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

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VARIANCE<br />

Variance of Trace Amplitudes<br />

Returns the amplitude variance of the specified trace, in measurement units.<br />

Syntax<br />

VAR I ANCE<br />

. .<br />

Item Description/Default Range<br />

User-defined trace A trace delined 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, RMS, STDEV.<br />

Example<br />

OUTPUT 718;"IP;"<br />

OUTPUT 718;"SNGLS;TS;"<br />

OUTPUT 718;"VARIANCE TRA?;"<br />

ENTER 718;Number<br />

DISP Number;"MEASUREMENT UNITS"<br />

Description<br />

Initializes analyzex<br />

Activates single-sweep mode.<br />

I&turns variance of trace A to computer:<br />

Stores value in computer variable.<br />

LXsplu~s the results on computer screen.<br />

‘lkking the square root of a variance yields the st<strong>and</strong>ard deviation value.<br />

The formula to calculate the variance is as follows:<br />

5-584 Programming Comm<strong>and</strong>s<br />

n-l<br />

n represents the number of data points.<br />

xi represents a data point.<br />

X represents the mean of data.

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