Oscilloscope Reference Spectral math controls
Spectral math controls
The s pectral analyzer contains five primary control categories. These are shown in the table below.
Click one of the links for more information on using each type of control.
Time controls (see
page 760)
Gate controls (see
page 762)
Frequency controls
(see page 763)
Magnitude controls
(see page 765)
Phase controls
(see page 766)
Source
Position
Center
dB, dBm linear, real
imaginary
degrees, radians,
group delay
Duration, record
length
Duration
Span Ref level
Zero threshold
Duration, sample
rate
Window Resolution
bandwidth
Ref level offset
Phase Unwrap
Resolution
xxx
What do you want to do next?
Learn about using spectral analyzer windows. (see page 771)
Learn how to recognize aliasing. (see page 780)
Go to a step-by-step procedure for defining a spectral math waveform. (see page 623)
Spectral math time controls
The operation of the time domain controls for the spectral analyzer is summarized by the following rules:
Dura
tion selects the time from the beginning to the end of the acquired waveform. You may set
duration using the record length control or the sample rate control.
Res
olution determines the time between samples. Duration is kept c onstant as resolution is changed.
Therefore, the Resolution control affects both the sample rate and the record length simultaneously.
Mo
st often, you will want to use a short record length b ecause long record lengths can slow instrument
response. However, long record lengths lower the noise relative to the signal and increase the
frequency resolution for the spectral math waveform. More importantly, they might be needed to
capture the waveform feature that you want to include in the waveform.
Examples of how duration and resolution affect the acquired waveform are shown in the next figure.
760 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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