B&K Precision 4010A - Manual - Manual (Page 12)

OPERATING INSTRUCTIONS______________________________________________________________________
DUTY CYCLE CONTROL
The DUTY CYCLE control can be used to alter the
symmetry of the output waveform, to produce waveshapes
such as those shown in Fig. 4. For a square wave, symmetry
variation amounts to changing the duty cycle (ratio of
"high" to "low" time), effectively converting the instrument
into a pulse generator. For a triangle wave, the result is a
ramp, and with a sine wave, a distorted waveshape called a
slewed sine is produced. The Model 4010A provides for
symmetry variation from 15% to 85%.
1. Select the waveform desired either SINE, SQUARE or
TRIANGLE.
2. Engage the DUTY CYCLE switch (14) and adjust the
DUTY CYCLE control (10) for the desired
waveshape. Clockwise rotation from center results in
an increase in square wave duty cycle, and changes the
sine and triangle waves as shown in the top waveform
of each pair of Fig. 4. Counter-clockwise rotation
results in the bottom waveform in each pair.
3. Varying the duty cycle setting results in a slight
change in frequency. Adjust the FREQUENCY
control as required.
Figure 4. Effects of Symmetry Variation.
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