5.3.1 Select FM Modulation
Press
[Mod] >Type > FM
softkey to enable FM function.
When
Mod
is enabled,
Sweep
or
Burst
will be disabled automatically.
After FM is enabled, the instrument will generate FM waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.3.2 Carrier Waveform Shape
FM carrier shape: Sine (default), Square, Ramp, Pulse, Arbitrary (except DC) or Harmonic
waveform
.
Press
[Wave]
button on the front panel to select the desired carrier waveform.
Noise and DC could not be used as carrier waveform.
5.3.3 Carrier Waveform Frequency
For different carrier waveforms, the settable range of carrier frequency is different. please refer to
"Frequency Characteristics" in "
".The default value is 1kHz.
Press
[Setting] > Frequency
softkey on the front panel, and then use the numeric keypad or
direction keys and knob to input the desired frequency value.
5.3.4 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. At this point, the FM modulation frequency
deviation is controlled by the ±4V signal level on the connector.
User Manual 38
