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HP 85719A Noise Figure Measurements Personality User's Guide

1. Turn on noise figure mea surements personality mode Set all of the measurement parameters to the default values Set the number of mea surement points to 3 Calibrate the measurement setup Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed 6 56 Programming PTS 90 OUTPUT 718 _MEASURE Make a calibrated noise figure and gain measurement 100 END Query Response The response displays the current number of points selected output Figure 6 41 PTS Query Response Syntax apts Programming _RFSTART Use the _RFSTART command to enter the RF start frequency for a frequency conversion noise figure and gain measurement frown start frequency 4 pzas la KHZ j MHZ GHZ xrfsta Figure 6 42 _RESTART Syntax Description Default Value 3 70 GHz Default Units HZ Range 0 0 Hz to 999 GHz Prerequisite Command _NFMODE Related Commands FCONV _IFSTART _IFSTOR _RFSTOP Description Use the RFSTART command to set or query the RF start frequency value The RF start and stop frequency span must match the IF stop and start frequency span Frequency conversion needs to be selected for these values to be active 6 58 Example Program 20 OUTPUT 718 _NFMODE 25 OUTPUT 718 _DEFAULTS 30 OUTPUT 718 _FCONV 1 35 OUTPUT 718 _LABEL 40 OUTPUT 71
2. MEASURE 100 END Turn on noise figure mea surements personality mode Set all of the measurement parameters to the default values Set the number of mea surement points to 3 Calibrate the measurement setup Query the spectrum ana lyzer for the calibration routine status Get the status condition Displa y the calibration done message Wait for the key to be pressed Make a calibrated noise figure and gain measurement 6 14 Programming _CONN _CONN The _CONN command is used to control external hardware relays etc via the auxiliary interface connector VARDEF Co CONC TF Q Co Figure 6 7 CONN Syntax Related Commands _NFMODE CAL Description When the auxiliary interface connector is enabled VARDEF _CONN 1 the voltage on control line C CNTLC is changed to a transistor transistor logic TTL high level when in NFMODE and returns to a low level when in spectrum analyzer mode The voltage on control line D CNTLD is changed to a TTL high level when a NF calibration is performed and returns to a low level when the calibration is finished When the auxiliary interface connector is disabled VARDEF _CONN 0 the voltage on the control lines will go to a TTL low level after an instrument preset IP and will not be affected by the 85719A personality 6 15 Programming _ENR _ENR is a DLP defined trace containing the noise source ENR excess noise ratio table Description
3. CAUTION Specifications Characteristics and Verification System Performance Verification SPECTRUM ANALYZER pa712o Figure 4 1 CAL FREQ and CAL AMPTD Setup 1 Calibrate the spectrum analyzer e Press the front panel key wait for the preset to complete e Press CAL then CAL FREQ amp AMPTD e Wait for the completion of the spectrum analyzer s self calibration routine approximately 5 to 10 minutes e Press CAL STORE to save the calibration data 2 Calibrate the measurement system power meter and power sensor e Connect the power sensor to the sensor input connector on the power meter e Zero and calibrate the HP 437A power meter and the HP 8481D power sensor as described in the HP 437A operation manual Do not calibrate the HP 8481D without the reference attenuator The reference attenuator prevents damage to the HP 8481D low power sensor 4 8 Specifications Characteristics and Verification System Performance Verification Load the Service DLP Delete any previously installed DLPs from user memory 1 Press the following front panel keys to purge user memory then install the service DLP e CONFIG and More 1 of 3 e DISPOSE USER MEM and again DISPOSE USER MEM e RECALL INTERNAL CARD select CARD e Catalog Card CATALOG ALL 2 Select the file labeled dNFSRVC e Press LOAD FILE and wait for the file to load e Press MEAS USER and again MEAS USER The service DLP s
4. Set the frequency conver sion measurement IF stop Srequenc y to 600 MHz The span is 200 MHz and must equal the RF start and stop frequenc y span Set the non conversion mode start frequency to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results in a span equal to the IF frequency span of 200 MHz Calibrate the measurement system Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Make a calibrated noise figure and gain measurement Programming _RFSTOP Query Response The response displays the current RF stop frequency value output Figure 6 45 _RFSTOP Query Response Syntax ORF STO 6 63 Programming _SLOSS Use the SLOSS command to correct for the dB loss values that exist between the input of the device under test and the noise source This loss exists during the calibration procedure and during the measurement SLOSS XSLOSS Default Value Default Units Range 99 90 to 99 90 dB Prerequisite Command _NFMODE Related Commands _INLOSS _OUTLOSS Description Use the SLOSS command to enter or query the dB loss value located at the noise source used in the measurement system as illustrated in Figure 6 47 The loss value is based on cables and other loss factors that are required in the measurement system 6 64 Programming _SLOS
5. 3sigma value change as you adjust the values of the following parameters 2 11 Making Measurements Configuring for Measurements a ESTIMATD DUT NF REPEATABILITY ERROR CALCULATOR Enter parameters tbh find the approximate ESTI MATD NF repeatability due to jitter DUT GAIN TIME BW PROOUCT kHz sec 5100 EST TEST SYS NF gt 0 05 dB 3sigma REPEATABILITY may be reduced by Increasing the Time BW product ESTIMATD out NF 5 00 dB SLdB 0 00 dB mee OUT GAIN 18 00 dB ILdB 0 00 dB TEST SYS NF 1B 00 dB OLdB 0 00 dB ENR 15 00 dB BW 1000 kHz TIME BW 589 kHz se0 Avg Time 0 5 seo Previous Menu L Figure 2 2 The Help Screen Time BW Repeatability Calculator Press ESTIMATD DUT NF and enter the estimated noise figure value of the device you are measuring Press ENTER Low noise figure devices may need more gain for more accurate noise measurements Press ESTIMATD DUT GAIN and enter the estimated gain value of the device you are measuring Press ENTER Higher device gain tends to reduce measurement error Press EST TEST SYS NF displayed at the completion of a calibration and enter the estimated noise figure of the system Press ENTER Press ESTIMATED ENR and enter the approximated noise source ENR value for the frequencies to be measured Press ENTER Press TIME BW PRODUCT and enter a value There is an inverse square root proportionality between repeatability and the time BW factor To reduce the rep
6. POWER SUPPLY pa73a Figure 2 16 Measuring a 75 Frequency Converting Device During the measurement a new menu is presented From the measurement menu you can activate markers enter a title for the measurement change the reference level and scale or change the sweep mode Modifying the states of these menu keys does not require you to complete a new calibration 2 40 Making Measurements Measuring a Frequency Converter Double sideband converter corrections To correct for the effect of double sideband mixing enter an additional 3 dB with the INPUT LOSS correction value The actual resulting value is a sum of the loss correction of the converter input with the 3 dB algebraically added as shown below For input loss 0 additional 3 dB equals 3 dB For input loss 5 additional 3 dB equals 2 dB Refer to product note number 85719A 1for more information about double sideband converter measurement and for the error sources in converter measurements Testing a multiband TV tuner This measurement personality allows you to test a device such as a multiband TV tuner at several RF input frequencies If you keep the IF output frequency fixed you can adjust the RF input frequency and continue measurements w thout having to recalibrate the measurement configuration For frequency conversion measurements the RF frequency values entered in the configuration menu are used only to determine which ENR data to
7. Record the absolute value of the results in Column 6 as the Deviation Between Adjacent Steps Find the value of the largest change in Column 6 of Deviation Between Adjacent Steps and record as the LARGEST DEVIATION below LARGEST DEVIATION dB Press DEVIATN Use the front panel DATA keys and enter the LARGEST DEVIATION value then press ENTER The display readout should be within the following limits NF ERROR gt 0 5_________ lt 0 5 dB 0 08 dB uncertainty GAIN ERROR gt 0 5 ______ lt 0 5 dB 0 08 dB uncertainty 4 13 Specifications Characteristics and Verification System Performance Verification Table 5 1 Noise Level Worksheet RBW 1 MHz Column 1 5 10 dB Atten 1 dB Atten Noise Level Change in ae Meter Deviation in Settings Settings Readout 0 gt Readout Adj Steps AAA o Figure 4 3 Noise level Worksheet RBW 1 MHz Specifications Characteristics and Verification System Performance Verification Measure the Noise Level at 3 kHz RBW Connect the equipment as previously shown in Figure 4 2 Notice that the 20 dB attenuator is connected temporarily between the power splitter and the power sensor The power sensor is later connected directly to the power splitter 1 Adjust the step attenuators for a 25 dBm 1 dB reading on the power meter Record the attenuator settings in Columns 1 and 2 of Figure 4 4 2 Press SETUP Wait for the completion of the setup routine 3 En
8. but not during calibration Menu Key Descriptions Menu Key Descriptions POINTS PREAMP GAIN Previous Menu 3 16 Select this key from the edit ENR data menu to enter the number of frequency points to measure The values from the points measured are used in noise Egure and gain calculations You can measure from 1 to 401 points only certain numbers of points are allowed The personality sets points to the nearest actual number as listed below Number Entered Actual Number Points Measure 1 poin 2 poin 3 poin 5 poin 6 poin 9 poin 11 poi 17 poi 21 poi 26 poi 41 poi 51 poi 81 poi 101 points 201 points 401 points Select this key in the help time BW menu to enter the system preamplifier gain value when other than an HP 87405A preamplifier is used The range for preamplifier gain is 0 0 dB to 99 90 dB The default setting is 22 00 dB Select this key to return to a previously displayed menu RECALL Ref Lvl amp Scale Resume Measure RF START FREQ RFSTOPFREQ RPG Title SELECT AMPLITUD SELECTFREQ SELECT POINT Menu Key Descriptions Menu Key Descriptions Select this front panel key to recall ENR data a display an instrument state or measurement trace from either the memory card or spectrum analyzer memory Select this key in the configuration menu or measurements menu to display the reference level scale menu Changes to the reference level and scale values during mea
9. includes configuration and measurement results displays Storage and edit capability of multiple noise source ENR data tables Measurement marker functions Single point test limit capability Simultaneous display of swept noise figure and gain measurements Variable measurement bandwidth control Calculator for measurement repeatability Mixer test compatibility such as for frequency converters and receivers Loss compensation data entry to correct for cables and other losses In This Guide Read the following information to get an idea of what the different chapters of this guide contain e Chapter 1 Getting Started guides you through setting up the measurement personality DLP for use Instructions for using the self test to verify hardware operation are provided Also the differences between spectrum analyzer front panel key operations and the noise figure measurements personality key operations are explained in this chapter e Chapter 2 Making Measurements guides you through measurement examples The recommended test equipment table methods for optimizing measurements results and measurement configuration information is located in this chapter The default configuration settings are listed here as well e Chapter 3 Menu Key Descriptions provides the menu map of the DLP and a description of each menu key in alphabetical order e Chapter 4 Specifications Characteristics and System Verificati
10. 3 17 noise figure scale 3 15 noise figure test system 3 11 noise source model number 1 2 noise source serial number 3 18 noise source temperature data 3 18 non conversion start and stop frequencies 3 18 normal marker function 3 14 O operating messages 5 3 output loss data entry 3 15 P personality menu map 3 3 points deleting ENR data points 3 10 preamplifier gain data 3 16 preamplifier model number 1 2 purging the personality 3 10 R recalling display states 3 6 recalling ENR data 3 7 recalling ENR data from internal memory 3 13 recalling states 3 7 recalling states from internal memory 3 13 recommended noise source 1 2 recommended preamplifier 1 2 repeatability calculator DUT gain 2 11 3 11 repeatability calculator DUT noise figure 2 11 3 11 repeatability calculator ENR 2 11 3 11 repeatability calculator measurement points 2 11 3 16 repeatability calculator test system noise figure 2 1 1 3 11 RF start and stop frequency 3 17 RPG title mode 3 17 S safety ix safety symbols viii saving display states on the card 3 10 saving ENR data to internal memory 3 11 saving ENR data to memory cards 3 10 saving instrument states to internal memory 3 19 saving instrument states to memory card 3 19 self test 3 18 setting configuration defaults 3 8 setting reference level and scale 3 17 software product license agreement iii 7 Index 4 source loss 3 18 states in instrument memor
11. ANALYZER NOISE SOURCE SYSTEM pa77a LOSS Figure 2 4 System loss location During Device Measurement Making Measurements Configuring for Measurements e Press SOURCE LOSS and enter the known loss value present at the location indicated in Figure 2 6 or Figure 2 5 The loss is subtracted from the excess noise ratio ENR SPECTRUM ANALYZER NOISE SOURCE SOURCE pa7t4a LOSS Figure 2 5 SOURCE LOSS location During Calibration 2 16 Making Measurements Configuring for Measurements SPECTRUM ANALYZER 28 VOLTS SWITCHED NOISE SOURCE SOURCE pa7Ba LOSS Figure 2 6 SOURCE LOSS Location During Device Measurement 2 17 Making Measurements Configuring for Measurements 2 18 e Press INPUT LOSS and enter the known loss value present at the location indicated in Figure 2 7 or Figure 2 8 as the input loss The input loss of the DUT is added to its noise figure but subtracted from the its gain SPECTRUM ANALYZER 28 VOLTS SW TCHED PREAMPLIFIER NOISE SOURCE pa 715a Figure 2 7 INPUT LOSS location During Calibration Making Measurements Configuring for Measurements SPECTRUM 28 ANALYZER SWI INPUT pa79a LOSS Figure 2 8 INPUT LOSS location During Device Measurement 2 19 Making Measurements Configuring for Measurements Press OUTPUT LOSS and enter the known loss value present at the
12. An ENR table can be entered from an existing table stored in the internal memory or from a table stored on a memory card A new ENR table can also be entered NOTE If an ENR data table is not entered remotely either the default table or the table that was last edited saved or recalled will be used The following procedures should be used to load the the ENR table whenever it is desired to change the ENR data used by the Noise Figure Measurements Personality To Recall an To recall an existing ENR table stored in the internal memory complete the Existing ENR following command line Table Figure 6 8 _ENR Syntax Recalling Existing Table from Internal Memory xenrd Register number range 0 to 52 Programming ENR Example 10 OUTPUT 718 TP Presets spectrum analyzer Program 20 OUTPUT 718 RCLT _ENR 1 Loads ENR table from in ternal memory 30 OUTPUT 718 _NFMODE Enters NF mode To recall an existing ENR table stored on a memory card complete the following command line Figure 6 9 _ENR Syntax Recalling Existing Table from Memory Card Register number range 0 to 99 Delimiter Matching characters of the following amp Example Program 10 OUTPUT 718 IP Presets spectrum analyzer 20 OUTPUT 718 LOAD tNFENR_5 _ENR Loads ENR tablefrom mem ory card register 5 30 OUTPUT 718 _NFMODE Enters NF mode 6 17 Programming ENR To Create a To enter a new ENR table co
13. Egure and gain remote commands provided in Chapter 6 of this manual 1 2 Users Guide Key Conventions The following key conventions are used throughout this guide FRONT PANEL KEY Softkey and SOFTKEY Screen Text NOTE Boxed text indicates a key physically located on the front panel of the spectrum analyzer or a controller keyboard Shaded text indicates a key label that appears on the display of the spectrum analyzer The keys that are associated with the labels are physically located on the right hand side of the spectrum analyzer display These are frequently referred to in text as the measurement personality s menu keys Bold text in this typeface indicates information that you may see displayed on the spectrum analyzer screen This is often representative of prompts warnings and results information When pressing hardkeys or softkeys be sure to allow sufficient time for the spectrum analyzer to respond to the command Fast consecutive key presses may cause an error in the spectrum analyzer 1 3 Installing the Measurement Personality To install the noise figure and gain measurement personality all of the spectrum analyzer user memory needs to be available Dispose previously installed DLPs then install the HP 85719A DLP You can confirm that the measurement personality and associated hardware are working properly with the self test function available in the personality s main menu To d
14. LABEL command especially after transitioning between frequency conversion and non conversion measurements to update the display annotation with accurate settings 20 OUTPUT 718 _NFMODE 25 OUTPUT 718 DEFAULTS 30 OUTPUT 718 _FCONV 1 35 OUTPUT 718 _LABEL 40 OUTPUT 718 _IFSTART 400MHZ 50 OUTPUT 718 _IFSTOP 600MHZ 60 OUTPUT 718 _RFSTART 650MHZ 70 OUTPUT 718 _RFSTOP 850MHZ 80 END Turn on noise figure mode Set measurement configu ration parameters to default Turn the frequency con version mode ON Redraw display annota tion for frequency conver sion mode measurement state Set the frequency conver sion measurement IF start frequency to 400 MHz Set the frequency conver sion measurement IF stop frequency to 600 MHz The span is 200 MHz and must equal the RF start and stop frequency span Set the non conversion mode start frequency to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results in a span equal to the IF frequency span of 200 MHz Programming _MEASURE Use the MEASURE command to initiate the noise figure and gain measurement sequence Gar xmeas Figure 6 29 MEASURE Syntax Prerequisite Command _NFMODE Description Use the MEASURE command to initiate a measurement Before measurements can begin the measurement configuration and system calibration if an accurate noise figure measurement or a gain trace is desired must
15. License Agreement you may return the unopened package for a full refund 111 License Agreement In return for payment of the applicable fee Hewlett Packard grants the Customer a license in the software until terminated subject to the following Use e Customer may use the software on one spectrum analyzer instrument e Customer may not reverse assemble or decompile the software Copies and Adaptations e Customer may make copies or adaptations of the software a For archival purposes or a When copying or adaptation is an essential step in the use of the software with a computer so long as the copies and adaptations are used in no other manner e Customer has no other rights to copy unless they acquire an appropriate license to reproduce which is available from Hewlett Packard for some software e Customer agrees that no warranty free installation or free training is provided by Hewlett Packard for any copies or adaptations made by Customer e All copies and adaptations of the software must bear the copyright notices s contained in or on the original Ownership e Customer agrees that they do not have any title or ownership of the software other than ownership of the physical media e Customer acknowledges and agrees that the software is copyrighted and protected under the copyright laws e Customer acknowledges and agrees that the software may have been developed by a third party software supplier named in t
