Agilent Technologies E7401A, E7402A, E7403A, E7404A, E7405A Measuring Low Level Signals Example 2:

36 Chapter 1

Making Basic Measurements

Measuring Low Level Signals

12.To see the signal more clearly, enter 0 dB. Zero decibels of

attenuation makes the signal more visible. See Figure1- 28.

Figure 1-28 Using 0 dB Attenuation

CAUTION Before connecting other signals to the analyzer input, increase the RF

attenuation to protect the analyzer input: press Attenuation so that Auto

is underlined or press Auto Couple.

Measuring Low Level Signals Example 2:

The resolution bandwidth can be decreased to view low level signals.

1. Connect a signal generator to the analyzer input.

2. Set the signal generator frequency to 300M Hz with an amplitude of

−80 dBm.

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

Factory Preset (if prese nt).

4. Set the center frequency of the analyzer to 300MHz by pressing

FREQUENCY, Center Freq, 300, MHz.

5. Set the span to 5 MHz by pressing SPAN, Span, 5, MHz.

6. Set the resolution bandwidth to spectrum analyzer coupling by

pressing BW/Avg, Res BW (SA).

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

Y-AxisUnits, dBm .

8. Set the reference level to −40dB m by pressing AMPLITUDE, Ref Level,

–40, dBm.

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: