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Anritsu S251B manual 4-27/4-28, Making Power Measurements, Entering Power Monitor Mode

Models: S251B

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Making Power Measurements

Chapter 4 Measurements

Making Power Measurements

Power measurement is accomplished using a broadband (1 MHz to 3000 MHz) RF detector, P/N 5400-71N50. The power monitor displays measured power in dBm or Watts.

Entering Power Monitor Mode

Step 1. Press the MODE key.

Step 2. Use the Up/Down arrow key to scroll to POWER MONITOR. Press ENTER to select power monitor mode.

Zeroing the Power Monitor

Step 3. With no power applied to the DUT, press the ZERO soft key from the Power menu. Wait a few seconds while the Site Master accumulates samples of the qui- escent power level. When complete, ZERO ADJ: ON is displayed in the message area.

Measuring High Input Power Levels

Step 4. Insert an attenuator between the DUT and the RF detector, sufficient to insure that the input power to the Site Master is no greater the 20 dBm.

Step 5. Press the OFFSET soft key.

Step 6. Enter the attenuation in dB using the keypad. Press ENTER to complete the en- try. The message area will show OFFSET is ON along with the entered value in dB.

Displaying Power in dBm and Watts

Step 7. Press the UNITS soft key to display power in Watts.

Displaying Relative Power

Step 8. With the desired base power level input to the Site Master, press the REL soft key. The message area will show REL: ON and the power reading will indicate 100%.

Step 9. Press the UNITS soft key to display power in dBm. Since REL is ON, the power reading will be in dBr, relative to the base power level.

4-27/4-28

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Anritsu S251B manual 4-27/4-28, Making Power Measurements, Entering Power Monitor Mode, Zeroing the Power Monitor

Contents

Cable Analyzer Site Master Model S251B Antenna andUsers 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 4-16Chapter 5 - Software Tools Program iii/ivAppendix A - Reference Data Chapter General Information Standard AccessoriesIntroduction DescriptionOptions Optional AccessoriesChapter 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 MaintenanceAnnual Verification CalibrationChapter 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 StartedChapter 2 Getting Started Battery Charge IndicatorBattery 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 OFFSETAMPLITUDESWEEP FREQ/DISTChapter 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 SPACEChapter 3 Functions and Operations 3-11FREQ/DIST Displays the frequency or distance menu depending on the measurement mode Chapter 3 Functions and Operations 3-12BACK — 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 MenuChapter 3 Functions and Operations 3-16BACK — Return to the Sweep menu Chapter 3 Functions and Operations 3-17ALL OFF — Turns all markers off Clock 3-18Chapter 3 Functions and Operations Sub-MenuChapter 3 Functions and Operations 3-19RECALL DISPLAY3-20 Power Monitor MenuChapter 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 velocityChapter 3 Functions and Operations 3-26CANNOT ZERO Chapter 3 Functions and Operations 3-273-28 Using the Soft Carrying CaseChapter 3 Functions and Operations Measurement Functions Chapter MeasurementsIntroduction Calibration Procedure Power On ProcedureChapter 4 Measurements Performing a Calibration Selecting the Frequency RangeChapter 4 Measurements Saving the Setup Setting the Amplitude ScaleRecalling a Setup Chapter 4 MeasurementsRecalling a Display From Memory Saving a Display to 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 SetupStep 24. Enter 6, 2, 5 using the key pad or the Up/Down arrow key. Press ENTER to set the Start Frequency to 625 MHz 4-12Chapter 4 Measurements 4-13 Setting the MarkersChapter 4 Measurements 4-14 Setting the Segment Limit LInesCable Loss Measurement Setting the Amplitude ScaleChapter 4 Measurements 4-15Figure 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 MeasurementsChapter 4 Measurements 4-19Figure 4-13.DTF - SWR Measurement Results cable length Setting the Amplitude Scale 4-20Setting the Markers Chapter 4 MeasurementsChapter 4 Measurements 4-21Figure 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 MeasurementsChapter 4 Measurements 4-26Figure 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 Plot Capture Software InstallationChapter 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 ProgramPrinting Each 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- tionsChapter 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