Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A Comparing Signals

10 Chapter 1

Making Basic Measurements

Comparing Signals

Comparing Signals

Using the analyzer, you can easily compare frequency and amplitude

differences between signals, such as radio or television signal spectra.

The analyzer delta marker function lets you compare two signals when

both appear on the screen at one time or when only one appears on the

screen.

Signal Comparison Example 1:

Measure the differences between two signals on the same display

screen.

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

present).

2. Connect the 10 MHz REF OUT from the rear panel to the

front-panel INPUT.

3. Set the center frequency to 30MHz by pressing FREQUENCY,

Center Freq, 30, MHz.

4. Set the span to 50 MHz by pressing SPAN, Span, 50, MHz.

5. Set the resolution bandwidth to spectrum analyzer coupling by

pressing BW/Avg, Res BW (SA).

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

Y-AxisUnits, dBm .

7. Set the reference level to 10dBm by pressing AMPLITUDE, RefLevel,

10, dBm.

The 10 MHz reference signal appears on the display.

8. Press Peak Search to place a marker at the highest peak on the

display. (The Next Pk Right and Next Pk Left softkeys are available to

move the marker from peak to peak.) The marker should be on the

10 MHz reference signal. See Figure1-1.

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: