Waveform Integration
3–138
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
Read the time difference between the long vertical bars of the paired
cursors from the : readout.
You can also use automated measurements to measure integral math waveforms.
Use the same procedure as is found under Waveform Differentiation on
page 3–132. When using that procedure, note that your measurements on an
integral waveform will be in volt-seconds (if the vertical units are volts) rather
than in volts per second as is indicated for the differential waveform measured in
the procedure.
Usage Considerations
When creating integrated math waveforms from live channel waveforms,
consider the following topics.
Note the following requirements for obtaining a good display:
Scale and position the source waveform so it is contained on screen. (Off
screen waveforms may be clipped, resulting in errors in the integral
waveform).
You can use vertical position and vertical offset to position your source
waveform. The vertical position and vertical offset will not affect your
integral waveform unless you position the source waveform off screen so it
is clipped.
When using the vertical scale knob to scale the source waveform, note that it
also scales your integral waveform.
The oscilloscope integrates any DC offset along with the time varying portions
of your waveform. Even a few divisions of offset may be enough to ensure that
the integral waveform saturates (clips), especially with long record lengths.
You may be able to avoid saturating your integral waveform if you choose a
shorter record length. Reducing the sample rate with the source channel selected
might also prevent clipping. You can also select AC coupling in the vertical
menu of the source waveform or otherwise DC filter it before applying it to the
oscilloscope input.
Once you have your waveform optimally displayed, you may magnify (or
reduce) it vertically and horizontally to inspect any feature. Just be sure the
integrated waveform is the selected waveform.
If you wish to see the zoom factor (2X, 5X, etc.) you need to turn Zoom on.
Automated Measurements
of an Integral Waveform
Offset, Position, and Scale
DC Offset
Zoom
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