16. Making Measurements Configuring for Measurements NOTE Memory card memory registers O to 999 are available Be aware that ENR data is stored to trace registers TRO to TR52 and registers ST1 through ST8 are reserved for spectrum analyzer operations only Trace registers TRO to TR52 can be used to store both ENR data and states When using interal memory a different register must be used for each ENR data and state saved Avoid using spectrum analyzer state register 8 ST8 The measurement WARNING personality uses ST8 for temporary storage of state and trace data To recall ENR data tables ENR data tables may be stored in spectrum analyzer memory or in a memory card memory register To recall existing ENR data tables refer to the steps below NOTE ENR data tables are prefixed TR in spectrum analyzer memory or tNFENR in memory card memory Refer to Table 2 4 for an explanation of the prefixes in the memory locations Press the front panel key while you are in NF amp gain mode 2 Press INTRNL CARD until the memory location you want is underlined e When INTRNL is underlined press INTRNL gt ENR to display the ENR data tables in spectrum analyzer memory e When CARD is underlined press CARD ENR to display the ENR data tables in memory card memory 3 Use the RPG or step keys to highlight the ENR data table of interest Making Measurements Configuring for Measurements 4 Press LOAD F
17. Syntax o e 6 20 Contents 4 6 12 6 13 6 14 6 15 6 16 6 17 6 18 6 19 6 20 6 2 1 6 22 6 23 6 24 6 25 6 26 6 27 6 28 6 29 6 30 6 31 6 32 6 33 6 34 6 35 6 36 6 37 6 38 6 39 6 40 6 41 6 42 6 43 6 44 6 45 6 46 6 47 6 48 6 49 6 50 6 51 6 52 Contents FCONV Query Response Syntax 6 22 ESTART Syntax cae a cee a ere Rok ue AA 6 23 _FSTART Query Response Syntax 6 24 ESTOP SYntaX 4 se dong see Gene a ave Aer ge e 6 25 FSTOP Query Response Syntax 2 6 26 SGIVG Synta k eni oe Ser Pe we a ee ee 6 27 GLVL Query Response Syntax 0 040 6 28 OSCAR Syntax E lal Ge Ry Neil a er dae ah 6 29 GSCALE Query Response Syntax 6 30 CIESTA RTS MAR Se 2 Bs eo oe oe Roe ke we 6 31 IFSTART Query Response Syntax 6 32 O ss a oie Sg a ob BRA ee teeth ee Si grt ey 6 33 _IFSTOP Query Response Syntax 6 34 INTIS ONS VIAN Sa Gv een RG cy ER Reta Gy G 6 35 Location of Input Loss Characteristic 6 36 INLOSS Query Response Syntax 0 6 38 LABEL Syntax io ha ca er ORE SO o kT 6 39 MEASURE Syntax 2 200 008 6 40 PEA A A e Ad 6 43 NFIVL Query Response Syntax 6 44 NFMODE Syntax rias ed Aa Cae oda ee BE ie ae 6 45 NFSCALE Syntax e xe Se ok ee A e 6 47 NFSCALE Query Response Syntax 2 6 48 OUTLOSS
18. Syntax acs Geto gs ie ek Ge Aes a ee es 6 49 Location of Output Loss Characteristic 2 2 6 50 OUTLOSS Query Response Syntax 6 52 DP GAIN SS Vitae at e fh hee eh car ate dh ee te She sae ge 6 53 PGAIN Query Response Syntax 0 6 54 SPT S SUR she abaya e a deo le das iia SE OR 6 55 PTS Query Response Syntax o o a 6 57 RESTART Syntaks E Se 6 58 _RFSTART Query Response Syntax 6 60 RESTOP Syntax cas BG ake Poe tte Sak yds as 6 61 _RFSTOP Query Response Syntax 6 63 SLOSS Syntax g 35 04 a 6 64 Location of Noise Source Loss Characteristic 6 65 SLOSS Query Response Syntax 6 67 _TBW Synt x ba UR o e ee 6 68 TBW Query Response Syntax 020 6 69 TBWAUTO Syntax 2 2 en 6 70 TBWAUTO Query Response Syntax 2 6 71 Contents 5 Contents 6 53 _TEMPC Syntax 6 54 _TEMPC Query Response Syntax Contents 6 Tables l 1 Hewlett Packard Sales and Service Offices 1 9 2 1 Equipment Requirements 2 3 2 2 Configuration Selections 24 2 6 2 3 Points Entered vs Points Measured 2 10 2 4 Prefix Descriptions of Memory Registers 2 29 3 1 Noise Figure and Gain Default Parameters 3 9 4 1 Specifications 2 2 ee 4 4 5 1 Measurement Personality Information Messages 5 3 6 1 Functional Index 2 2 ee ee 6 4 6 2
19. Use the _RFSTOP command to enter the RF stop frequency for a frequency conversion noise figure and gain measurement s stop frequency RESTOP xrfsto Figure 6 44 _RFSTOP Syntax Description Default Value 4 20 GHz Default Units HZ Range 0 0 Hz t0999 GHz Prerequisite Command NFMODE Related Commands FCONV _IFSTART _IFSTOP _RFSTART Description Use the RFSTOP command to set or query the RF stop frequency value The RF start and stop frequency span must match the IF stop and start frequency span Frequency conversion needs to be selected for these values to be active 6 61 Example Program Programming _RFSTOP 20 25 30 35 40 50 60 70 80 90 OUTPUT 718 _NFMODE OUTPUT 718 _DEFAULTS OUTPUT 718 _FCONV 1 OUTPUT 718 _LABEL OUTPUT 718 _IFSTART 400MHZ OUTPUT 718 _IFSTOP 600MHZ OUTPUT 718 _RFSTART 650MHZ OUTPUT 718 _RFSTOP 850MHZ OUTPUT 718 _CAL OUTPUT 718 DONE 100 ENTER 718 DONE 110 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 115 PAUSE 120 OUTPUT 718 _MEASURE 130 END 6 62 Turn on noise figure mea surements personality mode Set all measurement con figuration parameters to default values Turn the frequency con version mode ON Redraw display annota tion for frequency conver sion mode measurement state Set the frequency conver sion measurement IF start frequency to 400 MHz
20. a noise signal as the source The specifications are derived from the known performance of the spectrum analyzer hardware The HP 85719A measurements personality is not installed during the service DLP verification procedure The service DLP file available on the HP 85719A noise figure measurements personality card must be installed before the following verification procedure can be performed Service Test Function Keys Descriptions There are five softkeys associated with the service DLP After completing the service DLP and installing the HP 85719A measurements personality an additional service related key labeled SELF TEST is available The SELF TEST key is in the main menu of the HP 85719A noise figure measurements personality The five service DLP keys and the SELF TEST key descriptions follow 28V ON OFF Press this key to turn the spectrum analyzer s rear panel 28 Vdc supply on or off When ON is underlined the 28 Vdc is activated to supply current to the noise source SETUP Press this key and the program presets the spectrum analyzer then sets the parameters required for performing the verification test You enter the resolution bandwidth the program applies noise corrections to the normal log fidelity corrections and the 28 Vdc is activated Pressing PRESET disables the noise corrections SYSNOISE Press this key during the verification procedure to record the spectrum analyzer noise floor before 4 5 Speci
21. be used to obtain measurement output however in some instances the plot may not yield exactly what appears on screen 2 33 Measuring an Amplifier To measure an amplifier connect the equipment but bypass the device to be tested as stated in Calibrating for Measurements and illustrated in Figure 2 12 Be sure to include all needed adapters cables and hardware required for your test Configuring for the measurement Refer to the steps below to enter measurement parameters for the amplifier The specific values are not included Use the values unique to the device you are testing l Press Conf ig in the main menu 2 Press Freq Menu then underline NO in the Conversion YES NO key 3 Enter the start and stop frequencies of the device you are testing 4 Press Previous Menu and select POINTS e Enter a number with the front panel data keys remembering that the number you enter may be translated into a number that can be used Refer to the POINTS key description in Chapter 3 Menu Key Descriptions e Terminate the value with the ENTER key e If you entered POINTS 1 you can also enter test limit values e Return to the configuration menu by pressing Previous Menu Press More 1 of 2 to enter additional measurement parameters as explained in above in To enter time BW parameters 2 34 Making Measurements Measuring an Amplifier Calibrate the measurement If you calibrate the measurement se
22. e Contact one of the HP sales and service offices listed in the Table 1 1 Describe the trouble to the service office personnel e If returning the instrument to the manufacturing factory is required shipping instructions are located in Chapter 5 If You Have a Problem in this guide The HP Sales and Service Office personnel can answer questions for you Have a copy of the error messages available when you talk to one of the engineers Getting Started Using the Self Test Feature Table l l Hewlett Packard Sales and Service Offices US FIELD OPERATIONS Headquarters California Northern California Southern Colorado Hewlett Packard Company Hewlett Packard Co Hewlett Packard Co Hewlett Packard Co 19320 Pruneridge Avenue 301 E Evelyn 1421 South Manhattan Ave 24 Inverness Place East Cupertino CA 95014 USA Mountain View CA 94041 Fullerton CA 92631 Englewood CO 80112 1800 752 0900 14151 694 2000 17141 999 5700 13031 649 5000 Georgia Illinois New Jersey Texas Hewlett Packard Co Hewlett Packard Co Hewlett Packard Co Hewlett Packard Co 2000 South Park Place 5201 Tollview Drive 120 W Century Road 930 E Campbell Rd Atlanta GA 30339 Rolling Meadows IL 60008 Paramus NJ 07653 Richardson TX 75081 14041 955 1500 17081 255 9800 12011 599 5000 12141 231 6101 Headquarters France Germany Great Britain Hewlett Packard SA Hewlett Packard France Hewlett Packard GmbH Hewlett Packard Ltd 150 Route du Nant d Avril 1 Avenue Du C
23. frequency converting devices The second mode is for non frequency converting devices When the DUT device under test is a frequency converter the RF and IF frequency values need to be entered The RF frequency values are used in the personality to select the appropriate ENR data The IF frequencies are those of the DUT output To set the measurement frequency range for frequency converters refer to the following steps 1 Press Conf ig in the main menu 2 Press Freq Menu in the configuration menu 3 Press Conversion YES NO to underline YES when you are measuring a frequency conversion device 4 Enter the IF and RF start and stop frequencies of the DUT NOTE Be sure to enter an RF frequency span equal to the IF frequency span The RF start frequency must correspond with the IF start frequency even if it results in a backwards sweep condition e Press RF START FREQ and RF STOP FREQ to enter the RF frequency values of the DUT e Press IF START FREQ and IF STOP FREQ to enter the IF frequency values of the DUT 2 8 Making Measurements Configuring for Measurements To enter the number of measurements points Enter the number of measurement points you want to use The larger the number of points the longer the measurement As few as 1 point or as many as 401 points can be measured as listed in Table 2 3 below You can modify the speed of measurements via the time BW menu keys To enter the number of poi
24. location indicated in Figure 2 9 or Figure 2 10 as the output loss The output loss is subtracted from the gain or the device under test but proportionally calculated into its noise figure SPECTRUM ANALYZER 28 VOLTS SWITCHED NOISE SOURCE pa716a Figure 2 9 OUTPUT LOSS location During Calibration 2 20 Making Measurements Configuring for Measurements SPECTRUM ANALYZER OUTPUT pa710a LOSS Figure 2 10 OUTPUT LOSS location During Device Measurement 2 21 Making Measurements Configuring for Measurements To enter preamplifier gain The gain of the measurement system preamplifier should be entered via the PREAMP GAIN key The gain value is used during system calibration and measurement calculations Refer to the following steps 1 Press the Conf kg key in the main menu 2 Press More 1 of 2 in the configuration menu 3 Press PREAMP GAIN and enter the known minimum preamplifier gain e Use the fp and Q keys to change the gain value in 1 0 dB increments e Use the RPG to change the gain value in 0 01 dB increments e Use the front panel data keys to enter exact values Terminate data key entry with the ENTER key 4 Complete data entry by pressing a dB units key Making Measurements Configuring for Measurements To enter noise source case temperature The noise source case temperature or ambient temperature contributes to measurement accuracy results If the
25. noise source ENR of 14 dB to 16 dB is used with the measurement setup If other hardware is used the specifications are not valid 4 3 Specifications Characteristics and Verification Specifications and Characteristics Table 4 1 Specifications Specification Performance limits Comditims Noise Figure Measurement Range D to 25 dB Resolution 0 01 dB Instrumentation Uncertainty For noise figure lt 15 dB 0 55 dB Measurement Bandwidth 3 kHz 0 5 dB Measurement Bandwidth 1 MHz Instrumentation Uncertainty typical 0 3 dB For noise figure lt 20 dB Measurement Bandwidth 3 kHz to 1 MHz Gain Measurement Range 0 to 40dB Resolution 0 01 dB Instrumentation Uncertainty For noise figure lt 15 dB 0 65 dB Measurement Bandwidth 3 kHz 0 5 dB Measurement Bandwidth 1 MHz Instrumentation Uncertainty typical 0 3 dB Measurement Bandwidth 3 kHzto 1 MHz Input Frequency Range 10 MHz to2 9 GHz When used with HP 8594E Spectrum Analyzer System Noise Figure lt 12 dB Input SWR lt 2 1 Maximum Svstam Input Power 45 dBm At HP 87405A Preamplifier input Measurement Measurement Bandwidth 1 0 kHzto 3 MHz 3 dB Resolution Bandwidths For NF gain lt 35 dB Spectrum analyzer residual responses lt 10x Log measurement bandwidth in Hz 160 dBm 4 4 System Performance Verification The procedure in this section verifies the log scale fidelity of the spectrum analyzer using
26. noise source is used to measure devices within a temperature chamber the temperature of the chamber needs to be entered into the configuration settings Refer to the following steps l Press Canf ig in the main menu 2 Press More 1 of 2 in the configuration menu 3 Press SOURCE TEMP and enter the ambient temperature of the testing environment Retain the default setting of 21 C for measurements made in typical room temperature environments e Use the and J keys to change the temperature value in 1 0 C increments Do not press ENTER The value is automatically accepted e Either do not use the RPG or use it very carefully The RPG will change the temperature value very fast Small rotations cause large changes Do not press ENTER the value is automatically accepted e Use the front panel data keys to enter exact values then press ENTER 2 23 Making Measurements Configuring for Measurements To edit noise source ENR data The noise source s ENR excess noise ratio data is used by the personality to calculate measurement results The data listed on the noise source is typically unique to each noise source ENR data tables can be saved to or recalled from memory cards and spectrum analyzer memory registers OTE The measurement personality arrives with a default ENR data table installed in memory Either the default table or the table that was last edited saved or recalled is the table that is used The ENR data
27. s main menu ABORT CAL AVG TIME AUTO MAN BANDWDTH CAL Select this key in the CAL menu to interrupt the measurement setup calibration Select this key in the time BW menu to set the averaging time You can use the average time value to reduce the effects of jitter on measurement repeatability The longer the average time the better the jitter reduction The range of values is from 100 ms to 999 s the default setting is AUTO and 100 ms The and Q keys increment time in 0 1 second when the value is less than 1 0 second The step increments above 1 0 second are 1 O second When AVG TIME AUTO is selected the average time value is coupled with the measurement bandwidth value As a result a time bandwidth product is calculated When AVG TIME MAN is selected you can change the length of measurement time for each point without changing the time BW product Select this key to display or change the measurement resolution bandwidth Select this key in the main menu to calibrate the noise figure and gain measurement setup To measure device gain system calibration must be completed You can measure the noise figure of a device without calibrating the system however additional errors occur in the measurement results The setup must include the preamplifier noise source adapters and any other hardware 3 5 Menu Key Descriptions Menu Key Descriptions NOTE that remains in the test setup during device measur
28. should be within the following limits NF ERROR gt 0 55 lt 0 55 dB 0 08 dB uncertainty GAIN ERROR gt 0 65_________ lt 0 65 dB 0 08 dB uncertainty At the completion of the verification procedure remove the DLP from user memory 1 Press PRESET to purge the noise correction values from memory 2 Press CONFIG then More 1 of 3 3 Press DISPOSE USER MEM and again DISPOSE USER MEM to remove the service DLP from user memory 4 17 Specifications Characteristics and Verification System Performance Verification Table 5 2 Noise Level Worksheet RBW 3 MHz Column 5 Column 6 10 dB Atten Change in Power Meter Deviation in Settings Noise Level Read Adj Steps i et Figure 4 4 Noise level Worksheet RBW 3 kHz If Verification Fails If the verification test does not pass refer to the following tips e Be sure that the spectrum analyzer self calibration routines were completed just prior to running the verification test e Leave the amplifiers on overnight and just before beginning service testing if possible A small change in temperature can cause a large change in noise amplitude e Be sure the spectrum analyzer has been powered on for 2 hours at a stable ambient temperature before beginning service testing e Try to complete the verification test in one sitting e Make precise measurements the Erst time since the test is tedious and difficult e Use cables that have threaded connectors BN
29. use The ENR of quality noise sources is very constant over frequency therefore the exact RF value need not be entered in most cases 2 41 Making Measurements Measuring a Frequency Converter NOISE SOURCE 2493 40 TV TUNER Gain 5 58 dB Marker 182 550 MHz NF 41 00 dB die NF RL 0 0 dB START RF 180 000 MHz RF IF 68 808 MHz LF Bandwidth 1 808 MHz 21 Pts fivg Time Gain RL 6 dB MARKER DELTA Main Menu Resume Neasure STOP 186 000 MHz 66 800 MHz 8 5 sec pt RL Figure 2 17 TV Tuner Measurement Results Example 2 42 Menu Key Descriptions Menu Key Descriptions This chapter is a reference that contains the measurement personality menu map and the menu key descriptions Refer to Chapter 2 Making Measurements for specific measurement procedures that use these keys The main menu of the personality is illustrated in Figure 3 1 below Noise figure NOISE SOURCE B m j 47 The measurement personality main menu trace scale divy d t UC aa AA o Cone MEASURE Source Loss Bain A E A ae ALE E E ROEPEN E EESE T MUA E P A a pages Config wpe ees Lag O NEEESE NRE E EEE EE RL a ah ec eds E Entry iLi E San ER IS perne nan DEFAULT 0 8 i gt A E CONFIG A A A A A eee EO output Loss 3 8 Entry Deg ce get TES SELF A ig OS AE SS i TEST Noise Source START Pain RL 11859 g8 STOP DISPOSE 40 808 MHz 1800 000 MHz NF amp GAIN case i temperature 7 1 000 MHz pt Pt
30. 0 70 OUTPUT 718 _NFMODE OUTPUT 718 _DEFAULTS OUTPUT 718 _FCONV 1 OUTPUT 718 _LABEL OUTPUT 718 _IFSTART 400MHZ OUTPUT 718 _IFSTOP 600MHZ OUTPUT 718 _RFSTART 650MHZ OUTPUT 718 _RFSTOP 850MHZ 80 END Turn on noise figure mea surementspersonality mode Set all measurement con figuration parameters to default values Turn the frequency con version mode ON Redraw display annota tion for frequency conver sion mode measurement state Set the frequency conver sion measurement IF start frequency to 400 MHz Set the frequency conver sion measurement IF stop frequenc y to 600 MHz The span is 200 MHz and must equal the RF start and stop frequency span Set the non conversion mode start frequenc y to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results in a span equal to the IF frequency span of 200 MHz Query Response The response displays the current IF stop frequency value output Figure 6 24 _IFSTOP Query Response Syntax 6 34 QIFSTO Programming _INLOSS _INLOSS Use the _INLOSS command to correct for the dB loss values that exist at the input of the device under test NOTE If the loss is present when the calibration is made do not enter a loss value with this command These losses are introduced into the measurement setup after calibration is completed INLOSS AA C Figure 6 25 _INLOSS Syntax XINLOS Descr
31. 0 to 999 0 C Prerequisite Command _NFMODE Related Commands rone Description Use the TEMPC command to enter or query the case temperature of the noise source being used for measurements The case temperature is determined by the temperature of the environment where the measurements are being made Example 20 OUTPUT 718 _NFMODE Turn on noise figure mea Program surements personality mode 25 OUTPUT 718 DEFAULTS Set all measurement con figuration parameters to default values 40 OUTPUT 718 _FCONV 1 Turn the frequency con version mode ON 45 OUTPUT 718 LABEL Redraw display annota tion for frequency conver sion mode measurement state 6 72 50 OUTPUT 718 _IFSTART 400MHZ 60 OUTPUT 718 _IFSTOP 600MHZ 70 OUTPUT 718 _RFSTART 650MHZ 80 OUTPUT 718 _RFSTOP 850MHZ 90 OUTPUT 718 _TEMPC 19 100 OUTPUT 718 _CAL 110 OUTPUT 718 DONE 120 ENTER 718 DONE 130 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 140 OUTPUT 718 _MEASURE 150 END Programming _TEMPC Set the frequency conver sion measurement IF start frequency to 400 MHz Set the frequency conver sion measurement IF stop frequency to 600 MHz The span is 200 MHz and must equal the RF start and stop frequency span Set the non conversion mode start frequency to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results in a span equal to the IF frequency
