Tektronix TDS5000B Series, Онлайн руководство пользователя, Страница: 357 / 420

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Recalling Reference Waveforms
Use this procedure to recall a reference waveform from a file.
1
Click Recall on the toolbar or select Recall from the File menu.
2 Select Waveform from the Recall dialog box.
3 Select the waveform that you want to recall and the Destination (Ref 1–4).
4 Click Recall to load the waveform into memory.
You can now use the reference waveforms for measurements, math functions, or other uses.
Simply select the reference waveform from the Channel Selector tabs on the individual control
windows.
Note
When you recall a reference waveform from a file, a new file containing waveform data is created
in
C:\TekScope\Waveforms
. The file is named
TDS_REFn.WFM
, where
n
is the reference
waveform number. This file is deleted when the reference waveform is deleted.
Recalling a Template Waveform
Use the procedure to recall a template waveform to a reference location.
1
From the File menu click Recall….
2 Under Recall What: click Waveform, and then select the waveform that you want to recall.
3 Select Ref1–4 from the Destination list.
4 Click Recall.
Creating a Spectral Waveform
Use these steps to display a spectral (FFT magnitude) waveform.
1
Set the source signal Vertical SCALE so that the signal peaks do not go off screen. Off-
screen signal peaks can result in FFT waveform errors.
2 Set the Horizontal SCALE control to show five or more cycles of the source signal.
Showing more cycles means the FFT waveform can show more frequency components,
provide better frequency resolution, and reduce aliasing.
3 If the signal is a single-shot (transient) signal, make sure that the entire signal (transient
event and ringing or noise) is displayed and centered on the screen.
4 Click Math on the toolbar, or click Math Setup from the Math menu to open the Math Setup
control window.
5 Click Setup under the Spectral Analysis section in the control window.
6 Click the Magnitude button to insert the magnitude function into the math expression.
7 Click the channel that is related to the time-domain signal that you want to view as an FFT
waveform. The respective channel is inserted into the math expression.
8 Select the appropriate vertical scale and FFT window type.