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Anritsu S251B manual 4-11, SWR or Return Loss Measurement, Set the Amplitude Scale and Limit Line

Models: S251B

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SWR or Return Loss Measurement

Chapter 4 Measurements

SWR or Return Loss Measurement

Step 15. Disconnect the Load and connect the test port extension cable to the Site Master test port.

Step 16. Connect the Load to the open end of the test port extension cable as shown in Figure 4-9.

OPEN

SHORT CALIBRATION

LOAD

LOAD

SHORT

MEASUREMENT

RFOUT/REFLECTION

TEST PORT

Site Master S251B

1

START

CAL

3

SAVE

SETUP

5

LIMIT

7

SAVE

DISPLAY

9

625.0			2500.0
1384.45	MHz
2096.66	MHz		ON
			OFF
MODE	FREQ/DIST	AMPLITUDE	SWEEP

ESCAPE

2CLEAR

AUTO

SCALE

4

RECALL

SETUP

6

MARKER

ENTER

8

RECALL RUN

DISPLAY HOLD

0 +/-

PRINT

SYS

.

Figure 4-9. Cable Measurement Test Setup

Step 17. Observe the displayed measurement. Figures 4-10and 4-11show typical SWR and Return Loss measurements with markers and limit line set.

Set the Amplitude Scale and Limit Line

The following procedure sets the top and bottom scale display.

Step 18. Press the AMPLITUDE or LIMIT key to call up the Scale Menu.

Step 19. In SWR mode, press the TOP soft key and enter 1, ., 3 using the keypad or Up/Down arrow key. Press ENTER to set the top scale. (In Return Loss mode, enter 0.)

Step 20. In SWR mode, press the BOTTOM soft key and enter 1 using the keypad or Up/Down arrow key. Press ENTER to set the bottom scale. (In Return Loss mode, enter 5, 4.)

Step 21. Press the LIMIT soft key to activate the segment limit line table.

Step 22. Use the Up/Down arrow key to scroll to segment #1 and press the EDIT SEGMENT soft key to change the parameter values for segment #1.

Step 23. Use the Up/Down arrow key to scroll to the START FREQ parameter and press ENTER to edit the value.

4-11

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Anritsu S251B manual 4-11, SWR or Return Loss Measurement, Set the Amplitude Scale and Limit Line, Measurements

