Anritsu MG3641A User Manual
SECTION 4 OPERATING INSTRUCTIONS
4-18
4.6
Setting the Modulation
4.6.1
Outline of Modulation
This signal generator provides AM and FM modulation functions. The FM modulation has two systems: FM1 and
FM2, frequency deviation of which can be set independently of each other.
This unit also comes with 5 different modulation signal sources, as shown below, and you can select any one of
them for each type of modulation.
Internal modulation
: Int1 ........ Sine wave of 1 kHz or 400 Hz
Int2 ........ 0.01 Hz to 400 kHz digital synthesizer
Int3 ........ 0.01 Hz to 400 kHz digital synthesizer
External modulation : Ext1 ....... Signal supplied to the Mod Input Ext1 connector
Ext2 ....... Signal supplied to the Mod Input Ext2 connector
The flow of modulation signals is graphically presented below:
Ext1
Int1
Ext2
AF Output
Int2
Int3
Ext1
Ext2
+ −
+ −
+ −
Mod Input
Modulation Source Selection Matrix
1 kHz/400 Hz
sine-wave
oscillator
Internal
modulation source
2
(Option)
Internal
modulation source
3
(Option)
Polarity
switching
Polarity
switching
Polarity
switching
FM1 frequency
deviation setting
FM2 frequency
deviation setting
AM modulation
factor setting
Σ
AF output level setting
FM modulator
AM modulator
Flow of Modulation Signals