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

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PKZOOM Peak Zoom<br />

Description<br />

PKZOOM finds the highest displayed signal <strong>and</strong> narrows the frequency span to the specified<br />

value. PKZOOM ignores the spectrum analyzer’s local oscillator (LO) feedthrough signal.<br />

PKZOOM sets the reference level to the signal’s amplitude, sets the center frequency step<br />

size to the signal’s frequency, <strong>and</strong> if the signal is within a preselected b<strong>and</strong>, performs the<br />

preselector peak routine (<strong>HP</strong> 8592L, <strong>HP</strong> 85933, <strong>HP</strong> 85953, or <strong>HP</strong> 85963 only). The minimum<br />

value for the final frequency span depends on the model of the spectrum analyzer.<br />

<strong>Spectrum</strong> Analyzer Frequency Span<br />

Model<br />

<strong>HP</strong> 859OL or <strong>HP</strong> 8592L 500 kHz<br />

<strong>HP</strong> 85913, <strong>HP</strong> 85933, <strong>HP</strong> 85943, <strong>HP</strong> 85953, or <strong>HP</strong> 85963 10 kHz<br />

<strong>HP</strong> 85913, <strong>HP</strong> 85933, <strong>HP</strong> 85943, <strong>HP</strong> 85953, or <strong>HP</strong> 85963 with Option 130 300 Hz<br />

‘lb be able to find a valid signal, PKZOOM changes the following comm<strong>and</strong>s:<br />

TH Sets the threshold to 8 divisions from the top screen.<br />

LG Changes the amplitude scale to logarithmic.<br />

MKPX Sets the peak excursion to 6 dB.<br />

VAVG Sets video averaging to off.<br />

AT, RB, VB, ST Attenuation, resolution b<strong>and</strong>width, video b<strong>and</strong>width, <strong>and</strong> sweeptime are<br />

autocoupled.<br />

MKSS The center frequency step size is set to the marker’s frequency.<br />

For a signal to be found by PKZOOM, the signal must have a peak excursion (rise <strong>and</strong> fall) of at<br />

least 6 dB.<br />

Restrictions<br />

Executing PKZOOM turns off the following functions: windows display mode (WINON), N<br />

dB point measurement (NDBPNT), the FF”I’ menu measurements (FF’IAUTO, FFTCONTS,<br />

FFTSNGLS), gate utility functions (GDRVUTIL), TO1 measurement (TOI), marker table (MKTBL),<br />

peak table (PKTBL), percent AM (PCTAM), <strong>and</strong> power menu measurements (ACP, ACPE, C<strong>HP</strong>,<br />

<strong>and</strong> OBW).<br />

Query Response<br />

5-438 Programming Comm<strong>and</strong>s<br />

termination ---)<br />

001

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