Use this tab to create signals made-up of multiple tones, either equally or arbitrarily
spaced. It also allows for the definition of a frequency interval without tones (or notch)
for NPR (Noise Power Ratio) testing. Amplitudes and phases of the individual tones can
be corrected through correction factor files defined by the user. The Multi-Tone tab
allows you to generate signals for both direct and up-converter (IQ) modes. It also
provides a graphic waveform preview functionality, which can be used to validate the
location and amplitudes of the tones in the signal before sending it to the instrument or
be stored in a file for later use. The signal’s crest factor or Peak-to-Average Power Ratio
(PAPR) is also shown. The application handles requirements and limits of the target
hardware in aspects such as maximum and minimum record lengths, sampling rate, and
record length granularity. As a result, generation of signals designed in this tab will
always be feasible through the instrument, and they will be free of distortions such as
wrap-around or timing artifacts, even if they are generated in looped mode.
There are two basic operation modes for the definition of equally spaced or arbitrarily
distributed tones respectively. The selection between the two modes is made through
the “Tone Distribution” drop-down list. This control affects the contents of the “Basic
Multi-Tone Waveform Parameters” section of the user interface and the presence of the
“Notch Parameter” section, which only makes sense in case of equally spaced tones.
However, controls in the other control groups are valid and operative for both operating
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