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Publication No. 980935 Rev. A
3152B User Manual
EADS North America Test and Services
Operation 3-29
Generating
Modulated
Waveforms
The modulation generator is a separate instrument within the
3152B. Based on DDS technology, it has a wide dynamic range and
high linearity throughout the modulation range.
The 3152B can modulate in the frequency, amplitude, and phase
domains. When the modulation output is selected but modulation is
turned off, the instrument generates a continuous wave (CW)
signal, or steady-state sine wave. The following commands control
the modulation of the carrier wave:
mod:type off
This disables modulation so that the output
generates a CW signal. CW is the sine waveform
that is being modulated. When placed in
Modulation Off, the sine waveform is
continuously generated from the main output. In
this mode, sine waveforms can be generated
from 100
μ
Hz to 100
MHz. Modulation off
operates in Continuous Mode only. The CW
settings do not automatically change when you
switch from one modulation function to another.
mod:type am
This selects amplitude modulation (AM). The
modulating signal is internal, and the following
parameters control the AM scheme: modulation
shape, modulation frequency, and modulation
depth.
mod:type fm
This selects frequency modulation (FM). The
modulating signal is internal, and the following
parameters control the FM scheme: modulation
shape, modulation frequency, and marker
placement.
mod:type swe
This selects sweep modulation. The modulating
signal is internal, and the following parameters
control the sweep: start and stop frequency,
sweep time and direction, sweep spacing, and
marker placement.
mod:type fsk
This selects frequency shift keying (FSK). The
shift sequence is created in a data table that can
hold up to 4,000 frequency shift steps. The
following parameters control FSK modulation:
shifted frequency, baud, shift data array, and
marker placement.
mod:type ask
This selects amplitude shift keying (ASK)
modulation. The shift sequence is created in a
data table that can hold up to 1,000 amplitude-
shift steps. The following parameters control
ASK modulation: shifted amplitude, baud, shift
data array, and marker placement.
mod:type psk
This selects the phase shift keying (PSK). The
shift sequence is created in a data table that can
hold up to 4,000 shift steps. The following
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