User Manual

Figure 4- 6 Select modulation source
1)Internal source
In case of internal modulation source, modulation wave can be sine wave, square wave,
rising ramp wave, falling ramp wave, arbitrary wave and noise, and is sine wave by default.
After you use SUM function, you can see that modulation wave is sine wave by default.
You can change it with multi-functional knob on interface for using amplitude modulation
function or by pressing Param → ModWave
Square wave: duty ratio is 50%
Rising ramp wave: symmetry degree is 100%
Falling ramp wave: symmetry degree is 0%
Arbitrary wave: when selecting arbitrary wave as modulation waveform, function/arbitrary
waveform generator limits length of arbitrary wave to 4kpts by automatic test count.
Noise: white Gaussian noise
2)External source
In case of external modulation source, modulation wave and frequency will be hidden in
parameter list, when an external waveform will be used to modulate carrier waveform.
SUM depth is controlled by ±5V signal level on external analog modulation input terminal
(Modulation In connector) of back panel. For example, if modulation depth in parameter
list is set to be 100%, SUM output amplitude is the maximum when external modulation
signal is +5V and the minimum when external modulation signal is -5V.
Set frequency of modulation wave
The frequency of modulation wave can be set in case of internal modulation source. After
you use SUM function, you can see that default frequency of modulation wave is 100Hz.
You can change it with multi-functional knob and direction key on interface for using
amplitude modulation function or by pressing Param → ModFreq . The range of modulation
frequency is 2mHz~1MHz. In case of external modulation source, modulation wave and
frequency will be hidden in parameter list, when an external waveform will be used to
modulate carrier waveform. The frequency range of modulation signal of external input is
0Hz~20kHz.
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