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Waveform Math
TDS 620A, 640A & 644A User Manual
3Ć149
NOTE
If your digitizing oscilloscope is equipped with Advanced DSP Math
(optional on TDS 620A & TDS 640A), the menu item FFT will be at
the same brightness as the menu items Single Wfm Math and
Dual Wfm Math; otherwise, FFT will be dimmed. See pages 3Ć36,
3Ć139, and 3Ć143 for information on FFTs and other advanced math
waveforms.
2. Press Average (side) and enter a value with the general purpose knob
or the keypad to take an average of multiple acquisitions. Press No
Extended Processing (side) to perform math operations only on one
acquisition.
3. If desired, turn on or turn off math averaging. To turn on math averaging,
press Average (side) and turn the general purpose knob (or use the
keypad) to enter the number of times to successively average the math
waveform before completing an acquisition. Press No Extended ProĆ
cessing (side) to turn off math averaging.
4. Press Change Math waveform definition (side) ➞ FFT (if your oscilloĆ
scope contains Advanced DSP Math), Single Wfm Math,orDual Wfm
Math (main) to alter the present math waveform definition (see FigĆ
ure 3Ć80).
The single and dual waveform operations are described separately in
the following topics. For descriptions of Advanced DSP Math, see Fast
Fourier Transforms on page 3Ć36, Waveform Differentiation on
page 3Ć139, and Waveform Integration on 3Ć143.
Single Wfm Math
1. Press MORE ➞ Math1, Math2,orMath3 (main) ➞ Change Math
waveform definition (side) ➞ Single Wfm Math (main). Press Set
Function to (side) to select inv (invert), intg (if your oscilloscope conĆ
tains Advanced DSP Math), or diff (if your oscilloscope contains AdĆ
vanced DSP Math). Waveform integration (intg) is described on
page 3Ć143, and waveform differentiation (diff) is described on
page 3Ć139.
2. To define the source waveform, press Set Single Source to (side).
3. When you are ready to perform the function, press OK Create Math
Wfm (side).