32. 0 OUTPUT 718 _CAL Calibrate the measurement setup 60 OUTPUT 718 DONE Query the spectrum ana lyzer for the calibration routine status 70 ENTER 718 DONE Get the status condition 6 53 Programming PGAIN 80 DISP CALIBRATION DONE PRESS Display the calibration CONTINUE WHEN READY TO MEASURE done message 85 PAUSE Wait for the key to be pressed 90 OUTPUT 718 _MEASURE Make a calibrated noise figure and gain measurement 100 END Query Response The response displays the current preamplifier gain value output terminator QGAINL Figure 6 39 _PGAIN Query Response Syntax 6 54 Programming PTS _PTS Use the PTS command to select the number of measurement points xpts Figure 6 40 PTS Syntax Description Default Value 11 Default Units none Range 1 to 401 Prerequisite Command _NFMODE Related Commands MEASURE Description Use the _PTS command to set or query the measurement point The number of measurement points determines number of equally spaced frequency points evaluated for noise figure and gain 6 55 Programming PTS Number Entered Actual Number Points Measured 66 to 91 to 150 151 to 300 301 to 401 Example 20 OUTPUT 718 _NFMODE Program 30 OUTPUT 718 _DEFAULTS 40 OUTPUT 718 _PTS 3 50 OUTPUT 718 _CAL 60 OUTPUT 718 DONE 70 ENTER718 DONE 80 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 85 PAUSE
33. 1 points 301 to 401 401 points 2 10 Determine the time bandwidth product Making Measurements Configuring for Measurements To enter time BW parameters Enter time bandwidth measurement parameters via the Time BW Menu key following the steps below l Press Conf ig in the main menu 2 Press More 1 of 2 then Time BW Menu 3 Press BANDWDTH and use the front panel data keys enter a measurement bandwidth e Use 1 MHz measurement bandwidth except when measuring narrow band devices e For narrow band devices use a bandwidth narrower than the device bandwidth 4 Terminate data entry by pressing a frequency units key To set the time bandwidth product in kHz seconds multiply the desired averaging time in seconds by the measurement bandwidth in kHz Increasing the time bandwidth value can reduce the measurement s repeatability error Use the Help Time BW key to understand more about controlling measurement error Refer also to the product note 85719A 1 The following steps guide you through data entry 1 Press TIME BW PRODUCT key e Enter a larger value to reduce repeatability error jitter but increase measurement time e Enter a smaller value to reduce measurement time at the cost of increased measurement repeatability error jitter 2 Press Help Time BW to review the values in the measurement repeatability calculator Refer to Figure 2 2 for an example of the repeatability calculator Notice the
34. 8 _IFSTART 400MHZ 50 OUTPUT 718 _IFSTOP 600MHZ 60 OUTPUT 718 _RFSTART 650MHZ 70 OUTPUT 718 _RFSTOP 850MHZ 80 OUTPUT 718 _CAL 90 OUTPUT 718 DONE 100 ENTER 718 DONE 110 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 115 PAUSE 120 OUTPUT 718 _MEASURE 130 END Programming RFSTART Turn on noise figure mea surements personality mode Set all measurement con figuration parameters to default values Select frequency conver sion mode Redraw display annota tion for frequency conver sion mode measurement state Set the frequency conver sion measurement IF start frequency to 400 MHz Set the frequency conver sion measurement IF stop frequency to 600 MHz The span is 200 MHz and must equal the RF start and stop frequency span Set the non conversion mode start frequency to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results in a span equal to the IF frequency span of 200 MHz Calibrate the measurement system Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Make a calibrated noise figure and gain measurement Programming RFSTART Query Response The response displays the current RF start frequency value output Figure 6 43 _RFSTART Query Response Syntax ORF STA 6 60 Programming _RFSTOP _RFSTOP
35. 9 90 dB Prerequisite Command _NFMODE Related Commands _NFSCALE GLVL _GSCALE Description Use the NFLVL command to set or query the noise figure measurement reference level Changing the reference level does not affect system calibration therefore it can be adjusted during the measurement Example Program 20 OUTPUT 718 _NFMODE Turn on noise figure mea surements personality mode 25 OUTPUT 718 DEFAULTS Set all measurement con figuration parameters to default values 30 OUTPUT 718 _PTS 3 Set the number of mea surement points to 3 40 OUTPUT 7 18 _FSTART 300MHZ Set the non conversion mode start frequency to 300 MHz 50 OUTPUT 718 _FSTOP 1200MHZ Set the non conversion mode stop frequency to 1200 MHz 6 43 Programming NFLVL 60 OUTPUT 718 _CAL 70 OUTPUT 718 DONE 80 ENTER 718 DONE 90 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 95 PAUSE 100 OUTPUT 718 _MEASURE 110 OUTPUT 718 _NFLVL 5DB _NFSCALE 1DB 120 END Calibrate the measurement system Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Start the calibrated noise figure and gain measurement Set the noise figure trace reference level to 5 dB Set the noise figure scale for 1 dB Query Response The response displays the current noise figure reference level value output
36. ART FREQ In frequency conversion mode enter or query the measurement IF star frequency _IFSTOP IF STOP FREQ In frequency conversion mode enter or query the measurement IF stor frequency _INLOSS INPUT LOSS Enter or query the value of loss that is affixed to the input of the device under test LABEL none Redraw refresh the display annotation especially following transitions between frequency conversion and non frequency conversion modes MEASURE Measure Initiate the noise figure and gain measurement NFL NF REF LEVEL Enter or query the reference level for the noise figure trace NFMODE NF amp GAIN Activates noise figure mode Initially required before sending or queryin noise figure and gain measurement commands _NFSCALE NF SCALE Enter or query the measurement scale for the noise figure trace in d B div OUTLOSS OUTPUT LOSS Enter or query the value of loss affixed to the output of the device under test PTS POINTS Enter or query the number of frequency points measured If the numb of points is set to 1 measurement limits can be entered RFSTART RF START FREQ In frequency conversion mode enter or query the measurement RF stai frequency _RFSTOP RF STOP FREQ In frequency conversion mode enter or query the measurement RF sto frequency SLOSS SOURCE LOSS Enter or query the value of loss value affixed to the output of the noi Source used in the measurement _TBW TIME BW PRODUCT Enter or
37. C cables and connectors lack noise immunity and can introduce random noise unrelated to the device under test 4 19 If You Have a Problem If You Have a Problem This chapter contains a table of several messages that you may encounter as you use the measurement personality Depending on your measurement complexity additional messages may occur that are not listed here If necessary contact any sales and service representative listed in Chapter 1 Table 1 1 HP Sales and Service Offices Information about packaging and general problem with suggested solutions are also included 5 2 Measurement Personality Messages The messages in Table 5 1 provide information to you and typically appear during measurement personality operation Table 5 1 Measurement Personality Information Messages Message Displayed Description alpha order Calibrating The calibration routine is beginning The massage identifies the beginning Calibration done This massage appears when system calibration is finished Connect the device Ready to measure to be tasted and begin making measurements DUT Calibration not This massage warns you that if certain measurement parameters are modified valid System NF the correction data no longer applies You can continua measuring noise figure correction will not however no gain measurement is made be applied Computing new LOG Following a new spectrum analyzer calibration the measurement personal
38. Commands in Alphabetical Order 6 6 Contents 7 Getting Started Getting Started The noise figure and gain measurements require an HP 859XE Series spectrum analyzer The information about measurements in this guide assume you are using an HP 87405A probe powered preamplifier and an HP 346B noise source The sections in this chapter provide the following e Instructions for installing the HP 85719A Noise Figure Measurements Personality into an Option 119 HP 859XE Series spectrum analyzer e Instructions for verifying hardware operation using the SELF TEST menu ke After the measurement personality is copied into spectrum analyzer memory some spectrum analyzer functions change The notable differences with the measurement personality installed are listed below lt e The following front panel keys are disabled FREQUENCY SPAN AMPLITUDE AUX CTRL MEAS USER All MARKER and CONTROL keys The front panel CAL key function calibrates the instrument for making noise figure and gain measurements rather than spectrum analysis measurements e The front panel RPG title mode bandwidth and marker key functions are disabled and relocated as menu keys in the measurement personality s menu The front panel SAVE and RECALL keys display measurement personality specific menu operations Several spectrum analyzer remote commands are invalid while you are in noise Egure and gain measurement mode Use the noise
39. Hz whichever is less Default Setting 0 5 sec pt and Auto mode 1 0 MHz 1 45 GHz 950 0 MHz 3 70 GHz 4 20 GHz 15 0 dB lall frequency points 10 0 dB 5 0 dB 10 0 dB 15 0 dB 99 90 dB 99 90 dB 0 0 dB 10 0 dB 0 0 dB 0 0 dB 99 90 dB 2 0 dB div 0 00 dB 0 0 00 dB 11 22 0 dB 10 0 MHz 1 8 GHz 21 0 C 0 00 dB 500 kHz sec Menu Key Descriptions Menu Key Descriptions DELETE POINT DISPLAY gt CARD DISPOSE NF amp GAIN Edit Done Edit ENR Data ENR CARD Select this key in the edit ENR data menu to delete the highlighted ENR data from the table displayed The segment highlighted is deleted and the list of points is automatically renumbered Select this key from the front panel SAVE key menu when CARD is underlined in INTRNL CARD Pressing the DISPLAY CARD key saves the display to the memory card Select this key in the main menu to erase the noise figure and gain DLP from spectrum analyzer memory Select this key in the edit ENR data menu when you have finished editing ENR data and have saved the edited data in a table The Edit Done key returns you to the previous noise figure and gain measurement menu The edited ENR data is then used until it is replaced by the next edit or recall ENR data Presetting the instrument or cycling its power does not cause new ENR data to be used If desired use the front panel key to store the table in either a memory card or spectrum
40. ILE to begin using the ENR data for the noise source you are using for measurements NOTE Register prefixes NETST NFTRA and NFTRB are reserved prefixes used by the noise figure and gain personality Do not use these prefixes with your memory operations 2 28 Making Measurements Configuring for Measurements Assigning and Using Registers and Prefixes The following table defines the prefixes that appear in the catalog listing of either the memory card or spectrum analyzer memory registers Table 2 4 Prefix Descriptions of Memory Registers Register Name in Cataloo Prefix_Nescrintion Destination Selection Save to INTERNAL STATE gt INTRNL Save to INTERNAL ENR INTRNL Save to CARD State Card Save to CARD ENR gt Card rave to CARD TR ST Card ave to CARD Display gt Card TRregisternumber TRregisternumber tNFS_register number t NFENR register number tNFTST_register number NE _register number A trace register containing the event s instrument state A trace register containing the event s instrument state The t indicates the file type followed with NFS indicating a personality state The t indicates the file type followed with NFENR indicating a table of noise source excess noise ratio data e t indicates the file type followed with NFTST indicating instrument state and the traces The personality creates two idden files not visible in NF mode but disp
41. ISE readout should be lt 57 dB RL to achieve optimum results 5 Return the HP 8495A attenuator to the values determined in step 2 Measure the change in noise level between attenuator settings 6 Press MEASURE then record the value displayed on the spectrum analyzer screen in Figure 4 3 column 3 as the Noise Level Readout in dB RL 7 On the power meter press REL The power meter readout should be 0 dB You may need to press two times to ensure a O dB readout NOTE If the reading on the power meter is unstable you may need to use power meter averaging Press MNL FILTER and enter a value such as 5 to enable power meter averaging 8 Increment the step attenuators 3 dB and record the attenuator settings in Figure 4 3 columns 1 and 2 Specifications Characteristics and Verification System Performance Verification 9 Record the absolute value of the power meter reading to 2 decimal places as the Power Meter Readout in Figure 4 3 Column 5 10 Repeat steps 6 through 9 until the total attenuator setting equals 30 dB 11 Remove the 20 dB fixed attenuator from the power sensor and connect the power sensor directly to the power splitter 12 Press to establish a new power meter reference then continue making measurements as before Stop making measurements just before the Noise Level Readout on the spectrum analyzer measures less than 60 dB RL As an example If the Noise Level Readout is 58 2
42. LE 10DB 160 OUTPUT 718 _NFLVL ODB 170 OUTPUT 718 _NFSCALE 10DB 180 END Programming _INLOSS Enter the 2 dB loss that exists in the measurement setup following calibra tion and is present at the input of the device under test Enter the 3 2 dB loss that exists in the measurement setup following calibra tion and is present at the output of the device under test Enter the 0 1 dB loss that exists in the setup dur ing calibration at the out put of the noise source Calibrate the measurement setup Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait forthe key to be pressed Make a calibrated noise figure and gain measurement Set the gain trace refer ence level to 10 dB Set the scale forthe gain trace to 10 dB per division Set the noise figure trace reference level to 0 0 dB Set the scale forthe noise figure trace to 10 dB per division 6 37 Programming _INLOSS Query Response The response displays the current input loss value being used for measurement calculations output termi hator QINLOS Figure 6 27 _INLOSS Query Response Syntax LABEL Description Example Program Programming LABEL Use the LABEL command to refresh the screen annotation following the selection of conversion or non conversion with the FCONV command LABEL xlabel Figure 6 28 LABEL Syntax Use the
43. MIN LIMIT Taste GAIN MAX LIMIT MARKER FREQ et Lvl amp Scale GAIN MIN LIMIT MARKER NORMAL SWEEP CONT SGL p L p MARKER DELTA RPG Title Previous Menu Main Menu Resume Meosure Time BW Menu External Losses PREAMP GAIN SOURCE TEMP Edit ENR Data More 2 of 2 SELECT POINT SELECT FREQ SELECT AMPLITUD DELETE POINT SERIAL NUMBER Edit Done CARD gt STATE CARD gt TRACE CARD gt DISPLAY CARD gt ENR iNTERNAL CARD Previous Menu INTRN gt CARD INTERNAL gt ENR INTERNAL CARD Previous Menu This key only oppeors when POINT This key only appears when markers ore Active Figure 3 2 The NF amp Gain Personality Menu Map 3 4 i Morkers MARKERS OFF t Moin Menu ESTIMATD DUT NF ESTIMATD DUT GAIN EST TEST SYS MF ESTIMATD ENR TIME BW PRODUCT Previous Menu BANDWDTH AVG TIME AUTO MAN TIME BW PRODUCT Help Time 8W Previous Menu SOURCE LOSS INPUT LOSS OUTPUT LOSS Previous Menu SAVE STATE gt INTERNAL STATE gt CARD TRACE gt CARD DISPLAY gt CARD ENR gt CARD INTERNAL CARD Previous Menu ENR gt INTERNAL INTERNAL CARD Previous Menu pa7ta Menu Key Descriptions In this section in alphabetical order the menu keys are listed and described Refer to the previous illustration in Figure 3 2 for the location of the HP 85719A Noise Figure Measurements Personality keys Refer to Figure 3 1 for an illustration of the personality
44. MODE again to return to the noise figure measurement menu you were using Inadequate system The probe power connector on the preamplifier needs connected into the gain Check PROBE PWR input on the front panel on the spectrum analyzer or the connections and or preamplifier gain value is entered incorrectly preamp gain for error VALID CARD TYPE Make sure the memory card is installed correctly and is the right one Invalid The RF stop and start frequency span is different from the IF start and stop frequencies RF Span These must be the same start stop span nust equal IF Start stop Span 5 4 If You Have a Problem Measurement Personality Messages Table 5 1 Measurement Personality Information Messages continued Loading the log corrections routine takes a moment This message identifies Message Displayed alpha order Loading LOG corrections Newer firmware required REV 26 08 92 or later Noise card failed Noise card not installed Noise card passed Noise signal not found SAVE LOCK ON SAVE REG Setting configuration to default that time lapse The firmware in the spectrum analyzer does not support the noise figure end gain measurements DLP The noise source drive option card has exhibited trouble Make sure the noise source drive option card is properly installed The noise source drive option card is functioning properly The noise source The internal me You
45. P 60 000 MHz 800 000 MHz NF RL 6 04 dB Bandwidth 1 800 MHz 41 Pts Avg Time 0 5 sec pt RL Figure 2 15 Amplifier Measurement Results Example 2 37 Measuring a Frequency Converter To measure the noise figure and gain of a frequency converting device such as a television tuner connect the equipment bypassing the device to be tested as stated in Calibrating for Measurements and illustrated in Figure 2 12 Be sure to include all needed adapters cables and hardware required for your test To measure the noise figure and gain of a microwave converter refer to product note 85719A 1 for information about configuring for the measurement Configuring for the measurement Refer to the steps below to enter measurement parameters for the frequency converter The specific values are not included Use the values unique to the device you are testing 1 Press Conf ig in the main menu 2 Press Freq Menu then underline YES in the Conversion YES NO key e Enter the RF and IF frequencies of the device you are testing The RF and IF spans equal must be equal e The RF start frequency must correspond with the IF start frequency even if the resulting values cause a backwards sweep condition start frequency is greater than the stop frequency 3 Press Previous Menu and select POINTS e Enter a number with the front panel data keys Terminate the value with the ENTER key e If you entered POINTS 1 you can also ente
46. QNFL VL Figure 6 31 _NFLVL Query Response Syntax 6 44 Programming _NFMODE _NFMODE Use the NFMODE command to control instrument mode state Cre O XNF MOD Figure 6 32 _NFMODE Syntax Description Use the NFMODE command to initiate remote noise figure and gain mode measurements Example Program 10 OUTPUT 718 IP 20 OUTPUT 718 _NFMODE 25 OUTPUT 718 _DEFAULTS 30 OUTPUT 718 _PTS 3 40 OUTPUT 718 _FSTART 300MHZ 50 OUTPUT 718 _FSTOP 1200MHZ 60 OUTPUT 718 _CAL 70 OUTPUT 718 DONE 80 ENTER 718 DONE 90 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 95 PAUSE 100 OUTPUT 718 MEASURE Preset the spectrum analyzer Turn on noise figure mea surements personality mode Set all measurement con figuration parameters to default values Set the number of mea surement points to 3 Set the non conversion mode start frequency to 300 MHz Set the non conversion mode stop frequency to 1200 MHz Calibrate the measurement system Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Start the calibrated noise figure and gain measurement 6 45 Programming NFMODE 110 OUTPUT 718 _GLVL 10DB _GSCALE 5DB Set the gain trace refer ence level to 10 dB avail able only if the measure ment system is calibrated Set the scale for the g
