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Service Guide: Keysight (Agilent) FieldFox MW VNA/SA

1. donde EP 3 4 Service Test Pquiptaent aine 14474 60242 OEE PEERS HELE OLDS MEER E box Ev s 3 5 Before Retuming an Instrument to a Customer iiis seen 3 6 OpergDnasual NCR REP PCS SEE eR epar 3 7 Required Eome o 224 5 b EE E b ERE Eb E E ETHER ELE bddbteE be S ihe ds 3 7 lani qe rrr 3 7 Performance Tests Agilent Software Package yv UP REO ERES 3 9 Perfioiiauce Verucalon Wests ons cece ORE EErEE EEE UREE EEEE EED CERE 3 9 Adjustments Agilent NT841A Software Package coosees esee tt o RESET PERSE 3 10 unran PP nme 3 10 4 Troubleshooting in Tis COSE ewe Rea ERREUR RAI EH ERE ERE ERR p ERU 4 2 Protect Against Electrostatic Discharge ESD 6 16 15 ceci cete t ceee P OR ee 4 3 Assembly Replacement Sequence iiis dens abe d a e REX Red RARO REG EERE NEDSS wE 4 3 Started with Troubleshootilig i e ssec secre eee RR eR ape RR Y UR PER per 4 4 Check Ihe cu cca esteri e c e HU iste eed Se Rd LB 4 4 Service Guide N9927 90003 Contents 1 Contents Troubleshooting OfgamzalloB 2142232 e 23 hoe Reed SESS A e Rc Rd RR OME eS 4 5 Power Up Troubleshooflfg i bee REY RR Y ERE tien erred 4 6 F
2. 5 17 5 17 Grounding and 5 18 pP d Pru DEA 5 18 and Pawer RE RE ERSTE Eee E bae 5 18 Power Control Gnd Management 2 eg esas 5 19 Battery Belited IntermsUol s 425 mde geek evento iene ERE EE RP TRA 5 20 Operetta in MEME cure co eue X IR CEPR DERE pU Ep s 5 22 CAT NA aT V MICs tiene REPRE ERE SERRE CERE TE Eb Eh IER EE E EE Edad 5 24 or WH CRM Modes E kha RS EATER ADHERE APR RE E e 5 24 Power Meter MOUSE ois d beo re EAR ERES ERREUR 5 25 Tempere Related Informal 6p CR Rd echo b eb EP ERR EFE 5 25 User Calibration in CAT NA Modes 0 0 0 ccc cece ee eee eens 5 26 Factory Cahbrahon al Rest 5 26 kei 5 26 pedes qp pP Eb ehe CER E 5 27 Fimmware Related InformatioD TE E ERES 5 28 carga die MR MD 5 28 Riser Acces Be EIOS Leu bd ich iden ELEM ERE IER RUE RM ERR EL ER EE ene Seas 5 28 Deen o A PHBE 2o RICE DIE EUR EE RURSUS SERRA ded 5 28 Erase User Data s Lo ERRARE EROR Er
3. IO sidepanel N9927 90003 7 15 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Case Group Parts 5 Refer to Figure 7 10 Remove the three doors from the old I O side panel a Open each door to its stopping point then GENTLY force it beyond its stopping point to separate it from the panel 6 Install the three doors in the new I O side panel a Place each door in its respective opening with the hinges aligned with the hinge slots in the side panel b Press the hinges into their slots until they snap into place Figure 7 10 Replacing the I O Side Panel Doors and Gasket Hinge socket Press here on hinge until the hinge ball snaps into the hinge socket AD Hinge ball Install new gasket in groove here n9912 90003 709 7 Before installing the new I O side panel or when reinstalling the existing I O side panel install a new gasket in the groove around the perimeter of the panel If an old gasket must be removed use tweezers being careful not to damage the groove Start in the groove near the flat end of the side panel Be careful not to stretch or damage the gasket in any way Also make sure there is no slack in the gasket A new gasket is provided in the Repair and Re assembly Kit see page 6 13 It is the smaller of the two gaskets provided in the kit 8 To install the new I O side panel place it in position on the A5 System board and reinstall the two attachmen
4. Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies Inc products For information about these agreements and for other assistance contact Agilent Refer to Contacting Agilent on page 2 9 Safety and Regulatory Information The safety and regulatory information pertaining to this product is located in Chapter 1 Safety and Regulatory Information Safety Notes The following safety notes are used throughout this manual Familiarize yourself with each of the notes and its meaning before operating this instrument All pertinent safety notes for using this product are located in Chapter 1 Safety and Regulatory Information WARNING Warning 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 note until the indicated conditions are fully understood and met CAUTION Caution denotes a hazard It calls attention to a procedure that 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 Documentation Map On line This Service Guide is available only on the Web via an Internet connection It Service contains information for testing adjusting troubleshooting and repairing your Guide FieldFox analyze
5. Includes AS System 5 system board N9927 63002 Board N9927 60112 1 13 Screw 19 places 0515 5511 Assembly 13 Screw 2 places 0515 0430 18 Screw 4 places 0515 1940 RF Top Panel Assembly Includes 1 Connector cover tethered cap for Type N connector qty 2 RF Connector cover for SMA connector W3 amp W4 1401 0245 qty 2 Top Panel N9927 60115 1 2 Screw 0515 2349 6 places Assembly 5 Overlay RF 6 Panel RF machined N9927 20013 7 Gasket RF Separately Replaceable Individual Parts and Assemblies A6 1150 8023 1 SOM Board 532 MHz processor 128 MB SDRAM A7 N9927 60121 1 RTC Battery Board Assembly wil N9927 20028 1 Cable semi rigid Port 1 RF Output 2 N9927 20029 Cable semi rigid Port 2 SA RF Input W3 8121 2029 1 Cable SMA MCX Ref In Trig In incl nut 3 and washer 4 WA 8121 2029 1 Cable SMA MCX GPS Ant incl nut 3 and washer 4 W17 N9927 60010 1 Cable RTC Battery board 1 W1312 40069 2 Connector cover tethered cap for Type N connector 1 9927 40013 2 Connector cover tethered cap for 3 5 mm connector 7 N9912 40004 2 Gasket 8 8160 0963 2 O Ring gasket 9 N9927 60123 4 Type N Adapter assembly 9 N9927 60122 4 3 5 mm Adapter assembly Screw machine w crest cup washer pan head Torx T10 10 0515 0372 4 M3 0x 0 5 8 mm used for Type N connectors N9927 90003 FieldFox Analy
6. Remove the RFI O ring Remove the old insulator and install a new one Position the new type N RF connector in the RF bottom shield making sure that it aligns with the cable connector underneath Loosely install the cable connector nut Install a new RFI O ring over the new type N RF connector in the position shown Loosely reinstall the two screws item 2 Note the location for these two screws in the illustration To ensure proper alignment install two additional screws finger tight in the two empty holes in the type N RF connector then tighten the two screws that secure the connector Remove the two alignment screws Tighten the cable connector nut s on cable W1 or W2 Perform the steps under Post replacement Procedure on page 7 44 Figure 7 20 Replacing the Type N RF Connectors and RF Cables RFI O ring Type N RF Connector RFI O ring Insulator Insulator Cable W2 Cable W1 2 places on each connector n9912_90003_719 7 30 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Replacing the Real Time Clock RTC Battery Located on the A5 System Board Shield IMPORTANT The RTC battery is a Lithium ion battery and must be disposed of properly Refer to Battery Disposal on page 1 7 for important instructions on disposing of this battery Perform the steps under Pre replacement Procedure on page 7 21 Refer to Figure 7 22 Disconnect W
7. SD memory card Wait 15 seconds for the analyzer to verify the device connection and then check the operation of the USB flash memory or SD memory card by performing the recall function Save Recall If the device performs correctly the USB or SD Card port is functioning properly e If the device does not perform correctly the System board is faulty Refer to Replacing the A5 System Board on page 7 35 4 8 N9927 90003 FieldFox Analyzer Troubleshooting Measurement Group Troubleshooting Measurement Group Troubleshooting Make sure the unit is warmed up for at least 30 minutes Make sure the correct cal kit definition is being used erase user data to force use of factory cal kit definitions see Chapter 8 for information on the Erase User Data Utility Problems in NA Mode Every FieldFox contains a factory calibration that was performed at the port 1 and port 2 connectors over the entire frequency range of the FieldFox using a number of data points that allows reasonable interpolation over the FieldFox frequency range This calibration known as CalReady allows you to immediately make accurate measurements for a DUT that is connected directly at the test ports PORT 1 and or PORT 2 CalReady corrects measurements when the FieldFox is turned ON when Preset is pressed and when a measurement is created with no other correction in place If you are seeing a problem at Preset perform the standard S parameter t
8. 2 8 analyzer miscellaneous replaceable parts part numbers 6 13 options 2 4 system block diagram 5 4 warmup time 3 3 ANSI Z540 standards compliant calibration Option A6J 2 8 assemblies replacement cautions about 7 4 list of procedures 7 5 sequence 6 4 7 4 warnings about 7 4 B battery cable removal and replacement 7 8 5 20 information screen 5 20 operation 5 17 5 20 temperature 5 25 battery disposal 1 7 battery main removal and replacement 7 6 battery RTC removal and replacement 7 21 before applying power 1 4 calibration ANSI Z540 standards compliant Option A6J 2 8 commercial Option UK6 2 8 in CAT and NA modes 5 26 ISO 17025 standards compliant Option 1A7 2 8 one port 5 26 2 8 QuickCal 5 26 two port 5 26 care of connectors 3 4 case group removal and replacement procedure 7 8 cases removal and replacement 7 8 caution 1 3 CE mark 1 6 check operational 3 7 checklist before return to customer 3 6 checks and procedures manual 7 45 commercial calibration Option UK6 2 8 compare instrument serial numbers 7 45 connector care principles of 3 4 quick reference 3 4 connectors care of 3 4 contacting Agilent 2 9 CPU board operation 5 17 removal and replacement 7 27 CSA mark 1 6 D display illustrated 6 5 operation 5 6 parts list 6 5 removal and replacement 7 21 documentation optional 1 3 part numbers 6 13 standard 1 3 E earth gr
9. Source Power Test N9927 90003 3 9 Tests and Adjustments FieldFox Analyzer Adjustments Agilent N7841A Software Package Adjustments Agilent N7841A Software Package The adjustments section of the Agilent N7841A software package may be used to fine tune your analyzer The N7841A software package is not included with the analyzer it must be ordered separately It can be downloaded from the Internet and a license purchased on line or it can be ordered on a CD ROM Go to www agilent com find calibrationsoftware for further information There are nine adjustments that are used to adjust the general functions of the analyzer and the SA spectrum analyzer specific functions Total adjustment time may be up to 5 hours depending upon models and options installed If multiple adjustments are to be performed perform them in the order listed by the N7841A software Details for these adjustments and recommended troubleshooting information can be found in the N7841A help file Adjustments Max Power and IF Overload Adjustment Source Power Adjustment Error Terms Adjustment See Performance Tests Agilent N7841A Software Package on page 3 9 This adjustment should be performed every 12 months It refreshes the definition of the preset calibration Frequency Accuracy Adjustment LO Feedthru Adjustment Absolute Amplitude Adjustment Frequency Response Adjustment e Attenuator Slope Adjustment IF Frequency Re
10. 500 625 000 14 625 000 1250 000 15 1250 000 2500 000 16 2500 000 5000 000 17 5000 000 10000 000 18 10000 000 15000 000 19 15000 000 20000 000 20 20000 000 26500 000 N9927 90003 5 9 Theory of Operation FieldFox Analyzer Measurement Group The RF Out attenuator between the source and the reflectometer has three settings nominal values of 0 dB 35 dB or user input value The setting is determined by the High Low or Manual power setting on the user interface And beginning from firmware A 06 18 the default output power level is 15 dBm The reflectometer performs three functions It passes the source output signal to either PORT 1 or PORT 2 e It samples the source output to either PORT 1 or PORT 2 e Itsamples the incoming signal at either PORT 1 or PORT 2 The sampled signals are mixed with the LO signal to produce three 390 kHz IF signals NA A NA B and NA R The reflectometer dissipates up to 1 5 watts when active Each port PORT 1 and PORT 2 has a DC isolation capacitor 5 10 N9927 90003 FieldFox Analyzer Theory of Operation Measurement Group SA RF Section An external RF input signal can be analyzed when connected to the Port 2 SA RF Input connector Before the input signal is mixed the signal will go through the input attenuator and optional internal preamplifier The input attenuator default setting from the factory is 10 dB The input attenuator is used to control the amount of power at the in
11. Assistance Calibration options available Page 2 8 Important information about shipping your analyzer to Agilent for service or repair Maintenance WARNING To prevent electrical shock disconnect the analyzer from the mains source before cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internally Physical Maintenance Clean the analyzer case using a dry or slightly damp cloth only Electrical Maintenance Refer to Contacting Agilent on page 2 9 and to Chapter 3 Tests and Adjustments 2 2 N9927 90003 FieldFox Analyzer General Product Information Analyzer Models Max Freq GHz N991x Combo N992x VNA N993x SA 4 N9913A X X 6 5 N9914A X X 9 N9915A N9925A N9935A 14 N9916A N9926A N9936A 18 N9917A N9927A N9937A 26 5 N9918A N9928A N9938A N9927 90003 Analyzer Models 2 3 General Product Information Analyzer Options Analyzer Options FieldFox Analyzer Below is a list of options that effect hardware for the FieldFox at the time of initial product release Additional options will be added as product features are enhanced Go to www agilent com find fieldfox2 for information on currently available upgrade options Table 2 1 Options Option Description N991x Combo N992x VNA N993x SA 010 VNA Time Domain Available Av
12. Electrostatic Discharge ESD This is important If not properly protected against electrostatic discharge can seriously damage your analyzer resulting in costly repair CAUTION reduce the chance of electrostatic discharge follow all of the recommendations outlined in Electrostatic Discharge Protection on page 1 5 for all of the procedures in this chapter Assembly Replacement Sequence After identifying the problem requiring an assembly to be replaced follow these steps Step 1 Order a replacement assembly Refer to Chapter 6 Replaceable Parts Step 2 Replace the faulty assembly and determine what adjustments are necessary Refer to Chapter 7 Repair and Replacement Procedures Step 3 Perform the necessary adjustments Refer to Chapter 3 Tests and Adjustments Step 4 Perform the necessary performance tests Refer to Chapter 3 Tests and Adjustments N9927 90003 4 3 Troubleshooting FieldFox Analyzer Getting Started with Troubleshooting Getting Started with Troubleshooting Where you begin troubleshooting depends upon the symptoms of the failure If a performance test or adjustment fails refer to the troubleshooting recommendations in the N7841A TME Help For other failures start by checking the basics as outlined in the following section Also review the flowchart in Figure 4 1 on page 4 5 You should then be able to determine where in the troubleshooting procedure to begin to
13. Group Assemblies Tools Required e T 8 TORX driver set to 6 in Ib e T 10 TORX driver set to 9 1n Ib e Small flat blade screwdriver e 5 16 inch open end torque wrench set to 10 in Ib e 9 16 inch open end torque wrench set to 21 in Ib Repair and Re assembly Kit Refer to Miscellaneous Parts on page 6 13 WARNING Before beginning any repair remove the battery and disconnect external power Removing All Measurement Group Assemblies as One Unit 1 Separate the front and rear cases Refer to Separating the Front and Rear Cases on page 7 10 2 Refer to Figure 7 18 Disconnect the A5 System board to FPIB cable W14 at the FPIB connector using the small flat blade screwdriver If replacing this cable disconnect both ends 3 Liftthe measurement group assemblies out of the front case and position them to the side of the front case as shown 4 Disconnect the A2 LCD to A5 System board cable W11 at the A5 System board connector It is necessary to first remove the adhesive tape that is over the connector To replace this cable refer to Replacing the A2 LCD the LCD Shield and LCD Cables on page 7 23 5 The measurement group assemblies are now completely separated from the analyzer 6 To remove the I O panel refer to Replacing the I O Side Panel Doors and Gasket on page 7 14 N9927 90003 7 27 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assem
14. Power Battery Related Information Battery Description and Operation The main battery is an SBS Smart Battery System compliant pack of lithium ion cells Refer to Battery Disposal on page 1 7 for important information about replacing and disposing of this battery The nominal voltage of the battery is 10 8 volts and normally varies from 9 to 12 volts The battery has built in sensors a processor and control circuitry This is referred to as the Smart Battery circuitry The Smart Battery circuitry communicates battery condition and history information digitally via a digital Smart Batt Bus The Smart Battery circuitry is read only Both the battery charging circuit and the System Monitor read battery information over the Smart Batt Bus The battery temperature reported by the analyzer is based on a sensor inside the battery Temperature information is available over the Smart Batt Bus The thermistor connection T on the battery is not used The Smart Battery circuit may shut down the battery when the temperature is out of the acceptable range or when the battery charge is too low See the Working with the Lithium Ion Battery section of the FieldFox User s Guide for additional information on built in charge level gauge the battery information screen battery care Battery Information Screen Refer to the FieldFox User s Guide for information on how to access this screen Most of the items displayed on
15. Unplug the A6 SOM board from the A5 System board Plug the new A6 SOM board into the A5 System board Install four new screws item 2 from the Repair and Re assembly Kit and tighten them in the torque sequence indicated by the circled numbers 090 in the illustration Replace the System board shield by replacing the 19 screws Torque to 12 in lbs Place the RTC board onto the System board shield and secure with the two screws Torque to 9 in lbs 4 To remove the I O panel refer to Replacing the I O Side Panel Doors and Gasket on page 7 14 5 Perform the steps under Post replacement Procedure on page 7 44 7 32 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7 22 Remove System Board Shield 2 19 places Come OS Cable W17 2 2 places RTC Board 1 CPU SOM replace1 N9927 90003 7 33 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assemblies Figure 7 23 Replacing the A6 SOM Board 3 3 2 1 4 places ur UL CPU_SOM_replace2 7 34 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Replacing the A5 System Board 1 Separate the front and rear cases See Separating the Front and Rear Cases on page 7 10 2 Remove all measurement group assemblies as one
16. cable as shown 10 Re connect the RPG cable W12 to the A3 FPIB connector as indicated with the A2 LCD to A3 FPIB cable W13 passing beneath it as shown Bend the RPG cable toward the right side as shown Place the LCD shield back in position on the A2 LCD Make sure that the A2 LCD to A3 FPIB cable W13 is routed between not under the shield gaskets 1 12 Secure the shield with four new screws item 2 provided in the Repair and Re assembly Kit 13 Perform the steps under Post replacement Procedure on page 7 26 N9927 90003 7 25 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Front Panel Group Assemblies Figure 7 17 Replacing the Front Panel Interface Board A2LCD to A3 FPIB Cable W13 Remove W12 here RPG Cable W12 RPG A3 Front Panel Interface X Board FPIB A3 Front Panel Interface Board FPIB fp inter Post replacement Procedure 1 Reinstall the measurement group assemblies RF top panel A4 RF board A5 System board and A6 SOM board as one unit with the I O panel attached Refer to Removing and Replacing the Measurement Group Assemblies on page 7 27 2 Combine the front and rear cases Refer to Combining the Front and Rear Cases on page 7 18 7 26 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Removing and Replacing the Measurement
17. domain reflection or transmission response Gating available to remove unwanted responses View time and frequency domain data simultaneously Transform frequency domain to the time domain or time domain to the frequency domain Option 030 Remote Control Capability Option 030 adds remote control capability to FieldFox for iDevices User must supply iPad iPhone or iPod User must download free FieldFox app from App store Option 100 3 5 mm APC Connectors Option 100 provides 3 5 mm input and output connectors Available on N9938A model only 26 5 GHz at initial purchase Option 112 QuickCal Option 112 provides a calibration that is performed automatically using calibration standards that are built in to the FieldFox Calibration standards are automatically switched in as needed QuickCal is ideal for making quick DTF and cable loss measurements without taking the time to perform a full O S L Cal Option 210 Vector Network Analyzer Transmission Reflection A base combination analyzer includes a cable and antenna analyzer Available on N9991x Combination models Base option available for N9992x models only Option 210 adds A vector network analyzer mode with transmission reflection or S21 and S11 measurements both magnitude and phase Available calibrations are CalReady one port OSL response and enhanced response Insertion loss measurement to the base cable and antenna analyzer or CAT mode e 2 port transmission measu
18. locate the failed assembly Check the Basics A problem can often be solved by repeating the procedure you were following when the problem occurred Before calling Agilent Technologies or returning the instrument for service please perform the following checks 1 Does the analyzer have power available It is recommended that the battery is installed and the AC power adapter is also connected 2 Does the analyzer turn On and Off when the On Off Button is pressed When the unit is on the green LED below the button should light 3 Does the analyzer power up normally into its default mode If not see Power Up Troubleshooting on page 4 6 4 If other equipment cables and connectors are being used with the analyzer make sure they are clean connected properly and operating correctly 5 Review the procedure for the measurement being performed when the problem appeared Are all the settings correct If not correct them 6 If the analyzer is not functioning as expected return it to a known state by pressing the Preset key 7 Ifthe problem is thought to be due to firmware check to see if the instrument has the latest firmware before starting the troubleshooting procedure Refer to Firmware Upgrades in Chapter 8 for instructions 4 4 N9927 90003 FieldFox Analyzer Troubleshooting Getting Started with Troubleshooting Troubleshooting Organization Follow the flowgraph in Figure 4 1 to help direct you to the correct s
19. or equivalent type recommended Discard used batteries according to local ordinances and or manufacturer s instructions No operator serviceable parts inside Refer servicing to qualified personnel To prevent electrical shock do not remove covers For continued protection against fire hazard replace line fuse only with same type and rating The use of other fuses or material is prohibited WARNING The detachable power cord is the instrument disconnecting device It disconnects the mains circuits from the mains supply before other parts of the instrument The front panel switch is only a standby switch and is not a LINE switch disconnecting device 1 4 N9927 90003 FieldFox Analyzer Safety and Regulatory Information Electrostatic Discharge Protection Electrostatic Discharge Protection Protection against electrostatic discharge ESD is essential while removing assemblies from or connecting cables to the network analyzer Static electricity can build up on your body and can easily damage sensitive internal circuit elements when discharged Static discharges too small to be felt can cause permanent damage To prevent damage to the instrument always have a grounded conductive table mat in front of your test equipment always wear a grounded wrist strap connected to a grounded conductive table mat having a 1 MQ resistor in series with it when handling components and assemblies or when making connections always
20. places RFbd remove N9927 90003 7 39 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assemblies Figure 7 28 RF Board Separation RFbd_separate 7 40 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7 29 RF Shield Torque Pattern rf_shield_torque N9927 90003 7 41 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assemblies Reinstalling All Measurement Group Assemblies as One Unit 1 Reinstall the I O side panel if needed Refer to Replacing the I O Side Panel Doors and Gasket on page 7 14 Refer to Figure 7 30 Position the measurement group assemblies to the side of the front case Reconnect the LCD to System board cable at the System board connector and place a strip of adhesive tape over the connector to secure it This strip of adhesive tape is provided in the Repair and Re assembly Kit If necessary refer to Replacing the A2 LCD the LCD Shield and LCD Cables on page 7 23 Position the measurement group assemblies on top of the front case and align the I O side panel in the groove in the front case being careful not to damage the gasket Position tuck the LCD to System board cable in between the LCD shield and the A5 System board goes between the speaker side panel so that it will not interfere with the cases when
21. post repair procedures 7 44 power control 5 18 management 5 18 operation 5 18 smart management operation 5 18 5 18 pre repair procedures caution about 7 3 warnings about 7 3 protection against ESD 1 5 3 3 4 3 7 3 Q QuickCal 5 26 R removing assemblies See specific assembly parts See specific part repair post repair procedures 7 44 caution about 7 3 warnings about 7 3 repair and reassembly kit contents 6 13 part number 6 13 replaceable parts in front panel illustrated 6 5 part numbers 6 5 listing of 6 5 miscellaneous analyzer part numbers 6 13 ordering information 6 3 replacement Al keypad 7 8 7 21 7 27 assembly cautions about 7 4 list of procedures 7 5 sequence 6 4 7 4 warnings about 7 4 case group procedure 7 8 CPU board 7 27 front panel group assemblies 7 21 LCD shield 7 21 main battery 7 6 7 27 RE assembly 7 27 7 21 replacement sequence 4 3 returning to customer checklist 3 6 RF assembly removal and replacement 7 27 RF board operation 5 7 RF connectors removal and replacement 7 27 RF top assembly removal and replacement 7 27 RPG manual check 7 45 removal and replacement 7 21 RPG knob removal and replacement 7 21 RTC battery removal and replacement 7 21 N9927 90003 Index S safety considerations 1 3 earth ground 1 3 symbols 1 3 screen temp 5 25 SD card used to install firmware 7 45 service battery maintenance 8 7
22. the main battery when the analyzer is not connected to external power should not cause any problems Simply re apply power No firmware problems are expected Of course this does not apply during a firmware upgrade Smart Power Management The analyzer uses extensive load switching to minimize power dissipation This is termed Smart Power Management SPM There are two motivations for power management e to extend battery run time to prevent overheating Sections of the circuitry are selectively powered down via load switching depending on the operating mode of the analyzer Five different sections of the circuitry on the A4 RF board may be controlled via load switching These sections are as follows e Source switched off during SA mode switched off between sweeps during CAT or NA modes LO switched off when data is not being taken by receivers e SA switched off when in one port CAT or NA modes on all the time in two port mode e Reflectometer switched to low power through state when RF OUT port receivers are inactive e High Band switched off when not required On the A5 System board each of the ADC s may be individually switched to a low power mode when not active Load switching is generally transparent to the user One obvious exception is the that the source turns off during retrace in the CAT and NA modes N9927 90003 5 19 Theory of Operation FieldFox Analyzer Grounding and
23. this signal as a common frequency reference when making measurements using external equipment Filters MUX and ADC s The three Filters filter the IF signals in preparation for the ADC Filter characteristics are fixed not programmable The ADC s digitize each of the IF signals received from the A4 RF board The input to one of the ADC s is multiplexed between the NA A and NA B input signals The 14 bit ADCs sample at a rate of 30 mega samples per second Each ADC may be put into a low power mode when not active Temperature Sensors The SB1 Temp Sensor is located on the A4 RF board side of the A5 System board near the headphone jack J3 The SB2 Temp Sensor 15 on the A4 RF board side of the 5 System board near the edge of the board against the battery compartment This temperature sensor is not under a shield Audio Output The speaker is located on the left side panel of the case Left and right audio signals from the A6 SOM board go to the headphone jack on the A5 System board These signals are then combined to create a single mono signal for the speaker An amplifier drives the speaker Plugging in the headphones disables the speaker output LAN Connector The LAN connector supports the LAN interface on the A6 SOM board See LAN Interface on page 5 30 for more details SOM Connector Refer to SOM Board on page 5 17 for information on SOM System on Module functions 5 16 N9927 90003 FieldFox An
24. wear a heel strap when working in an area with a conductive floor If you are uncertain about the conductivity of your floor wear a heel strap always ground yourself before you clean inspect or make a connection to a static sensitive device or test port You can for example grasp the grounded outer shell of the test port or cable connector briefly always ground the center conductor of a test cable before making a connection to the analyzer test port or other static sensitive device This can be done as follows 1 Connect a short from your calibration kit to one end of the cable to short the center conductor to the outer conductor 2 While wearing a grounded wrist strap grasp the outer shell of the cable connector 3 Connect the other end of the cable to the test port and remove the short from the cable Figure 1 1 shows a typical ESD protection setup using a grounded mat and wrist strap Refer to ESD Supplies on page 6 14 for part numbers Figure 1 1 ESD Protection Setup Wrist Strap A 3 Wire line power cord with proper connection to ground must be used for ESD protection Anti Static Mat esd_setup N9927 90003 Safety and Regulatory Information FieldFox Analyzer Regulatory Information Regulatory Information This section contains information that is required by various government regulatory agencies Instrument Markings A Ge C US ICES NMB 001 Qno A 1 6 The instruction docu
25. 1 Input Attenuator Setting dB 33 75 MHz I F Output Level dBm 0 6 5 11 10 16 15 21 20 26 25 31 30 36 If the 33 75 MHz I F Output level is not correct or the input attenuator performance is out of tolerance the most likely cause is the A4 Board N9927 90003 4 13 Troubleshooting FieldFox Analyzer Measurement Group Troubleshooting 4 14 N9927 90003 5 Theory of Operation N9927 90003 5 1 Theory of Operation Information in This Chapter FieldFox Analyzer Information in This Chapter This chapter provides a general description of the operating theory of the FieldFox analyzer Theory of operation is explained to the assembly level only e Component level circuit theory is not provided Simplified block diagrams are included for each functional group 5 2 Section Title Summary of Content Start Page Analyzer System Operation A summary of the theory of operation for the analyzer page 5 3 A summary of the operation of the major functional groups of the analyzer Front Panel Group Operation of the assemblies associated with the front page 5 5 panel group of assemblies Measurement Group Operation of the assemblies associated with the page 5 7 measurement group of assemblies Operation in Modes Description of the different operating modes and what page 5 22 hardware is used in each mode Temperature Related Information Information about tem
26. 17 from the System board Remove the two screws item 2 that attach the RTC board item 1 to the System board shield KRW Refer to Figure 7 21 The RTC battery slips into the carrier on the RTC board with the positive polarity side facing up 5 Place the RTC board onto the System board shield with the battery towards the shield and secure with the two screws Torque to 9 in lbs 6 Perform the steps under Post replacement Procedure on page 7 26 Figure 7 21 Replacing the RTC Battery battery rtc N9927 90003 7 31 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assemblies Replacing the SOM Board 1 Separate the front and rear cases Refer to Separating the Front and Rear Cases on page 7 10 2 Remove all measurement group assemblies as one unit Refer to Removing All Measurement Group Assemblies as One Unit on page 7 27 3 To replace the A6 SOM board a Refer to Figure 7 22 Remove the RTC board Refer to Replacing the Real Time Clock RTC Battery Located on the A5 System Board Shield on page 7 31 Remove the System board shield by removing the 19 screws item 2 Discard the screws new ones are provided in the Repair and Re assembly Kit Refer to Figure 7 23 Remove the four screws item 2 that secure the A6 SOM board item 1 to the A5 System board Discard these screws new ones are provided in the Repair and Re assembly Kit
27. 6 4 N9927 90003 FieldFox Analyzer Replaceable Parts Replaceable Parts Listings Replaceable Parts Listings Entire Analyzer Figure 6 1 Entire Analyzer Exploded View Case Group Front Panel Group Measurement Group Case Group RPG Knob Front Panel Group Battery Miscellaneous Parts x complete Descriptions and part numbers for the assemblies and parts in each group shown in the above illustration can be found at the following locations e Front Panel Group on page 6 6 Measurement Group on page 6 8 e Case Group on page 6 11 Miscellaneous parts and accessories not illustrated in any of these groups are listed under Miscellaneous Parts on page 6 13 N9927 90003 6 5 Replaceable Parts Replaceable Parts Listings Front Panel Group FieldFox Analyzer Reference Designator Part Number Qty Description Replacement Assemblies A3 Front Panel Board Assembly N9927 60110 Front Panel Board Assembly Includes A3 front panel interface board Separately Replaceable Individual Parts and Assemblies A1 N9912 40001 1 Keypad assembly A2 N9927 60118 1 LCD assembly 6 5 inch TFT VGA wil N9927 60007 1 Cable A2 LCD to A5 System board W13 N9927 60005 1 Cable A2 LCD to A3 Front Panel Interface board W14 N9927 60009 1 Cable ribbon A3 Front Panel Interface board to A5 System board 1 1000 1485 1 LCD lens filter 2 N9927
28. 60011 1 LCD Bracket assembly 3 0515 1946 13 Screw machine 90 deg flat head Torx T10 M3 0 x 6 mm 4 1990 3613 1 RPG Rotary Pulse Generator Includes cable W12 nut and washer 5 W1312 40066 1 RPG knob 6 1420 0905 1 Battery Lithium ion For Real Time Clock RTC backup 1 Each time the FieldFox case is opened for any reason you must order a Repair and Re assembly Kit See Miscellaneous Parts on page 6 13 6 6 N9927 90003 FieldFox Analyzer Replaceable Parts Replaceable Parts Listings Figure 6 2 Front Panel Group Exploded View Front View 4 places 3 1 Rear View x frontpanel N9927 90003 6 7 Replaceable Parts Replaceable Parts Listings Measurement Group FieldFox Analyzer NOTE Each time the FieldFox case is opened for any reason you must order a Repair and Re assembly Kit See Miscellaneous Parts on page 6 13 Reference Designator Part Number Qty Description Replacement Assemblies N9927 60111 N9918A RF Assembly Includes N9928A A4 RF board N9938A Cable W1 semi rigid RF OUT NA port N9927 60200 N9913A Cable W2 semi rigid RF IN SA port 8 O Ring gasket 8160 0963 qty 2 female Type N to female 3 5 mm qty 2 nsulator qty 1 1 EMI ring N9927 20064 gty 2 19 Shield top RF N9927 60202 N9916A 21 Shield bottom RF N9917A 22 Screw 26 places N9926A N9927A N9936A N9937A System Board Assembly
29. ARRANTY TERMS IN THE SEPARATE AGREEMENT WILL CONTROL DFARS Restricted Rights Notice If software is for use in the performance of a U S Government prime contract or subcontract Software is delivered and licensed as Commercial computer software as defined in DFAR 252 227 7014 June 1995 or as a commercial item as defined in FAR 2 101 a or as Restricted computer software as defined in FAR 52 227 19 June 1987 or any equivalent agency regulation or contract clause Use duplication or disclosure of Software is subject to Agilent Technologies standard commercial license terms and non DOD Departments and Agencies of the U S Government will receive no greater than Restricted Rights as defined in FAR 52 227 19 c 1 2 June 1987 U S Government users will receive no greater than Limited Rights as defined in FAR 52 227 14 June 1987 or DFAR 252 227 7015 b 2 November 1995 as applicable in any technical data Certification Agilent Technologies Inc certifies that this product met its published specifications at the time of shipment from the factory Agilent Technologies Inc further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members Title 2 N9927 90003 Fieldfox Analyzer Assistance
30. Agilent Technologies FieldFox MW VNA SA Service Guide This manual provides documentation for the following instruments FieldFox MW Analyzers N9913A N9914A N9915A N9916A N9917A N9918A FieldFox MW VNA N9925A N9926A N9927A N9928A FieldFox MW SA N9935A N9936A N9937A N9938A More Application Information and Pricing available at n a wz TestWorld 250 Technology Way sales testworld com Rocklin CA 95765 1 855 200 TEST 8378 Click to go www TestWorld com M Manufacturing Part Number Part Number N9927 90003 Printed in USA July 2014 Agilent Technologies Inc 2013 2014 x Agilent Technologies Fieldfox Analyzer Warranty Statement THE MATERIAL CONTAINED IN THIS DOCUMENT IS PROVIDED AS IS AND IS SUBJECT TO BEING CHANGED WITHOUT NOTICE IN FUTURE EDITIONS FURTHER TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW AGILENT DISCLAIMS ALL WARRANTIES EITHER EXPRESS OR IMPLIED WITH REGARD TO THIS MANUAL AND ANY INFORMATION CONTAINED HEREIN INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AGILENT SHALL NOT BE LIABLE FOR ERRORS OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING USE OR PERFORMANCE OF THIS DOCUMENT OR ANY INFORMATION CONTAINED HEREIN SHOULD AGILENT AND THE USER HAVE A SEPARATE WRITTEN AGREEMENT WITH WARRANTY TERMS COVERING THE MATERIAL IN THIS DOCUMENT THAT CONFLICT WITH THESE TERMS THE W
31. Disposal on page 1 7 for important instructions on disposing of this printed circuit board with the battery attached If necessary the battery can be removed from the printed circuit board and disposed of separately 1 Perform the steps under Pre replacement Procedure on page 7 21 2 Refer to Figure 7 17 Remove the four screws item 2 that secure the LCD shield and remove the LCD shield Discard the four screws new ones are provided in the Repair and Re assembly Kit Be careful The A2 LCD display is now loose and will fall out of the front case if the case is tipped Disconnect the RPG cable W12 at the A3 FPIB connector as indicated Disconnect the A2 LCD to FPIB cable W13 at the A3 FPIB connector as indicated Remove the nine screws item 3 that secure the A3 FPIB to the front case Push the nine rubber nubs through the A3 FPIB to release the Al keypad The Al keypad is permanently attached to the front case and must remain Bota P 7 Position the new A3 FPIB in the front case over the A1 keypad and using needle nose pliers pull the nine rubber nubs on the Al keypad through the holes in the A3 FPIB Make sure that all nine of the rubber nubs are fully extended on the back side of the FPIB 8 Secure the A3 FPIB to the front case with nine new screws item 3 provided in the Repair and Re assembly Kit 9 Re connect theA2 LCD to FPIB cable W13 to the A3 FPIB connector as indicated Route the
32. E SYNTHESIZER MULTIPLIER ATTEN Digital Control Unlock Signals RF2 RF1 FPGA SERIAL BUS SENSOR SENSOR STDS FieldFox Analyzer EM erede Iwi Hret PORT 2 block_rf_carsonsa 4 11 2013 N9927 90003 FieldFox Analyzer Theory of Operation Measurement Group NA Section An LO synthesizer produces a single LO signal from the 90 MHz time base located on the A5 System board The LO output is delivered to the NA mixers of both ports The LO frequency is always above the measured frequency The IF is 390 kHz The LO output is switched between the NA mixers and the SA first converter depending on the function being used At any instant in time either the NA receivers or the SA receiver may be active but not both at the same time The 90 MHz time base is also used to generate a source signal in the source synthesizer that covers the frequency range of 10 MHz to 26 5 GHz The source signal is generally rich in harmonic content This is acceptable because the signal is used with tuned receivers The frequency bands for the NA circuitry on the RF board are listed below Band Instrument Start Stop Pl 0 030 2 035 2 2 035 2 425 3 2 425 4 500 4 4 500 4 850 5 4 850 9 350 6 9 350 9 700 7 9 700 19 100 8 19 100 19 500 9 19 500 38 800 10 38 800 78 000 11 78 000 156 250 12 156 250 312 500 13 312
33. E audi 5 28 Beer oe rnc 5 29 Uppers nih ede eu see ews 5 29 EEUU USC pu canes 5 30 6 Replaceable Parts Tieton Me SANE ERE E EIER E EE PEE EE PE Rad P EE EE Rd ES 6 2 Contents 2 Service Guide N9927 90003 Contents Orderne Inbortation ped Eee REED Oy EERE 6 3 Assembly Replacement ea WAR era 6 4 Replaceable Paris ed des nce Ra UHR AUCH REGE RR EGRE p 6 5 AnalyZet peice QNO ETERS 6 5 Front Panel OLED E ER ER EHE C RER RD 6 6 Measurement HR Purdue d qd E 6 8 COUR MPH TT 6 11 Miscellaneous ES ESE OED 6 13 7 Repair and Replacement Procedures in This Chapler etx pU NEPTIS E eR eS 7 2 Personal WAS bike deed ad ba ades 7 3 queri PM EN 7 3 Elgcetrostate Discharge ESD Protection cuu denk ra ek tiria Re n RR RE RR Rr ER Rd p er 7 3 Assembly Replace
34. EO EES EEDE EEEE TEDES EEEREN 8 4 S Lodi ethane pb Db Cedo ih embeds ibd b E dei bao eb tape 8 5 To View Currently Installed Options ER REG OU 8 5 puns 8 5 cos ceca O PAN PRU T TE 8 6 To Check the Curent Finnwaie Revistas 8 6 Miscellaneaus Service and Maintenance i250 bse ecko XR dee Rr RR nt 8 7 ccn me EEUU 8 7 8 7 Appendix A FieldFox S parameter Measurement Uncertainty for System Verification A 2 Corrected measurement RO e e e wie he s ed A 3 Corrected measurement ouod bad e RR eke Ronen ERU E GER RR RR UR EUR eased A 4 Service Guide N9927 90003 Contents 3 Contents Contents 4 Service Guide N9927 90003 1 Safety and Regulatory Information N9927 90003 Safety and Regulatory Information Information in This Chapter FieldFox Analyzer Information in This Chapter This chapter provides safety information that will help protect you and your network analyzer It also contains information that is required by various government regulatory agencies Section Title Summary of Content Start Page Descriptions of CAUTIO
35. For most screens under System 7 key the current measurement mode continues to operate while the screen is displayed For instance while the battery information screen is displayed the measurement mode remains active There are two exceptions to this the Options Licensing screen Error Log screen When either of these screens is displayed the firmware is in a special monitor mode and measurements are suspended N9927 90003 5 23 Theory of Operation FieldFox Analyzer Operation in Modes CAT NA and VVM Modes CAT NA and VVM modes have some similar capabilities but are still separate operating modes Measurement similarities Return Loss S11 magnitude Insertion Loss 521 magnitude Unlike S11 and S21 the values displayed below zero for Return Loss and Insertion Loss are not negative There is user control of output power level which is high low or manual setting on the RF Out Atten 35 dB in or out SA and CPM Mode SA Mode measures signals at the SA RF IN connector SA Mode measurements require NO calibration The signal path for SA mode is the same as the input path for two port CAT NA modes The RF In Atten can be set from 0 through 30 dB in 5 dB steps The Attenuator Slope Adjustment determines the correction factors for each step in each frequency band The RF In Atten can be controlled manually or automatically When in auto mode the Reference Level setting determines the attenuator se
36. GHz 0 5 to 2 GHz 2 to 8 GHz lt 2 to 8 GHz n Rd i B to 18 GHz E 10 2 a 100 80 Magnitude uncertainty dB K 2 m N9927 90003 40 20 0 Transmission magnitude dB 80 60 Transmission magnitude dB Transmission uncertainty S21 512 Reflection magnitude dB ee 205 GHz 1 0 5 to 2 GHz 100 2108GH 8 to 18 GHz z c i 5 10 3 E i NN 9 ti mit Erreser 8 5 1 20 15 10 5 0 40 35 30 25 20 0 20 lt 0 5 GHz 0 5 to 2 GHz T 2108GHz 8 to 18 GHz 15 10 5 0 Reflection magnitude dB Reflection uncertainty S11 S22 Appendix 3 Appendix A FieldFox S parameter Measurement Uncertainty for System Verification FieldFox Analyzer Corrected measurement uncertainty Power level of 15 dBm 10 Hz IF bandwidth no averaging battery saver off and 90 minute warm up time Includes uncertainties due to drift noise compression and dynamic accuracy Coverage factor of x2 applied to uncertainties Full 2 port calibration 85052D 3 5 mm calibration kit spec Corrected Performance lt 0 5 GHz 0 5 to 8 GHz 8 to 20 GHz 20 to 26 5 GHz Directivity 42 dB 38 dB 36 dB 30 dB Source Match 37 dB 31 dB 28 dB 25 dB Load Match 38 dB 33 dB 29 dB 24 dB Reflection Tracking 0 005 dB 0 006 dB 0 009 dB 0 012 dB Transmission T
37. Group The front panel group consists of the following assemblies e Front Panel Interface Board e A2LCD Assembly Refer to Figure 5 1 for a simplified overall block diagram which includes the front panel group A3 Front Panel Interface Board The main function of the A3 Front Panel Interface board is to support the user interface but it also contains the digital power supplies USB Microcontroller The USB Microcontroller senses the keypad keys and the RPG rotary pulse generator knob on the front panel The USB Microcontroller communicates with the A5 System board via a USB interface There is no separate ID EPROM on the A3 Front Panel Interface board All ID information is stored in the USB Microcontoller Keypad Lights and ON OFF Button The power for the keypad LED s generated on the A3 Front Panel Interface board is derived from the 5 V digital supply The keypad LED s are turned on for a few seconds following each key press This function is controlled by the firmware on the A6 SOM board The On Off LED is controlled by a signal from the A5 System board The connections for the On Off Button and LED are direct to the A5 System board LCD Backlight Power for the backlight on the A2 LCD assembly is generated on the A3 Front Panel Interface board Digital 5 volts is converted to approximately 25 volts The actual voltage determines the brightness of the backlight Two control lines from the A5 System board control on off and int
38. N and WARNING ee symbols used throughout this manual i oa General Safety Considerations A list of safety points to consider when servicing Page 1 3 your network analyzer A discussion of electrostatic discharge ESD and Electrostatic Discharge Protection related recommendations and requirements for ESD Page 1 5 protection Definitions of instrument markings Regulatory Information Instructions for disposing of the analyzer s lithium Page 1 6 battery 1 2 N9927 90003 FieldFox Analyzer Safety and Regulatory Information Safety Symbols 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 CAUTION WARNING Caution denotes a hazard It calls attention to a procedure that if not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a caution note until the indicated conditions are fully understood and met Warning 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 note until the indicated conditions are fully understood and met General Safety Considerations Safety Earth Ground WARNING CAUTION N9927 90003 This is a Safety Class I product provided with a protective earthing ground incorporated in
39. Ordering Information Ordering Information To order a part listed in the replaceable parts lists e include the part number indicate the quantity required e Contact Agilent Technologies for instructions on where to send the order Refer to Contacting Agilent on page 2 9 To order a part that is not listed in the replaceable parts lists e include the instrument model number and complete instrument serial number include the description and function of the part indicate the quantity required Contact Agilent Technologies for instructions on where to send the order Refer to Contacting Agilent on page 2 9 N9927 90003 6 3 Replaceable Parts FieldFox Analyzer Assembly Replacement Procedure Assembly Replacement Procedure The following steps describe how to replace an assembly in the analyzer Step 1 Identify the faulty group Begin with Chapter 4 Troubleshooting Follow up with the appropriate troubleshooting chapter that identifies the faulty assembly Step 2 Order a replacement assembly Refer to this chapter for part numbers and ordering information Step 3 Replace the faulty assembly and determine what adjustments and performance tests are necessary Refer to Chapter 7 Repair and Replacement Procedures Step 4 Perform the necessary adjustments Refer to Chapter 3 Tests and Adjustments Step 5 Perform the necessary performance tests Refer to Chapter 3 Tests and Adjustments
40. Replacement The actual procedures for removing and replacing the See Table 7 1 Procedures major assemblies in your analyzer List of Procedures The procedures occur in assembly reference on page 7 5 designator numerical order for specific procedures Post Repair Procedures A table of the proper tests verifications and Page 7 44 7 2 adjustments to perform on your analyzer after repair N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Personal Safety Warnings Personal Safety Warnings WARNING WARNING These servicing instructions are for use by qualified personnel only To avoid electrical shock do not perform any servicing unless you are qualified to do so Danger of explosion if battery is incorrectly replaced Replace only with the same or equivalent type recommended Discard used batteries according to manufacturer s instructions Safety Earth Ground WARNING CAUTION This is a Safety Class I product provided with a protective earthing ground incorporated in the power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact Any interruption of the protective conductor inside or outside of the instrument will make the instrument dangerous Intentional interruption is prohibited Always use the three prong AC power cord supplied with this product Failure to ensure adequate grounding by not using this
41. Replacement Procedures Removal and Replacement Procedures Table 7 1 List of Procedures Reference Designator or Name Assembly Description Location Main battery Primary power battery Page 7 6 Case parts All enclosure case parts Page 7 8 Al Keypad Page 7 17 RPG RPG part of front panel group Page 7 21 A2 LCD Page 7 23 A3 Front panel interface board Page 7 25 a Measurement Group Assemblies as One Unit Page 7 27 RF Top Panel RF Top Panel Assembly Page 7 29 RF Connectors and Cables part of RF board Page 7 30 REC DaHety aie ae i the A5 System board shield Pus d A6 SOM board Page 7 32 AS System board Page 7 35 A4 RF board Page 7 39 N9927 90003 7 5 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Main Battery Removing and Replacing the Main Battery Tools Required None IMPORTANT Refer to Battery Disposal on page 1 7 for important instructions on disposing of the old battery Replacing the Main Battery 1 Disconnect the power cord 2 Refer to Figure 7 1 Remove the battery compartment door by pushing in on the detent and then sliding the door downwards 3 Note the orientation of the battery for installation of the replacement 4 Remove the old battery and install the new battery in the battery compartment 5 Reinstall the battery compartment door by aligning it in position and then sliding it upwards until an au
42. UT EXT Dc I i T i UNREG DC I i DIGITAL SWITCHING POWER SUPPLIES i i BOARD INRUSH amp l ANALOG LINEAR POWER Ii EN ee tag REGULATORS and AC ADAPTER SHUTDOWN LOAD SWITCHING 1 H Used on System board i block_system_carsonsa 4 11 2013 5 14 N9927 90003 FieldFox Analyzer Theory of Operation Measurement Group System Monitor SM Microcontroller This is the heart of the analyzer It is active whenever there is DC power available The microcontroller has ultra low power dissipation It is sometimes referred to as the MSP 430 The following is a list of some of the functions performed by the SM e t monitors the On Off button on the front panel and responds appropriately e tcontrols the on off functions of the various power supplies in the analyzer tdrives the On Off button LED e Itreads battery pack information via the Smart Batt Bus e It communicates with the battery charger IC via the Smart Batt Bus e Jtinterfaces to the Battery Charger and Manager circuit e It interfaces to the Serial Bus for communication with the temperature sensors ID EPROM s on the printed circuit boards It communicates to the SOM board CPU via a serial port UART Jt stores the instrument model number and serial number USB Hub This circuitry expands the number of USB ports available to the FieldFox firmware Power Management and Power Supplies Seven
43. ailable 030 Remote Control Capability Available Available Available 100 3 5 mm APC Connectors N9938A 112 QuickCal Available Available 210 VNA Transmission Reflection Available Base Model 211 VNA Full 2 Port S Parameters Available Available 220 Tracking Generator See 210 Available 233 Spectrum Analyzer Available Base Model 235 Preamplifier Available Available 236 Interference Analyzer and Spectrogram Available Available 238 Spectrum Analyzer Time Gating Available Available 302 USB Power Sensor Support Available Available Available 305 Cable and Antenna Analyzer Included in Available Base 307 GPS Receiver Available Available Available 308 Vector Voltmeter Available Available 309 DC Bias Variable Voltage Source Available Available Available 310 Built In Power Meter Available Available Available 320 Reflection Measurements RL VSWR Included in Available Base 2 4 N9927 90003 FieldFox Analyzer General Product Information Analyzer Options Option Descriptions Option 010 Vector Network Analyzer Time Domain With Option 010 or time domain FieldFox computes the inverse Fourier transform of the frequency domain data to display reflection or transmission coefficients versus time Time domain gating can be used to remove unwanted responses such as connector mismatch or cable discontinuities and the results can be displayed in either time or frequency domain Fully error corrected time
44. all the rear case onto the front case See Combining the Front and Rear Cases N9927 90003 7 13 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Case Group Parts Replacing the I O Side Panel Doors and Gasket 1 Separate the front and rear cases See Separating the Front and Rear Cases on page 7 10 2 Refer to Figure 7 8 Disconnect the A5 System board to A3 FPIB cable W14 at the A3 FPIB connector If replacing this cable disconnect both ends Figure 7 8 L M en a ee SSS 7 14 Cm od amp amp Removing Measurement Group Assemblies as One Unit Disconnect cable W14 from A3 front panel interface board here Remove adhesive tape and VO Side Panel disconnect cable W11 here meas group1 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Case Group Parts 3 Remove the measurement group assemblies RF top panel assembly A4 RF board A5 System board and A6 SOM board as one unit with the I O panel attached but do not disconnect cable W11 from between the A2 LCD and the A5 System board Refer to Removing and Replacing the Measurement Group Assemblies on page 7 27 4 Refer to Figure 7 9 Remove the two screws item 5 that secure the I O side panel to the A5 System board and remove the I O side panel Figure 7 9 Replacing the I O Side Panel W16 Speaker Cable
45. alyzer Theory of Operation Measurement Group A6 SOM Board The A6 SOM System on Module board plugs directly into the A5 System board as a daughter board and contains the CPU 64 MB of flash ROM 128 MB of RAM real time clock and e I O interface The interfaces on the SOM are e UART to the System Monitor on the A5 System board LCD interface e Left and right audio outputs SD card bus USB host interface Interface to USB hub LAN interface 10 100 base T General purpose interface lines The A6 SOM board is powered by the 3 3 volt digital supply Licenses which enable instrument options are stored in the A6 SOM flash ROM A7 Real Time Clock Board The battery for the RTC real time clock on the A7 RTC is connected to the A6 SOM board via the A5 System board The battery powers the RTC when the FieldFox is powered off Chapter 7 provides instructions for replacing the battery on the A7 RTC board Main Battery The battery is a rechargeable 10 8 V lithium ion type Refer to Battery Disposal on page 1 7 for important information about replacing and disposing of this battery Refer to Battery Related Information on page 5 20 for details on the main battery N9927 90003 5 17 Theory of Operation FieldFox Analyzer Grounding and Power Grounding and Power Grounding Each printed circuit board has a single ground plane The ground planes on the A4 RF board and A5 System board are connec
46. ard All external connections for the analyzer come through the A5 system board except for the PORT 2 and PORT 1 ports The A5 System board also controls the power switching and power management The instrument model number and serial number are stored on the A5 System board N9927 90003 5 13 Theory of Operation Measurement Group FieldFox Analyzer Figure 5 3 Simplified System Board Block Diagram TRIG IN J4 i A5 SYSTEM BOARD i ad 90 MHz 1 i NAR NAIF FILTER i H NA A NA IF 90 MHz FILTER REFERENCE i BOARD i NA B NAIF T QUT S i FILTER i SAJF SA IF 90 MHz e FILTER pe 2 IF OUT TOIFROM 4 FPGA SERIAL BUS i A4 RF FPGA i BOARD SYSTEM i N VIDEO E 1 USB DEVICE PORT part of FPGA 1 M NS 6 s 4 sp rg S0 SDCARD o HEAD PHONES gu id i i atc USB s p USB HOST y HOST USB I PORTS lt Q USB ee i HUB SPEAKER 14055 i 3 3V i i i GPS i i RECEIVER K GPSANT i i i i i USB to SERIAL RS 232 BUS ID CONVERTER i EPROM i i i i i SERIAL BUS SYSTEM MONITOR i i TO FROM i MICROCONTROLLER ON OFF BUTTON LED FRONT TOFROM Ire seRiALeus SERIAL SMART BATT BUS j PANEL BOARD pus INTERFACI MUX i BOARD VARIABLE VOLTAGE DC OUTP
47. ble to work together as a system to measure common passive devices to the accuracy of the published FieldFox S parameter specifications After a full 2 port calibration of FieldFox using either the QSOLT or SOLR method a variety of standards from an Agilent Verification Kit are measured and the results are compared with factory data of those standards The uncertainty charts in this appendix can be used to check that the verification standards are within the expected limits This process does not guarantee the specified performance of individual components of the system only the system as a whole Appendix 2 N9927 90003 FieldFox Analyzer Appendix A FieldFox S parameter Measurement Uncertainty for System Verification Corrected measurement uncertainty Power level of 15 dBm 10 Hz IF bandwidth no averaging battery saver off and 90 minute warm up time Includes uncertainties due to drift noise compression and dynamic accuracy Coverage factor of x2 applied to uncertainties Full 2 port calibration 85054D Type N m calibration kit spec Corrected Performance lt 0 5 GHz 0 5 to 2 GHz 2 to 8 GHz 8 to 18 GHz Directivity 40 dB 40 dB 36 dB 34 dB Source Match 38 dB 33 dB 33 dB 27 dB Load Match 37 dB 35 dB 32 dB 27 dB Reflection Tracking X 0 006 dB 0 006 dB 0 009 dB 0 027 dB Transmission Tracking X 0 08 dB t 0 1 dB 0 15 dB 0 43 dB zi 2 0 5 GHz lt 0 5 GHz 05102
48. blies Figure 7 18 Removing All Measurement Group Assemblies as One Unit Disconnect cable W14 from A3 front panel interface board here 52 o e aq EE e amp e NEN Remove adhesive tape and ya Side Pane disconnect cable W11 here meas_group1 7 28 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Replacing the RF Top Panel Assembly 1 2 Separate the front and rear cases Refer to Separating the Front and Rear Cases on page 7 10 Remove all measurement group assemblies as one unit Refer to Removing All Measurement Group Assemblies as One Unit on page 7 27 Refer to Figure 7 19 Unplug the two connector plugs tethered caps from the type N RF connectors Disconnect cable W3 and W4 Remove the six screws item 1 and lift the RF top panel over the type N RF connectors Position the new RF top panel over the type N RF connectors and loosely reinstall the six screws item 1 Do not tighten these screws at this time they will be tightened after the front and rear cases have been combined Connect cable W3 and W4 to the A5 System board connectors There should be an audible click when the connector is fully in place Position tuck the cables W3 and W4 into the cavity above the A5 System board to avoid interference with nearby parts Plug the two connec
49. bly Kit Refer to Figure 7 16 Connectors CN3 and CN4 near the connector for cable W13 should be covered by a strip of adhesive tape as shown If not cut a strip of adhesive tape provided in half and apply to each connector Press down firmly on the tape to conform it to the contours of the connectors and to ensure proper adhesion Reinstall the LCD shield with four new screws provided in the Repair and Re assembly Kit 4 Perform the steps under Post replacement Procedure on page 7 26 N9927 90003 7 23 Repair and Replacement Procedures Removing and Replacing the Front Panel Group Assemblies Figure 7 16 Replacing the A2 LCD the LCD Shield and LCD Cables 1 LCD Shield A2 LCD to A3 FPIB Cable 1 RPG Cable W12 RPG A3 Front Panel Interface Board FPIB The LCD shield was removed for the photo below CN3 and CN4 provide power for the LCD backlight Adhesive Tape CN3 iw n Connector CN2 for Cable W13 7 24 m Adhesive Tape 4 T FieldFox Analyzer A2 LCD Display Adhesive Tape A2 LCD to 5 System Board Cable W11 lcd replace N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Front Panel Group Assemblies Replacing the A3 Front Panel Interface Board FPIB IMPORTANT The A3 front panel interface board contains a Lithium ion battery Refer to Battery
50. cleaning the display 8 7 2 9 erase user data utility 8 3 options 2 8 procedures caution about 7 3 post repair 7 44 warnings about 7 3 related user operations 8 3 static safety parts part numbers 6 14 tools part numbers 6 13 view current firmware revision 8 3 warranty standard 2 8 three year return to Agilent 2 8 service test equipment 3 5 shipment for service or repair 2 9 smart power management operation 5 18 SOM board operation 5 17 standards compliant calibration ANSI Z540 Option A6J 2 8 ISO 17025 Option 1A7 2 8 strap handle removal and replacement 7 8 supplies ESD part numbers 6 14 support contacting Agilent 2 9 options 2 8 system board operation 5 13 T temperature battery pack 5 25 related information 5 25 screen 5 25 test equipment service 3 5 tests 3 10 performance N7841A 3 9 tools service part numbers 6 13 troubleshooting front panel group 4 7 measurement group 4 9 power up 4 6 where to begin 4 4 U upgrades firmware 5 28 user accessible files 5 28 user data erase utility 8 3 view current firmware revision 8 3 8 5 temperature readings 8 3 warm analyzer 3 3 warning 1 3 warranty service standard 2 8 three year return to Agilent 2 8 N9927 90003 Index 3 Index Index 4 N9927 90003
51. cord may cause product damage Electrostatic Discharge ESD Protection CAUTION N9927 90003 Many of the assemblies in this instrument are very susceptible to damage from electrostatic discharge ESD Perform the following procedures only at a static safe workstation and wear a grounded wrist strap This is important If not properly protected against electrostatic discharge can seriously damage your analyzer resulting in costly repair To reduce the chance of electrostatic discharge follow all of the recommendations outlined in Electrostatic Discharge Protection on page 1 5 for all of the procedures in this chapter 7 3 Repair and Replacement Procedures FieldFox Analyzer Assembly Replacement Sequence Assembly Replacement Sequence The following steps show the sequence that you should follow to replace an assembly in the FieldFox analyzer Step 1 Identify the faulty group Begin with Chapter 4 Troubleshooting Step 2 Order a replacement assembly Refer to Chapter 6 Replaceable Parts Step 3 Replace the faulty assembly and determine what adjustments are necessary Refer to Post Repair Procedures in this chapter Step 4 Perform the necessary adjustments Refer to Chapter 3 Tests and Adjustments Step 5 Perform the necessary performance tests Refer to Chapter 3 Tests and Adjustments 7 4 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removal and
52. crews are provided in the Repair and Re assembly Kit 12 Tighten the six screws item 8 that secure the RF top panel Figure 7 14 Combining the Front and Rear Cases 3 7 8 8 gms CR 1 Do not o no Iu e block i 6 Is screw hole 7 n9912 90003 713 13 Reinstall the battery Refer to Removing and Replacing the Main Battery on page 7 6 7 20 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Front Panel Group Assemblies Removing and Replacing the Front Panel Group Assemblies Tools Required e T 8 TORX driver set to 6 in Ib e T 10 TORX driver set to 9 1n Ib e 7 16 inch hex nut wrench or nut driver set to 9 in Ib Repair and Re assembly Kit Refer to Miscellaneous Parts on page 6 13 e Soldering tool Required only for battery replacement WARNING Before beginning any repair disconnect the power cord Pre replacement Procedure 1 Separate the front and rear cases Refer to Separating the Front and Rear Cases on page 7 10 2 Remove the measurement group assemblies RF top panel A4 RF board A5 System board and A6 SOM board as one unit with the I O panel attached Refer to Removing and Replacing the Measurement Group Assemblies on page 7 27 Replacing the RPG and RPG Knob 1 Refer to Figure 7 15 Remove the two hole plugs
53. ct Brightness press Edit then use the arrow keys to change the display brightness Ifthe A2 LCD display assembly is determined to be faulty replace it Refer to Replacing the A2 LCD the LCD Shield and LCD Cables on page 7 23 e Use the arrow keys to select Volume press Edit then use the arrow keys to change the volume A beep should occur each time the value is changed Plug headphones into the unit if there is no sound from the internal speaker The internal speaker is disabled when headphones are plugged in e If the audio is still not heard the System board may be faulty Refer to Replacing the A5 System Board on page 7 35 Checking the Front Panel Keys To check the front panel keys push each labeled key and compare with the specific functions e fallthe key names are correct then the front panel keypad is working e Ifsome of the keys are not working suspect a faulty keypad To replace the keypad refer to Replacing the Front Case including the A1 Keypad on page 7 17 e Ifnone of the keys are working correctly suspect a faulty Front Panel Interface board To replace the A3 Front Panel Interface board refer to Replacing the A3 Front Panel Interface Board FPIB on page 7 25 N9927 90003 4 7 Troubleshooting FieldFox Analyzer Front Panel Group Troubleshooting USB and SD Card Slot Ports To verify proper operation of any rear USB ports or SD Card port Connect a known good USB flash memory
54. d 1 6 Instrament Marines auus dece PDC eSI PP dd Vea 1 6 Bar DEDOS eeri eean Sheds SUPER MER EHE RR MEME 1 7 2 General Product Information orien Those Per ose ERRARE EPA RARE ede Ri EE RIS 2 2 2 2 Physical s 2 2 ROB vos P PXUCRREECEPRISURREDUERPUCPEP SERERE 2 2 dono OTT 2 3 DDHOHS 2 45454 Rime tian tiA rearea hie 2 4 db cran e CET 2 5 Agilent Support Services and E RERIMORERID ERBEN 2 8 Serice and Support ODONIS L5 esq osse d bari RA 2 8 Calibrate CIDIOBS PEPER OSES ES SAPE E oe KE E PX EC ELS 2 8 Contee ey Seb RGR SELES OOS EG Ce ew dee ee 2 9 Shipping Your Analyzer to Agilent for Service or csse sese bree ences 2 9 3 Tests and Adjustments Turormastios in Viet Napier qi bed de 3 2 Before You NER 3 3 Protect Against Electrostatic Discharge BS used asus FREU ERR dads 3 3 AT tie Anaiyzer to Ware PECHERDUERERDC PE REDUCED KRER LC OYEP I DX dab 3 3 Review the Principles at Connectar C HIE io
55. dFox Analyzer Theory of Operation Measurement Group Measurement Group The measurement group produces a stable output signal by phase locking a synthesized voltage controlled oscillator VCO The measurement group consists of the A4 RF Board A5 System Board A6 SOM Board A7 Real Time Clock Board Main Battery A simplified RF block diagram is provided in Figure 5 2 A simplified system block diagram is provided in Figure 5 3 A4 RF Board A basic function of the A4 RF board is to provide a signal source and receivers for the analyzer functions There are two sections to the A4 RF board NA RF section SA RF section N9927 90003 5 7 Theory of Operation Measurement Group Figure 5 2 Simplified RF Block Diagram 10 20 GHz a VCO DIVIDER J 45M FRAC N fo E en 2 i VERNIER FEE To MULTIPLIER AND ATTENUATOR block 1 i i NA A 390 kHz p 1 NAR Q S 390 kHz 2 UX 1 i 1st LO SYNTHESIZER 10 20 GHz 2 MHz 26 GHz Qo iu i 45 MHz LOGIC SS i p 1 i NABI a i A z 5 I 9 i JL JE Dp u 1 REFLECTOMETER p From SOURCE REFLECTOMETER 5 i SYNTHESIZER z PRESCALAR PRESCALAR 5 2ND amp 3RD x i LO SYNC 4132 10 324 MULTIPLIER ATTEN 5 i l H i 900 MHz 4500 MHz or SS Un i 9000 MHz i i 2ND CONV SA i lt X 5 8 A4 RF BOARD SOURC
56. dible click is heard 7 6 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Main Battery Figure 7 1 Replacing the Main Battery Detent Push here and slide downwards Compartment n9912 90003 701 N9927 90003 7 7 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Case Group Parts Removing and Replacing the Case Group Parts Tools Required T 8 TORX driver set to 6 in lb T 10 TORX driver set to 9 in lb Isopropyl alcohol Use only in a well ventilated area Repair and Re assembly Kit Refer to Miscellaneous Parts on page 6 13 WARNING Before beginning any repair disconnect the power cord Replacing the Kickstand Hinge Cover and Hinge 1 Refer to Figure 7 2 Remove and discard the four screws item 1 from the kickstand hinge cover New screws are provided in the Repair and Re assembly Kit Figure 7 2 Replacing the Kickstand and Hinge Cover a TT 1 laces ae 4p 41 99 4 Hinge Cover TK Kickstand n9912_90003_702 7 8 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Case Group Parts 2 To replace the entire kickstand assembly a Lift the kickstand assembly off of the rear case and discard it b Place the new kickstand as
57. different analog supply voltages are generated from the Unreg DC All of these are used on the A4 RF board and some are used on the A5 System board Some sections of the circuitry on the A4 RF board may be switched to low power modes to conserve power and minimize heat This is accomplished through load switching See Power Management Circuitry on page 5 12 for more information The System Monitor controls the on off functions of the analog power supplies All are on or off together except for power sequencing This circuitry also monitors the Ext DC input and if below 10 8 volts or above 21 volts it disconnects this input from the Unreg DC FPGA This FPGA provides the interface between the A6 SOM board and the ADC provides miscellaneous interfaces for circuitry on the A4 RF board and communicates with the CPU via the USB interface N9927 90003 5 15 Theory of Operation FieldFox Analyzer Measurement Group Time Base The Time Base is an internal TCXO that produces 90 MHz signals for use throughout the analyzer A 10 MHz signal at the Ref In Trig input may be used to provide an external time base The external time base function is controlled via the user interface Refer to the Frequency Reference Source section of the FieldFox Analyzer User s Guide Part Number N9927 90001 for additional information The internal 10 MHz frequency reference is available from the Ref Trig Out connector on the right side panel Use
58. e software automatically configures your analyzer to execute the performance tests The N7841A software package is not included with the analyzer it must be ordered separately It can be downloaded from the Internet and a license purchased on line or it can be ordered on a CD ROM Go to www agilent com find calibrationsoftware for further information There are seventeen performance verification tests that test for the general functionality of the analyzer and the SA spectrum analyzer specific functionality Total test time may be up to 3 hours depending upon model and options installed Details for these tests and recommended troubleshooting information can be found in the N7841A help file Performance Verification Tests Error Terms Test Note that the associated adjustment should be performed every 12 months See Adjustments Agilent N7841A Software Package on page 3 10 Frequency Accuracy Test e Displayed Average Noise Level Test Frequency Readout and Count Accuracy Test Frequency Response Test Noise Sidebands Test Total Abs Amp Accy Low Freq Test Total Abs Amp Accy Low Freq Preamp On Test Total Abs Amp Accy High Freq Test Total Abs Amp Accy High Freq Preamp On Test Third Order Intermodulation Distortion Test e Absolute Amplitude Accuracy Test Dynamic Accuracy Test System Dynamic Range Test Receiver Compression Trace Noise Test GPS Function Test DC Bias Source Test
59. eable Parts Listings Reference Designator Part Number Qty Description 13 0515 1940 4 Screw machine w patch lock pan head Torx T8 M2 5x0 45 6 mm 14 3110 0654 1 Friction hinge N9912 00003 Spacer 16 W1312 40068 1 Hinge cover 17 0515 2217 4 Screw machine button head Torx T8 M3 0 x 8 mm 18 N9927 60006 1 Cable assembly battery Figure 6 4 Case Group Exploded View 4 places 4 places 4 places 13 14 16 17 5 8 2 places 6 places The front case 2 comes with the A1 keypad installed X case 6 12 N9927 90003 FieldFox Analyzer Replaceable Parts Replaceable Parts Listings Miscellaneous Parts Table 6 1 Part Numbers for Miscellaneous Parts and Accessories Description Model or Part Number Repair and Re assembly Kit IMPORTANT and the case depending upon the depth of the repair This kit is required each time the FieldFox case is opened for any reason The kit includes the following items some or all of which are necessary to re assemble the internal assemblies Repair and Re assembly Kit Includes the following items Screw machine 90 deg flat head Torx T10 M3 x 0 5 8mm qty 4 Screw machine 90 deg flat head Torx T10 M3 x 0 5 6 mm qty 17 Screw machine w patch lock pan head Torx T8 M2 5 x 0 45 6 mm qty 4 Screw machine w crest cup washer pan head Torx T10 M3 0 x 0 5 8 mm qty 4 Scr
60. ection for troubleshooting the analyzer Figure 4 1 N9927 90003 Troubleshooting Organization Flowchart Does the analyzer Go to Power Up Troubleshooting power up normally on page 4 6 Does the analyzer keypad and display operate properly Ge to Peyw PapetiGubligshooting ropbigshopting on page 4 7 rises Go to Measurement Group properly Troubleshooting on page 4 9 4 5 Troubleshooting FieldFox Analyzer Power Up Troubleshooting Power Up Troubleshooting If the display is operational but the unit does not boot up successfully Make sure there is sufficient power for the unit to operate Try re installing firmware using the firmware upgrade process described in Chapter 8 e Assume corrupted firmware on the SOM board follow the Install Firmware from SD Card near the end of Chapter 7 If the display is dark but the unit may have booted successfully Wait for three minutes to make sure the boot process has completed then press any front panel key If the boot process has completed successfully the keypad will flash when a key is pressed 4 6 N9927 90003 FieldFox Analyzer Troubleshooting Front Panel Group Troubleshooting Front Panel Group Troubleshooting Checking Display Brightness and Sound If the display is dark no backlight Press System 7 Select Preferences Select Preferences Use the arrow keys to sele
61. ed against electrostatic discharge can seriously damage your analyzer resulting in costly repair CAUTION reduce the chance of electrostatic discharge follow all of the recommendations outlined in Electrostatic Discharge Protection on page 1 5 for all of the procedures in this chapter Allow the Analyzer to Warm Up Before testing or adjusting the FieldFox analyzer allow it to warm up as described under DUT Warmup in the Getting Started section of the N7841A help file N9927 90003 3 3 Tests and Adjustments Before You Begin Review the Principles of Connector Care FieldFox Analyzer Proper connector care and connection techniques are critical for accurate and repeatable measurements Refer to Table 3 1 for tips on connector care Prior to making connections to your analyzer carefully review the information about inspecting cleaning and gaging connectors Refer to the calibration kit documentation for detailed connector care information For course numbers about additional connector care instruction contact Agilent Technologies Refer to Contacting Agilent on page 2 9 Table 3 1Connector Care Quick Reference Guide Handling and Storage Do Keep connectors clean Extend sleeve or connector nut Use plastic end caps during storage Do Not Touch mating plane surfaces Set connectors contact end down Store connectors or adapters loose Visual Inspection Use
62. ensity functions These control lines are driven by the system monitor microcontroller on the A5 System board Battery Charger and Manager This circuitry controls charging of the battery based on a battery charger IC This IC is powered by a digital output on the System Monitor The System Monitor has the capability to reset the IC if required by recycling the power to the IC This circuitry also controls the source of the Unreg DC Batt or Ext DC It reads the battery pack information via the Smart Batt Bus Batt Neg is connected to the A5 ground plane There is an input inrush current control circuit on the Ext DC input that limits inrush current to 4 amps Variable Voltage Source This circuitry provides a constant voltage intended to bias circuits under test The user interface for controlling this function may be accessed via System System Configuration N9927 90003 5 5 Theory of Operation FieldFox Analyzer Front Panel Group A2 LCD Assembly The A2 LCD assembly contains a 6 5 inch 640 x 480 TFT color LCD with associated drive circuitry and backlight inverter The LCD backlight is created by LED s connected in parallel stacks Backlight brightness is a function of the backlight power that ranges from 22 to 27 volts Refer to LCD Backlight on page 5 5 for more information The backlight LED s are arranged along the top and bottom edges of the display There are three stacks on each edge 5 6 N9927 90003 Fiel
63. ervice and Support Options e Calibration Options Contacting Agilent Shipping Your Analyzer to Agilent for Service or Repair Service and Support Options The analyzer s standard warranty is a one year return to Agilent Technologies service warranty NOTE There are other repair and calibration options available from Agilent Technologies Contact Agilent for additional information on available service agreements for this product Refer to Contacting Agilent on page 2 9 Calibration Options Commercial Calibration Certificate with Test Data A complete set of measurements that test the analyzer to the manufacturer s published specifications It includes a calibration label a calibration certificate and the corresponding calibration data report This calibration conforms to ISO 9001 ISO 17025 Standards Compliant Calibration A complete set of measurements that test the analyzer to the manufacturer s published specifications It includes a calibration label an ISO 17025 calibration certificate and the corresponding calibration data measurement uncertainties and guardbands on all customer specifications This calibration conforms to ISO 17025 and ISO 9001 This calibration option is available at the time of purchase or can be obtained later by sending your analyzer to Agilent for calibration Refer to Shipping Your Analyzer to Agilent for Service or Repair ANSI Z540 Standards Compliant Calibration A complete set of measu
