Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A - page 44

44 Chapter 1

Making Basic Measurements

Identifying Distortion Products

12.To determine whether the harmonic distortion products are

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

follows:

a. Press Trace/View, Trace (2), then Clear Write.

b. Allow the trace to update (two sweeps) and press Trace/View, View,

Marker, Delta. The analyzer display shows the stored data in trace

2 and the measured data in trace 1.

13.Next, increase the RF attenuation by 10dB: press AMPLITUDE,

Attenuation, and the step-up key (↑) twice. See Figure1-36.

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

distortion product amplitude readings between 0dB and 10 dB input

attenuation s ettings. If the ∆Mkr1 amplitud e a bsolute value is

approximately ≥1 dB for an input attenuator change, the distortion

is being generated, at least in par t, by the analyzer. In this case more

input attenuation is necessary.

Figure 1-36 RF Attenuation of 10 dB

14.Press Peak Search, Marker, Delta

Change the attenuation to 15dB by pressing Attenuation, 15, dB.

If the ∆Mkr1 amplitude absolute value is approxim at e ly ≥1dB as

seen in Figure1-36, then more input attenuation is required; some

of the measured distortion is internally generated. If there is no

change in the signal level, the distortion is not generated internally.

For example, the signal that is causing the distortion shown in

Figure1-37 is not high enough in amplitude to cause internal

distortion in the analyzer so any distortion that is displayed is

present on the input signal.

Contents

Main Signal Analysis Measurement Guide Agilent Technologies EMC Series Analyzers Notice Safety Information Warrant y LIMITATION OF WARRANTY EXCLUSIVE REMEDIES Where to Find the Latest Informa tion Page Contents Page What is in This Chapter Test Equ ipm ent Comparing Signals Signal Comparison Example 1: Page Signal Comparison Example 2: Page Resolving Signals of Equal Amplitude Resolving Signals Example: Page Page Resolving Small Signals Hidden by Large Signals Resolving Signals Example: Page Page Making Better Frequency Measurements Better Frequency Measurement Example: Page Decreasing the Frequency Span Around the Signal Decreasing the Frequency Span Example: Page Page Tracking Drifting Signals Tracking Signal Drift Example 1: Page Page Tracking Signal Drift Example 2: Page Page Page Measuring Low Level Signals Measuring Low Level Signals Example 1: Page Measuring Low Level Signals Example 2: Measuring Low Level Signals Example 3: Page Measuring Low Level Signals Example 4: Page Page Identifying Distortion Products Distortion from the Analyzer Identifying Analyzer Generated Distortion Example: Page Page Third-Order Intermodulation Distortion Identifying TOI Distortion Example: Page Page Page Measuring Signal-to-Noise Signal-to-Noise Measurement Example: S/N 70 dB/Hz10 30 kHz()log+ 25.23 dB30 kHz()== Making Noise Measurements Noise Measurement Example 1: Page Page Page Page Noise Measurement Example 2: Noise Measurement Example 3: Page Page Demodulating AM Signals (Using the Analyzer As a Fixed Tuned Receiver) Demodulating an AM Signal Example 1: Page Page Page Page Page Demodulating FM Signals Demodulating a FM Signal Example: Page Page Page Page Whats in This Chapter Required Test Equipment Making Stimulus Response Measu rements What Are Stimulus Response Measurements? Using An Analyzer With A Tracking Generator Stepping Through a Transmission Measurement Page Page Page Page Tracking Generator Unleveled Condition Measuring Device Bandwidth Page Page Measuring Stop Band Attenuation Using Log Sweep Page Page Page Page Making a Reflection Calibration Measurement Example: Reflection Calibration Measuring the Return Loss Chapter 2 87 VSWR 110 Making Complex Measurements Making a Reflection Calibration Measurement -----------------------= Table 2-1 Power to VSWR Conversion + 110 Demodulating and Listening to an AM Signal Demodulating and Listening to an AM Signal Example 1: Demodulating and Listening to an AM Signal Example 2: