Agilent Technologies 11867A? Manuel de service télécharger pdf (Page 95)

Chapter 5 97

Spectrum Analyzer

Making Distortion Measurements

Spectrum Analyzer

Your display should be similar to Figure 5-20.

Figure 5-20 Harmonic Distortion with 0 dB Attenuation

Step 10. To determine whether the harmonic distortion products are generated

by the analyzer, first save the screen data in trace 2 as follows:

Press

Trace/Detector, Select Trace (2), then Clear Write.

Allow the trace to update (two sweeps) and press

Trace/Detector, Update

Off (View)

, Marker, Delta.

The analyzer display shows the stored data in trace 2 and the measured

data in trace 1.

Step 11. Next, increase the RF attenuation by 10 dB: press AMPTD Y Scale, Elec

Atten

, 10, dB. See Figure 5-21.

Notice the ∆Mkr1 amplitude reading. This is the difference in the

distortion product amplitude readings between 0 dB and 10 dB input

attenuation settings. If the ∆Mkr1 amplitude absolute value is

approximately ≥1 dB for an input attenuator change, then distortion is

being generated, at least in part, by the analyzer. In this case more

input attenuation is necessary.

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Agilent Technologies 11867A? Manuel de service Page 95