Making Basic Measurements

Demodulating FM Signals

4.Set the span to 1 MHz by pressing SPAN, Span, 1, MHz.

5.Set the Y-Axis Units to dBm by pressing AMPLITUDE, More, Y-Axis Units, dBm.

6.Set the reference level to –20 dBm by pressing AMPLITUDE, Ref Level,

–20, dBm.

7.Set the resolution bandwidth to 100 kHz by pressing BW/Avg,

Res BW, 100, kHz. The skirt is reasonably linear starting approximately 5 dB below the peak.

8.Select a marker by pressing Marker, then move the marker approximately 1/2 division down the right of the peak (high frequency) using the front-panel knob.

9.Place a delta marker 150 kHz from the first marker by pressing

Delta, 150, kHz. The skirt looks reasonably linear between markers.

10.Determine the offset from the signal peak to the desired point on the filter skirt by moving the delta marker to the midpoint. Press 75, kHz to move the delta marker to the midpoint. See Figure 1-56.

Figure 1-56 Establishing the Offset Point

11.Press Delta to make the active marker the reference marker.

12.Press Peak Search to move the delta marker to the peak. The delta value is the desired offset, for example 151 kHz. See Figure 1-57.

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Chapter 1

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Agilent Technologies E7402A, E7405A, E7404A, E7403A, E7401A manual Establishing the Offset Point
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E7402A, E7405A, E7404A, E7401A, E7403A specifications

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