Tektronix TDS 684A, TDS 744A, TDS 784A - page 221

Using Features for Advanced Applications
3–166 TDS 684A, TDS 744A, & TDS 784A User Manual
The integral math waveform, derived from the sampled waveform, is computed
based on the following equation:
y(n)+scale
n

i+1
x(i))x(i*1)
2T
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
volt-seconds (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, do the following steps:
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, or Math3 (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.
5. Press Set Function to (side). Repeatedly press the same button until intg
appears in the menu label.
6. Press OK Create Math Waveform (side) to turn on the integral math
waveform.
You should now have your integral math waveform on screen. See Fig-
ure 3–97. Use the Vertical SCALE and POSITION knobs to size and
position your waveform as you require.
To Create a Integral Math
Waveform