64. es when operating at 20 to 30 C ambient temperature N9927 90003 5 21 Theory of Operation Operation in Modes FieldFox Analyzer Operation in Modes The FieldFox User s Guide describes the various modes of operation and describes the user interface for each mode The following information describes how the hardware is used in the various modes to make measurements There are six basic modes of operation e CAT Cable and Antenna Test e NA Network Analyzer e SA Spectrum Analyzer e VVM Vector Voltmeter e PM Power Meter USB Sensor e CPM Channel Power Meter CAT NA and VVM modes have similar capabilities but are separate modes of operation The six basic modes listed above represent how the hardware may be used to make basic measurements Additional modes will provide customized user interfaces but will not change how the basic measurements are performed The following table indicates various modes in FieldFox analyzers and the option dependencies See the Service Related User Operations section of Chapter 8 for more details Power Meter Power Meter Bs xia USB Sensor Built In Standard Option 210 Option 210 Option 210 Option 210 Option 210 Distance To Return Loss amp Return Loss Fault dB DTE dB VSWR DTF VSWR More Standard CAT Measure Cable Loss Insertion Loss DTF 1 Port 2 Port Lin S
65. est set troubleshooting procedure starting with the following procedure Checking the A B R1 and R2 Signals NA Mode Checking the A B R1 and R2 Signals NA Mode The first step is to verify that the A B R1 and R2 traces are present and that they are approximately level To access this 1 Press Trace 3 Select lt Num of Traces gt Choose lt x4 gt Select lt Trace 1 gt Press Measure 1 Choose lt Advanced gt Select lt A gt Repeat Steps 1 4 5 6 and 7 for Receivers B R1 and R2 FY m e Traces A B and R2 are displayed in four separate data windows as shown in Figure 4 2 Identifying discrepancies of the traces in these windows can help you to isolate the faulty assembly N9927 90003 4 9 Troubleshooting FieldFox Analyzer Measurement Group Troubleshooting Figure 4 2 Typical Four Channel Display x 141 183 215 116 4 9 2013 2 30 40 PM Ref 0 00 dB r2 Ref 0 00 dB Ref 0 00 dB Ref 0 00 dB Start 30 00 kHz IF BW 10 kHz Stop 18 00 GHz Points 201 Output Power 15 0 dBm e If all traces are present and are similar to the traces in Figure 4 2 then there are no major problems with the analyzer s VNA measurement system There may however be a minor failure in the analyzer To test further 1 Go to Chapter 3 Tests and Adjustments and perform all the tests indicated in the N7841A TME software 2 If a problem still exists contact Ag
66. ew machine 90 deg flat head Torx T10 M3 x 0 5 14 mm qty 6 Screw machine button head Torx T8 M3 x 0 5 8 mm qty 4 Screw machine w flat washer pan head Torx T10 M3 x 0 5 35 mm qty 6 Rectangular Laser Address Label O STRIP RFI Hollow 0 060 in OD 0 020 in ID qty 1 Tape 1 4 inch x 1 inch for LCD ribbon cable qty 4 Gasket Blank Panel qty 1 Gasket I O Panel qty 1 Cover hinge Ferrite Cores Kit containing ferrite cores for use on external LAN cable and headphones cable N9927 60130 0515 1035 0515 1946 0515 1940 0515 0372 0515 2349 0515 2217 0515 5153 7121 8321 8160 1725 N9912 20043 N9912 40002 N9912 40003 W1312 40068 N9927 60028 Service Tools 9 16 inch open end torque wrench set to 21 in Ib T 8 TORX driver set to 6 in lb N A T 10 TORX driver set to 9 in Ib N A 5 16 inch open end torque wrench set to 10 in Ib N A 7 16 inch hex nut wrench nut driver set to 9 in lb N A N A Documentation Users Guide Can also be printed from the Agilent Web site Refer to Printing Copies of Documentation from the Web on page 4 N9927 90001 Quick Reference Guide N9927 90002 Service Guide Not available in printed form Part number is for reference only Must be printed from the Agilent Web site Refer to Printing Copies of Documentation from the Web on page 4 N9927 90003 N9927 90003 6 13 Replaceable Parts FieldFox Analyzer Re
67. for details 7 44 Compare serial numbers All tests that apply to the installed option configuration Check time and date N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Post Repair Procedures Manual Checks and Procedures Manual Check of Keyboard Check that each key works properly Check that the keyboard backlight LEDs come on when a key is pressed Manual Check of LCD Press Service 7 gt Display then use Display Colors and Brightness keys to exercise the display Check for even brightness in the LCD backlight Manual Check of RPG Operation Activate a marker and use the RPG to move the marker Load Instrument Serial Number into the A5 System Board Instructions for this process may be accessed via the Load instrument serial number into System Board link at agilent com find fieldfox2 Install Firmware from SD Card A specially configured SD card must be used when the flash memory on the A6 SOM board is new or when SOM board memory has become corrupted Instructions for creating and using the SD card are available at the SD card for installing firmware link at agilent com find fieldfox2 Compare Serial Numbers Compare the serial number stored in the instrument memory with the serial number tag on the back of the instrument To access the stored serial number press System 7 gt Service Diagnostics gt System Information Check Sound See Checking Display B
68. from the back side of the front case next to the RPG 2 To replace the RPG knob a Insert a round shaft such as a screwdriver shaft into the exposed holes and push the RPG knob off of the RPG shaft to the front side of the front case b Install a new knob by aligning the D shaped detent in the knob with the D shape on the shaft and push the knob into position 3 To replace the RPG a Disconnect the RPG cable W12 from the A3 front panel interface board b Using a 7 16 inch hex nut wrench remove the hex nut from the RPG shaft c Pull the RPG out the back side of the front case and retrieve the lock washer from the front side d To install a new RPG reverse the above steps A new cable nut and washer are included with the new RPG When reinstalling the RPG cable W12 bend the cable toward the right side on top of the display to front panel interface board cable N9927 90003 7 21 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Front Panel Group Assemblies 4 Reinstall the hole plugs in the front case Apply one drop of isopropyl alcohol on each hole plug to lubricate it making it easier to install Use alcohol only in a well ventilated area View the hole plugs from the front to ensure that they are fully seated These hole plugs must be installed to maintain water tight integrity 5 Reinstall the RPG knob Refer to step 3 b of this procedure 6 Perform the steps under Post replacement P
69. gure 7 4 Separating the Front and Rear Cases 1 4 9912 90003 704 7 10 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Case Group Parts 4 Separate the cases and position the rear case to one side as shown in Figure 7 5 to allow access to the speaker side panel and strap handle 5 Remove the strap handle from the two dowel pins 6 Remove the speaker side panel from the groove in the front case Figure 7 5 Separating the Front and Rear Cases 2 Dowel Pin 2 places Strap Handle Speaker Side Panel case_separate N9927 90003 7 11 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Case Group Parts 7 Position the cases side by side as shown in Figure 7 6 8 Unplug the battery cable W15 from the 5 System board at the location indicated 9 The front and rear cases are now completely separated Figure 7 6 Separating the Front and Rear Cases 3 Speaker Side Panel gens end md case separate 3 cable 7 12 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Case Group Parts Replacing the Battery Cable 1 Separate the front and rear cases See Separating the Front and Rear Cases on page 7 10 2 Refer to Figure 7 7 Note the orientation of the cable for installation of the new cable then using a small flat blade screwdriver to move the cable connector re
70. he error log is cleared each time the analyzer is powered off Generally an entry in the error log is created whenever an error message is displayed EXAMPLE Attempting to set the frequency to a value of a decimal point will generate an entry in the error log Firmware Upgrades Firmware upgrades are available on the Internet Refer to instructions in the Update FieldFox Firmware section of the FieldFox Analyzer User s Guide Part Number N9927 90001 for details See Chapter 8 for instructions on viewing the current firmware revision The following information will be included in the display Firmware Release FieldFox application firmware revision e FPGA Rev code revision for FPGA SBM Boot Rev revision of boot code for System Microcontroller SBM Main Rev revision of main code for System Microcontoller A firmware upgrade includes three sections the FieldFox application firmware and the Windows CE operation system on the A6 SOM board the firmware in the System Monitor Microcontroller on the A5 System board the FPGA code on the A5 System board The System Monitor firmware update and the FPGA code update are executed only if not up to date It is important to maintain power to the analyzer during the update process After unplugging the USB flash memory stick during the firmware upgrade process wait for the analyzer to enter its default operating mode before operating the analyzer N9927 90003 5 29 The
71. he old front case and install them in the new case The other two dowel pins should already be installed in the case Make sure that the gaskets item 6 are all in place in the grooves that there are no gaps and that they are not damaged in any way Refer to Removing and Replacing the Front Panel Group Assemblies on page 7 21 to reinstall the front panel group assemblies removed in step 3 Refer to Removing and Replacing the Measurement Group Assemblies on page 7 27 to reinstall the measurement group assemblies removed in step 2 10 Reinstall the rear case onto the front case Refer to Combining the Front and Rear Cases on page 7 18 N9927 90003 7 17 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Case Group Parts Combining the Front and Rear Cases 1 Install a new gasket on the speaker side panel being careful not to stretch it or to damage it in any way Also make sure there is no slack in the gasket A new gasket is provided in the Repair and Re assembly Kit the speaker side panel uses the larger of the two gaskets provided If an old gasket must be removed carefully remove it with tweezers being careful not to damage the groove 2 If anew gasket has not been installed on the I O side panel install it at this time It will be necessary to remove the I O side panel from the A5 System board Refer to Replacing the I O Side Panel Doors and Gasket on page 7 14 for ins
72. ieldFox Analyzer General Purpose Maintenance and Service Procedures Service Related User Operations Service Related User Operations To View Currently Installed Options Press System 7 Press System Configuration Press Options Press Show Options A list of the currently installed options is displayed To View the Current Firmware Revision Etc Press System 7 Press Service Diagnostics Press System Information The System Information screen includes the following information L1 Model Number instrument model number Serial Number instrument serial number Firmware Release version of installed firmware LI Network Identity computer name and current IP address LJ RF Serial Number serial number of RF PCA A4 SB Serial Number serial number of System Board PCA A5 FP Serial Number serial number of Front Panel PCA A3 CJUserData Erased the most recent date and time User Data Erase performed To View the Error Log Press System 7 Press Service Diagnostics Press Error Log See the Firmware Related Information section of Chapter 5 for details on the error log N9927 90003 8 3 General Purpose Maintenance and Service Procedures FieldFox Analyzer Service Related User Operations To View Temperature Readings Press System 7 Press Service Diagnostics Press Internal Temperatures See the Temperature Related Information section of Chapter 5 for de
73. ify the operating environment Before You Begi 3 3 TOREM e Protect Against Electrostatic Discharge ESD ET Allow the Analyzer to Warm Up e Review the Principles of Connector Care Servite Tit A list of additional equipment recommended for servicing the Page 3 5 FieldFox analyzer Before Returning an A list of things to do before returning an instrument to a Instrument to a Customer Customer after servicing is completed Page 3 6 Operio Check An operation check that should be performed before returning Page 3 7 an instrument to a customer Performance Tests A list of performance tests included in the Agilent N7841A Agilent N7841A software package Page 3 9 Software Package Adjustments Agilent A list of adjustments included in the Agilent N7841A software N7841A Software package Page 3 10 Package 1 The Agilent N7841A software package must be purchased separately Go to www agilent com find calibrationsoftware for information 3 2 N9927 90003 FieldFox Analyzer Tests and Adjustments Before You Begin Before You Begin Before checking verifying or adjusting the analyzer refer to the following paragraphs to Make sure the operating environment is within 19 to 27 C and 5 to 95 humidity Make sure that proper electrostatic discharge ESD protection is provided Review the principles of connector care Protect Against Electrostatic Discharge ESD This is important If not properly protect
74. ilent Refer to Contacting Agilent on page 2 9 If any of the traces are not present are noisy or distorted or are at an incorrect level then there is a problem with the analyzer s measurement system and requires repair contact Agilent Refer to Contacting Agilent on page 2 9 4 10 N9927 90003 FieldFox Analyzer Troubleshooting Measurement Group Troubleshooting Problems in SA Mode The instruments unique signal analyzer blocks that are located on the A4 RF Board can be verified using a signal source and a functioning spectrum analyzer capable of measuring a 33 75 MHz signal Verifying the 33 75 MHz LF Output Set the signal source for a 1 GHz CW signal at 0 dBm If possible verify the signal source output frequency and power level are correct by using a functioning spectrum analyzer as illustrated in Figure 4 3 Figure 4 3 1 GHz CW Signal 121 Tue 01 Oct 2013 12 33 44 PM Ref 0 00 dBm Atten 10 dB Center 1 000000 GHz Span 100 0000 MHz Res BW 1 000 MHz VBW 1 000 MHz Swp 81 00 ms 401 pts N9927 90003 4 11 Troubleshooting FieldFox Analyzer Measurement Group Troubleshooting Inject that 1 GHz CW signal into the Port 2 SA RF Input connector on the instrument as illustrated in Figure 4 4 From an instrument preset tune the instrument to 1 GHz 0 Span Verify that the input attenuator Atten is set to 10 dB On the side of the instrument near the RPG tuning knob there is a spring door Open that spring door and
75. inutes Heat in the port connectors may affect the accuracy of the standards Factory Calibration CalReady When the analyzer is adjusted at the factory or during annual calibration a preset calibration is stored in the analyzer CalReady The preset calibration covers the full frequency range of the analyzer The preset calibration is active whenever CalRdy is displayed on the left side of the screen Presetting the analyzer activates the preset calibration The preset calibration provides very good measurement performance at the PORT 1 and Port 2 connectors when the analyzer has thermally stabilized at room temperature The preset calibration should be re characterized every 12 months to maintain accuracy This is accomplished via the Error Terms adjustment in the TME Refer to Chapter 3 QuickCal The QuickCal function mathematically extends the preset calibration to the end of a cable or adapter It is a firmware only function it does not involve analyzer hardware Table 5 1 Cal Status Indicators Indicator Meaning Additional Indicators interpolation active CalRd Preset factory calibration is active y y Measurement conditions have changed interpolation active on ds achive Measurement conditions have changed interpolation active Cal ON U User calibration is active Measurement conditions have changed Cal OFF Calibration is inactive N
