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Noise Generator
The instrument contains a wide-band Gaussian white noise generator for each channel which may
be used in the following ways:
•
As the main output from the carrier wave generator
•
As a modulating waveform
•
Added as a percentage to the current output waveform
These options are described in the following sections. In dual channel mode there are some
restrictions on Noise; see the Dual-Channel Operations section of the Specification for details.
Carrier Wave Noise
Pressing the Noise/PRBS key will switch to the Noise/PRBS function and show the screen below.
There is no
Freq
soft-key because the noise frequency cannot be edited. The amplitude or dc
offset may be changed in either of the ways detailed in General: Numeric Editing. It is also possible
to edit these parameters in terms of high level and low level.
Pressing the
Type
soft-key shows the following and allows the PRBS function to be selected.
See the PRBS section for more information on editing PRBS waveforms.
Noise Modulation
Noise may be used as a modulation shape in the same way as sine or ramp etc. However, noise
cannot be used as a carrier wave for modulation. See the Modulation section for more information.
Added Noise
Noise may be added to any output waveform except square, pulse and noise. However, it is
possible to add noise to the arbitrary square-wave found at ARB-
Load
-
BuiltIn2
-
Square.
See the Continuous Carrier Waveform Operation: Arb Load section for more information on built in
arbs.
