3B Scientific Power Function Generator (115 V, 50__60 Hz) - Manual (Page 3)

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4.5 Sweep
• Press the Sweep button to activate sweep mode.
The initial frequency is shown on the top line of the
display, while the bottom shows the DC offset, the wave-
form and the word "START".
• Turn the frequency knob to set the desired initial
frequency as described in section 4.2.
• To set the frequency for when the sweep stops, press
the Sweep ´button again.
• The bottom line of the display will show the word
"STOP".
• Turn the frequency knob to set the desired fre-
quency for when the sweep stops.
Pressing the Sweep button again now sets the equip-
ment into sweep mode. The sub-modes External, Inter-
nal Continuous or Internal Single will be indicated on the
top line of the display.
• Turn the frequency knob to select the desired sub-
mode for the sweep function.
• Press Sweep again.
If external mode has been selected, then "EXT" will be
displayed at the bottom right of the display. If internal
mode was display, the word "TIME" will be displayed
there.
• Adjust the sweep time by turning the frequency
knob and press Sweep again.
The start frequency will be shown on the display and the
word "READY" will appear at the bottom right.
• Press Offset/Start/Stop to start the sweep.
While the sweep function is operating, the current fre-
quency will be indicated on the top line of the display,
while the bottom line shows the DC offset, the waveform
and the word "RUN". The sweep can be paused by hold-
ing down the Offset/Start/Stop button. Pressing it again
allows the sweep to continue. The word "BREAK" will be
displayed while it is paused.
• To exit sweep mode press Sweep again.
In order to modify the values, it is necessary to exit sweep
mode and initiate the procedure again. It should be
noted that the DC offset cannot be altered by this means.
5. Care and maintenance
• Before cleaning the equipment, disconnect it from
its power supply.
• Use a soft, damp cloth to clean it.
6. Disposal
• The packaging should be disposed of at local recy-
cling points.
• Should you need to dispose of the equipment itself,
never throw it away in normal domestic waste. Local
regulations for the disposal of electrical equipment
will apply.
7. Sample experiments
7.1 Demonstration of standing transverse waves on a
rubber rope and investigating the dependence of
their wavelength on the frequency and the ten-
sion
The following equipment is also required to perform the
experiment:
1 Accessories for rope waves 1008540 / U85560081
1 Dynamometer, 5 N 1003106 / U20034
1 Vibration generator 1000701 / U8556001
Experiment leads
• Set up the waves on a string accessory as in its man-
ual.
• Hang the dynamometer on the holder. If necessary,
first calibrate the zero point.
• Connect the function generator to the vibration
generator.
• Attach the rubber rope to the vibration generator,
pass it under the deflection device then upwards,
and hang it on the dynamometer. Ensure that it
runs as parallel as possible to the base plate.
• Apply tension to the rubber rope by moving the
dynamometer.
• On the function generator, select the “sine” wave-form.
• Adjust the frequency until 4 vibration loops are
obtained.
The wavelength is now half the length of the cord.
• Move the dynamometer higher up the rod until the
tension is four times the previous value.
The band now vibrates with just one peak and one trough.
The wavelength is therefore equal to the length of the band.
The following parameters are found to give good results:
Rope length (= distance from vibration generator to
deflection device): 60 cm, Frequency; approx. 44 Hz,
initial cord tension: 0.5 N
Rope length: 70 cm, Frequency; approx. 38 Hz, initial
cord tension: 0.5 N