47. RPG or the f and WD keys e Change the frequency value using only the front panel data keys with the frequency units key The cursor automatically moves to the next column position when you terminate data entry with a units key e Change the amplitude value with the RPG as follows or with the numerical data keys 2 25 To save ENR data tables Making Measurements Configuring for Measurements NOTE Enter the complete dB value listed on the noise source for each frequency point The personality does not display the 100 hgB value however it is accepted and used within the calculated measurement results e Press the DELETE POINT key to delete all the values of a point from the table regardless of the highlighting position in a data point e Press Edit Done to return to the previous menu The edited ENR data is used for the next measurements 3 To store the ENR data table to a memory register use the front panel key as explained in the following section To save the ENR data to memory press Edit Done then follow the steps below 1 Press the front panel key 2 Press INTERNAL CARD to underline the save destination you want to use 3 Press either ENR gt INTERNL when you have chosen spectrum analyzer memory or ENR gt CARD when you have chosen memory card memory 4 Enter the memory register number you wish to use then press ENTER on the front panel The message ENR DATA SAVED appears on the display
48. S CONTINUE WHEN READY TO MEASURE 75 PAUSE 80 OUTPUT 718 _MEASURE 90 END Query Response The response is displayed in Hz Programming BW Select the noise figure and gain measurements mode Set all measurement con figuration parameters to default values Set the time measurement bandwidth value to 300 and change the measure ment bandwidth to 1 MHz Set the averaging time to 1 second per measurement point Calibrate the measurement setup for the new parameters Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Make a calibrated noise figure and gain measurement output gt Figure 6 5 BW Query Response Syntax apts 6 13 Programming CAL The CAL command initiates the system calibration routine Figure 6 6 CAL Syntax Prerequisite Command NFMODE Description Entering the CAL command initiates the system calibration routine The device under test is not connected In addition all measurement parameters conversion RF and IF frequencies points and so forth are entered prior to executing calibration Example 20 OUTPUT 718 _NFMODE Program 30 OUTPUT 718 DEFAULTS 40 OUTPUT 718 _PTS 3 50 OUTPUT 718 _CAL 60 OUTPUT 718 DONE 70 ENTER718 DONE 80 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 85 PAUSE 90 OUTPUT 718
49. S SPECTRUM 28 VOLTS ANALYZER SWITCHED SOURCE pa78a LOSS Figure 6 47 location of Noise Source loss Characteristic Example Program 20 OUTPUT 718 _NFMODE Turn on noisejigure mea surements personality mode 30 OUTPUT 718 _DEFAULTS Set all measurement con figuration parameters to default values 40 OUTPUT 718 _PTS 3 Set the number of mea surement points to 3 50 OUTPUT 718 _FSTART 300MHZ Set the non conversion mode start frequency to 300 MHz 60 OUTPUT 718 _FSTOP 1200MHZ Set the non conversion mode stop frequency to 1200 MHz 70 OUTPUT 718 _INLOSS 2DB Enter the 2 dB loss that exists in the measurement setup following calibra tion and is present at the input of the device under test 6 65 Programming _SLOSS 80 OUTPUT 718 _OUTLOSS 3 2EDB 90 OUTPUT 718 _SLOSS 0 1DB 100 OUTPUT 718 _CAL 110 OUTPUT 718 DONE 120 ENTER 718 DONE 130 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 135 PAUSE 140 OUTPUT 718 _MEASURE 150 OUTPUT 718 _GLVL 10DB _GSCALE 10DB 160 OUTPUT 718 _NFLVL ODB _NFSCALE 5DB 170 END measurement calculations 6 66 Enter the 3 2 dB loss that exists in the measurement setup following calibra tion and is present at the output of the device under test Enter the 0 1 dB loss that exists in the measurement setup following calibra tion and is present at the output of the noise source used in the measurement Calibrat
50. User s Guide HP 85719A Noise Figure Measurements Personality HP part number 85719 90007 Printed in USA October 1992 Notice The information contained in this document is subject to change without notice Hewlett Packard makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Hewlett Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material Copyright Hewlett Packard Company 1992 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws Lotus 1 2 3 is a U S registered trademark of Lotus Development Corporation MS DOS is a U S registered trademark of Microsoft Corporation Microsoft is a U S registered trademark of Microsoft Corpora tion Hewlett Packard Software Product License Agreement and Limited Warranty Important Please carefully read this License Agreement before opening the media envelope or operating the equipment Rights in the software are offered only on the condition that the Customer agrees to all terms and conditions of the License Agreement Opening the media envelope or operating the equipment indicates your acceptance of these terms and conditions If you do not agree to the
51. V FSTART Contents 2 2 36 2 38 2 38 2 39 2 39 6 23 Command Reference ESTOP se lt i eats A A Hoos Soe Ge I 6 25 IMD ci a Bo hoe tol acted 6 27 SGSCALE sa ari a Re a a Bad 2s 6 29 ESTART took oe oh cee a HS an a 6 31 IES TOR a Baie o Oo d ee a 6 33 SENDOS Sineast ee AG Meee ha ee 6 35 LABEL 2 eat ist Oe ge kids ad ae oe ad 6 39 MEASURE 6 40 NEEVE eras to es A te BG et ea a 6 43 SNEMODE s kaik Sete a SR ie ee 6 45 NESGAGE ue oe how i ee or A ae eS 6 47 OUTLOSS ele Sete Bh ect Go le plate 6 49 PGAIN jis de 2 Sie Rect a Gs Bok a Sais os 6 53 PING E A tee sages de pte ee en a 6 55 CRESTAR coeds o sora de E Be AO 6 58 RESTOP t eso a Baek ob dw a bw 4 258 6 61 ESLOSS ot x ad wl 2 week ee ks DR ke So ee Ale 6 64 SEBW A pepe Rik tan A Nan haem ae es 6 68 BIWAUT OR ean ot a sae a a e EO a wr 6 70 ee WEP ag Seek fe Bre ae ae Shue ae ne A as 6 72 Index Contents 3 Figures l 1 Self Test Equipment Connections 1 7 2 1 Single Point Measurement Results 2 9 2 2 The Help Screen Time BW Repeatability Calculator 2 12 2 3 System Loss Location During Calibration 2 14 2 4 System Loss Location During Device Measurement 2 15 2 5 SOURCE LOSS Location During Calibration 2 16 2 6 SOURCE LOSS Location During Device Measurement 2 17 2 7 INPUT LOSS Location During Calibration 2 18 2 8 INPUT LOSS Locati
52. ain trace to 5 dB 120 END 6 46 Programming _NFSCALE _NFSCALE Use the NFSCALE command to set the reference level for the noise Egure measurement results CA O E AE AS Figure 6 33 _NFSCALE Syntax xnfsca Item Description Default Value 2 dB div Default Units dB Range 0 10 dBto 99 90dB Prerequisite Command _NFMODE Related Commands NFLVL GLVL _GSCALE Description Use the NFSCALE command to set or query the display scale for the noise Egure measurement Changing the scale does not effect system calibration therefore it can be adjusted without requiring recalibration Example Program 20 OUTPUT 718 _NFMODE Turn on noise figure mea surementspersonality mode 30 OUTPUT 7 18 DEFAULTS Set all measurement con Jiguration parameters to default values 40 OUTPUT 718 _PTS 3 Set the number of mea surement points to 3 50 OUTPUT 718 _FSTART 300MHZ Set the non conversion mode start frequency to 300 MHz 60 OUTPUT 718 _FSTOP 1200MHZ Set the non conversion mode stop frequency to 1200 MHz 6 47 Programming _NFSCALE 70 OUTPUT 718 _CAL 80 OUTPUT 718 DONE 90 ENTER 718 DONE 100 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 105 PAUSE 110 OUTPUT 718 _MEASURE 120 OUTPUT 718 _GLVL 10DB _GSCALE 10DB 130 OUTPUT 718 _NFLVL ODB _NFSCALE SDB 140 END Query Response The response displays the current scale value output Calibrate the
53. anada Berner Strasse 117 Eskdale Road Winnersh Triangle 1217 Meyrin 2 Geneva Zone D Activite De Courtaboeuf 6000 Frankfurt 56 Wokingham Berkshire RF11 502 Switzerland F 91947 Las Ulis Cedex West Germany England 141 221 780 8111 France 149 69 500006 0 44 7341 696622 33 1 69 82 60 INTERCON FIELD OPERATIONS Headquarters Australia Canada China Hewlett Packard Company Hewlett Packard Australia Ltd Hewlett Packard Canada Ltd China Hewlett Packard Company 3495 Deer Creek Rd 31 41 Joseph Street 17500 South Service Road 38 Bei San Huan XI Road Palo Alto California 943041316 Blackburn Victoria 3130 Trans Canada Highway Shuang Yu Shu 14151 857 5027 6131 895 2895 Kirkland Quebec H9J2X8 Hai Dian District Canada Beijing China 15141 697 4232 186 11 256 6888 Japan Singapore Taiwan Yokogawa Hewlett Packard Ltd Hewlett Packard Singapore Pte Ltd Hewlett Packard Taiwan 1 27 15 Yabe Sagamihara 1150 Depot Road 8th Floor H P Building lt anagawa 229 Japan Singapore 0410 337 Fu Hsing North Road 181 427 59 1311 165 273 7388 Taipei Taiwan 1886 21 712 0404 Making Measurements Making Measurements This chapter contains instructions for using the measurement personality The descriptions of the menu keys are located in Chapter 3 Menu Key Descriptions Making Measurements is organized into the following sections e Improving Noise Figure Measurement Accuracy e Configuring for Measurements Entering measurement frequen
54. analyzer register Select this key in the configuration more 1 of 2 menu to display the ENR excess noise ratio data tables for review or editing Up to 79 data points can be saved in memory the 80t register is used by the measurement personality for the noise source serial number You can edit any ENR data table saved in internal or card memory The ENR calibration factors for a noise source are used in measurement calculations to improve the accuracy of the noise figure and gain measurements Select this key from the front panel key menu when CARD is underlined in INTRNL CARD ENR INTRNL ESTIMATD DUT GAIN ESTIMATD DUT NF ESTIMATD ENR EST TEST SYS NF External Losses Menu Key Descriptions Menu Key Descriptions Pressing the ENR CARD key saves the ENR data to a register you choose Select this key from the front panel SAVE key menu when INTRNL is underlined in INTRNL CARD Pressing the ENR INTRNL key saves the ENR data to a specified spectrum analyzer memory register Select this key in the help Time BW menu to display or change the device under test estimated gain value If loss corrections are entered do not include them again in estimated DUT gain values The loss value is automatically included as part of the repeatability calculations The resulting repeatability value is displayed on the spectrum analyzer screen Select this key in the help Time BW menu to access the device und
55. andling e Retain copies of all shipping papers e Ship the instrument to one of the HP sales and service offices listed at the end of Chapter 1 Getting Started 5 7 Programming Programming This chapter is a reference for the HP 85719A Noise Figure and Measurements Personality It is a command dictionary commands are organized alphabetically The chapter contains the following information e Reference Tables e Syntax Conventions e Command Reference 6 2 Reference Tables The first reference table is organized according to function The second table lists all measurement personality commands alphabetically Functional Index Table The functional table groups the commands according to measurement personality function To find a programming command that performs a particular function first refer to the following table where commands are categorized by function Once the desired command is found in the functional index refer to the command in the chapter 6 3 Programming Reference Tables Table 6 1 Functional Index Function Group Command Ranges or Description CAL Initiate the noise figure and gain measurement setup calibration routine onfiguration DEFAULTS Sets all measurement parameters to default values Refer to Chapter 3 Other than frequency end Table 3 1 Noise Figure and Gain Default Parameters in this guide ime bandwidth contr ol Enter or recall ENR data Allows the control o
56. be pressed Make a calibrated noise figure and gain measurement Set the gain trace refer ence level to 10 dB Set the scale for the gain trace to 5 dB OGA INS Figure 6 20 _GSCALE Query Response Syntax 6 30 _IFSTART Programming _IFSTART Use the _IFSTART command to enter the IF start frequency for a frequency conversion noise figure and gain measurement Sw start frequency number 1FSTART xifsta Description Default Value 1 45 GHz Default Units Hz Range Spectrum analyzer frequency range Prerequisite Command _NFMODE Related Commands FCONV _RFSTART _RFSTOP _IFSTOP Description Use the _IFSTART command to set or query the IF start frequency value The IF start and stop frequency spans must match the RF stop and start frequency span Frequency conversion needs to be selected for these values to be active Reverse sweep such as when the IF start frequency is greater than the IF stop frequency is allowed Programming IFSTART Example 20 Program 25 30 35 40 50 60 70 80 OUTPUT 718 _NFMODE OUTPUT 718 _DEFAULTS OUTPUT 718 _FCONV 1 OUTPUT 718 _LABEL OUTPUT 718 _IFSTART 400MHZ OUTPUT 718 _IFSTOP 600MHZ OUTPUT 718 _RFSTART 650MHZ OUTPUT 718 _RFSTOP 850MHZ END Turn on noise figure mea surements personality mode Set all measurement con figuration parameters to default values Turn the frequency co
57. ch if not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met The warning sign denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning sign until the indicated conditions are fully understood and met vu WARNING CAUTION General Safety Considerations Before the spectrum analyzer is switched on make sure it has been properly grounded through the protective conductor of the ac power cable to a socket outlet provided with protective earth contact Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal can result in personal injury Before the spectrum analyzer is switched on make sure its primary power circuitry has been adapted to the voltage of the ac power source Failure to set the ac power input to the correct voltage could cause damage to the instrument when the ac power cable is plugged in ix An overview of this measurement solution This quick overview provides basic information about noise figure and gain measurement using the HP 85719A measurement solution Some main features of the noise figure and gain measurement personality are listed below e User friendly interface
58. cies Entering points to be measured Entering tune and BW parameters Entering preamplifier gain Entering noise source case temperature Editing noise source ENR data e Calibrating for Measurements e Making Measurements on an Amplifier e Making Measurements on a Frequency Converter e Making Measurements on a Mixer The measurement examples provided here use the equipment listed in Table 2 1 on the following page Other equipment can be substituted if the critical specifications are accommodated 2 2 Making Measurements Using the Self Test Feature Table 2 1 Equipment Requirements Instrument Model Number Specifications HP B59XE Series Spectrum Analyzer HP 8591E HP 8593E HP 8594E HP 8595E 859XE series firmware and hardware or HP 8596 Noise Source HP 346B Noise Source Option 0011 Frequency range 10 MHz to 2 9 GHz ENR 14 to 16 dB 0 MHz to 30 MHz SWR 1 3 30 MHz to 2 9 GHz SWR 1 15 Power raouiramant 28 Vde 1 Vacl System Preamplifier HP 87405A Probe Powered Preamplifier Frequency Range 10 MHz to 2 9 GHz oise Figure 7 5 dB nput SWR 2 1 maximum Probe power bias connector 2 3 Improving Noise Figure Measurement Accuracy You can improve the accuracy of a noise figure measurement by following the suggestions listed below Use RF precautions with the equipment setup Some of these are listed below Tighten measurement connections and avoid using non threaded connectors such as the BNC style c
59. ct the noise figure and Program gain measurements mode 20 OUTPUT 718 _DEFAULTS Set all measurement con figuration parameters to default values 30 OUTPUT 718 _TBW 300 Set the time measurement bandwidth value to 300 40 OUTPUT 718 _TBWAUTOO Set the averaging time mode to manual 6 70 45 OUTPUT 718 _AVGTIME 1 50 OUTPUT 718 _CAL 60 OUTPUT 718 DONE 70 ENTER 718 DONE 80 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 85 PAUSE 90 OUTPUT 718 _MEASURE 100 END Programming TBWAUTO Set averaging time to 1 second per measurement point Calibrate the measurement setup for the new parameters Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Make a calibrated noise figure and gain measurement Query Response The response displays the current time bandwidth measurement mode If a 1 is returned the mode is automatic If a O is returned the mode is manual and the measurement time and bandwidth settings are determined by you Se Figure 6 52 TBWAUTO Query Response Syntax QTBWAU 6 71 Programming _TEMPC Use the TEMPC command to enter the celsius case temperature value of the noise source used for making measurements celsius temperature xtempe Figure 6 53 _TEMPC Syntax Description Default Value 21 C Default Units 70 Range 273
60. ct this key in the external losses menu to enter the dB loss value located at the input of the device under test The loss is entered and due to components required in the test setup for making measurements but the components were not included in test setup calibration Select this key from the front panel SAVE or key menus Pressing the INTRNL CARD key underlines and designates either internal or card as the memory location Select this key from the front panel key menu when INTRNL is underlined in INTRNL CARD Pressing the INTRNL ENR key catalogs the internal memory ENR data registers Use the arrow keys or the RPG to highlight the ENR data of interest Use the LOAD FILE key to recall the register contents This ENR data is used for all measurements until new ENR data is recalled edited or saved Select this key from the front panel key menu when INTRNL is underlined in INTRNL CARD Pressing the INTRNL STATE key catalogs the internal memory state registers Use the arrow keys or the RPG to highlight the instrument state of interest Use the LOAD FILE key to recall the register contents Select this key in the measurements menu to select the marker menu A new key labeled MARKERS OFF appears after the Markers key is selected Markers are not activated by pressing Markers but by pressing any marker function key in the marker menu Select this key in the marker menu to get a delta readout between points along bot
61. dB RL stop testing becausethenext Noise Level Readout would be lt 60 dB RL Enter the measured results into the Figure 4 3 as explained in the steps and illustrated in the example table below 1 Begin with the value of the first measurement in Column 3 Noise Level Readout 2 Subtract the first measurement value from the second measurement value recorded in Column 3 3 Enter the resulting difference into column 4 Change in Noise Level 4 Subtract the second reading recorded in Column 3 Noise Level Readout from the third reading Again record the resulting difference in Column 4 5 Continue finding adjacent measurement differences and recording the results in column 4 As an example If the first Noise Level measurement 7 20 dB RL and the second Noise Level measurement 10 28 dB RL the resulting Change in Noise Level 3 08 dB 4 12 Column 1 10 dB Attenuator Settings dB Column 2 1dB Attenuator Settings dB Specifications Characteristics and Verification System Performance Verification Example of the Noise Level Worksheet for RBW 1 MHz Column 6 Deviation in Noise between Readout level Readout Adjacent Steps BR dB NAL Find the deviation between adjacent steps 1 Subtract the absolute value recorded in Power Meter Readout Column 5 from the absolute value recorded in Change in Noise Level Column 4
62. dia within a reasonable amount of time Customer s alternate remedy shall be a refund of the purchase price upon return of the product and all copies Notice of Warranty Claims Customer must notify Hewlett Packard in writing of any warranty claim not later than thirty 30 days after the expiration of the warranty period Limitation of Warranty Hewlett Packard makes no other express warranty whether written or oral with respect to this product Any implied warranty of merchantability or fitness is limited to the 1 year duration of this written warranty This warranty gives specific legal rights and Customer may also have other rights which vary from state to state or province to province vi Exclusive Remedies The remedies provided above are Customer s sole and exclusive remedies In no event shall Hewlett Packard be liable for any direct indirect special incidental or consequential damages including lost profit whether based on watranty contract tort or any other legal theory Warranty Service Warranty service may be obtained from the nearest Hewlett Packard sales office or other location indicated in the owner s manual or service booklet CAUTION WARNING Safety Symbols The following safety symbols are used throughout this manual Familiarize yourself with each of the symbols and its meaning before operating this instrument The caution sign denotes a hazard It calls attention to a procedure whi
