User Manual 41
5.4.6 Phase Deviation
Phase deviation is the deviation of the modulating waveform phase relative to the carrier
waveform phase. Press
Deviation
to set the PM phase deviation.
Use the numeric keyboard or direction keys and knob to input the desired phase value.
The range of phase deviation is from 0º to 360º.
When "Ext" modulation source is selected, the phase deviation is controlled by the ±2.5V signal
level at the
[Sync/Mod/Trig]
connector at the pront panel. For example, if the phase deviation is
set to 180º, +2.5V signal level corresponds to a 180º phase variation. The lower the external
signal level, the less deviation would be generated.
5.5 2ASK
You can configure the instrument to "shift" its output amplitude between two preset values using
2ASK modulation. The rate at which the output shifts between the two amplitudes (called the
"carrier amplitude" and the "modulation amplitude") is determined by the internal signal level of
the instrument or the signal level on the front-panel
[Sync/Mod/Trig]
connector.
5.5.1 Select 2ASK Modulation
Press
Mod->Type->2ASK
to enable this function.
When
Mod
is enabled,
Sweep
or
Burst
will be disabled automatically.
After 2ASK is enabled, the instrument will generate 2ASK waveform with the currently specified
carrier and modulating waveforms. To avoid multiple waveform changes, enable modulation
after configuring the other modulation parameters.
5.5.2 Carrier Waveform Shape
2ASK 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.
5.5.3 Carrier Amplitude
Choose carrier waveform shape, press
Amplitude/HighLevel
to highlight "Amplitude", and then
use the numeric keyboard or direction keys and knob to input the desired amplitude. The available
amplitude range is limited by
Frequency/Period
. Please refer to the "Output Characteristics"
