PeakTech 4105 Bedienungsanleitung Seite 105

5.7 Sum Modulation
In Sum Modulation (Sum), the modulating signal is added to the carrier waveform. Press 【Modulate】
key then select the SUM using the 〖Mod Type〗softkey. The Sum waveform is output using the
present settings.
5.7.1 Set Carrier
Firstly, set the shape, frequency, amplitude and offset of Carrier Waveform. In Sum, the
instantaneous voltage of output waveforms equals to sum voltage of carrier waveform and
modulating waveform. You can select one of most waveforms from above table to be carrier, but
some waveforms are not available.
5.7.2 Sum Amplitude
After selecting Sum, press the Sum Ampl softkey. Then use the knob or numeric keypad to enter the
desired amplitude. The sum amplitude represents the amplitude of the signal added to the carrier (in
percent of carrier amplitude). When sum amplitude at 100%, amplitude of modulating waveform is a
half of amplitude of carrier waveform. When sum amplitude at 0%, amplitude of modulating waveform
is 0, then amplitude if carrier waveform will be half of setting value for carrier waveform.
5.7.3 Modulating Waveform Frequency
Press 〖Sum Freq〗softkey then set the desired value using knob or keypad. Different from other
modulating mode, the modulating frequency can be highly greater than carrier frequency.
5.7.4 Modulating Waveform Shape
Press 〖Shape〗 softkey then select 'Shape' to enter the desired wave. Press 【Waveform】 key, then
select most waveforms from above table as modulating waveform, but some waveforms are not
available. Finally, return to Sum menu.
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