User Manual 51
When
Mod
is enabled,
Sweep
or
Burst
will be disabled automatically.
After 4FSK is enabled, the instrument will generate 4FSK waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.11.2 Carrier Waveform Shape
4FSK carrier shape: Sine (default), Square, Ramp, Pulse, Arbitrary (except DC) or Harmonic
waveform.
Press the front panel key
Sine
,
Square
,
Ramp
,
Pulse
,
Arb -> Type
or
Harmonic
to select a
desired carrier waveform shape.
Noise and DC could not be used as carrier waveform.
5.11.3 Carrier Frequency
Choose carrier waveform shape, press
Frequency/Period
to highlight "Frequency", and then use
the numeric keyboard or direction keys and knob to input the desired frequency.
Different carrier waveforms have different frequency ranges as shown in the table below. For all
the carrier waveforms, the default value is 1KHz.
Carrier Waveform
Frequency Range
Sine
1μHz to 100MHz
Square
1μHz to 30MHz
Ramp
1μHz to 4MHz
Pulse
1μHz to 15MHz
Arbitrary Waveform
1μHz to 20MHz
5.11.4 Modulating Waveform Source
4FSK uses internal modulation source. The modulation waveform is square.
5.11.5 4FSK Rate
4FSK uses internal modulation source.The 4FSK Rate is the rate at which the output frequency
shifts between "carrier frequency" and three "modulating frequencies". Press
Rate
to set.
Use the numeric keyboard or direction keys and knob to input the desired frequency value.
The frequency range is from 2mHz to 1MHz and the default is 100Hz.
5.11.6 Hopping Frequency
Alternating frequency (hopping frequency) is the modulating frequency. The range of hop