63. e output of the noise source used in the measurement Calibrate the measurement setup Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Set the gain trace refer ence level to 10 dB Set the scale for the gain trace to 10 dB per division Set the noise figure trace reference level to 0 0 dB Set the scale for the noise figure trace to 5 0 dB per division Programming _OUTLOSS Query Response The response displays the current output loss value being used for measurement calculations output termi hator QOUTLO Figure 6 37 OUTLOSS Query Response Syntax 6 52 Programming _PGAIN _PGAIN Use the PGAIN command to select the number of measurement points gt Figure 6 38 _PGAIN Syntax xpgain l Item Description Default Value Default Units dB Range Ot o 99 90d Prerequisite Command _NFMODE Description Use the _PGAIN command to enter or query the minimum gain of the preamplifier used in the measurement system If the HP 87405A probe powered preamplifier is used the 22 0 dB default setting is automatic For other preamplifiers enter the appropriate gain Example 20 OUTPUT 718 _NFMODE Turn on noise figure mea Program surements personality mode 30 OUTPUT 718 _DEFAULTS Set all of the measurement parameters to the default values 40 OUTPUT 718 _PGAIN 12 Set the preamplifier gain to 12 dB 5
64. e card hardware is working properly Select this key in the edit ENR data menu to enter the four digits of the noise source s serial number if desired The serial number is not used as the label in the memory registers however it appears on the spectrum analyzer display during measurements when the ENR data is active Select this key in the measurements menu to set the spectrum analyzer to single sweep or continuous sweep mode The single sweep function begins after the existing measurement sweep is completed Select this key in the losses menu to enter the loss compensation factors that exist due to the noise source Select this key in the configuration more 1 of 2 menu to enter the noise source case temperature The range of this parameter is 273 0 C to 999 9 C The preset temperature value is 21 C Environmental Temperature Testing If you are testing devices in extreme temperatures conditions the value you enter serves as a correction to measurement results START FREQ Select this key in the frequency menu to enter the start frequency setting of a non frequency conversion measurement The range of frequencies is from 100 kHz to the upper frequency limit of the spectrum analyzer STATE gt CARD STATE gt INTRNL STOP FREQ Test Limit Time BW Menu Menu Key Descriptions Menu Key Descriptions Select this key from the front panel SAVE_ key menu when CARD is underlined in INTRNL CARD P
65. e the figure and gai ode Ini easure ivates noise ise figure and igu ially gai ode Ini easure ivates noise ise fi igu ially gure and gai 99 90 dB query the 0 00 to Enter o efe 0 10 to er 0 99 90 dB query t e measu 00 to 99 90 dB er or query the refere 10 dB to 99 90 dB er or query the dB div easu 100 0 ms to 999 0 s Enter or query th e measure easurement ave time per measure 0 kHz to 5 ter or que MHz y th to 100000 or query easurement ba te he time bandwidth p 1 lauto mode selected 0 manual mo Select or query the time bandw idth measu ent co ent co ce level for ement scale Programming Reference Tables is affixed to the input of the oss affixed to the output of the device e affixed to the output of the nois ement required before sending or queryin mands quired before sending or queryini mands re e gain trace or the gain trace ce level for the noise figure trace ement scale for the noise figure trace in aging time value The value affect ent point dwidth oduct in kHz seconds de selected ode 6 5 Programming Reference Tables Alphabetical Reference Table The following table listing describe the commands available with the noise figure and gain measurements personality Prior to using any of the f
66. e the measurement setup Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Set the gain trace refer ence level to 10 dB Set the scale for the gain trace to 10 dB per division Set the noise figure trace reference level to 0 0 dB Set the scale for the noise figure trace to 5 0 dB per division Query Response The response displays the current output loss value being used for output Figure 6 48 SLOSS Query Response Syntax Programming SLOSS Programming _TBW Use the TBW command to enter the time bandwidth product for use in measurements kHz seconds XTBW Figure 6 48 _TBW Syntax ee o Default Value 500 kHz s Default Units kHz s Range 1 to 16 000 kHz s or 1to 999 x BW linkHzl whichever is less Prerequisite Command _NFMODE Relates Commands TBWAUTO B W Description Use the TBW command to enter or query the time bandwidth product The time bandwidth product is used to calculate an averaging time appropriate for a given measurement bandwidth when TBW AUTO mode is selected Refer to the TBWAUTO command The time bandwidth product affects the measurement to measurement repeatability An increase in time bandwidth reduces the repeatability error Example 10 OUTPUT 718 _NFMODE Select the noise figure and Program gain measurements mo de 20 OUTPUT 718 DEFAULTS Set al
67. eatability error to approximately half its current amount quadruple the value of the time BW product To enter external losses Making Measurements Configuring for Measurements To enter external losses If you plan to use hardware or cables that have known losses you can enter these values into the measurement configuration settings When you are correcting for external losses accurate loss values should be used to prevent introducing errors into the device measurements The loss corrections are also included in the repeatability error calculations There are four points that can contribute loss into the measurement One of the four points is the measurement setup loss Do not enter corrections for the loss encountered at the point illustrated in Figure 2 3 and Figure 2 4 Measurement setup loss is automatically factored into the final measurement result To enter corrections for the remaining three loss locations refer to the information below 1 Press External Losses Enter known loss values designated as System Loss this value is not entered into the measurement manually SOURCE LOSS INPUT LOSS OUTPUT LOSS 2 13 Making Measurements Configuring for Measurements SPECTRUM ANALYZER 28 VOLTS SWITCHED NOISE SOURCE SYSTEM pa713a LOSS Figure 2 3 System Loss Location During Calibration 2 14 Making Measurements Configuring for Measurements SPECTRUM
68. ements Corrections entered with the INPUT LOSS and OUTPUT LOSS keys should not be included For calibrated measurements changing a measurement parameter re configuring requires a new calibration except for those listed in the note at the bottom of page 2 30 Remove the DUT from the setup before recalibration The front panel CAL key is available anytime during the noise figure and gain measurements to calibrate the system for accurate noise figure measurements The gain trace does not appear until the measurement system is calibrated CARD gt DISPLAY 3 6 The calibration data is used to calculate the corrected noise figure and gain results When a calibration is performed the noise is measured for each selected calibration point The calibration points are equally spaced between the start and stop frequency settings The number of points and the frequency values are set in the Calibration menu If these values are changed recalibration is required for measurement accuracy You can change the reference level and scale values during measurements to improve trace readability without re calibrating the setup Select this key from the front panel key menu when CARD is underlined in INTRNL CARD Pressing the CARD DISPLAY key catalogs the arrow keys or the RPG to highlight the instrument CARD ENR CARD gt STATE Config Conversn YES NO Menu Key Descriptions Menu Key Descriptions display of i
69. ents as before Stop making measurements just before the Noise Level Readout on the spectrum analyzer measures less than 60 dB RL Enter the measured results into the Figure 4 4 Refer to the following steps 1 Begin with the value of the first measurement in Column 3 Noise Level Readout 2 Subtract the first measurement value from the second measurement value recorded in Column 3 3 Enter the resulting difference into column 4 Change in Noise Level 4 Subtract the second reading recorded in Column 3 Noise Level Readout from the third reading Again record the resulting difference in Column 4 5 Continue finding adjacent measurement differences and recording the results in column 4 Find the deviation between adjacent steps 1 Subtract the absolute value recorded in Power Meter Readout Column 5 from the absolute value recorded in Change in Noise Level Column 4 4 16 Purge the service OLP from memory Specifications Characteristics and Verification System Performance Verification 2 Record the absolute value of the results in Column 6 as the Deviation Between Adjacent Steps 3 Find the value of the largest change in Column 6 as the Deviation between Adjacent Steps and record the LARGEST DEVIATION below LARGEST DEVIATION __________ dB 4 Press DEVIATN Use the front panel DATA keys and enter the value recorded above then press ENTER The display readout
70. er test estimated noise figure value The value of the DUT noise figure is used in the Help Time BW menu repeatability calculator Input loss and output loss effects are included automatically Select this key in the Help Time BW menu to access the estimated ENR value The averaged ENR value is acceptable The amount of if any noise source input loss is subtracted automatically from the estimated ENR factor Select this key in the Help Time BW menu to display or change the estimated test system noise figure value The loss present if any at the system input during calibration needs to be included Select this key in the configuration more 1 of 2 menu to enter loss compensation values associated with the test setup Determine these losses before setting up for measurements Losses are due to components such as isolators and cables that are required for making a measurement The measurement personality applies the loss corrections to the measurement results Menu Key Descriptions Menu Key Descriptions Freq Menu GAIN MAX LIMIT GAIN MIN LIMIT GAIN REF LEVEL GAIN SCALE Help Time BW IF START FREQ IF STOP FREQ Select this key in the configuration menu to display the frequency settings menu The menu keys that appear are different for conversion versus non conversion parameters Select this key which appears only if the number of points J in the test limits menu Select this key to display or change the
71. essages that were displayed and enclose a copy of this information with the instrument being returned e Fill in a blue service repair card located at the end of this chapter Enclose the card with the instrument being returned Repackage the HP 85719A measurements personality memory card and spectrum analyzer in the original packaging materials or with commercially available materials described in the following steps 1 Wrap the instrument in anti static plastic to reduce the potential of electrostatic discharge damage 2 Use the original materials or a strong shipping container that is double walled corrugated cardboard carton with 159 kg 350 Ib bursting strength The carton must be both large enough and strong enough to accommodate the instrument and allows at least three to four inches on all sides for packaging materials 3 Surround the instrument with at least three to four inches of packaging material or enough to prevent the instrument from shifting within the carton If packaging foam is unavailable the best alternative is SD 240 Air Cap from Sealed Air Corporation in Commerce CA 90001 The pink colored Air Cap does not contribute to static charge Wrap the instrument several times in this material to both protect the instrument and prevent shifting within the carton Seal the shipping container with strong nylon adhesive tape e Mark the shipping container FRAGILE HANDLE WITH CARE to encourage careful h
72. f external equipment via the auxiliary interface nector during the noise figure mode or noise figure calibration conversion on O conversion off ect or query the frequency conversion mode o 401 Points er or query the number of frequency points measured O Ct o 1000 er or query the noise source case temperature i PE Tequency non conver sion FSTART equency ra spectrum analyzer ter or query the measurement start frequency value All frequency alues are converted to Hz _FSTOP non conversion equency range of spectrum analyzer ter or query the measurement start frequency value All frequency lues are converted to Hz Tequency Conversion _ FSTART o 26 5 GHz ter or query t IF start frequency _IFSTOP equency range alyzer ter or query t IF stop frequency RFSTART 0 Hz to 999 G ter or query RF start frequency RFSTOP 0 KHz to 999 ter or query t RF stop frequency Function Group Veasuring IF Mode Control teference Level and Scale ime Bandwidth Table 6 1 Functional Index continued Ranges or Description INLOSS OUTLOSS SLOSS MEASURE NFMODE GLVL GSCALE NFLVL NFSCALE AVGTIME BW TBW _TBWAUTO er or que e value of loss that vice under yt test er or que e value of der test oss valu e e value of e measure er or que urce used i itiat
73. fications Characteristics and Verification System Performance Verification making measurements This data is used in subsequent calculations DEVIATN Press this key to calculate the noise figure and gain accuracy The verification test determines the largest deviation in adjacent 3 dB steps The deviation data is entered into the spectrum analyzer and the resultant calculation is displayed SELF TEST Select this key if the HP 85719A noise figure measurements personality is installed to initiate an additional self test procedure The function checks the current from the rear panel 28 Vdc supply and checks that the noise card hardware is working properly MEASURE Press this key during the verification test and the spectrum analyzer sweeps then displays the results of the measurement in dB RL Verification Test Description Performance verification of the spectrum analyzer hardware is achieved by measuring the accuracy of changes in noise power over an input range of 7 dB RL to 60 dB RL in 3 GB steps Ultimately the test Ends the largest deviation between adjacent 3 dB steps This data is used to calculate the noise accuracy and gain The test begins with a large noise signal applied to the spectrum analyzer input The noise level is reduced 3 dB and the difference in the trace level is measured This measurement is achieved with the service DLP included on the HP 85719A noise measurements personality ROM card System noise er
74. h the noise figure and gain traces The separate readouts appear in the upper left hand corner of the display Menu Key Descriptions Menu Key Descriptions MARKER FREQ MARKER NORMAL MARKERS OFF Main Menu Measure Select this key in the marker menu to position the marker at a specific frequency Use the front panel data keys to enter specific frequency values Avoid using the RPG as its response time is very slow in this mode Press the MARKER NORMAL key to use the RPG and get a frequency readout Select this key in the marker menu use normal marker operation The marker readout appears in the upper left hand corner of the display Use the RPG to locate the markers on the trace Select this key to turn off the markers on the noise figure and gain traces This key only appears after markers are activated with the Markers key Select this key from the configuration or measurements menu to display the top level menu of the noise figure and gain measurements personality The main menu keys are listed below CAL e Measure Config DEFAULT CONFIG SELF TEST DISPOSE NF amp GAIN Select this key from the main menu after completing measurement configuration to measure the noise figure and gain characteristics of a device Menus that follow allow you to use the marker function to evaluate measurement results You can also enter a label and store the measurement results in either spectrum analyzer or memory ca
75. have been completed Either accept the default configuration values or refer to Table 6 2 for the list of commands available for setting measurement configuration The measurement results are located in the traces NF and GAIN The element 1 corresponds with the start frequency and the element 401 corresponds with the stop frequency Description of Variables Array or Variable Name Description NF The 401 point trace _NF holds the noise figure measurement date hundredths of a dB The 401 point trace GAIN holds the gain measurement data Divide the results by 100 to convert date to dB 6 40 Example Program 20 30 40 45 50 60 70 80 90 OUTPUT 718 _NFMODE OUTPUT 718 _DEFAULTS OUTPUT 718 _FCONV 1 OUTPUT 718 _LABEL OUTPUT 718 _IFSTART 400MHZ OUTPUT 718 _IFSTOP 600MHZ OUTPUT 718 _RFSTART 650MHZ OUTPUT 718 _RFSTOP 850MHZ OUTPUT 718 _CAL 100 OUTPUT 718 DONE 110 ENTER 718 DONE 120 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 125 PAUSE Programming MEASURE Turn on noise figure mea surementspersonality mode Set all measurement con figuration parameters to default values Turn the frequency con version mode ON Redraw display annota tion for frequency conver sion made measurement state Set the frequency conver sion measurement IF start frequency to 400 MHz Set the frequency conver sion measurement IF stop freq
76. have saved The default sett signal is not present during the self test routine ory SAVE LOCK is locked o memory gs for the measurement personality are being recalled for use If You Have a Problem Measurement Personality Messages Table 5 1 Measurement Personality Information Messages continued Message Displayed Description aloha order Single frequency When points l you can enter test limits for the measurement Refer to the mode Test limits nenu key descriptions for more information may be entered State recalled you have recalled a state from me te saved ave saved the instrument state ting noise card oise source drive option card operation is getting tested Traces state ave recalled a state end traces from memory recalled Traces amp state You have saved traces and the associated state saved Warning Nhen you went to measure calibrated noise figure end gain any configuration Recalibration yarameters changes made prior to or during a measurement requires that you needed if apeat the noise figure end gain calibration routine However you can measure measurement yoise figure without recalibrating but not gain parameters are changed Returning the Instrument for Service In the event that you need to return your spectrum analyzer to the factory for service on the noise figure and gain measurement personality refer to the steps below e Record any error m
77. he copyright notice s included with the software who shall be authorized to hold the Customer responsible for any copyright infringement or violation of this License Agreement iv Transfer of Rights in Software e Customer may transfer rights in the software to a third party only as part of the transfer of all their rights and only if Customer obtains the prior agreement of the third party to be bound by the terms of this License Agreement e Upon such a transfer Customer agrees that their rights in the software are terminated and that they will either destroy their copies and adaptations or deliver them to the third party e Transfer to a U S government department or agency or to a prune or lower tier contractor in connection with a U S government contract shah be made only upon their prior written agreement to terms required by Hewlett Packard Sublicensing and Distribution e Customer may not sublicense the software or distribute copies or adaptations of the software to the public in physical media or by telecommunication without the prior written consent of Hewlett Packard Termination e Hewlett Packard may terminate this software license for failure to comply with any of these terms provided Hewlett Packard has requested Customer to cure the failure and Customer has failed to do so within thirty 30 days of such notice Updates and Upgrades e Customer agrees that the software does not include future updates and u
