B&K Precision 4040A - Manual - Manual (Page 9)

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17. BURST WIDTH Control. Adjusts the duty
cycle of the internal burst gate.
18. % MODULATION Control. Adjusts the
percentage of AM or FM modulation.
19 BURST OFF/ON Switch. Selects external or
internal burst gate. Continuous output is obtained
with switch in the OFF position and no external
burst gate is applied.
.
Figure 1. Model 4040A Front Panel.