B&K Precision 4040B - Manual - Manual (Page 35)

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F1: % - Defines the modulation depth (from 0 to 100%)
F2: Frequency - Selects the modulation frequency, from
0.1 Hz to 20.00 kHz.
F3: Shape - Selects the modulating waveform between
Sine, Square, or Triangle. For model 4014B, only Sine is
available.
F4: External - Selects and enables the external
modulation by an external signal applied to the
Modulation In connector in the rear panel.
Press F3 to select FM menu:
FM Menu