78. ipment Connections 1 From the measurement personality s main menu press SELF TEST 2 Set up the test equipment as described on the display then press 3 Wait approximately 2 minutes for the system to complete the procedure 4 With PASS status you can continue with measurement configuration If the self test finds trouble problem continues refer to the return for service information that follows e Make sure the noise source drive signal from the spectrum analyzer s rear panel 28 VOLTS SWITCHED is connected to the noise source e Make sure the HP 87405A preamplifier probe power connector is inserted into the spectrum analyzer PROBE PWR connection e Check that the noise source and preamplifier are properly connected 1 7 If the trouble persists Sales and service offices listing Getting Started Using the Self Test Feature e Check that the Option 119 card is getting recognized by the spectrum analyzer Press the front panel MODE key Press the Spectrum Analyzer softkey Press then More 1 of 3 Press SHOW OPTIONS 119 NOISE should be displayed e Re run the self test For any error messages generated by the measurement personality refer to Chapter 5 If You Have a Problem in this guide If the self test continues to find a problem and all of the items above are correct the instrument may need service Refer to the recommendations below e Copy any error messages onto a sheet of paper
79. iption Default Value Default Units dB Range 99 90 dBto 99 90 dB Prerequisite Command _NFMODE Related Commands DUTLOSS SLOSS 6 35 Description Example Program Programming _INLOSS Use the INLOSS command to enter or query the dB loss value set for the input of the device under test as illustrated in Figure 6 26 The loss value is based on cables and other loss factors that are in the measurement system Generally a positive input loss value is entered A negative input loss value indicates additional gain is present 25 30 40 50 6 36 SPECTRUM ANALYZER 28 VOLTS SWITCHED pa79a Figure 6 26 Location of Input Loss Characteristic OUTPUT 718 _NFMODE OUTPUT 718 _DEFAULTS OUTPUT 718 _PTS 3 OUTPUT 718 _FSTART 300MHZ OUTPUT 718 _FSTOP 1200MHZ Turn on noise figure mea surements personality mode Set all measurement con figuration parameters to default values Set the number of mea surement points to 3 Set the non conversion mode start frequency to 300 MHz Set the non conversion mode stop frequency to 1200 MHz 60 OUTPUT 718 _INLOSS 2DB 70 OUTPUT 718 _OUTLOSS 3 2DB 80 OUTPUT 718 _SLOSS 0 1DB 90 OUTPUT 718 _CAL 100 OUTPUT 718 DONE 110 ENTER 718 DONE 120 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 125 PAUSE 130 OUTPUT 718 _MEASURE 140 OUTPUT 718 _GLVL 10DB 150 OUTPUT 718 _GSCA
80. is used by the personality for measurement calculations Be sure that the ENR data table your measurement is using is the one you want If you entered the noise source s serial number look for it in the upper right hand corner of the display To edit ENR data tables Press Conf ig More 1 of 2 then Edit ENR Data The currently active ENR table data table is displayed Refer to Figure 2 11 for an example of an ENR table Making Measurements Configuring for Measurements The ENR data table editor screen SELECT FREQ FREQUENCY AMPLITUDE SECS 5 SELECT AMPLITUD 1 9 2 3 DELETE 3 it POINT 4 3 El 9 6 2 SERIAL 9 NUMBER 8 si 2 Ea Edit Done R Figure 2 11 The ENR Data Table Editor Screen When the ENR menu is first entered the SERIAL NUMBER key is highlighted For identification purposes you may use the front panel data keys followed with the ENTER key to assign the noise source s serial number to the data table The noise source serial number however is not used as an identification label within memory registers It does appear however on the display when the ENR data is active To enter the ENR data specific to the noise source you are using refer to the following steps l Press SELECT POINT SELECT FREQ or SELECT AMPLITUD to edit an existing ENR data point 2 Change the cursor position or table values as explained below e Change the data point location with the front panel
81. ispose previously installed DLPs The measurement program requires most of the user memory in the spectrum analyzer Refer to the steps below to dispose previously installed user programs 1 Press PRESET on the spectrum analyzer 2 Erase the current user program DLP from user memory e Most DLPs include a DLP dispose menu key Locate and press the dispose key often labeled DISPOSE and the DLP name if a personality is currently installed e If a DLP dispose key is unavailable press the front panel key Press More 2 of 3 then press DISPOSE USER MEM two times 1 4 Getting Started Installing the Measurement Personality To load the noise figure and gain measurement DLP After the memory is cleared insert the HP 85719A measurement personality card into the spectrum analyzer s card reader slot Insert the memory card correctly The measurement card illustrates correct orientation with an arrow and label To load the noise figure and gain DLP refer to the following steps 1 Press the spectrum analyzer front panel RECALL key 2 Underline CARD in the INTERNAL CARD menu key 3 Press CATALOG CARD then the CATALOG ALL menu key 4 If needed use the f and J keys to highlight the measurement personality file The label of the file will resemble the following with different numbers and dates GNF DLP 310 167 20 26 38 12 AUG 1992 5 Press LOAD FILE and wait about 40 seconds while the highlighted file is insta
82. it noise source ENR data To edit ENR data tables To save ENR data tables To recall ENR data tables E Assigning and Using Registers and Prefixes Calibrating for Measurements Pode on es Making Hard Copies Measuring an Amplifier Configuring for the measurement Calibrate the measurement setup i Hi p p A pi pi p p pt COON ARM oP Ho q A SS 2 29 2 30 2 33 2 34 2 34 2 35 Contents 1 Command Reference To measure the amplifier Measuring a Frequency Converter 2 Configuring for the measurement Calibrate the measurement setup To measure a frequency converting device 3 Menu Key Descriptions Menu Map nA Menu Key Descriptions 4 Specifications Characteristics and Verification Specifications and Characteristics System Performance Verification Service Test Function Keys Descriptions Verification Test Description Related Spectrum Analyzer Adjustments Equipment required for the measurement Calibrate the System Load the Service DLE i ONES ea i ee Measure the Noise Level at 1 MHz RBW ri Measure the Noise Level at 3 kHz RBW Purge the service DLP from memory If Verification Fails 5 If You Have a Problem Measurement Personality Messages Returning the Instrument for Service 6 Programming Reference Tables Functional Index Table Alphabetical Reference Table Command Syntax Description Command Reference AVGTIME BW CAL CONN ENR FCON
83. ity corrections Pleasg calculates new correction values This massage identifies that there is a time wait lapse Connect noise Connect the noise source output to the INPUT 50 2 connector on the system source Press the preamplifier and calibrate the system ky again to begin calibration DLP will be Pressing the DISPOSE key in a down loadabla program erases the DLP disposed Press the from memory key again if you are sure 5 3 If You Have a Problem Measurement Personality Messages Table 5 1 Measurement Personality Information Messages continued Message Displayed Description alpha order ta recalled ave recalled ENR data from memory R data saved ave saved ENR data in memory ENR data selected ave chosen ENR data Excessive gain or The measurement personality has encountered a signal that is above the signal present expected measurement range If the DUT gain is in excess of the specifications in Table 4 1 attenuate its output and enter the output loss correction If a Spurious signal is present eliminate the signal or change the frequency range o points to miss the signal If your measurement is at low frequencies chose arrow enough measurement bandwidth to avoid the O Hz spectrum analyzer LO feedthrough signal You can also press the front panel MODE key switch to spectrum analyzer ode and evaluate the information in the signal you are measuring Press
84. l measurement con figuration parameters to default values 30 OUTPUT 718 _TBW 300 Set the time measurement bandwidth value to 300 40 OUTPUT 718 _CAL Calibrate the measurement setup for the new parameters 6 68 Programming TBW 50 OUTPUT 718 DONE Query the spectrum ana lyzer for the calibration routine status 60 ENTER 718 DONE Get the status condition 70 DISP CALIBRATION DONE PRESS Display the calibration CONTINUE WHEN READY TO MEASURE done message 75 PAUSE Wait for the key to be pressed 80 OUTPUT 718 _MEASURE Make a calibrated noise Jigure and gain measurement 90 END Query Response The response displays the time bandwidth product used when auto mode is selected output tefmi Rator aTew Figure 6 50 TBW Query Response Syntax Programming _TBWAUTO _ Use the TBWAUTO command to select either automatic or manual time bandwidth mode for use in measurements TBWAUTO xtbwau Figure 6 51 TBWAUTO Syntax Description Default Value 1 ON Default Units none Range 1 ON or O 0FF Prerequisite Command _NFMODE Related Commands _TBW _BW _AVGTIME Description Use the TBWAUTO command to enter or query the measurement time bandwidth mode The automatic tune bandwidth mode provides an automatically calculated averaging time The calculations are derived from the time bandwidth product divided by the measurement bandwidth Example 10 OUTPUT 718 _NFMODE Sele
85. layed in spectrum alyzer mode labeled tNFTRA and tNFTRB followed with e register number dicates the file type followed with NFI indicating a image 2 29 Calibrating for Measurements The calibration procedure minimizes the effects of losses noise and gain factors due strictly to the measurement setup After entering the measurement configuration information calibrate the measurement setup The calibration data is stored and available for the current measurement configuration If you cycle power the configuration information is not changed however a new calibration is recommended before you resume measuring especially if the instrument temperature has changed Calibration requires the following e The device to be tested is not connected e The measurement configurations are determined e The noise source is connected e The preamplifier is connected NOTE You can make noise figure measurements without completing calibration However the gain measurement will not be made no gain trace displayed An additional error occurs in the measurement results when calibration is bypassed The error is especially noticeable when low gain devices under test are measured 2 30 Making Measurements Calibrating for Measurements 28 VOLTS SWITCHED SPECTRUM ANALYZER PREAMPLIFIER NOISE SOURCE pa72a Figure 2 12 Basic Calibration Setup For calibration
86. lled 6 Press to display the NF amp GAIN measurement personality softkey 7 Press the NF amp GAIN key to enter the measurement personality After a moment the main menu is displayed To re enter spectrum analyzer mode press MODE then press Spectrum Analyzer NOTE Traces A B and C are used by the Noise Figure Measurements Personality Any data in these traces will be overwritten when in noise figure mode Traces can be saved Saved traces will not be affected by mode changes 1 5 Using the Self Test Feature This section contains procedures to help you verify whether the noise source drive option card is properly installed and working on the Option 119 spectrum analyzer NOTE If you are verifying a retrofitted HP 859XE spectrum analyzer refer to the instructions included with the retrofit kit Using the self test function The self test function checks that the noise source drive option card is properly installed and working To verify proper hardware function connect the equipment as illustrated in Figure 1 1 then refer to the steps below NOTE Generic 8590E Series spectrum analyzer front and rear panel illustrations are used throughout this guide Depending on the model number and options your spectrum analyzer front and rear panels may be different 1 6 Getting Started Using the Self Test Feature PREAMPL IF IER NOISE SOURCE pa 2a Figure l l Self Test Equ
87. loss value indicates additional gain is present SPECTRUM 28 VOLTS ANALYZER SWITCHED PREAMPLIFIER NOISE SOURCE EA p y OUTPUT pa710a LOSS Figure 6 36 location of Output Loss Characteristic Example Program 20 OUTPUT 718 _NFMODE Turn on noise figure mea surements personality mode 30 OUTPUT 718 DEFAULTS Set all measurement con figuration parameters to default values 40 OUTPUT 718 _PTS3 Set the number of mea surement points to 3 50 OUTPUT 718 _FSTART 300MHZ Set the non conversion mode start frequency to 300 MHz 6 50 60 OUTPUT 718 _FSTOP 1200MHZ 70 OUTPUT 718 _INLOSS 2DB 80 OUTPUT 718 _OUTLOSS 3 2EDB 90 OUTPUT 718 _SLOSS 0 1DB 100 OUTPUT 718 _CAL 110 OUTPUT 718 DONE 120 ENTER 718 DONE 130 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 140 OUTPUT 718 _MEASURE 150 OUTPUT 718 _GLVL 10DB _GSCALE 10DB 160 OUTPUT 718 _NFLVL ODB _NFSCALE 5DB 170 END Programming _OUTLOSS Set the non conversion mode stop frequency to 1200 MHz Enter the 2 dB loss that exists in the measurement setup following calibra tion and is present at the input of the device under test Enter the 3 2 dB loss that exists in the measurement setup following calibra tion and is present at the output of the device under test Enter the 0 1 dB loss that exists in the measurement setup following calibra tion and is present at th
88. maximum gain limit settings The range of settings is from 99 90 dB to 99 90 dB Select this key which appears only if the number of points in the test limits menu Select this key to display or change the minimum gain limit settings Test limit measurement results are displayed during single point measurements Select this key in the reference level and scale menu to display or change the gain reference level setting for a measurement The scale range is from 0 10 dB div to 99 90 dB div Select this key reference level and scale menu to display or change the gain scale setting for a measurement The scale range is from 0 10 dB div to 99 90 dB div Select this key in the frequency menu to display the repeatability calculator The calculator can help you determine values to control the measurement repeatability factor Select this key in the frequency menu when conversion is set to YES Enter the IF start frequency for frequency conversion measurements The frequency range corresponds with the upper frequency limit of the spectrum analyzer in use Select this key in the frequency menu when conversion is set to YES Enter the IF stop frequency for frequency conversion measurements The frequency range corresponds with the upper frequency limit of the spectrum analyzer in use INPUT LOSS INTRNL CARD INTRNL ENR INTRNL STATE Markers MARKER DELTA Menu Key Descriptions Menu Key Descriptions Sele
89. measurement system Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Start the calibrated noise figure and gain measurement Set the gain trace refer ence level to 10 dB Set the scale for the gain trace to 10 dB per division Set the noise figure trace reference level to 0 0 dB Set the scale for the noise figure trace to 5 0 dB per division ONFSCA Figure 6 34 _NFSCALE Query Response Syntax Programming _OUTLOSS _OUTLOSS Use the OUTLOSS command to correct for the dB loss value that exists at the output of the device under test before the input to the system preamplifier NOTE If the loss is present when the calibration is made do not enter a loss value with this command These losses are introduced into the measurement setup after calibration is completed OUTLOSS XOUTLO Figure 6 35 _OUTLOSS Syntax Item Description Default Value Default Units dB Range 99 90 to 99 90 dB Prerequisite Command _NFMODE Related Commands INLOSS SLOSS Programming _QUTLOSS Description Use the OUTLOSS command to enter or query the dB loss value set for the output of the device under test as illustrated in Figure 6 36 The loss value is due to cables and other loss factors that are required in the measurement system Generally a positive output loss value is entered A negative output
90. mode is selected the specified RF start and stop frequencies are used to look up ENR data while the measurement is tuned to the IF frequencies during a measurement When non frequency conversion mode is selected the ENR data corresponding to the measurement frequency is used Following a transition from frequency conversion to non frequency conversion mode send the LABEL command to update redraw the screen annotation 6 20 Example Recall ENR datafromthe memory card 20 OUTPUT 718 _NFMODE 30 OUTPUT 718 _DEFAULTS 40 OUTPUT 718 MSI CARD 50 OUTPUT 718 LOAD tNFENR_33 TRC 60 OUTPUT 718 MOV _ENR TRC 70 OUTPUT 718 _FCONV 1 80 OUTPUT 718 _LABEL 90 OUTPUT 718 _IFSTART 400MHZ 100 OUTPUT 718 _IFSTOP 600MHZ 110 OUTPUT 718 _RFSTART 650MHZ 120 OUTPUT 718 _RFSTOP 850MHZ 130 END Programming _FCONV Turn on noise figure mea surementspersonality mode Set all measurement con figuration parameters to default values Establish the memory card i o path to recall ENR data from a card Recall from a memory card the ENR data stored as tN FENR register 33 Move the ENR data to TRC Turn the frequency con version mode ON Redraw display annota tion for frequency conver sion mode measurement state Set the frequency conver sion measurement IF start frequency to 400 MHz Set the frequency conver sion measurement IF stop frequency to 600 MHz The span is 200 MHz and
91. mplete the following command line New ENR Table A aomp fi tude Tr OA XENRS Figure 6 10 _ENR Syntax Creating a New _ENR Table Number any real or integer number NOTE The noise source serial number can be stored in _ENR 401 60 OUTPUT 718 MOV _ENR 401 2493 Stores serial number 2493 6 18 Example Program 10 OUTPUT 718 IP 20 OUTPUT 718 XCH AMPCOR _ENR 30 OUTPUT 718 AMPCOR 100MHz 15 5dB 1GHz 16 6dB 2GHz 15 8dB 40 OUTPUT 718 XCH _ENR AMPCOR 50 OUTPUT 718 AMPCOR OFF 60 OUTPUT 718 MOV _ENR 401 2493 70 OUTPUT 718 _NFMODE Programming ENR Presets spectrum analyzer Stores previous contents of AMPCOR in ENR Storesfrequency amplitude pairs in spectrum ana lyzer Notice that frequen cies are in ascending order Moves ENR table into ENR and replaces the previous AMPCOR contents Turns off the amplitude correction Stores serial number 2493 Enters NF mode 6 19 Programming _FCONV Use the FCONV command to select either frequency conversion mode or non conversion mode XFCONV Figure 6 1 1 _FCONV Syntax Description Default Value 0 non conversion Default Units none Range 0 or 1 Prerequisite Command _NFMODE Related Commands LABEL _FSTART FSTOP _RFSTART _RFSTOP _IFSTART _IFSTOP Description Use the FCONV command to select either frequency conversion or non frequency conversion mode When frequency conversion
92. must equal the RF start and stop frequenc y span Set the conversion mode start frequency to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results in a span equal to the IF frequency span of 200 MHz 6 21 Programming _FCONV Query Response The response displays the frequency conversion mode o Figure 6 12 _FCONV Query Response Syntax QF CONV Programming FSTART _FSTART Use the FSTART command to enter the start frequency for non conversion mode measurements VI stort frequency FSTART xfstar Figure 6 13 _FSTART Syntax Description Default Value 10 0 MHz Default Units HZ Range Spectrum analyzer frequency range Prerequisite Command _NFMODE Related Commands _FCONV _FSTOP Description Use the FSTART command for non frequency conversion measurements Enter or query the start frequency The start frequency is typically the lowest frequency of the device under test Programming _FSTART Example 20 OUTPUT 718 _NFMODE Program 30 OUTPUT 718 _DEFAULTS 40 OUTPUT 718 _FSTART 300MHZ 50 OUTPUT 718 _FSTOP 1200MHZ 60 END Turn on noisejigure mea surements personality mode Set all measurement con figuration parameters to default values Set the non conversion mode start frequency to 300 MHz Set the non conversion mode stop frequency to 1200 MHz Query Response The response displays the start frequency value in Hz output A
93. n version mode ON Redraw display annota tion for frequency conver sion mode measurement state Set the frequency conver sion measurement IF start frequency to 400 MHz Set the frequency conver sion measurement IF stop Srequenc y to 600 MHz The span is 200 MHz and must equal the RF start and stop frequency span Set the non conversion mode start frequency to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results ina span equal to the IF frequency span of 200 MHz Query Response The response displays the current IF start frequency value output Figure 6 22 _IFSTART Query Response Syntax _IFSTOP Programming _IFSTOP Use the _IFSTOP command to enter the IF stop frequency for a frequency conversion noise figure and gain measurement Si stop frequency FSTOP xifsto Figure 6 23 _IFSTOP Syntax a Default Value 950 MHz Default Units Hz Range Spectrum analyzer frequency range Prerequisite Command _NFMODE Related Commands FCONV _RFSTART _IFSTART _RFSTOP Description Use the _IFSTOP command to set or query the IF stop frequency value The IF start and stop frequency span must match the RF stop and start frequency span The frequency conversion device under test determines the ranges of values Frequency conversion needs to be selected for these values to be active Programming _IFSTOP Example 20 Program 25 30 35 40 50 6
