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SIGLENT
20 User Manual
mode automatically. This function is usually used in channel switching. For example, in harmonic
measurement, firstly locate the signal at the center frequency (CF) of the display, and then execute
CF->Step. Next you can press the upward direction key continuously to measure each order of harmonic
in sequence.
2.1.2 Span
Set the span of the analyzer. Any change of this parameter will affect the frequency parameters and
restart the sweep.
2.1.2.1 Span
Set the frequency range of the current sweep. The center frequency and span are displayed at the
bottom of the grid respectively.
● The start and stop frequency vary with the span when the center frequency is constant.
● In non-zero span mode, the span can be set down to 100 Hz and up to the full span described in
Specifications. When the span is set to the maximum, the analyzer enters full span mode.
● Modifying the span in non-zero span mode may cause an automatic change in both Freq Step and
RBW if they are in Auto mode. Besides, the change of RBW may influence VBW (in Auto VBW
mode).
● Variation in the span, RBW or VBW would cause a change in the sweep time.
Table 2-6 Span
Parameter
Explanation
Default
Full Span
Range
0 Hz ~ Full Span
Unit
GHz, MHz, kHz, Hz
Knob Step
Span/200, min 1 Hz
Direction Key Step
In 1-2-5 sequence
Related to
Start Freq, Stop Freq, Freq Step, RBW, Sweep time
Note: 0 Hz is available only in zero span.
2.1.2.2 Full Span
Set the span of the analyzer to the maximum available frequency span.
2.1.2.3 Zero Span
Set the span of the analyzer to 0Hz. Both the start and stop frequencies will equal to center frequency
and the horizontal axis will denote time. The analyzer measures the time domain characteristics of the
amplitude of the corresponding frequency point of the input signal.
● The following functions are invalid in Zero span:
• Frequency: Peak->CF and Signal Track;
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