Tektronix TDS5054, Руководство пользователя

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Creating and Using Math Waveforms
TDS5000 Series User Manual
3- 175
Use this procedure to define a spectral math waveform. If you have purchased
the Advanced Analysis option (TDS5UP Option 2A), use the subsequent
procedure beginning on page 3--176.
Overview To define a spectral math waveform Control elements and resources
Prerequisites 1. All sources that you will use in your math waveform
must be available.
See page page 3--25 for acquisition setup
Open the Math
Setup control
window
2. From the toolbar, click the Math button to open the Math
Setup control window.
3. Click the Math n tab of the math waveform you want to
define.
Select the
source and
display the
spectral
waveform
4. Select the source for the spectral waveform from the
FFT Source drop-down list. The source can be a live
waveform or another math waveform.
Notice that the spectral waveform is displayed as soon
as you select the source.
Set the
magnitude
scale
5. Select a value from the Scale drop-down list to select
the vertical scale factor:
H
dB displays magnitude using the log scale,
expressed in dB relative to the reference level
offset.
H
Linear displays magnitude using units equal to the
source units.
H
dBm sets the reference level offset to predefined
values for dBm.
Tip. You can adjust the scale and position by clicking
the waveform handle and using the multipurpose knobs.
Defining a Spectral Math
Waveform