X-POS
VAR VAR
VAR SWEEP
CAL CAL mV V
CH 1
VOLTZ/DIV CH 2
VOLTZ/DIV
CAL mV V
VERTICAL MODE
PULL XS PULL XS
CH 2
∞
CH 1 ∞
AC
DC
AC
DC
AC CH1
CH2
ALT
EXT
POS POS NORM
EXT CH1
CH2 NORM
EXT CH1
CH2
MANUAL AUTO
T X-
Y
T X-
Y
LINE
CAL EXT CH4
POWER 200V
MAX 400V
MAX 400V
MAX
- +
+
-
T T
L
H I Ω
G
N D
L O Ω M I N
R A N G E
A D J U S T
M A X
O U T P
U T
F R E Q U E N
C Y
A M P L I T U
D E
P I - 9 5 8 7 B
D I G I TA L F U N C T I O N
G E N E R AT O R -
A M P L I F I E R
H E R T Z
WAV E F O
R M
I N P U T G N D
E X T E R N A L
DETECTOR
WA-9613
DRIVER
WA-9613