Contents

Site Master Model S251B Antenna and Cable AnalyzerUsers Guide LIMITATION OF WARRANTY WARRANTYTRADEMARK ACKNOWLEDGMENTS NOTICEPage Chapter 2 - Getting Started Chapter 1 - General InformationChapter 3 - Functions and Operations Chapter 4 - MeasurementsSWR Return Loss and Cable Loss Measurement Making Power MeasurementsDTF Measurement 4-16iii/iv Chapter 5 - Software Tools ProgramAppendix A - Reference Data Chapter General Information Standard AccessoriesIntroduction DescriptionOptional Accessories OptionsChapter 1 General Information Chapter 1 General Information Performance SpecificationsChapter 1 General Information Table 1-1. Performance Specifications 1 ofDescription Site Master ValueChapter 1 General Information Table 1-2. Performance Specifications 2 ofChapter 1 General Information Preventive MaintenanceCalibration Annual VerificationChapter 1 General Information Chapter 1 General Information Table 1-2. Anritsu Service CentersCharging the Battery in the Site Master Charging a New BatteryCharging the Battery in the Optional Charger Chapter Getting StartedBattery Charge Indicator Chapter 2 Getting StartedBattery Indicator Battery Life Discharging the NiMH BatteryImportant Battery Information Chapter 2 Getting StartedChapter 2 Getting Started Use only Anritsu approved battery packsFront Panel Overview Chapter Functions and OperationsIntroduction SOFT KEYSBattery Test Connector PanelPower Chapter 3 Functions and OperationsAUTO Keypad ControlsSCALE ENTERPRINT SETUPRECALL DISPLAYUp/Down SWEEPArrow Key Chapter 3 Functions and OperationsFREQ/DIST Soft KeysAMPLITUDE SWEEPChapter 3 Functions and Operations MODE=POWER MONITOR SOFTKEYSUNITS OFFSETFREQ/DIST AMPLITUDESWEEPChapter 3 Functions and Operations MARKER Chapter 3 Functions and OperationsMARKER TO PEAK MARKER TO VALLEY MARKER TO PEAK MARKER TO VALLEYChapter 3 Functions and Operations 3-10ABC DEF GHI JKL MNO PQR STU VWX BACK SPACE3-11 Chapter 3 Functions and OperationsFREQ/DIST Displays the frequency or distance menu depending on the measurement mode 3-12 Chapter 3 Functions and OperationsBACK — Returns to the Distance Menu Chapter 3 Functions and Operations 3-13Figure 3-9.Rectangular Windowing Example Figure 3-10.Nominal Side Lobe Windowing ExampleChapter 3 Functions and Operations 3-14Figure 3-11.Low Side Lobe Windowing Example Figure 3-12.Minimum Side Lobe Windowing ExampleAMPLITUDE 3-15Amplitude Menu3-16 Chapter 3 Functions and OperationsBACK — Return to the Sweep menu 3-17 Chapter 3 Functions and OperationsALL OFF — Turns all markers off Clock 3-18Chapter 3 Functions and Operations Sub-MenuChapter 3 Functions and Operations 3-19RECALL DISPLAYPower Monitor Menu 3-20Chapter 3 Functions and Operations 3-21 PrintingPrinting a Screen OPTIONS3-22 Printer Switch SettingsPRINTER PRINTSelf Test Symbols3-23 SymbolSelf Test Errors Error Codes3-24 vice Center3-25 Range ErrorsMaximumUnaliased Range Vf is the relative propagation velocity3-26 Chapter 3 Functions and OperationsCANNOT ZERO Chapter 3 Functions and Operations 3-27Using the Soft Carrying Case 3-28Chapter 3 Functions and Operations Chapter Measurements Measurement FunctionsIntroduction Power On Procedure Calibration ProcedureChapter 4 Measurements Selecting the Frequency Range Performing a CalibrationChapter 4 Measurements Saving the Setup Setting the Amplitude ScaleRecalling a Setup Chapter 4 MeasurementsSaving a Display to Memory Recalling a Display From MemoryChapter 4 Measurements Chapter 4 Measurements Figure 4-6.Insertion Loss Mode Calibration Results Loads at RF Out and RF In Chapter 4 MeasurementsNOTES: For best calibration results–compensationfor all measurement system uncertainties–ensurethat the Open/Short/Load is at the end of the test port or optional extension cable; that is, at the same point as the antenna or device to be tested will be connected Chapter 4 MeasurementsProcedure Device-Under-TestSpecificationSWR Return Loss and Cable Loss Measurement Required EquipmentPerforming a Calibration 4-10Chapter 4 Measurements NOTESSWR or Return Loss Measurement 4-11Set the Amplitude Scale and Limit Line Figure 4-9.Cable Measurement Test Setup4-12 Step 24. Enter 6, 2, 5 using the key pad or the Up/Down arrow key. Press ENTER to set the Start Frequency to 625 MHzChapter 4 Measurements Setting the Markers 4-13Chapter 4 Measurements 4-14 Setting the Segment Limit LInesCable Loss Measurement Setting the Amplitude Scale4-15 Chapter 4 MeasurementsFigure 4-12.Cable Loss Measurement Results DTF Measurement 4-16Device-Under-TestSpecification ProcedurePerforming a Calibration 4-17Chapter 4 Measurements Step 13. Press ENTER to start the calibration4-18 Setting the MarkerSetting the Amplitude Scale Chapter 4 Measurements4-19 Chapter 4 MeasurementsFigure 4-13.DTF - SWR Measurement Results cable length Setting the Amplitude Scale 4-20Setting the Markers Chapter 4 Measurements4-21 Chapter 4 MeasurementsFigure 4-15.DTF - SWR Measurement Results cable quality Insertion Gain Amplifier Measurement 4-22Selecting the Measurement Device-Under-TestSpecificationChapter 4 Measurements 4-23TEST PORT CABLE OPTIONALAmplifier Gain Measurement 4-24Setting the Markers Figure 4-20.Amplifier Gain Measurement SetupActivating the Bias Tee 4-25Setting the Amplitude Scale Chapter 4 Measurements4-26 Chapter 4 MeasurementsFigure 4-22.Measurement Display of Amplifier Gain Entering Power Monitor Mode Making Power MeasurementsZeroing the Power Monitor Measuring High Input Power LevelsChanging COM Port Settings–Windows95/98/NT Communication Port SettingChapter Software Tools Program RequirementsChapter 5 Software Tools Program Software Installation Plot CaptureChapter 5 Software Tools Program Capture single or multiple traces to PC screen Capture multiple traces to a databaseCOM port Program defaults to COM2 Serial InterfaceSaving a Custom Cable List Custom Cable List Uploading and DownloadingSmith Chart Software Fault Location SoftwareProgram Operation Chapter 5 Software Tools ProgramSaving Data to a Database Pasting a Plot in Graphic or Spreadsheet For- mat“Drag-n-Drop” Chapter 5 Software Tools ProgramEach cable/antenna tends to have a unique Distance-To-FaultDTF “Signature” because differing cable electrical lengths, cable types, dielectric thickness variations, and the posi- tions of components connectors, adapters, and lightning arresters will cause different re- flections at differing positions in the transmission line. Variations in the “signature” between maintenance intervals offer a good indication of damage or damage causing condi- tions PrintingChapter 5 Software Tools Program Appendix A Reference Data Coaxial Cable Technical DataCable Type Relative Propagation Velocity VfCable Type Appendix A Reference DataRelative Propagation Velocity Vf Nominal Attenuation