Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A Identifying Distortion Products

42 Chapter 1

Making Basic Measurements

Identifying Distortion Products

Identifying Distortion Products

Distortion from the Analyzer

High level input signals may cause analyzer distortion products that

could mask the real distortion measured on the input signal. Using

trace 2 and the RF attenuator, you can determine which signals, if any,

are internally generated distortion products.

Identifying Analyzer Generated Distortion Example:

Using a signal from a signal gene ra tor, determine whether the

harmonic distortion products are generated by the analyzer.

1. Connect a signal generator to the analyzer INPUT.

2. Set the signal generator frequency to 200MHz and the amplitude to

0dBm.

3. On the analyzer, perform a factory preset by pressing Preset,

Factory Preset (if present).

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

Y-AxisUnits, dBm .

5. Set the resolution bandwidth to spectrum analyzer coupling by

pressing BW/Avg, Res BW (SA).

6. Set the center frequency of the analyzer to 400MHz by pressing

FREQUENCY, Center Freq, 400, MHz.

7. Set the span to 5 0 0 MHz by pres sing SPAN, Span, 500, MHz.

The signal produces harmonic distortion products in the analyzer

input mixer as shown in Figure1-34.

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: