Agilent Technologies Agilent 8163A

Return Loss Measurement
164 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition
Getting Started With Return Loss . . . . . . . . . . . . . . . . . . .165
What is Return Loss? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
What is Insertion Loss? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
Equipment required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .166
How to Choose a Light Source . . . . . . . . . . . . . . . . . . . . . . . . . .167
Return Loss Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168
Calibration Measurements. . . . . . . . . . . . . . . . . . . . . . . . .170
Return Loss Measurement. . . . . . . . . . . . . . . . . . . . . . . . .171
Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172
Calibrating the Return Loss Module . . . . . . . . . . . . . . . . . . . . .176
Calibration using the Agilent 81000BR Reference Reflector .177
Calibration using the Agilent 81610CC Reference Cable . . . .180
How to Measure Return Loss . . . . . . . . . . . . . . . . . . . . . . . . . . .184
Viewing the Calibration Values. . . . . . . . . . . . . . . . . . . . . . . . . .186
A Background to Return Loss Measurement . . . . . . . . .189
Measuring the Reflected Power from a Component with Known
Reflection Factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
Measuring the Power Transmitted Through the Reflection
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
Measuring the Power when there are No Reflections . . . . . .190
Measuring the Power Transmitted Through the Measurement
Patchcord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
Measuring the Reflections from the DUT . . . . . . . . . . . . . . . . .191
Measuring the Power Transmitted Through the DUT . . . . . . .192
Calculating the Return Loss of the DUT . . . . . . . . . . . . . . . . . .192
Calculating the Front Panel Delta. . . . . . . . . . . . . . . . . . . . . . . .195
Calculating the Insertion Loss of the DUT . . . . . . . . . . . . . . . .196