94. nd to set the reference level for the gain measurement results ETE EA C Figure 6 19 _GSCALE Syntax Description Default Value 10 0 dB Default Units dB Range 0 10 dBto 99 90dB Prerequisite Command _NFMODE Related Commands GLVL NFLVL _NFSCALE Description Use the GSCALE command to set or query the display scale for the gain measurement Changing the scale does not effect system calibration therefore it can be adjusted during the measurement Example Program 20 OUTPUT 718 _NFMODE Turn on noise figure mea surements personality mode 30 OUTPUT 718 DEFAULTS Set all measurement con figuration parameters to default values 40 OUTPUT 718 _PTS 3 Set the number of mea surement points to 3 50 OUTPUT 718 _FSTART 300MHZ Set the non conversion mode start frequency to 300 MHz 60 OUTPUT 718 _FSTOP 1200MHZ Set the non conversion mode stop frequency to 1200 MHz 6 29 Programming GSCALE 70 OUTPUT 718 _CAL 80 OUTPUT 718 DONE 90 ENTER 718 DONE 100 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 105 PAUSE 110 OUTPUT 718 _MEASURE 120 OUTPUT 718 _GLVL 10DB _GSCALE 5DB 130 END Query Response The response displays the current scale value output Calibrate the measurement setup Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to
95. ndwidth Conversion IF Start Frequency Conversion IF Stop Frequency Conversion RF Start Frequency Conversion RF Stop Frequency ENR Table Data imated DUT Gain imated DUT NF ed Test System NF ed Noise Source ENR inimum Limit ints set to 7 aximum Limit points set to 7 Reference level Scale ut Loss ise Figure Minimum Limi r points set to ise Figure Maximum Limit r points set to ii ise Figure Scale ise Figure Reference Level ise Source Serial Number put toss ints Preamplifier Gain Start Frequency non conversion Stop Frequency non conversion Source Case Temperature Source Loss Time BW Product 100 0 msec to 999 0 sec 10 kHz to maximum spectrum analyzer resolution bandwidth Frequency range of spectrum analyzer Frequency range of spectrum analyzer 0 0 Hz to 999 0 GHz 0 0 Hz to 999 0 GHz 1 to 79 data points the 80 data point is reserved for program use 99 90 dBto 99 90 dB 0 00 dBto 99 90 dB 0 00 dBto 99 90 dB 119 0 dBto 100 0 dB 99 90 dBto 99 90 dB 99 90 dBto 99 90dB 99 90 dBto 99 90dB 0 10 dBto 99 90 dB 99 90 dBto 99 90dB 0 00 dBto 99 90 dB 0 00 dBto 99 90 dB 0 10 dBto 99 90 dB 99 90 dBto 99 90 dB 0 to 9999 99 90 dBto 99 90 dB lto 401 0 0 dBto 99 90 dB Frequency range of spectrum analyzer Frequency range of spectrum analyzer 273 0 Ct o 999 0 C 99 90 dBto 99 90 dB 1to 16 000 kHz s or 1to 999 x BW lin k
96. nterest Use the LOAD FILE key to recall the register contents Select this key from the front panel key menu when CARD is underlined in INTRNL CARD Pressing the CARD ENR key catalogs the registers Use the arrow keys or the RPG to highlight the ENR data of interest Use the Select this key from the front panel key menu when CARD is underlined in INTRNL CARD Pressing the CARD gt STATE key catalogs the arrow keys or the RPG to highlight the instrument state of interest Use the LOAD FILE key to recall front panel configuration menu Use the configuration menu to set the measurement parameters With the scale RF START and RF STOP frequency changing configuration settings after calibration is completed made before resuming measurements Default configuration settings are listed in Table 3 1 of this Select this key in the frequency menu to choose the is off or NO Set frequency conversion to YES for testing receivers mixers or other frequency includes IF start and stop frequency parameters The frequency span of the RF and IF values must Table 3 this section 3 7 Menu Key Descriptions Menu Key Descriptions DEFAULT CONFIG Select this key in the main menu to restore default configuration parameters These parameters are listed in Table 3 1 on the following page 3 8 Menu Key Descriptions Menu Key Descriptions Table 3 1 Noise Figure and Gain Default Parameters Parameter Average Time Ba
97. nts to measure refer to the following steps 1 Press Config in the main menu 2 Press POINTS in the configuration menu 3 Enter the number of points from 1 to 401 you want to measure 4 Press the front panel ENTER key to complete data entry If you choose to enter one point an additional key is displayed The key label is Test Limits Use the test limits feature to enter pass fail criteria The minimum and maximum values for test limits key are described more thoroughly in Chapter 3 Menu Key Descriptions The frequency point is centered between the RF start and stop values you entered Refer to Figure 2 1 for an example of a single point measurement NOISE SOURCE 2493 Ref Lvl amp Scale ACTUAL TEST LIMITS SWEEP NF 6 8 dB NF MAX 7 8 dB SAIN 19 7 dB NF MIN 0 0 dB Soar er GAIN MAX 22 8 dB RPG GAIN MIN 18 0 dB Title Markers NF PASSED GAIN PASSED P A S S FREQUENCY 100 999 MHz ENR 13 88 dB Main Menu Bandwidth 1 000 MHz Avg Time 5 sec pt R Figure 2 1 Single Point Measurement Results 2 9 Making Measurements Configuring for Measurements Table 2 3 Points Entered vs Points Measured lumber Entered ctual Number of Points Measured 1 point 2 points 3 points 4 to 5 5 points 6 to 7 6 points 8 to 9 9 paints 10 to 13 11 points 14 to 16 17 points 19 to 23 21 points 24 to 34 26 points 34 to 45 41 points 46 to 65 51 points 66 to 90 81 points 91 to 150 101 points 151 to 300 20
98. oftkeys should appear on the display e Press 28V ON OFF and select ON Measure the Noise Level at 1 MHz RBW Connect the equipment as shown in Figure 4 2 Notice that the 20 dB attenuator is connected temporarily between the power splitter and the power sensor The power sensor is later connected directly to the power splitter 4 9 Specifications Characteristics and Verification System Performance Verification PREAMPLIFIER PREAMPLIFIER NOISE SOURCE BANDPASS FILTER Y3LdVOV POWER SPLITTER SPECTRUM ANALYZER ADAPTER ATTENUATOR POWER SENSOR pa7ila Figure 4 2 Noise Figure and Gain Accuracy Test Setup Check the power level output of the noise source in the test setup 1 Set both attenuators to O dB attenuation Check that the power level reading on the power meter is 26 dBm 10 dB This power level ensures that the power output from the last amplifier is 0 dBm 10 dB 2 Adjust the step attenuators for a 25 dBm 1 dB reading on the power meter Record the attenuator settings in Columns 1 and 2 of Figure 4 3 4 10 Specifications Characteristics and Verification System Performance Verification 3 Press SETUP Wait for the completion of the setup routine Enter 1 MHz when prompted for the bandwidth Check the system noise level 4 Set the HP 8495A attenuator to 120 dB press SYSNOISE then read the system noise level NOTE The SYSNO
99. ollowing commands be sure to send the NFMODE command to initiate the noise figure measurements mode Table 6 2 Commands in Alphabetical Order Command Corresponding Key Description _AVGTIME AVG TIME AUTO MAN Enter or query the measurement averaging time value The value affec he measurement time per measurement point The range is from 100 0 ms to 999 0 s BANDWIDTH Enter or query the measurement bandwidth CAL nitiate system calibration _CONN none Controls external equipment via the auxiliary interface connector during oise figure mode or noise figure calibration ENR CARD ENR Enter or recall ENR data INTERNAL ENR DEFAULTS DEFAULT CONFIG Set all measurement parameters to default values _FCONV Conversion YES NO Select or query the frequency conversion mode A query response of 1 indicates frequency conversion is selected 0 indicates non conversion is selected FSTART START FREQ Enter or query the measurement start frequency value All frequency values are converted to Hz FSTOP STOP FREQ Enter or query the measurement start frequency value All frequency values are converted to Hz GLVL GAIN REF LVL Enter or query the reference level for the gain trace GSCALE GAIN SCALE Enter or query the measurement scale for the gain trace in dB div 6 6 Programming Reference Tables Table 6 2 Commands in Alphabetical Order continued FSTART IF ST
100. on provides the measurement setup specifications and characteristics along with the verification tests The performance test record is provided at the end of this chapter e Chapter 5 If you Have a Problem includes descriptions of measurement error messages Return to factory information is also included in this chapter e Chapter 6 Programming is the remote command reference Commands and their descriptions are alphabetically listed in this chapter A cross reference table of the personality s menu keys and their related commands is located in this chapter Xi Contents 1 Getting Started Users Guide Key Conventions Installing the Measurement Personality To dispose previously installed DLPs To load the noise figure and gain measurement DLP Using the Self Test Feature Using the self test function If the self test finds trouble If the trouble persists Sales and service offices listing 2 Making M easurements Improving Noise Figure Measurement Accuracy Configuring for Measurements To enter measurement frequencies To measure above 2 9 GHz To measure below 10 MHz To measure non frequency converting devices To measure frequency converting devices To enter the number of measurements Zone To enter time BW parameters Determine the time bandwidth product To enter external losses To enter external losses To enter preamplifier gain To enter noise source case Temperature To ed
101. on During Device Measurement 2 19 2 9 OUTPUT LOSS Location During Calibration 2 20 2 10 OUTPUT LOSS Location During Device Measurement 2 21 2 11 The ENR Data Table Editor Screen 2 2 2 25 2 12 Basic Calibration Setup 2 2 020 2 31 2 13 Calibration Completion Display 2 2 32 2 14 Measuring Amplifier Noise Figure and Gain 2 36 2 15 Amplifier Measurement Results Example 2 37 2 16 Measuring a 750 Frequency Converting Device 2 40 2 17 TV Tuner Measurement Results Example 2 42 3 1 The Measurement Personality Main Menu 3 2 3 2 The NF amp Gain Personality Menu Map 3 4 4 1 CAL FREQ and CAL AMPTD Setup 4 8 4 2 Noise Figure and Gain Accuracy Test Setup 4 10 4 3 Noise Level Worksheet RBW 1 MHz led tn ae ea Oe 4 14 4 4 Noise Level Worksheet RBW 3 kHz 2 2 4 18 6 1 Syntax Structure Description 6 8 6 2 AVGTIME Syntax 2 2 ee 6 10 6 3 AVGTIME Query Response Syntax 6 11 6 4 BW Syntax it ao A a Bop E eee 6 12 6 5 BW Query Response Syntax 6 13 6 6 CAL Syntax 2 2 6 14 627 CONN Syntax a Gc Sa sh age ee ee en a ea 6 15 6 8 ENR Syntax Recalling Existing Table from Internal Memory 6 16 6 9 ENR Syntax Recalling Existing Table from Memory Card 6 17 6 10 ENR Syntax Creating a New ENR Table 6 18 6 11 FCONV
102. onnectors Use only cables that are in good condition Make measurements away from potentially interfering signals Increase device gain if possible Higher device gain minimizes many errors related to the measurement system Reduce the measurement system noise Reduce the effects of measurement system noise by using a low noise system preamplifier whenever possible Reduce known error sources such as SWR and ENR uncertainty Use a narrower measurement bandwidth than the bandwidth of the device under test Refer also to product note 85719A 1 for additional information 2 4 Configuring for Measurements The Conf ig menu provides the parameters whose values and states need to be determined if they are to be changed from default values before you begin making measurements Table 2 2 lists the configuration menu keys and some brief descriptions of the parameters Refer to Chapter 3 Menu Key Descriptions for more thorough information 2 5 Making Measurements Configuring for Measurements Table 2 2 Configuration Selections Menu Key Selections se Parameter Range Freq Menu Start and stop Sat measurement frequenc Frequency range of the spectrum frequencies range analyzer in non conversion mode or with frequency In conversion mode the RF start conversion and RF stop frequency ranges are RF and IF start and 0 00 Hz to 999 9 GHz stop frequencies POINTS Points to measure Set the number of equall
103. pgrades which may be available for HP under a separate support agreement Export e Customer agrees not to export or re export the software or any copy or adaptation in violation of the U S Export Administration regulations or other applicable regulations Limited Warranty Software Hewlett Packard warrants for a period of 1 year from the date of purchase that the software product will execute its programming instructions when properly installed on the spectrum analyzer instrument indicated on this package Hewlett Packard does not warrant that the operation of the software will be uninterrupted or error free In the event that this software product fails to execute its programming instructions during the warranty period customer s remedy shall be to return the measurement card media to Hewlett Packard for replacement Should Hewlett Packard be unable to replace the media within a reasonable amount of time Customer s alternate remedy shall be a refund of the purchase price upon return of the product and all copies M edia Hewlett Packard warrants the media upon which this product is recorded to be free from defects in materials and workmanship under normal use for a period of 1 year from the date of purchase In the event any media prove to be defective during the warranty period Customer s remedy shall be to return the media to Hewlett Packard for replacement Should Hewlett Packard be unable to replace the me
104. query the time bandwidth product in kHz seconds TBWAUTO AVG TIME AUTO MAN Select or query the time bandwidth mode 1 indicates auto mode 0 indicates manual mode TEMPC SOURCE TEMP Enter or query the noise source case temperature in C 6 7 Programming Reference Tables Command Syntax Description Command syntax is represented pictorially as shown in Figure 6 1 below COMMAND SOLID LINE PATH ARGUMENT TERMINATOR Enter os shown preferred Enter asshown Enter os shown SEPARATOR RECTANGULAR Enter asshown ELEMENT See Table 2 2 DOTTED LINE PATH pa75a not recommanded Figure 6 1 Syntax Structure Description Descriptions of the syntax diagram symbols or elements are described below e Ovals enclose command mnemonics The command mnemonic must be entered exactly as shown in diagrams e Circles and ovals surround secondary keywords or special numbers and characters The characters in circles and ovals are considered reserved words and must be entered exactly as shown in diagrams e Rectangles surround the description of a syntax element The element may be parameters or variables related to the command The range of choices is listed in a table accompanying each command Syntax diagram elements are connected either with solid or dotted lines Solid line paths represent recommended command paths Combinations of elements generated by following the lines in the proper direction crea
105. r 1 QF STAR Figure 6 14 _FSTART Query Response Syntax 6 24 Programming _FSTOP _FSTOP Use the FSTOP command to enter the stop frequency for non conversion mode measurements Sn stop frequency N xfstop Default Value Default Units Range Spectrum analyzer frequency range Prerequisite Command _NFMODE Related Commands FSTART _FCONV Example 20 OUTPUT 718 _NFMODE Turn on noise figure mea Program surements person amp it y mode 30 OUTPUT 718 DEFAULTS Set all measurement con figuration parameters to default values 40 OUTPUT 718 _FSTART 300MHZ Set the non conversion mode start frequency to 300 MHz 50 OUTPUT 718 _FSTOP 1200MHZ Set the non conversion mode stop frequency to 1200 MHz Programming _FSTOP 60 END Description Use the _ FSTOP command for non frequency conversion measurements Enter or query the stop frequency The stop frequency is typically the highest frequency of the device under test Query Response The response displays the stop frequency value in Hz output gt Figure 6 16 _FSTOP Query Response Syntax QF STOP GLVL results Programming GLVL Use the GLVL command to set the reference level for the gain measurement GLVL Ep EE Q Figure 6 17 _GLVL Syntax Default Value Default Units Prerequisite Command _NFMODE Relates Commands xgain Range 99 90 dBto 99 90 dB GSCALE NFLVL _NFSCALE Description Use
106. r test limit values e Return to the configuration menu by pressing Main Menu 2 38 Calibrate the measurement setup To measure a frequency converting device Making Measurements Measuring a Frequency Converter 4 Press More 1 of 2 to enter additional measurement parameters If you calibrate the measurement setup connect the equipment as illustrated in Figure 2 12 Enter DUT input and or output losses as previously explained in To enter external losses At the end of the measurement a message appears to indicate calibration completion 1 Connect the noise source to the input of the preamplifier with all the connectors cables and necessary hardware included 2 From the main menu press CAL When calibration is complete connect the device to begin measurements To measure the noise figure and gain of a frequency converter such as a TV tuner connect the device as illustrated in Figure 2 16 then press Measure Refer to Figure 2 17 for an example of the measurement results screen If you do not calibrate press Measure two times to begin the measurement NOTE Uncalibrated noise figure measurements can be made however there will be no gain measurement trace Making Measurements Measuring a Frequency Converter 28 VOLTS SPECTRUM SWITCHED ANALYZER NOISE SOURCE PREAMPLIFIER 750 CONVERTER UNDER TEST 752 752 MATCH I NG MATCHING TRANSFORMER PND TRANSFORMER
107. rd registers If measurements are not preceded with a complete calibration the warning Calibration needed is displayed You can either press Measure again to make un calibrated measurements or press CAL again and complete the calibration 3 14 NOTE Menu Key Descriptions Menu Key Descriptions Gain results are not available during un calibrated measurements More 1 of 2 More 2 of 2 NFREFLEVEL NF SCALE OUTPUT LOSS Select this key in the configuration menu to display more configuration choices The More 4 of 2 key displays the following menu e Time BW Menu External Losses PREAMP GAIN SOURCE TEMP e Edit ENR Data e More 2 of 2 Select this key in the more 1 of 2 configuration menu to return to the previous configuration menu level Select this key in the reference level and scale menu to display or change the noise Egure reference level setting for a measurement The scale range is from 0 10 dB div to 99 90 dB div Select this key reference level and scale menu to display or change the noise Egure scale setting for a measurement The scale range is from 0 10 dB div to 99 90 dB div Select this key in the external losses menu to enter loss compensation factors that exist due to devices connected between the output connector of the device under test and the system preamplifier and present during the measurement These devices include cables and isolators that are attached during the measurement
108. refer to the steps below 1 Connect the test equipment as illustrated in Figure 2 12 Be sure to include your specific connectors cables and adapters required for making your measurement 2 Press a calibration key Use either the measurement personality CAL key or the front panel key to start the calibration routine 3 Refer to Figure 2 13 for an example of the message displayed when calibration is completed 4 Connect the device to test and begin making measurements Some examples are included in this chapter NOTE Changing the reference level scale input loss output loss RFstart and RFstop for frequency converter measurements after calibration does not require measurement recalibration 2 31 Making Measurements Calibrating for Measurements NOISE SOURCE B Calibration completion display CAL NF DO es be nena de la ante nace E o NE ak dB MEASURE Gain E EASE EASES REE Re ee ee n A eer 44 10 0 Calibration tad dB Read Weasure DUT l Contig 9 0 ILdB DEFAULT 0 0 CONFIG OLdB 8 8 Dee ict O NN SELF 21 0 TEST PL ae NF RL 0 0 da Gain RL 0 0 da STOP DISPOSE 10 000 MHz 1800 000 MHz NF amp GAIN Bandwidth 1 000 MHz 3 Pts Avg Time 0 5 sec pt R Figure 2 13 Calibration Completion Display 2 32 Making Hard Copies Connect the spectrum analyzer to an HP IB printer and use the front panel COPY key to generate prints A printer is the suggested output device A plotter may
