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 When working with reference waveforms and FastFrame, if one or more reference waveforms
are used as part of a math waveform, the number of frames in the math waveform is the
smallest of all source waveforms (reference, math, or channel waveforms).
 If one or more reference waveforms are used in a math waveform, the record length is equal
to the smallest of all the source waveforms (reference, math, or channel waveforms). The
math is calculated using the first point from each source, followed by the next point, and so
forth. This is true even if the sources have different times between points in the record.
Spectral Analysis
Click Setup to open the Spectral Setup control window to create math equations to analyze
waveforms in the frequency domain.
Click Control to open the Spectral Controls control window to define the acquisition, gating, and
frequency setups for the frequency domain analysis.
Predefined Spectral
To Use
Click one of the buttons to define the current math waveform as a spectral magnitude waveform or
a spectral phase waveform.
Behavior
The math waveform is based on the last active waveform on the screen. Spectral waveforms are
created from channel waveforms; you cannot create a spectral waveform from math or reference
waveforms. Click Mag to create a spectral magnitude waveform. Click Phase to create a spectral
phase waveform.
Equation Editor Control Window
Access the Equation Editor from the Math menu, or from the Editor button on the Math Setup control
window.
Overview
Use the Equation Editor control window to define or edit advanced math waveforms. The readout
shows the math expression as you construct it. New functions are added at the beginning of the
expression each time that you click one of the function buttons.
You can create a math expression using one or more of the following methods (see also
Guidelines for Working with Math Waveforms):
 On the Time tab, click one or more of the function buttons to insert a time domain function
into the math expression. Then select one of the waveforms as an operand by clicking one of
the Channel Selector tabs. Use the edit controls to add additional numbers and operators to
complete the math expression.
 On the Meas tab, click one or more of the buttons to add the corresponding defined
measurements. Use the edit controls and the Channel Selector tabs as necessary to add
waveforms, additional numbers, and operators to complete the math expression.
 Use the edit controls with the Channel Selector tabs to create simple math expressions using
existing waveforms, numbers, and operators.
 Use an external keyboard to enter the math expression.
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