Reference
Math and FFT
Math and FFT functions are part of the Vertical menu group.
Math Waveform
Push the Math button to defi ne the math waveform using the math menu. Also
push the Math button to display or select the math waveform. The bottom menu
will show other menu items when you have a TDS3AAM application module
installed.
Bottom Side Description
Set 1st Source to Selects the firs t source waveform.
Set Operator to Selects the math operator: +, -, ×,
or ÷
Dual Wfm Math
Set 2nd Source to Selects the second source
waveform.
Key Points
Dual-Waveform Math. For the dual-waveform math operations, the two source
waveforms interact with the m ath operators in the sequence shown next.
Operation Expression of math waveform
+
Source 1 + Source 2
-
Source 1 - Source 2
×
Source 1 × Source 2
÷
Source 1 ÷ Source 2
Scaling and Positioning the Math Waveform. To position or scale a math
waveform, select the math waveform and then adjust it with a vertical Position or
Scale control. You can do this whether acquisition is running or is stopped.
Math Interaction with Preview. If you select a channel waveform and then adjust
the vertical Position or Scale control while the acquisition is stopped, the math
waveform remains fixed. It does not track the changes you see to the channel
waveform. The same is true if you adjust the horizontal Position or Scale control
under t
hese conditions.
Gray-Scale Restriction. Math waveforms are always based on the most current
acquisitions and do not contain any gray-scale information.
Source Waveform Screen Position. When displa ying dual-waveform math
waveforms, make sure that th e source waveforms do not extend beyond the top or
bottom edge of the screen. If part of the source waveform is positioned outside
the screen, the math waveform may not display correctly.
72 TDS3000C Series Oscilloscope User Manual
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