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TDS 620A, 640A & 644A User Manual
3Ć143
Waveform Integration
Advanced DSP Math (optional on TDS 620A & TDS 640A), provides waveĆ
form integration that allows you to display an integral math waveform that is
an integrated version of the acquired waveform. Such waveforms find use in
the following applications:
H Measuring of power and energy, such as in switching power supplies
H Characterizing mechanical transducers, as when integrating the output
of an accelerometer to obtain velocity
The integral math waveform, derived from the sampled waveform, is comĆ
puted based on the following equation:
y(n) + scale
n
S
i + 1
x(i) ) x(i * 1)
2
T
Where: x(i) is the source waveform
y(n) is a point in the integral math waveform
scale is the output scale factor
T is the time between samples
Since the resultant math waveform is an integral waveform, its vertical scale
is in voltĆseconds (its horizontal scale is in seconds). The source signal is
integrated over its entire record length; therefore, the math waveform record
length equals that of the source waveform.
To obtain an integral math waveform:
1. Connect the waveform to the desired channel input and select that
channel.
2. Adjust the vertical and horizontal scales and trigger the display (or press
AUTOSET).
3. Press MORE ➞ Math1, Math2,orMath3 (main) ➞ Change Math
waveform definition (side) ➞ Single Wfm Math (main).
4. Press Set Single Source to (side). Repeatedly press the same button
until the channel source selected in step 1 appears in the menu label.
Description
Operation