Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A Decreasing the Frequency Span Around the Signal

24 Chapter 1

Making Basic Measurements

Decreasing the Frequency Span Around the Signal

Decreasing the Frequency Span Around the Signal

Using the analyzer signal track function, you can quickly decrease the

span while keeping the signal at center frequency. This is a fast way to

take a closer look at the area around the signal to identify signals that

would otherwise not be resolved.

Decreasing the Frequency Span Example:

Examine a signal in a 200 kHz span.

1. Perform a factory preset by pressing Preset, Factory Preset (if

present).

2. Turn on the internal 50MHz amplitude reference signal of the

analyzer as follows:

•For the E7401A, use the internal 50MHz amplitude reference

signal of the analyzer as the signal b eing measured. Press

Input/Output, Amptd Ref (On).

•For all other models connect a cable between the front-panel

AMPTD REF OUT to the analyzer INPUT, then press

Input/Output, Amptd Ref Out (On).

3. Set the start frequency to 20MHz by pressing FREQUENCY,

StartFreq, 20, MH z.

4. Set the stop frequency to 1GHz by pressing FREQUENCY, Stop Fre q,

1, GHz.

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

Y-AxisUnits, dBm .

6. Set the resolution bandwidth to spectrum analyzer coupling pressing

BW/Avg, Resolution BW (SA).

7. Press Peak Search to place a marker at the peak. See Figure1-14.

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: