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

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

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STDEV<br />

St<strong>and</strong>ard Deviation of Trace Amplitudes<br />

STDEV St<strong>and</strong>ard Deviation of Trace Amplitudes<br />

Returns the st<strong>and</strong>ard deviation of the trace amplitude in measurement units.<br />

Syntax<br />

9 u s e r - d e f i n e d t r a c e I<br />

f u n c t i o n p a t h o n l y<br />

Item Description/Default RanBe<br />

User-defined trace A trace deEned by the TRDEF comm<strong>and</strong>. Any valid trace name.<br />

Trace range A segment of trace A, trace B, trace C, or a user-defined trace.<br />

Prerequisite Comm<strong>and</strong>s: TRDEF when using a user-defined trace. TS when using trace data.<br />

Related Comm<strong>and</strong>s: MEAN, PDA, PDF, VARIANCE.<br />

Example<br />

The following program segment finds the st<strong>and</strong>ard deviation of the amplitude of trace A.<br />

OUTPUT 718; “IP; ”<br />

OUTPUT 718 ; “SNGLS ; ”<br />

OUTPUT 718;“CF 300MHZ;SP 2MHZ;RB IOOKHZ;”<br />

OUTPUT 7 18 ; “TS ; ”<br />

OUTPUT 718;“STDEV TRA?;”<br />

ENTER 718;Number<br />

PRINT “THE STANDARD DEVIATION OF TRACE A ” ;Number/lOO; “DB”<br />

XSTDEV<br />

Initializes spectrum analym<br />

Activates single-sweep mode.<br />

Changes the center frequencg,<br />

span, <strong>and</strong> resolution<br />

b<strong>and</strong>width.<br />

!Rxkes sweep.<br />

Finds the st<strong>and</strong>ard deviation<br />

of trace A.<br />

Get the response from<br />

the spectrum analyzer:<br />

Programming Comm<strong>and</strong>s 5-629

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