Wavetek 147 Dokumentacja Pobierz pdf (Strona 160)

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Spectrum Analyzer Mode: Spectrum Mode Operation

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Fig. 7-3 The Spectrum Analyzer ZERO SPAN Screen

ZERO SPAN Submenu

Press this to enter the ZERO SPAN submenu.

In Zero Span mode, the instrument displays the trace of one

discrete frequency over time. Sweep time is on the x-axis, and

amplitude (dBmV) is on the y-axis. You can change the sweep

time for either a closer or a wider look, as necessary.

Zero Span incorporates a large menu of useful features. As with

other modes, you can use the 13 dB amplifier and the 50 MHz

low-pass filter. You can also use the active and inactive (A/B)

markers. In addition, there are elements unique to this

operation available to you. You can trigger the sweep either

manually or automatically to examine the signal. You can also

average successive traces for accurate level measurements.

Notice that the markers change to ‘D’ and ‘U’ (Desired and

Undesired). The marker values are corrected for white noise

and detector crest factor. This will improve the marker accuracy

when you're measuring digital modulated signals and noise

floor.

Press this to enter AMPLIFIER/LOW-PASS FILTER submenu,

then again to return to the ZERO SPAN main menu.

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