Publication No. 980935 Rev. A
3152B User Manual
for the AM function to operate correctly. Note that the modulating
frequency setting is common to both channels.
Depth –
The Depth parameter programs the modulation depth, or
index in percent of the un-modulated CW amplitude. The depth is
symmetrical about the center of the CW amplitude. Each channel
can have a unique setting of the modulation depth.
To access the required parameter, click on the parameter name
and observe that the LED next to the required parameter turns on.
The value that is associated with the lit LED is displayed on the
digital display. You can use the dial, keyboard, or the [
↑
] [
↓
} keys to
adjust the readout to the required setting. After you modify the
reading, click on the Modify/Execute knob to update the 3152B with
the new setting.
Sweep
The Sweep Modulation panel (Figure 4-16) contains parameters for
controlling the sweep function. To turn the sweep function on and
off, click on the Sweep button in the State group. The various
groups in the sweep panel are described below.
State
The State button turns on and off the Sweep function.
Sweep Parameters
This group contains parameters that allow complete control over the
sweep function. These are:
Baseline –
The Baseline parameter affects the output
characteristics in one of the interrupted run modes (i.e., triggered,
burst). In this case this parameter defines where the signal idles
between triggers. There are two options: CW and DC. The DC
option will set the idle state to a DC level, meaning that in between
triggers, the output resides on a DC level and generates modulation
when a trigger is accepted. The CW is similar except the signal
idles on the pre-trigger CW frequency setting, executes the
modulation upon receipt of a legal trigger signal and returns to
continuous CW frequency output. Note that in sweep modulation,
the Start parameter replaces the CW value.
Function –
The Function buttons select which of the waveforms will
be swept. The sine wave is the default waveform and it is swept
using the DDS circuit. The other two waveforms, triangle and
square, are computed and the swept coordinates placed in the
arbitrary memory. The calculation of the sine and triangle
waveforms takes a long time (any time between seconds to
minutes, depending on the complexity of the sweep) so should only
be used when absolutely necessary in the application.
EADS North America Test and Services
ArbConnection 4-23
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com