Anritsu MG3641A - Manual (Page 64)

SECTION 4 OPERATING INSTRUCTIONS
4.7 Setting the Modulation Signal Source
4.7.1 Internal Modulation Signal (Int1)
Int1 is a signal source that generates sine waves at a frequency of either 1 kHz or 400 Hz.
To select a frequency for Int1, follow the procedure detailed below:
(1) Press the "Src" [F4] key in the Modulation Menu to
open the "Audio Source" menu.
(2) Select frequency display for Int1 by operating the "
↓"
[F2], and "
↑" [F3], "→" [F4], keys (the characters are
highlighted).
(3) Press the "Sel" [F1] key to select 400 Hz or 1 kHz.
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