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100%, the output amplitude is maximum when the external modulation signal is +4V, and the
output amplitude is the minimum when the external modulation signal is -4V.
Other Channels
CH1 and CH2 can be used as modulation sources reciprocally. When CH1 is used as the
modulated wave, CH2 can be used as the modulation source. And vice versa.
When selecting another channel as the modulation source, please turn on the output of that
channel.
5.2.5 Modulation Frequency
When internal modulation source is selected, press [Mod] >Frequency softkey to set the
frequency of the modulating waveform.
Use the numeric keypad or direction keys and knob to enter the desired frequency values.
The modulating waveform frequency range is 2mHz to 1MHz, and the default value is 100Hz.
Note: This menu will be grayed out and disabled when other modulation sources except the
internal modulation source are selected.
5.2.6 Modulation Depth
The modulation depth represents the degree of amplitude variation, expressed as a
percentage.The modulation depth of DSB-AM can be set from 0% to 120%.
Press [Mod] > Depth softkey to set DSB-AM modulation depth.
Modulation depth range: 0% to 120%. The default is 100%.
At 0% modulation, no signal is output.
At 50% depth, the DSB-AM amplitude is 1/4 of the carrier waveform amplitude.
At 100% depth, the DSB-AM amplitude is half of the carrier waveform amplitude.
In >100% modulation, the DSB-AM amplitude of the instrument would not exceed 10Vpp
(50Ω load).
When external modulation source is select, the output amplitude of the instrument is also
controlled by the ±4V signal level on the [FSK/Trig/Sync/Extmod] connector on the rear
panel.For example, set the modulation depth to 100%, the output amplitude is the maximum when
the modulating signal is +4V or -4V, and the output amplitude is the minimum when the
modulating signal is 0V.
5.3 FMModulation
A modulated waveform consists of a carrier waveform and a modulating waveform. In FM, the
carrier frequency is varied by the voltage level of the modulating waveform.
User Manual 37
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