B&K Precision 4040A - Manual - Manual (Page 14)

14
OPERATING INSTRUCTIONS
Figure 5. Tone burst generator output
waveform.
3. Varying the duty cycle setting results in a slight change in
frequency. Adjust the COARSE and FINE frequency controls
as required.
BURST OPERATION
In gated burst mode of operation, the generator output is switched
on and off (gated), either by an internally generated signal or by an
externally applied signal. Both the repetition rate and the duty cycle
are variable. Fig. 5 illustrates the type of waveform generated and
summarizes the control settings used to obtain the desired waveform.
Internal Triggering
1. Select the waveform to be gated by pushing in the appropriate
FUNCTION switch. Display the output of the generator on an
oscilloscope.
2. Adjust the frequency, amplitude, symmetry, and dc offset of the
signal by using the main generator controls.
3. Enable the burst mode by pushing in the BURST ON switch.
4. Set the repetition rate of the burst with the SWEEP TIME
control.
5. Adjust the tone burst duty cycle, or adjust the tone burst width
to a specific time period, with the BURST WIDTH control.
External Triggering
1. Select the waveform to be gated by pushing in the appropriate
FUNCTION switch on the front panel.
2. Adjust the frequency, amplitude, symmetry, and dc offset of the
signal by using the main generator controls.