B&K Precision 4045B - Manual - Manual (Page 39)

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F1: Deviation - Defines the FM deviation frequency.
F2: Frequency - Selects the modulation frequency,
from 0.1 Hz to 20.00 kHz.
F3: Shape - Selects the shape of the modulating
waveform between Sine, Triangle, or Square.
F4: External - Selects and enables the external
modulation by an external signal applied to the
Modulation In connector in the rear panel.
3.6.6 ARBITRARY Key
Selects the Arbitrary waveform menu shown
below:
Arbitrary Menu