Send an E-mail on Trigger.
1. Select the trigger type.
2. Select the trigger source.
3. Set the appropriate parameters for the trigger.
4. From the Mode tab, click E-mail on Trigger to On.
5. Press the Run/Stop button to begin acquiring data to trigger.
Creating spectral waveforms
Create 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 the Basic button.
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 FFT window type.
9. Set the Vertical Scale and Reference as appropriate.
Aliasing
Problems occur when the instrument acquires a signal containing frequency components that are higher in frequency than the
Nyquist frequency. The Nyquist frequency is the highest frequency that any digital oscilloscope can measure without errors, and
is one-half of the sample rate or frequency.
The frequency components that are above the Nyquist frequency are under sampled and appear to "fold back" around the
Nyquist frequency, showing as lower frequency components. These incorrect components are called aliases.
To quickly check for aliasing, slowly decrease the horizontal time scale. If the shape of the displayed waveform changes
drastically or becomes stable, your waveform is probably aliased. You can also check for aliasing by turning on peak detect
acquisition mode. To remove aliasing, modify the record length.
How to ?
610 DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series
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