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HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

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FFTSTOP<br />

FFT Stop Frequency<br />

Sets the FFI’ stop frequency of the FFT measurement.<br />

Syntax<br />

FFTSTOP FFT Stop Frequency<br />

Item Description/Default R-e<br />

Number Any real or integer number. Default unit is Hz. Range is limited by<br />

the range of the<br />

sweep time for the<br />

Prerequisite Comm<strong>and</strong>s: FFI’AUTO, FFTSNGLS, FFTCONTS.<br />

Related Comm<strong>and</strong>s: ST.<br />

Example<br />

OUTPUT 718 * “FFTCONTS - ”<br />

OUTPUT 718; “FFTSTOP ;KHZ; ”<br />

Description<br />

Starts the FFT<br />

Sets the FlTstopjYequemy to 1 kHz.<br />

To change the FFT stop frequency, FFTSTOP changes the sweep time of the spectrum analyzer<br />

as follows:<br />

400<br />

FFT stop frequency = (Sweep time x 2j<br />

You can execute the FFTSTOP comm<strong>and</strong> two different ways. You can either execute the<br />

FFTSTOP comm<strong>and</strong> directly (for example, “FFTSTOP 1; ‘I) or use the MOV comm<strong>and</strong> to move<br />

the 1 or 0 into the FFTSTOP comm<strong>and</strong> (for example, “MOV FFTSTOP, 1; ‘I). If you use the MOV<br />

comm<strong>and</strong>, no text is displayed in the active function area during comm<strong>and</strong> execution.<br />

Programming Comm<strong>and</strong>s 5-177

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