5.13.3 Carrier Waveform Duty
Press
[Wave] > Square
softkey
to select square
as carrier waveform.
Press
[Setting] >Duty
softkey, then input the required value through the numeric keypad or knob.
5.13.4 Modulation Source
Press
[Mod] > Signal Source
softkey to select Internal, External or Another Channel as the
modulation source.
Internal Source
When internal modulation source is selected, press
Shape
softkey to select Sine, Square, Ramp,
Noise or Arb as the modulation source. The default is Sine.
Sine
Square: 50% duty cycle
Ramp: 50% symmetry.
Noise
Arb: Sinc, Exp Fall, Haver Sine, Lorentz, Gause, Dual Tone, ECG.
Note: Noise can be used as modulating waveform but cannot be used as carrier waveform.
External Source
When external modulation source is selected, the
Frequency
and
Shape
menu in the modulation
menu is grayed out and disabled. The instrument receives the external modulation signal from the
[FSK/Trig/Sync/Extmod]
connector on the rear panel. The Duty Deviation is controlled by ±4V
signal level on this connector.
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.
5.13.5 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 value.
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 is selected.
User Manual 53
