TEXIO FGX-2220, Instruction Manual

Page: 61 / 229

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4-2-7. Selecting (FM) Modulation Source
The function generator will accept an internal or external source for FM modulation.
The default source is internal.
Panel Operation 1.
Press the MOD key.
MOD
2.
Press F2 (FM).
FM F2
3.
Press F1 (Source).
Source F1
4.
To select the source, press F1
(Internal) or F2 (External).
INT
F1
~
EXT
F2
5.
Press Return to return to the
previous menu.
Return
External Source Use the MOD INPUT terminal on the
rear panel when using an external
source.
IN
OUT
Trigger
Counter Trigger
MOD
Note If an external modulating source is selected, the
frequency deviation is limited to the ± 5V MOD INPUT
terminal on the rear panel. The frequency deviation is
proportional to the signal level of the modulation in
voltage. For example, if the modulation in voltage is +5V,
then the frequency deviation would be equal to the set
frequency deviation. Lower signal levels reduce the
frequency deviation while negative voltage levels
produce frequency deviations with frequencies below the
carrier waveform.