Keysight M8195A User Manual page 67

Keysight M8195A Revision 2 – Arbitrary Waveform Generator User's Guide

Phase Distribution
Phase for each tone can be set in the three different modes: constant, random,
and parabolic. While constant phase Multi-Tone signals show a high crest
factor, a random phase distribution results in a much lower value for this
parameter while a parabolic distribution results in a close to optimal (or
minimum) crest factor.
 Seed
This parameter is associated to the random phase distribution and allows
generating the same or different random sequences for the phases of each
tone. It is also useful to look for a distribution resulting in a desired crest factor
value.
Notch Parameters Section

Notch Active
This check box activates or deactivates the generation of a notch in the equally
spaced Multi-Tone signal.
 Start Tone
It is the index of the first tone to be removed in a notch. Acceptable indexes
start with 1.

Stop Tone
It is the index of the last tone to be removed in a notch. Acceptable indexes
start with 1.
 Center Frequency
It is an indicator only. The central frequency for the notch is computed and
shown in this field.

Span
It is an indicator only. The tone-free frequency span for the notch is computed
and shown in this field.
Arbitrary Tones Section
Alternatively, an edition table shows-up for arbitrarily spaced tones definition
("Arbitrary" selected in the Tone Distribution drop-down list). When not
previously edited (or empty), the table is automatically loaded with the
parameters of the tones defined in the equally spaced tone section. This allows
for easy edition of individual tones or the creation of multiple notches, or both.
Parameters for each tone include its frequency (in Hz), its relative amplitude
(in dB), and phase (in degrees). Entries in the table may be added, edited, and
deleted. Entries in the table may be also sorted in ascending or descending
order of any parameter by clicking in the corresponding field name.
Addition of a new entry in the table must be done by editing the empty edition
field located at the bottom of the table. Deletion of any number of entries can
be performed by selecting the ones to be deleted and then hitting the <Del>
key of the keyboard. Meaningful numeric values must be typed into the edition
fields. Otherwise an error condition is triggered. While a valid frequency entry
must be always entered, any of the amplitude and phase edition fields may
kept empty so they take the default values (0.0 dB for Amplitude and 0.0
degrees for Phase).
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