Publication No. 980935 Rev. A
3152B User Manual
EADS North America Test and Services
Operation 3-31
Controlling the
Carrier Frequency
In general, when you select a modulation scheme, the waveform
being modulated (the carrier) is always a sine wave. When you
select the modulation function but set the modulation type to “Off”,
the output generates an un-modulated, continuous waveform (CW)
signal. The frequency setting of the carrier in modulation mode is
not the same as for standard waveform mode and must be
programmed separately. Use the following command to program
the carrier frequency:
mod:carr <value>
Set the CW frequency in units of Hz. The
same value will be used for all modulation
functions.
Controlling the
Carrier Base Line
As explained above, the Advanced Trigger mode allows the 3152B
output to “idle” when it has finished a waveform segment and is
waiting for the next trigger event. The output signal during this time
is called the
baseline
.
The 3152B offers two options for the base line:
1) Carrier (un-modulated, CW carrier)
2) DC Level
Use the following command to control the carrier base line:
mod:carr:bas carr
Selects continuous wave (CW) when the
modulated function idles between trigger
events.
mod:carr:bas dc
Selects continuous DC level when the
modulated function idles between trigger
events.
Using the Digital
Pulse Generator
The digital pulse generator function provides a way to set up pulse
trains and associated parameters in units of time.
The pulse train is built in the same memory that stores arbitrary
waveforms. Therefore, changing from arbitrary to digital pulse
mode, and vise-versa, may overwrite arbitrary waveforms that were
previously downloaded. Use the command below to select the
digital pulse function:
func:mod dpul
Selects the digital pulse function. If you have
not changed parameters, then the output will
generate a single pulse with the following
default settings: 10
ms period, 0-5
V
amplitude, 10 ms high time, 1 ms rise time,
and 1 ms fall time.
From this point, you may change one or more of the pulse
parameters while the signal is being output. Since the pulse is
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