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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.
5.3.5 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.
5.3.6 Frequency Deviation
Frequency deviation is the deviation of the modulating waveform frequency relative to the carrier
frequency. Press [Mod] > Deviationsoftkey to set the FM frequency deviation.
Frequency deviation must be lower than or equal to the carrier frequency.
Attempting to set a deviation greater than the carrier frequency will cause the instrument to
set the deviation equal to the carrier frequency.
The sum of frequency deviation and carrier frequency must be lower than or equal to the sum
of the current carrier frequency upper limit and 1kHz.
Use the numeric keypad or direction keys and knob to input the desired frequency values.
When external modulation source is selected, the frequency deviation is controlled by the ±4V
signal level on the [FSK/Trig/Sync/Extmod] connector on the rear panel.Positive signal level
corresponds to frequency increase and negative signal level corresponds to frequency decrease.
The lower the level, the less offset is generated. For example, if the frequency deviation is set to
1KHz, +4V signal level corresponds to a 1kHz increase of frequency and -4V signal level
corresponds to a 1kHz decrease of frequency.
5.4 PMModulation
A modulated waveform consists of a carrier waveform and a modulating waveform. In PM, the
carrier phase is varied by the voltage level of the modulating waveform.
User Manual 39
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