76. ish to send your network analyzer to Agilent Technologies for service or repair Include a complete description of the service requested or of the failure and a description of any failed test and any error message e Ship the analyzer using the original or comparable antistatic packaging materials Contact Agilent for instructions on where to ship your analyzer Refer to Contacting Agilent on page 2 9 N9927 90003 2 9 General Product Information FieldFox Analyzer Agilent Support Services and Assistance 2 10 N9927 90003 Tests and Adjustments N9927 90003 Tests and Adjustments Information in This Chapter Information in This Chapter FieldFox Analyzer This chapter contains procedures to help you check verify and adjust your FieldFox analyzer The checks verify the operation of the assemblies in your analyzer The adjustments allow you to tune your analyzer for maximum response NOTE The Agilent N7841A software package is required to test and adjust your analyzer This software package must be purchased separately It can be downloaded from the Internet and a license purchased on line or it can be ordered on a CD ROM Go to www agilent com find calibrationsoftware for further information The help file for the N7841A software package is also available at this URL Section Title Summary of Content Start Page Items to consider or procedures to perform before testing is begun e Ver
77. isopropyl alcohol Clean connector threads Do nspect all connectors carefully Do Not Use a damaged connector ever Look for metal particles scratches and dents Connector Cleaning Do Try compressed air first Do Not Use any abrasives Get liquid into plastic support beads Gaging Connectors Do Use the correct gage type Clean and zero the gage before use Use correct end of calibration block Gage all connectors before first use Do Not Use an out of specification connector Making Connections Align connectors carefully lightly Turn only the connector nut Make preliminary connection contact Use a torque wrench for final connection Do Not Apply bending force to connection Over tighten preliminary connection Twist or screw any connection Tighten past torque wrench break point 1 Cleaning connectors with alcohol shall only be done with the instrument s power cord removed and in a well ventilated area Allow all residual alcohol moisture to evaporate and the fumes to dissipate prior to energizing the instrument 3 4 N9927 90003 FieldFox Analyzer Tests and Adjustments Service Test Equipment Service Test Equipment The test equipment required for the TME based N7841A test and adjustment software is listed in the N7841A help file The following additional test equipment is recommended when servicing the FieldFox analyzer Mai
78. justed to compensate for the delta temperature The internal temperature of the unit is critical when executing the TME based software for tests and adjustments See the TME help for detailed information Under typical bench top indoor conditions the internal temperature of the unit will be about 20 C above ambient once the internal temperature has stabilized It will typically take 60 to 90 minutes for the internal temperature to stabilize when a cold unit is turned on N9927 90003 5 25 Theory of Operation FieldFox Analyzer User Calibration in CAT NA and VVM Modes User Calibration in CAT NA and VVM Modes There are three types of calibrations for the CAT NA and VVM modes CalReady QuickCal and Mechanical Cal See the FieldFox Analyzer User s Guide Part Number N9927 90001 Calibration for CAT NA and VVM Modes section for specific instructions for performing these calibrations Because NA CAT and VVM modes are very similar a calibration that is performed in one mode can also be applied in the other modes When a user calibration is performed the full frequency range of the analyzer is calibrated even though the current state of the analyzer may be less than the full range This allows a calibration to be interpolated beyond the frequencies set at the time of calibration an asterisk on the display indicates interpolation Do not leave cal standards connected to the PORT 2 or PORT 1 ports for more than three m
79. l Assembly Includes 8 N9927 60120 1 9 Battery Door Rear Encl A ly Includes N9927 60117 ear Enclosure Assembly Includes 11 Rear case Kick Stand Assembly Includes 15 Kickstand W1312 40065 14 Friction hinge and spacer 09 1 13 Screw for hinge qty 4 16 Hinge cover 17 Screw for hinge cover qty 4 Separately Replaceable Individual Parts and Assemblies Combination Nameplate Set N9927 80021 1 Nameplate N9913A 4 GHz N9927 80022 1 Nameplate N9914A 6 5 GHz N9927 80013 1 Nameplate N9915A 9 GHz N9927 80014 1 Nameplate N9916A 14 GHz N9927 80015 1 Nameplate N9917A 18 GHz N9927 80016 1 Nameplate N9918A 26 5 GHz VNA Nameplate Set N9927 80011 1 Nameplate N9925A 9 GHz N9927 80012 1 Nameplate N9926A 14 GHz N9927 80009 1 Nameplate N9927A 18 GHz N9927 80010 1 Nameplate N9928A 26 5 GHz SA Nameplate Set N9927 80017 1 Nameplate N9935A 9 GHz N9927 80018 1 Nameplate N9936A 14 GHz N9927 80019 1 Nameplate N9937A 18 GHz N9927 80020 1 Nameplate N9938A 26 5 GHz 5 N9912 40006 2 Hole plugs 6 N9910 80002 1 Strap handle 9 W1312 40060 1 Battery door cover 10 1480 0793 4 Dowel pins 12 0515 5153 6 Screw machine w flat washer pan head Torx T10 M3 0 x 0 5 35 mm 1 Each time the FieldFox case is opened for any reason you must order a Repair and Re assembly Kit See Miscellaneous Parts on page 6 13 N9927 90003 6 11 Replaceable Parts FieldFox Analyzer Replac
80. laced Assembly Adjustments etc TME Tests or Other Procedures Main battery None needed None needed RPG None needed Manual check of RPG operation PORT 1 connector or associated cable W1 replaced or disturbed Error Terms adjustment if applicable Error Terms test if applicable PORT 2 connector or associated cable W2 replaced or disturbed Error Terms adjustment if applicable Error Terms test if applicable Absolute Amplitude Accuracy Test Total Abs Amp Accy LF Test Total Abs Amp Accy HF Test Front case including A keypad A2LCD None needed None needed Manual check of keyboard Manual check of LCD A3 front panel interface board None needed Manual check of keyboard Check for even brightness in LCD backlight Check sound A4 RF board All TME based adjustments that apply to the installed option configuration All TME based tests that apply to the installed option configuration A5 System board First load the instrument serial number into the A5 System board All TME based adjustments that apply to the installed option configuration All TME based tests that apply to the installed option configuration A6 SOM board 7 RTC Battery Install firmware from SD card Re install options All TME based adjustments that apply to the installed option configuration None needed Refer to the following manual checks and procedures
81. lease the retention clips on the cable connector and remove the cable from the rear case Figure 7 7 Replacing the Battery Cable Use a small flat blade screwdriver Use a small flat blade screwdriver here to release the connector from here to release the connector from under the retention clip Retention Clips under the retention clip Battery Cable Connector n9912_90003_707 3 When installing the new battery cable make sure that the connector snaps into place 4 Reinstall the rear case onto the front case See Combining the Front and Rear Cases Replacing the Rear Case 1 Separate the front and rear cases See Separating the Front and Rear Cases 2 Carefully remove the serial number label and the Windows CE label from the back of the old rear case and apply the labels to the new rear case 3 Remove the kickstand assembly from the old rear case and install it on the new rear case See Replacing the Kickstand Hinge Cover and Hinge 4 Remove the battery cable from the old case and install it in the new case See Replacing the Battery Cable 5 Install the new rear case onto the front case See Combining the Front and Rear Cases Replacing the Strap Handle 1 Separate the front and rear cases to the positions shown in Figure 7 5 See Separating the Front and Rear Cases 2 Note the orientation of the strap handle then lift it off of the dowel pins at each end 3 Slip the new strap handle over the dowel pins 4 Reinst
82. locate the IF Out SMB m connector Connect one end of a test cable to the IF Out connector on the side of the instrument Connect the other end of the test cable to the functioning spectrum analyzer Tune the functioning spectrum analyzer to 33 75 MHz The Out signal level should measure 33 75 MHz at approximately 16 dBm as illustrated in Figure 4 5 Figure 4 4 33 75 MHz I F Output Test Setup Functioning Spectrum Analyzer Signal Source Figure 4 5 33 75 MHz I F Output Signal Agilent Spectrum Analyzer Swept SA C SENSE INT Center Freq 33 800000 MHz PNO Wide Trig Free Run IFGain Low Atten 6 dB Ref 10 00 dBm Center 33 80 MHz Span 20 00 MHz Res BW 180 kHz VBW 180 kHz Sweep 1 000 ms 1001 pts Since the input attenuator is set to 10 dB there should be 6 dB of conversion loss from the RF input connector to the Out connector 4 12 N9927 90003 Troubleshooting Measurement Group Troubleshooting FieldFox Analyzer NOTE The 1 GHz test signal was set to 0 dBm The input attenuator on the analyzer was set to 10 dB If the A4 Board had 0 dB of conversion loss the 33 75 MHz I F output would measure 10 dBm but it measured 16 dBm because the A4 R F Board has 6 dB of conversion loss If the input attenuator is changed from 10 dB to dB the signal will change by 10 dB to 6 dBm You can verify the input attenuator performance referencing the Table 4 1 Table 4
83. ment SEQUENCE 2 2 RN 7 4 Removal and Replacement Procedures 124545544 PER 7 5 Removing and Replacing the Main a 7 6 Removing aad Replacing the Case Group Parts 7 8 Removing and Replacing the Front Panel Group Assemblies 7 21 Removing and Replacing the Measurement Group Assemblies 7 27 Peet ior Eere EEN pc ee ERS LC E PEE EP Pu 7 44 Manus Checks and ids o bU TEE E 7 45 8 General Purpose Maintenance and Service Procedures in Wis Chapter d eR P 8 2 Related User ODOYABONS ees 8 3 To View Comently Installed pions kageeeneee eas eeeegereneereseeres 8 3 To View the Current Firmware Revision 68440034 540644 40044 0004500805 8 3 To Vie the Erot Lee Peles ee bps eek Oe ee ees 8 3 Te View Temperate Reaves uu deba oo SCR Pu 8 4 brace User Dala denn LERES I
84. mentation symbol The product is marked with this symbol when it is necessary for the user to refer to the instructions in the documentation The CE mark is a registered trademark of the European Community If accompanied by a year it is when the design was proven The CSA mark is a registered trademark of the Canadian Standards Association This is a marking to indicate product compliance with the Canadian Interference Causing Equipment Standard ICES 001 This is a symbol of an Industrial Scientific and Medical Group 1 Class A product This is a required mark signifying compliance with an EMC requirement The C Tick mark is a registered trademark of the Australian Spectrum Management Agency This product complies with the WEEE Directive 2002 96 EC marking requirements The affixed label indicates that you must not discard this electrical electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE Directive Annex I this product is classed as a Monitoring and Control instrumentation product Do not dispose in domestic household waste To return unwanted products contact your local Agilent office or see http www agilent com environment product for more information N9927 90003 FieldFox Analyzer Safety and Regulatory Information Regulatory Information Battery Disposal If the either the primary power battery or the RTC real time clock battery on the A3 fro
85. n Battery Required if the analyzer is returned for service without a battery Refer to Table on page 13 for part numbers USB flash drive Used for firmware upgrades option installation etc Also known as USB memory stick Must be 128 MB or larger Small free standing fan Used to cool the analyzer if internal temperature is too high See DUT Warmup in the Getting Started section of the N7841A help file for usage instructions Generic small office fan of approximately six inches in diameter is sufficient e Cal kit Cal kit compatible with port connectors Mini SD flash card Required to re load firmware onto the A6 SOM board A mini sized Secure Digital SD flash memory card is between standard and micro sizes The memory size must be at least 64 MB and not greater than 2 GB This card is not available from Agilent To identify a supplier search the Web for mini sd card Stereo headphones or ear buds May be used to troubleshoot sound output if there is a problem with the internal speaker N9927 90003 3 5 Tests and Adjustments FieldFox Analyzer Before Returning an Instrument to a Customer Before Returning an Instrument to a Customer When finished servicing an FieldFox analyzer perform the following before returning the unit to the customer Set the Display Colors to Indoor and the display Brightness to 80 via System 7 gt Preferences gt Preferences etc Perform an Opera
86. nerally correct the gain with 11 frequency bands See page 5 11 for a listing of the 11 bands See the TME help file for details on SA adjustments 5 24 N9927 90003 FieldFox Analyzer Theory of Operation Temperature Related Information Power Meter Mode All measurement circuitry is switched to the low power state during PM power meter mode This is the mode with the lowest power dissipation The analyzer has no power output capability in this mode The analyzer essentially functions as a display for a USB power sensor Temperature Related Information Five temperature sensors are in the analyzer two on the A4 RF board two on the A5 System board and one in the battery pack e 1 the A4 RF board e RF2 on the A4 RF board e SBl on the 5 System board e SB2 on the A5 System board Battery pack inside the battery pack The battery pack has its own internal temperature sensor The battery pack will shut itself down in the case of extreme temperatures See Chapter 8 for instructions on viewing temperature readings See the FieldFox Analyzer User s Guide Part Number N9927 90001 FieldFox High Temperature Protection section for information about operation at high temperature During normal operation as each SA measurement is taken the current RF2 temperature reading is compared tot he temperature stored for the Frequency Response adjustment A delta temperature is calculated Each SA measurement is ad
87. nt panel interface board needs to be disposed of dispose of it in accordance with your country s requirements If required you may return the battery to Agilent Technologies for disposal Refer to Contacting Agilent on page 2 9 for assistance DO NOT THROW BATTERIES AWAY BUT COLLECT AS SMALL CHEMICAL WASTE For instructions on removing and replacing the primary power battery refer to Removing and Replacing the Main Battery on page 7 6 For instructions on removing and replacing the RTC real time clock battery located on the A3 front panel interface board refer to Replacing the A3 Front Panel Interface Board FPIB on page 7 25 N9927 90003 1 7 Safety and Regulatory Information FieldFox Analyzer Regulatory Information 1 8 N9927 90003 2 General Product Information N9927 90003 2 1 General Product Information FieldFox Analyzer Information in This Chapter Information in This Chapter Section Title Summary of Content Start Page Cleaning instructions for the external surfaces of your analyzer Maintenance Page 2 2 Information about electrical maintenance of your analyzer Audyssi Models A list of the models available for the microwave Page 2 3 network analyzers A list of the options available for the microwave Page 2 4 network analyzers The Internet address URL for Agilent assistance Service and support options available Agilent Support Services and
88. o calibration available to activate for Cal OFF this measurement 5 26 N9927 90003 FieldFox Analyzer Theory of Operation User Calibration in CAT NA and VVM Modes Mechanical Calibration Mechanical Calibration is performed using discrete standards from a Cal Kit Several Cal Kit definitions are built into the FieldFox Mechanical Cals are extremely accurate when performed using the correct Cal Kits with standards that are clean and in good repair and when using correct connection procedures N9927 90003 5 27 Theory of Operation FieldFox Analyzer Firmware Related Information Firmware Related Information General Description The analyzer is based on the Windows CE operating system This is a closed system no direct user access to the desktop of general operating system functions is provided The file system for Windows CE is maintained in flash memory on the A6 SOM board There is limited access to the file system Most memory is in a protected region and not directly accessible by the user The user accessible memory is under UserData See the File Management section of the FieldFox Analyzer User s Guide Part Number N9927 90001 for instructions on saving recalling and managing files in the unprotected memory User Accessible Files Directory structure below UserData in the A6 SOM board flash memory External USB flash memory plugged in the analyzer External SD memory card plugged int
