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Chapter 4 93
Making Measurements
Preparing for Measurements
Changing the View
The following keys enable you to select the desired view of the
measurement and to change scale parameters for the graphic window.
View/Trace - Selects a predefined view of the current measurement and
highlights the selected window. Once a window is selected, the X and Y
scale keys can be used to modify scale parameters. The types of
windows, and X and Y scale parameters that are available will vary,
depending on the measurement you have activated.
• Typical Measurement Windows
Spectrum window - Select this window if you want to view a
signal in parameters of frequency and power. Changes to
frequency span or power will sometimes affect data acquisition.
For more details see the section on spectrum measurements.
Signal Envelope window - Select this window to view a signal
in parameters of time and power. For more detail see the section
on waveform measurements. Both RF and BbIQ signals can be
viewed in this window.
I/Q Waveform window - Select this window to view the I and Q
signal characteristics of the current measurement in parameters
of voltage and time. This window is in both the spectrum and
waveform measurements.
Press
View/Trace, Spectrum, to view a spectrum measurement window,
or
View/Trace, Waveform to view a waveform measurement window.
• Trace Display
All - Displays both the current and the average trace.
Average - Displays only the average trace. The average trace is
shown in blue.
Current - Displays only the trace for the latest data acquisition.
The current trace is shown in yellow.
• Span / X Scale Keys
Span key. This key allows you to modify the frequency span.
Changes in span may affect data acquisition.
Scale/Div key. This key allows you to modify the X scale
parameter in units of time.
Sweep Time key. This key allows you to modify sweep time.
Changes in sweep time will affect data acquisition.
Ref Value key. This key allows you to set the value of the
reference level for X scale display in units of time.
Ref Position key. This key allows you to place the current