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Zero span, Span, Last span – GW Instek GSP-827 User Manual User Manual

Page 39: 7ghz spectrum analyzer operation manual ⎯ ⎯ 38

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2.7GHz Spectrum Analyzer Operation Manual

38

Zero Span

When Zero Span is performed, the measuring frequency will stop sweeping, and only fixes on
Center frequency. An example of AM (amplitude modulation) signal is described above. The
modulating signal is at 100Hz sine wave. Since the measuring frequency is fixed, the display
will present the amplitude variation of AM signal, which is at 100Hz in this case.

Last Span

Return to the last span by using this key.

InputZ

Cal

1

Zero

Span

RBW:4MHz

VBW:10 kHz

Center:100.0MHz
Span:Zero Span

Sweep:100.0ms

Span

Ref

Lvl: -30.0 dBm

-30.0

-40.0

-50.0

-60.0

-70.0

-80.0

-90.0

-110.0

-100.0

SAT JAN 28, 2003

14:30:25

INT:REF

AMPL CAL

Full

Span

Zero

Span

Last

Span

Span

Start:99.0MHz

RBW:300 kHz

Stop:101.0MH

VBW:100 kHz

Center:100.0MHz
Span:2.0MHz

Sweep:200.0ms

Span:20.0MHz

Span

Ref

Lvl: -30.0 dBm

-30.0

-40.0

-50.0

-60.0

-70.0

-80.0

-90.0

-110.0

-100.0

SAT JAN 28, 2003

14:30:25

INT:REF

AMPL CAL

Full

Span

Zero

Span

Last

Span

Last

Span

1