109. ressing the STATE CARD key saves the instrument state on the memory card Select this key from the front panel key menu when INTRNL is underlined in INTRNL CARD Pressing the STATE gt INTRNL key saves the instrument state in the internal memory register that you select Select this key to enter the stop frequency setting of a non frequency conversion measurement The range of frequencies is from 100 kHz to the upper frequency limit of the spectrum analyzer Select this key which only appears when the number of points 1 in the configuration menu to set minimum and maximum limits for a measurement The test limit keys are described in this section The key are listed below e GAIN MAX LIMIT GAIN MIN LIMIT NF MAX LIMIT NF MIN LIMIT Measurements that are made while limits are set provide results specific to the single frequency point selected The display indicates whether both the noise figure and gain results pass or fail Select this key in the frequency menu to enter time and bandwidth values Select a measurement bandwidth with the BANDWDTH key that is appropriate for the measurement The product of the time value multiplied by the measurement bandwidth can be controlled to effect jitter measurement repeatability Menu Key Descriptions Menu Key Descriptions TIME BW PRODUCT TR amp ST CARD If measurement to measurement repeatability is important use a longer average time with the AVG TIME ke
110. rogramming AVGTIME Select the noise figure and gain measurements mode Set all measurement con figuration parameters to default values Set the time measurement bandwidth value to 300 and change the measure ment bandwidth to 1 MHz Set the averaging time to 1 second per measurement point Calibrate the measurement setup for the new parameters Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Make a calibrated noise figure and gain measurement output gt Figure 6 3 _AVGTIME Query Response Syntax 6 11 Programming _BW The BW command selects or queries the measurement resolution bandwidth measurement bandwidth number Default Value Default Units Range 1 0 kHz to Maximum spectrum analyzer resolution bandwidtt Prerequisite Command _NFMODE Related Commands TBWAUTO T B W Description The value of the BW sets the measurement bandwidth Changing the measurement resolution bandwidth when AVGTIME AUTO is selected changes the averaging time The new sweep time is the time bandwidth product divided by the measurement bandwidth 6 12 Example Program 10 OUTPUT 718 _NFMODE 15 OUTPUT 718 _DEFAULTS 20 OUTPUT 718 _TBW 300 _BW 1MHZ 30 OUTPUT 718 _AVGTIME 1 40 OUTPUT 718 _CAL 50 OUTPUT 718 DONE 60 ENTER 718 DONE 70 DISP CALIBRATION DONE PRES
111. rors are measured and incorporated into the final calculations 4 6 Related Spectrum Analyzer Adjustments Specifications Characteristics and Verification System Performance Verification Log Scale Fidelity Cal Attenuator Equipment required for the The performance verification test equipment is listed below measurement HP 859XE Series Spectrum Analyzer HP 8591E 93E 94E 95E 96E HP 85719A noise card 2 0 0 0 ccc cece cece eee eee Option 119 Power Meter must have averaging HP 437A or HP 438B Preamplifier two required HP 8447A Option 011 Low Power Sensor 0 00 cee eee eee enean HP 8481D 321 4 MHz Bandpass Filter erica 9135 0252 Power Splitter 2 0 0 ccc cence een eee HP 11967A Coaxial 1 dB Step Attenuator HP 8494A Option 001 Coaxial 10 dB Step Attenuator HP 8595A Option 001 Fixed 20 dB Attenuator HP 8591A Option 020 Type N Interconnect Kit 0 0 0 0 0 c cece eee ee HP 11716A Cables 500 BNC Cable 8120 2682 Type N Cable 61 cm 24 inches five required HP 11500B Adapters SMA m to Type N f qiiia aA 1250 1562 Type N m to SMA m eee 1250 1250 Type N m to Type N m 0 0 0 e eee eee 1250 0778 Type N m to BNC 00 1250 0780 Calibrate the System Connect the equipment as shown in Figure 4 1 Allow each piece of equipment to warm up according to its manufacturer s documentation 4 7
112. s Lava Time 0 5 Measurement Points Averaging Bandwidth to Time Measure Noise Gain Figure Measurement Measurement Reference Reference Level Level Figure 3 1 The Measurement Personality Main Menu 3 2 Menu Map The menu map of the HP 85719A Noise Figure Measurements Personality illustrates menu flow with both solid and dotted lines e The dotted lines represent paths to menus or keys that appear when parameter conditions require them As an example the Test Limit key is available only when the number of points equals 1 If frequency conversion is set to YES additional keys are displayed to accommodate the frequencies needed for making converter measurements e The solid lines represent the default configuration menu paths 3 3 Menu Key Descriptions Menu Map NF amp GAIN main menu CAL ABORT CAL Conversn YES NQ START FREQ Measure Config Freq Menu STOP FREQ DEFAULT CONFIG a POINTS 1 SELF TEST Freq Menu Test Limits PAE DISPOSE NF amp GAIN POINTS Ref Lv amp Scale ai Mein Menu A aa ie Ref Lvl amp Scale More 1 of 2 ABORT Main Menu Conversn YES NO More 1 of 2 l RF START FREQ RF STOP FREQ 1 IF START FREQ 1 iF STOP FREQ Ref Lvl amp Scale NF REF LEVEL i Previous Menu SWEEP CONT SGL NF SCALE RPG Title GAIN REF LEVEL Markers __ _ GAIN SCALE Main Menu Resume Measure Previous Menu NF MAX LIMIT NF
113. span of 200 MHz Enter the case tempera ture of the wise source as 19 C Calibrate the system for measurements Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Make a calibrated noise figure and gain measurement Query Response The response displays the current temperature selected output Figure 6 54 _TEMPC Query Response Syntax 6 73 Index Index A amplitude editing in ENR table 3 17 average time control 3 5 B bandwidth setting 3 5 C calibrating 3 5 calibration escape 3 5 card memory saving states 3 19 caution the caution symbol viii completing ENR data editing 3 10 configuration default setting 3 8 configuring for measurements 3 7 D deleting ENR data 3 10 delta markers 3 13 displays in card memory 3 6 E editing ENR data 3 10 editing point in ENR data table 3 17 ENR data to card 3 7 entering DUT gain 3 11 entering DUT noise figure 3 11 entering ENR estimation 3 11 entering external losses 3 11 entering gain reference level 3 12 entering gain scale 3 12 entering IF start frequency 3 12 entering IF stop frequency 3 12 entering input losses 3 13 entering noise figure reference level 3 15 entering noise figure scale 3 15 entering noise source serial number 3 18 entering non conversion start and stop frequencies 3 18 entering preamplifier gain 3 16 entering RF start and stop freq
114. surements does not require a re calibration Select this key in the markers menu to continue a measurement after you have used the marker keys or used the RPG title mode Select this key in the frequency menu when conversion is set to YES Display or change the RF start frequency value for a measurement The range of RF frequencies is from 0 0 kHz to 999 GHz Select this key in the frequency menu when conversion is set to YES Display or change the RF stop frequency value for a measurement The range of RF frequencies is from 0 0 kHz to 999 GHz Select this key in the measurements menu to display the alpha numeric title window Press the front panel key after you have entered the title then press Resume Measure to return to the measurement menu Select this front panel key to save a measurement state a measurement result a display or an ENR table in memory Either a memory card if one is installed or the spectrum analyzer memory registers may be used for ENR and state data Select this key in the edit ENR data menu to modify an amplitude value Select this key in the edit ENR data menu to modify a frequency value Select this key in the edit ENR data menu to choose a data point in the table displayed 3 17 Menu Key Descriptions Menu Key Descriptions SELF TEST SERIAL NUMBER SWEEP SNGL CONT SOURCE LOSS SOURCE TEMP Select this key to start the DLP self test procedure The function checks that the nois
115. ter 3 kHz when prompted for the bandwidth Check the system noise level 4 Set the HP 8495A attenuator to 120 dB press SYSNOISE then read the system noise level NOTE The SYSNOISE readout should be lt 57 dB RL to achieve optimum results 5 Return the HP 8495A attenuator to the values determined in step 2 Measure the change in noise level between attenuator settings 6 Press MEASURE then record the value displayed on the spectrum analyzer screen in Figure 4 3 column 3 as the Noise Level Readout in dB RL 7 On the power meter press REL The power meter readout should be 0 dB You may need to press two times to ensure a O dB readout Specifications Characteristics and Verification System Performance Verification NOTE If the reading on the power meter is unstable you may need to use power meter averaging Press MNL FILTER and enter a value such as 5 to enable power meter averaging 8 Increment the step attenuators 3 dB and record the attenuator settings in Figure 4 3 columns 1 and 2 9 Record the absolute value of the power meter reading to 2 decimal places as the Power Meter Readout in Figure 4 3 Column 5 10 Repeat steps 6 through 9 until the total attenuator setting equals 30 dB 11 Remove the 20 dB fixed attenuator from the power sensor and connect the power sensor directly to the power splitter 12 Press to establish a new power meter reference then continue making measurem
116. tes syntactically correct commands 6 8 Command Reference This section contains the alphabetical reference of the commands listed in Table 6 2 Each command description includes a syntax diagram parameters as appropriate and sample programs using the HP BASIC command language 6 9 Programming _AVGTIME Use the _ AVGTIME command to enter an averaging time value averaging time Sao per point N AVGT IME xavgti Figure 6 2 _AVGTIME Syntax Default Value 0 5 seconds Default Units s seconds Range 0 1 secto 999 0 sec Prerequisite Command _NFMODE Related Commands _TBWAUTO _TBW Description When AVGTIME is set to automatic mode the averaging time for measurements is automatically determined The speed of the measurement affects the jitter or repeatability of the measurement In automatic mode the time bandwidth product is divided by the measurement bandwidth to determine the averaging time per point In manual mode just the measurement time is changed the time bandwidth value is not recalculated 6 10 Example Program 10 OUTPUT 718 _NFMODE 15 OUTPUT 718 _DEFAULTS 20 OUTPUT 718 _TBW 300 _BW 1MHZ 30 OUTPUT 718 _AVGTIME 1 40 OUTPUT 718 _CAL 50 OUTPUT 718 DONE 60 ENTER 718 DONE 70 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 75 PAUSE 80 OUTPUT 718 _MEASURE 90 END Query Response The response is displayed in seconds P
117. the GLVL command to set or query the gain measurement reference level Changing the reference level does not affect system calibration therefore it can be adjusted after calibration Example Program 10 OUTPUT 718 _NFMODE 20 OUTPUT 718 DEFAULTS 30 OUTPUT 718 _PTS 3 40 OUTPUT 718 _FSTART 300MHZ 50 OUTPUT 718 _FSTOP 1200MHZ Turn on noise figure mea surements personality mode Set all measurement con figuration parameters to default values Set the number of mea surement points to 3 Set the non conversion mode start frequency to 300 MHz Set the non conversion mode stop frequency to 1200 MHz 6 27 Programming GLVL 60 OUTPUT 718 _CAL 70 OUTPUT 718 DONE 80 ENTER 718 DONE 90 DISP CALIBRATION DONE PRESS CONTINUE WHEN READY TO MEASURE 100 PAUSE 110 OUTPUT 718 _MEASURE 120 OUTPUT 718 _GLVL 10DB _GSCALE 5DB 130 END Calibrate the measurement setup Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed Make a calibrated noise figure and gain measurement Set the gain trace refer ence level to 10 dB Set the scale for the gain trace to 5 dB Query Response The response displays the current gain reference level value output gt Figure 6 18 _GLVL Query Response Syntax 6 28 Programming _GSCALE _GSCALE Use the GSCALE comma
118. tup include all the hardware and cabling setup required for your measurement unless you have entered DUT input and or output losses At the end of the measurement a message appears to indicate calibration completion 1 Connect the noise source to the input of the preamplifier with all the connectors cables and necessary hardware included 2 From the main menu press CAL When calibration is completed connect the device and begin measuring 2 35 Making Measurements Measuring an Amplifier To measure the amplifier To measure the noise figure and gain of an amplifier connect the equipment as indicated in Figure 2 14 then press Measure If you do not calibrate press Measure two times to begin measurements Refer to Figure 2 15 for an example of the measurement results NOTE Uncalibrated noise figure measurements can be made however there will be no gain measurement trace SPECTRUM ANALYZER 28 VOLTS SWITCHED AMPLIFIER Figure 2 14 Measuring Amplifier Noise Figure and Gain pa74a During the measurement a new menu is presented From the measurement menu you can activate markers enter a title for the measurement change the reference level and scale or change the sweep mode 2 36 Making Measurements Measuring an Amplifier NOISE SOURCE 12493 MPSS TH a Gain 9 25 dB Marker 376 359 MHz NF 5 45 dB MARKER MARKER DELTA Main Menu Resume Measure START Gain RL 0 09 dB STO
119. uencies 3 17 entering test limits 3 19 entering test system noise figure 3 11 entering time and measurement resolution bandwidth values 3 19 erasing the personality 3 10 Index 2 error messages 5 3 external loss data entry 3 11 F features x frequency conversion control 3 7 frequency editing in ENR table 3 17 frequency marker 3 14 G gain DUT 3 11 gain reference level 3 12 gain reference level and scale 3 17 gain scale 3 12 general safety considerations ix H HP 8590 series operation vs 859XE series operation 1 2 IF start and stop frequency 3 12 input losses 3 13 instrument display to card 3 6 instrument function differences 1 2 instrument state to card 3 7 internal memory recalling ENR data 3 13 internal memory recalling states 3 13 internal memory saving ENR data 3 11 internal memory saving states 3 19 L losses at the noise source 3 18 M main menu keys 3 14 marker delta 3 13 marker frequency 3 14 marker functions 3 13 marker normal 3 14 markers off 3 14 maximum gain limits 3 12 measurement bandwidth 3 5 measurement configuration 3 7 measurement features x measurement personality messages 5 3 measuring menu 3 14 memory card ENR data 3 7 memory card saving display states 3 10 memory cards saving ENR data 3 10 menu map 3 3 minimum gain limits 3 12 Index 3 N noise figure DUT 3 11 noise figure reference level 3 15 noise figure reference level and scale
120. uency to 600 MHz The span is 200 MHz and must equal the RF start and stop frequency span Set the non conversion mode start frequency to 650 MHz Set the non conversion mode stop frequency to 850 MHz which results in a span equal to the IF frequency span of 200 MHz Calibrate the measurement system Query the spectrum ana lyzer for the calibration routine status Get the status condition Display the calibration done message Wait for the key to be pressed 6 41 Programming MEASURE 130 OUTPUT 718 _MEASURE 140 INTEGER I 150 REAL G_data 1 401 160 FOR I 1 TO 401 170 OUTPUT 718 _GAIN 1 180 ENTER 718 G_data I 190 G_data I G_data I 100 200 NEXT I 210 REAL N_figure 1 401 220 FOR I 1 TO 401 230 OUTPUT 718 _NF 1 7 240 ENTER 718 N_figure I 250 N_figure I N_figure I 100 260 NEXT I 270 END 6 42 Make a calibrated noise figure and gain measurement The array to hold gain measurement trace data Query the gain trace for data Enter the data Convert the data to dB units The array to hold noise figure measurement trace data Query the noisejigure trace for data Enter the data Convert the data to dB units Programming NFLVL _NFLVL Use the NFLVL command to set the reference level for the noise figure measurement results NFLVL Aa C23 Figure 6 30 _NFLVL Syntax xnfivl Description Default Value Default Units Range 99 90 dBto 9
121. ving an output frequency above 2 9 GHz but an overall frequency span within that of the spectrum analyzer you need to supply a system preamplifier that extends to the output frequency of the device tested Also the specifications in Table 4 1 may not apply when other than an HP 87405A preamplifier is used To measure below 10 MHz To measure a device having a frequency range below the 10 MHz specification To measure non frequency converting devices of the HP 85719A measurement personality you need to provide a low frequency system preamplifier such as the HP 8447 and a low frequency calibrated noise source Also the specifications in Table 4 1 may not apply when other than an HP 87405A preamplifier is used To enter the RF frequency range of the non frequency converting device under test refer to the following steps l Press Conf ig in the main menu 2 Press Freq Menu in the configuration menu 3 Press Conversion YES NO to underline NO the default setting when you are measuring a device other than a frequency converter 4 Press START FREQ and STOP FREQ to enter the start and stop frequencies of the DUT 5 Press Previous Menu to return to the configuration menu 6 Continue configuration or return to the main menu 2 7 To measure frequency converting devices Making Measurements Configuring for Measurements The measurement personality frequency menu supports two modes The Erst mode described below is for
122. y 1 point to 401 points Spaced frequency points over easurement frequency range Test Limits Measurement limit Sat minimum and NF 0 00 dBto 99 90 dB appears if number of settings for minimum maximum power limits for Gain 99 90 to 99 90 dB points 1 and maximum noise noise figure and gain figure and gain pass fail testing Ref Lvl amp Scale Measurement Set the measurement Noise figure reference level reference levels and reference levels and scales range is 99 9to 99 90 dB scales Noise figure scale range is 0 10 dBto 99 90 dB Gain reference level range is 99 9 dBto 99 90 dB Gain scale range is 0 10 dB to 99 90 dB More 1 of 2 key yields these menu keys Time BW Menu Enter additional Specific uses provided Ranges listed in Chapter 3 neasuramant alphabetically in Chapter 3 Menu Kay Descriptions yarameters t 0 Menu Kay Descriptions PREAMP GAIN sustomize External Losses naasuramant SOURCE TEMP equirements Edit ENR Data 2 6 Making Measurements Configuring for Measurements To enter measurement frequencies The frequency range of the noise figure measurement setup with the HP 87405A preamplifier is from 10 MHz to 2 9 GHz unless the HP 85913 spectrum analyzer is used then the maximum frequency is 1 8 GHz You can easily measure a device whose output frequency range falls within this span without additional hardware To measure above 29 GHz To measure a device ha
123. y 3 7 sweeping single or continuous 3 18 system calibration 3 5 T temperature noise source 3 18 terminating ENR data editing 3 10 test limits minimum and maximum 3 19 time BW product 3 20 time BW values 3 19 titling measurements and traces 3 17 U using the frequency menu 3 12 using the help time bandwidth menu 3 12 V verifying specifications 4 5 W warning the warning symbol viii warranty vi Index 5
124. y for measurements You can also accelerate measurement time by increasing the measurement bandwidth when AVG TIME AUTO is selected Select this key in the configuration or the help time BW menus to adjust the time bandwidth product This product is the average time multiplied by the measurement bandwidth in kilohertz seconds Changing the time BW product while averaging time is set to AUTO mode causes the measurement time to change but not the measurement bandwidth Select this key from the front panel SAVE_ key menu when CARD is underlined in INTRNL CARD Pressing the TR amp ST CARD key saves the instrument trace and state on the memory card 3 20 Specifications Characteristics and Verification Specifications Characteristics and Verifi cation This chapter contains Table 4 1 measurement specifications and characteristics as well as procedures to verify the specifications The chapter is organized as follows e The table of specifications and characteristics e The performance verification test 4 2 Specifications and Characteristics All specifications apply over 0 55 C The Noise Figure and Gain measurement personality specifications are valid after 2 hours of storage at a constant temperature within the operating temperature range 30 minutes after the spectrum analyzer is turned on and after CAL FREQ and CAL AMPTD have been run NOTE These specifications apply when an HP 87405A Preamplifier and a

HP 85719A Noise Figure Measurements Personality User's Guide

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