User Manual

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5.3.3 Modulating Waveform Frequency
After selecting FM, press 〖FM Freq〗softkey then enter the desired value. Generally speaking,
modulating waveform frequency is always less than the carrier frequency.
5.3.4 Modulating Waveform Shape
Press 〖Shape〗softkey then select ‘Shape’ to enter the desired value. Press 【Waveform】 key, then
select one of most waveforms in above table as modulating waveform. Finally, return to FM menu.
5.3.5 Modulating Source
The waveform generator will accept an internal or external modulation source for FM. Press 〖Source
Int/Ext〗softkey. It’s available to set modulating frequency and modulating waveform if ‘Internal’
source is selected. But if you select External source, the carrier waveform is modulated with an
external waveform. The frequency deviation is controlled by
the ±5 V signal level present on the rear-panel Modulation In connector.
5.4 Amplitude Modulation (AM)
A modulated waveform consists of a carrier waveform and a modulating waveform. In AM, the
amplitude of the carrier is varied by the instantaneous level of the modulating waveform. The
waveform generator will accept an internal or external modulation source.
You must select AM before setting up any of the other modulation parameters. Press 【Modulate】
key then select the AM using the 〖Mod Type〗softkey. The AM waveform is output using the present
settings for the carrier frequency, modulating frequency, output amplitude, and offset voltage.
5.4.1 Set Carrier
Firstly, set the shape, frequency, amplitude and offset of Carrier Waveform. You can select most
waveforms from above table to be carrier, but some waveforms are not available.