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

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PEAKS Peaks<br />

47<br />

REF .0 dBm ATTEN 1 0 dB<br />

MKR 608 MHz<br />

-42.23 dBm<br />

PEAK<br />

1 LY” ne 1<br />

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<br />

2,<br />

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<br />

MARKER<br />

608 YHz<br />

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<br />

- 4 2 . 2 3 dBm<br />

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<br />

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<br />

WF, S B<br />

SC FS<br />

CORR’<br />

i<br />

: ; : ; : ; : : !<br />

TH<br />

-60 .0 . . . . . . . . . . . . . . . . . . . . . . . . . ..t......................................................................<br />

dBm<br />

I I<br />

CENTER 300 MHz<br />

tRES B W 3 0 kHz UBW 3 0 kHz<br />

SPAN 1.500<br />

SWP 5.00<br />

8Hz<br />

set R<br />

Figure 5-9. Frequency <strong>and</strong> Amplitude of the Peaks<br />

If the FRQ parameter is used with the PEAKS comm<strong>and</strong>, the programming example returns the<br />

values that shown in the following table.<br />

Trace Element<br />

TRB[ l]<br />

TRB[2]LTRB[3]<br />

TRB[4]<br />

TRB[S]<br />

If the AMP parameter is used with the PEAKS comm<strong>and</strong>, the programming example returns<br />

the values that are shown in the following table.<br />

Trace Element Amplitude Frequency<br />

TRB[l] -13.95 4.E+6<br />

TRB[S] -28.14 3.04E+8<br />

TRB[J] -28.89 -2.963+8<br />

TRB[4] -32.6 9.07E + 8<br />

TRB[B] -42.23 6.08+8<br />

Notice that MKA? <strong>and</strong> MKF? are used to determine the amplitude <strong>and</strong> frequency of the peak<br />

position.<br />

PEAKS sorts only signals that are above the threshold value. To be classified as a signal peak,<br />

a signal must be MKPX above the threshold value <strong>and</strong> it must rise <strong>and</strong> fall at least the peak<br />

excursion (MKPX value). To change the threshold, use the TH comm<strong>and</strong> before PEAKS is<br />

executed.<br />

If necessary, the last sorted value is repeated to fill remaining elements of the destination trace.<br />

PEAKS must be used as either a query or as a source in another spectrum analyzer-comm<strong>and</strong><br />

function. Form a query by ending the PEAKS statement with a “?.” When used as a query,<br />

PEAKS returns the number of peaks found. When querying the trace elements of destination<br />

trace, the x-axis coordinate (relative to the first trace element) of the peak is returned.<br />

5-426 Programming Comm<strong>and</strong>s

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