Making Basic Measurements Using Spectrum Analyzer Mode

Comparing Signals Using Delta Markers

REF 48.8 dBm”

PEAK

LOG

10

dB/

MARKER

* STOP

 

WA SE

SC FC

CORR

Figure 4-13. Using the Marker to Peak/Peak Function

The frequency and amplitude differences between the signals appear in the active function block. In addition, the softkeys accessed by [E) appear on the screen.

Example: Measure the frequency and amplitude difference between two signals that do not appear on the screen at one time. (This technique is useful for harmonic distortion tests when narrow span and narrow bandwidth are necessary to measure the low-level harmonics.)

1.Connect the spectrum analyzer’s CAL OUT to the INPUT 75 61 (if you have not already done so). Press (jPRESETI), [FREQUENCY], 300 INIHz), (SPAN) and the step down key ((JJ) to narrow the frequency span until only one signal appears on the screen.

2.Press CPEAK SEARCH) to place a marker on the peak.

3.Press MARKER A to identify the position of the first marker.

4.Press [FREQUENCY] to activate center frequency. Turn the knob clockwise slowly to adjust the center frequency until a second signal peak is placed at the position of the second marker. It may be necessary to pause occasionally while turning the knob to allow a sweep to update the trace. The first marker remains on the screen at the amplitude of the Erst signal peak.

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