Saluki S3531 series, Руководство пользователя

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6.16 Span
Press the [Span/X Axis] on the front panel to enable the span function and set the signal/spectrum analyzer into center
frequency/span mode. Press the [Span] key to pop up [Span], [Full Span], [Zero Span] and [Previous Span] at the same time.
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[Span]
Menu description: the span can be set by number keys, stepping keys or knob. Use number keys or select [Zero Span] to set
the span as zero.

[Full Span]
Menu description: to set the signal/spectrum analyzer into the center frequency/span mode. Set the span as maximum value.

[Zero Span]
Menu description: to set span as 0Hz. It is good for observing signal at time domain, in particular, good for observation of
modulating signal.
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[Last Span]
Menu description: to set the signal/spectrum analyzer back to the previous span.