Tektronix SPECMON3 Manual page 125

General Signal Viewing
Freq & Span Tab
The Freq & Span tab provides access to settings that control frequency settings for the trace display. The
control values set in this tab are shared by all the General Signal Viewing displays.
Setting
Center
Start
Stop
Step Size
Span
Dwell time (DPX display only)
Max Span
xxx
Center, Start, Stop, and Span Frequencies Are Correlated
Changing the values for Center frequency, Start frequency, Stop frequency or Span will change the values
for the other settings, depending on which setting you change. For example, if you change the Center
frequency, the Start and Stop frequencies will be adjusted automatically to maintain the same Span.
Note however that if the Start and Stop frequencies are changed so that they are closer than the minimum
span setting, the Start and Stop frequencies will be adjusted to maintain the minimum Span setting.
Setting Changed Manually
Start
Stop
Center
Span
xxx
SPECMON3 & SPECMON6 Printable Help
Description
The frequency at the center of the selected Span.
The lowest frequency in the span.
The highest frequency in the span.
Sets the increment/decrement size for Center, Start and Stop values.
The difference between the start and stop frequencies. This is the measurement
bandwidth for the general signal viewing displays.
The amount of time the DPX sweep remains in a frequency segment collecting data
and updating the bitmap and traces before moving on to the next higher frequency
segment. The minimum Dwell Time setting is 50 ms, the normal update rate for DPX
computations. Maximum Dwell Time per frequency segment is 100 s. The number of
frequency segments and their start/stop frequencies are internally determined based on
span, acquisition bandwidth, RBW and other parameters.
Sets the Span to the maximum value.
Settings Changed Automatically As
a Result
Center, Span
Center, Span
Start, Stop
Start, Stop
Freq & Span Tab
Setting Not Automatically Changed
Stop
Start
Span
Center
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