Math waveform offset, position, and scale
The settings that you make for of
fset, scale, and position affect the math waveform you obtain. Here are some tips for obtaining a good
display:
• Scale and position the source waveform so that it is contained on the screen. (Off-screen waveforms may be clipped, resulting in errors
in the derivative waveform).
• Use vertical position and vertical offset to position your source waveform. The vertical position and offset will not affect your derivative
waveform unless you position the source waveform off screen so that it is clipped.
Waveform integration
The math capabilities of the instrument include waveform integration. This allows you to display an integral math waveform that is an
integrated version of the acquired waveform.
Use integral waveforms in the following applications:
• Measuring power and energy, such as in switching power supplies.
• Characterizing mechanical transducers, as when integrating the output of an accelerometer to obtain velocity.
The integral math waveform, derived from the sampled waveform, is computed based on the following equation:
Where: x(i) is the source waveform, y(n) is a point in the integral math waveform, scale is the output scale factor
, and 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.
Offset and position
When creating integrated math waveforms from live channel waveforms, consider the following:
Measurement concepts
2 Series MSO MSO24 and MSO22 249
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