Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A - page 78

78 Chapter 2

Making Complex Measurements

Making Stimulus Response Measurements

NOTE To reduce ripples caused by source return loss, use 10 dB (E7401A) or 8

dB (all other models) or greater tracking generator output attenuation.

Tracking generator output attenuation is normally a function of the

source power selected. However, the output attenuation may be

controlled in the Source menu. Refer to specifications and

characteristics in your specif ications guide for more inform at i on on the

relationship between source power and source attenuation.

8. Put the sweep time of the analyzer into stimulus response auto

coupled mode by pressing Sweep, then Swp Cou pling (SR). Auto

coupled sweep times are usually much faster for stimulus response

measurements than they are for spectrum analyzer (SA)

measurements. Adjust the reference level if necessary to place the

signal on screen.

NOTE In the stimulus response mode, the Q of the DUT can determine the

fastest rate at which the analyzer can be swept. (Q is the quality factor ,

which is the center frequency of the DUT divided by the bandwidth of

the DUT.) To det ermine whether the analyzer is sweeping too fast, slow

the sweep and note whether there is a frequency or amplitude shift of

the trace. Continue to slow the sweep until there is no longer a

frequency or amplitude shift.

9. To activate the N dB bandwidth function press Peak Search, More,

then N dB Points (On). See Figure 2-6.

10.Read the measurement results displayed on the screen.

Figure 2-6 N dB Bandwidth Measurement at –3 dB

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: