Agilent Technologies 8720ET, ES, 8722ET Measuring S11 and S22 or Reflection in a Polar Format

Page 53

Quick Start: Learning How to Make Measurements

Learning to Make Reflection Measurements

Measuring S11 and S22 or Reflection in a Polar Format.

1.Press Format POLAR .

2.Press Scale Ref AUTO SCALE to reposition the trace, as shown in Figure 2-14.

The analyzer shows the results of an S11 or reflection measurement with each point on

the polar trace corresponding to a particular value of both magnitude and phase. The center of the circle represents a coefficient (Γ) of 0, (that is, a perfect match or no

reflected signal). The notation 2U FS or 2 units full scale indicates that the outermost circumference of the scale shown in Figure 2-14represents ρ = 2.00, or 200% reflection. The phase angle is read directly from this display. The 3 o'clock position

corresponds to zero phase angle, (that is, the reflected signal is at the same phase as the incident signal). Phase differences of 90°, 180°, and −90° correspond to the 12 o'clock, 9 o'clock, and 6 o'clock positions on the polar display, respectively.

3. Press Marker Fctn MARKER MODE MENU POLAR MKR MENU .

4.Turn the front panel knob to position the marker at any desired point on the trace, then read the frequency, linear magnitude and phase in the upper right-hand corner of the display.

Choose LIN MKR if you want the analyzer to show the linear magnitude and the phase of the marker.

Choose LOG MKR if you want the analyzer to show the logarithmic magnitude and the phase of the active marker. This is useful as a fast method of obtaining a reading of the log-magnitude value without changing to log-magnitude format.

Choose Re/Im MKR if you want the analyzer to show the values of the marker as a real and imaginary pair.

NOTE

You can also enter the frequency of interest, from either the numeric keypad

 

or the optional attached keyboard, and read the magnitude and phase at that

 

point.

 

 

Figure 2-14 Example S11 or Reflection Measurement Trace in Polar Format

2-20

Chapter 2

Image 53
Contents Part Number Print Date February Installation and Quick Start GuidePage Certification General Safety Considerations How to Use This Guide Documentation Map Contents Installing Your Analyzer Introduction Verify the Shipment Item Number Part Number Description Analyzer Front Panel Familiarize Yourself with the Analyzer Front and Rear PanelsTest Sequence Analyzer Rear PanelMeet Electrical and Environmental Requirements Meet Electrical and Environmental Requirements Configure the Analyzer To Configure the Standard Analyzer To Configure the Analyzer with Printers or Plotters Plotter Port Configure the Analyzer Thinkjet Deskjet SET Clock To Configure the Analyzer for Bench Top or Rack Mount Use To Attach Front Handles to the Analyzer Standard Configure the Analyzer Configure the Analyzer Verify the Analyzer Operation To View the Installed Options To Initiate the Analyzer Self-Test To Run the Operators Check Service Menu TestsTransmissn To Test the Transmission ModeMeas Refl REV S22 B/R To Test the Reflection ModeBack Up the Eeprom Disk Eeprom Backup Disk ProcedureDescription EquipmentBack Up the Eeprom Disk Quick Start Learning How to Make Measurements Quick Start Learning How to Make Measurements Analyzer Front Panel Analyzer Front PanelAnalyzer Front Panel Make a measurement calibration Measurement ProcedureMeasure the device Output measurement resultsDevice Connections for a Transmission Measurement Learning to Make Transmission MeasurementsConnections for a Thru Calibration Standard Perform a measurement calibrationExample Measurement of Insertion Loss Press Return Define DISK-SAVE Example Measurement of 3 dB Bandwidth Measuring Other Transmission CharacteristicsExample Measurement of Out-of-Band Rejection Measuring Out-of-Band RejectionExample Measurement of Passband Flatness or Ripple Measuring Passband Flatness or Ripple= 1 + ρ / 1 − ρ Learning to Make Reflection Measurements= Γ Connections for Reflection Measurements Make a measurement calibration 10 Example Measurement of Return Loss Measuring Return Loss11 Example Measurement Title Measuring Reflection Coefficient Measuring Other Reflection Characteristics13 Example Standing-Wave-Ratio Measurement Trace Measuring Standing Wave Ratio SWRMeasuring S11 and S22 or Reflection in a Polar Format Measuring S11 and S22 or Reflection in a Smith Chart Format 15 Example Impedance Measurement Trace If the analyzer display does not light If You Encounter a ProblemPower-Up Problems No RF Output Data Entry ProblemsIf there is no RF signal at the front-panel port If You Encounter a Problem European Field Operations Agilent Technologies Sales and Service OfficesIndex Index
Related manuals
Manual 63 pages 28.88 Kb