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Agilent Technologies 8712ET User Manual

Agilent Technologies 8712ET
152 pages
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Contents
vii
1. Introduction and Measurement Theory
Fault Location Measurement Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
How the Analyzer Converts Frequency Data to Distance Data . . . . . . . . . . . . . . . . 1-4
Start/Stop Distance and Frequency Span Explanation . . . . . . . . . . . . . . . . . . . . . . . 1-5
Cable Impedance and Structural Return Loss Measurement Theory . . . . . . . . . . . . . 1-6
Cable Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
SRL and Periodic Cable Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
SRL and Discrete Cable Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Techniques for Removing Connector Effects. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Measurement Uncertainties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
2. Cable Preparation
Cable Preparation Problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Bent Cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Deformed Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Contaminated Dielectric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Damaged Outer Conductor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Non-Flush Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Recommended Tools and Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Recommended Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
3. Making Fault Location Measurements
How to Make and Interpret Fault Location Measurements . . . . . . . . . . . . . . . . . . . . . 3-3
1. Select Fault Location as the Type of Measurement . . . . . . . . . . . . . . . . . . . . . . . . 3-4
2. Enter the Measurement Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3. Calibrate the Analyzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
4. Connect the Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
5. Interpret the Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Example Fault Location Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Example 1: Identify Mismatches Expressed as Return Loss. . . . . . . . . . . . . . . . . . 3-14
Example 2: Identify Mismatches as the Magnitude of Reflection Coefficient. . . . . 3-16
Example 3: Identify Mismatches at Greater Distances . . . . . . . . . . . . . . . . . . . . . . 3-17
4. Making SRL Measurements
How to Make and Interpret SRL Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

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Agilent Technologies 8712ET Specifications

General IconGeneral
BrandAgilent Technologies
Model8712ET
CategoryMeasuring Instruments
LanguageEnglish

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