89. o some extent are interrelated and affect each other s performance The major functional groups are Front Panel Group Measurement Group Front Panel Group The front panel group consists of the following e A2LCD Assembly A3 Front Panel Interface Board Measurement Group The measurement group consists of the following e RF Board A5 System Board A6 SOM Board A7 Real Time Clock Board Main Battery N9927 90003 5 3 Theory of Operation FieldFox Analyzer Analyzer System Operation Figure 5 1 Overall Block Diagram pov A5 SYSTEM BOARD Ref In w3 Trig In ETT A4 RF BOARD i w I X 6 5 J105 REF INPUT i we NAA i 4 LI s 9 11001 wi REF TRIG I REFLECTOMETER gt gt gt PORT 1 ovr i RF Output i i for Analyzer Ri ws i i 8 MW SA IF ouT i instruments i i i i i i i i w Q PORT 2 K i SA RF Input 1 for Analyzer l w PX l amp MWSA l instruments 1 i SPEAKER l i A7 RTC BA RY Left Side Panel a 1 Real Time Clock i i Battery Board USB MICROCONTROLLER ON OFF BUTTON POWER AND LED MANAGEMENT AND ANALOG POWER SUPPLIES BATTERY CHARGER AND MANAGER 7 ROTEN block overall carsonsa 4 11 2013 5 4 N9927 90003 FieldFox Analyzer Theory of Operation Front Panel Group Front Panel
90. o the analyzer NOTE When copying files a Copy directory is created at the root of the destination device as the destination for the copied file s This characteristic generally makes it impossible to copy a file into the desired directory under UserData in the A6 SOM board flash memory This limits the usefulness of copying files to or within UserData Operational Files Results from adjustments performed under TME see Chapter 3 not directly available to user File resulting from CAT NA VVM user calibration not directly available to user Cal kit definition files stored in UserData calkits Cable definition files stored in UserData Cables Error log not directly available to user See Error Log further on in this section for accessing error log information Erase User Data Utility A utility to erase all directories and files in the UserData directory is available After the flash memory is erased the boot process returns the UserData directories and files to the state as shipped from the factory The System Information screen indicates the time and date of the most recent erase See Chapter 8 for instructions on executing the Erase User data utility 1 Windows and Windows CE are U S registered trademarks of Microsoft Corporation 5 28 N9927 90003 FieldFox Analyzer Theory of Operation Firmware Related Information Error Log See Chapter 8 for instructions on viewing the error log T
91. of the instrument e A brief description of why options need to be re installed This information will help Agilent identify recurring problems that may need special attention 2 Within two working days you will receive an email response with a license file attached 3 Copy the license file to the root of a USB flash drive Follow the appropriate instructions in the N9912A Upgrade Installation Instructions N9912 90005 to install the licenses These instructions are available by searching for N9912 90005 on the Web at www agilent com Additional Information About Options For information on acquiring additional options go to www agilent com find fieldfox2 and follow the Upgrades available for FieldFox N9912A link There is an installation note associated with each option upgrade that provides detailed instructions Some combinations of options are not valid see the web information for details N9927 90003 8 5 General Purpose Maintenance and Service Procedures Firmware Upgrades Firmware Upgrades To Check the Current Firmware Revision Press System 7 Press Service Diagnostics Press System Information The current firmware version is indicated on the Firmware Release line FieldFox Analyzer For information on upgrading FieldFox firmware go to www agilent com find fieldfox2 If the firmware upgrade process is interrupted memory contents in the instrument may become corrupted If a problem is sus
92. or the System Monitor circuit 3 3 volt circuit powered from Ext DC or Batt whichever is greater Used on A5 System board only Unreg DC from Ext DC or Batt 21 volts max Ext DC from external Power AC Adapter nominal 15 volts acceptable up to 19 volts e Batt from main battery nominal 12 volts All voltages except Ext DC Batt and the System Monitor power can be turned on off within the analyzer Refer to Power Management Circuitry on page 5 12 for more information 5 18 N9927 90003 FieldFox Analyzer Theory of Operation Grounding and Power Power Control and Management Power States The On Off Button is used to switch between On Off and Standby power states Off Only the System Monitor and battery control circuits are powered up if power is available from the battery or external power If the battery is charging the LED below the On Off Button slowly flashes orange with increasing intensity otherwise this LED is off Some battery power is required in the Off state A fully charged battery will discharge completely in four to six weeks when left in the analyzer On This is normal operation The On Off Button LED is steadily lit green Standby Only the digital power supplies are on The CPU is in a low power state maintaining RAM content The On Off Button LED flashes yellow briefly every two seconds During normal operation unexpectedly disconnecting power to the analyzer such as removing
93. ory of Operation FieldFox Analyzer LAN Interface LAN Interface See the System Configuration section of the FieldFox Analyzer User s Guide Part Number N9927 90001 for details on reviewing and configuring LAN settings The LAN interface supports Auto MDIX When a LAN cable is connected to the FieldFox if the other end of the cable supports Auto MDIX there is no need for a cross over cable There are two LEDs on the LAN connector When there is successful communication over a LAN cable both LEDs are active If both LEDs are not active consider using a cross over cable 5 30 N9927 90003 6 Replaceable Parts N9927 90003 Replaceable Parts Information in This Chapter FieldFox Analyzer Information in This Chapter This chapter identifies the replaceable parts for the FieldFox analyzer includes several tables and illustrations to assist you in identifying the correct part for your analyzer contains ordering information for new assemblies and rebuilt exchange assemblies your analyzer Section Title Summary of Content Start Page Didesni hemi How to order a replaceable part from Agilent Page 6 3 Technologies Breglosnment The correct sequence for determining the failure of and Pus dd replacing a defective assembly Tables with illustrations that list all replaceable parts in bus 6 5 6 2 N9927 90003 FieldFox Analyzer Replaceable Parts
94. ound 1 3 electrostatic discharge See ESD equipment for service 3 5 erase user data utility 5 28 error log 5 28 ESD protection 1 5 3 3 4 3 7 3 supplies part numbers 6 14 F firmware check current revision of 8 6 erase user data utility 5 28 general description 5 28 install from SD card 7 45 operational files 5 28 upgrades 5 28 8 6 5 28 front panel replaceable parts illustrated 6 5 part numbers 6 5 front panel group operation 5 5 troubleshooting 4 7 front panel group assemblies removal and replacement 7 21 front panel interface board illustrated 6 5 operation 5 5 part number 6 5 removal and replacement 7 21 functional groups 5 3 G general safety considerations 1 3 ground safety earth 1 3 grounding operation 5 18 I instruction documentation symbol 1 6 instrument markings 1 6 instrument serial number compare 7 45 load 7 45 ISM1 A mark 1 6 ISO 17025 standards compliant calibration Option 1A7 2 8 K keyboard manual check 7 45 keypad illustrated 6 5 part number 6 5 removal and replacement 7 21 kickstand N9927 90003 Index 1 Index removal and replacement 7 8 L LAN interface general information 5 30 LCD illustrated 6 5 manual check 7 45 operation 5 6 parts list 6 5 removal and replacement 7 21 LCD shield removal and replacement 7 21 lithium battery disposal 1 7 load instrument serial number 7 45 M main battery
95. ow 4 Press NA then press Measure 1 If S22 is not available then skip to step 5 below If 522 is available then continue this step below e Connect a short to Port 2 Press S22 e Displayed trace should be within 4 dB of zero Connect a load to Port 2 e Displayed trace should approximate the value of load typically it will be below 20 dB N9927 90003 3 7 Tests and Adjustments Operational Check 3 8 FieldFox Analyzer Press Mode If SA is available then continue below otherwise the operational check is complete For this step Port 2 should be unconnected or connected to a short or load Press SA The measurement trace should be below the following limits Up to 4 GHz limit 45 dBm Up to 6 5 GHz limit 42 dBm Up to 9 GHz limit 39 dBm Up to 14 GHz limit 33 dBm Up to 18 GHz limit 28 dBm Up to 26 5 GHz limit 18 dBm The general slope of the trace should trend upward A flat trace indicates an uncalibrated condition that requires adjustments If a segment of the trace is offset by more than 10 dBm from the general slope of the trace this indicates a hardware failure that requires service N9927 90003 FieldFox Analyzer Tests and Adjustments Performance Tests Agilent N7841A Software Package Performance Tests Agilent N7841A Software Package The performance tests section of the Agilent N7841A software package verifies the electrical performance of your FieldFox analyzer Th
96. pair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assemblies Figure 7 26 System Shield Torque Pattern system_shield_torque 7 38 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Replacing the RF Assembly Including the A4 RF Board 1 2 Separate the front and rear cases Refer to Separating the Front and Rear Cases on page 7 10 Remove all measurement group assemblies as one unit Refer to Removing All Measurement Group Assemblies as One Unit on page 7 27 Refer to Figure 7 20 Remove cables W1 and W2 Refer to Figure 7 27 Remove the twenty six screws item 2 attaching the RF board shield to the RF board item 1 Refer to Figure 7 28 The RF board can now be removed from the measurement assembly Refer to Figure 7 25 Re connect the A4 RF board to the A5 System board Refer to Figure 7 29 Replace the RF board shield by replacing the twenty six shield screws Torque these nineteen shield screws plus the two System board screws 13 and 21 in the sequence shown by the circled numbers 1 21 Repeat this torque sequence one additional time Torque to 12 in Ibs Refer to Figure 7 20 Make sure the RFI O rings are in the correct position on the RF connectors Perform the steps under Post replacement Procedure on page 7 44 Figure 7 27 Replacing the A4 RF Board 2 26
97. pected consider doing a fresh installation of the firmware Follow the process under Install Firmware from SD Card near the end of Chapter 7 See the Firmware Related Information section of Chapter 5 for details on what happens during the firmware update process 8 6 N9927 90003 FieldFox Analyzer General Purpose Maintenance and Service Procedures Miscellaneous Service and Maintenance Miscellaneous Service and Maintenance Cleaning the Display Materials Use a soft lint free cloth Use a solution with 99 5 IPA isopropyl alcohol or a high quality window cleaning solution Technique Do not rub back and forth with a polishing motion Use a single swipe from the soiled location to the nearest edge of the display Battery Maintenance See the Working with the Lithium Ion Battery section of the FieldFox User s Guide for information on the removable battery In particular see Built In Battery Gauge and Reconditioning the Battery N9927 90003 8 7 General Purpose Maintenance and Service Procedures FieldFox Analyzer Miscellaneous Service and Maintenance 8 8 N9927 90003 Appendix A N9927 90003 Appendix 1 Appendix A FieldFox Analyzer FieldFox S parameter Measurement Uncertainty for System Verification FieldFox S parameter Measurement Uncertainty for System Verification The system verification process validates that the network analyzer test cables and calibration standards are a
98. perature sensors and how the page 5 25 analyzer responds to temperature information gathered User Calibration in CAT NA and Descriptions of one port and two port calibrations for page 5 26 VVM Modes the CAT and NA modes of operation Firmware Related Information Information about firmware and firmware upgrades page 5 28 N9927 90003 FieldFox Analyzer Theory of Operation Analyzer System Operation Analyzer System Operation The FieldFox analyzer is capable of both network analyzer NA and spectrum analyzer SA functions Full two port NA functions are supported by the hardware Model and option combinations determine available functionality SA functions are supported by the hardware on Port 2 Model and option combinations determine available functionality Atemporary CFG option is available to enable full functionality when needed for service operations Details on the CFG option are provided in the N7841A TME help See Figure 5 1 for a simplified block diagram of the overall RF analyzer system All FieldFox analyzers covered by this manual have the same hardware Options to increase functionality are enabled via licenses additional hardware is not required Functional Groups of the Analyzer The operation of the analyzer can be separated into two major functional groups Each group consists of assemblies that perform distinct functions Some of the assemblies are related to more than one group and both groups t
99. placeable Parts Listings Table 6 1 Part Numbers for Miscellaneous Parts and Accessories Continued Number ESD Supplies Adjustable antistatic wrist strap 9300 1367 Antistatic wrist strap grounding cord 5 foot length 9300 0980 Static control table mat and earth ground wire 9300 0797 ESD heel strap 9300 1126 Battery Battery Rechargeable Li Ion 11 1V 4 6A HR 1420 0908 1 Refer to Battery Disposal on page 1 7 for instructions on disposing of the old battery 6 14 N9927 90003 7 Repair and Replacement Procedures N9927 90003 7 1 Repair and Replacement Procedures Information in This Chapter FieldFox Analyzer Information in This Chapter This chapter contains procedures for removing and replacing the major assemblies of your Agilent Technologies FieldFox analyzer Section Title Summary of Content Start Page Personal Safety Warnings Warnings and cautions pertaining to personal safety Page 7 3 Electrostatic Discharge ESD Information pertaining to ESD protection Page 7 3 Protection Assembly Replacement Sequence A step by step procedure for how to identify the Page 7 4 faulty assembly replace it with a new one and re adjust your analyzer when done Table of Removal and Replacement A table of removal and replacement procedures and Page 7 5 Procedures the corresponding page number where they are located Removal and
100. put of the 1st converter Changing the input attenuator value can improve the dynamic range of the instrument and reduce internally generated distortion products When the optional internal preamplifier is turned on the displayed average noise level of the instrument is improved This occurs because the noise figure of the overall system is improved Improving the displayed average noise level of the system enables the user to analyze low level input signals The 1st 2nd and 3rd converters are used to downconvert the input signal to a final I F of 33 75 MHz That is fed to the ADC on the A5 System board This final I F on the output of the ADC can be measured at the IF Out SMB m connector on the side of the instrument Refer to Verifying the 33 75 MHz Output on page 4 11 The frequency bands for the SA circuitry on the RF board are listed below Band Instrument Start Stop 1 0 030 15 000 2 15 000 500 000 3 500 000 1366 250 4 1366 250 2600 000 5 2600 000 3900 000 6 3900 000 7500 000 7 7500 000 9500 000 8 9500 000 12300 000 9 12300 000 15700 000 10 15700 000 16300 000 11 16300 000 19500 000 12 19500 000 23000 000 13 23000 000 23734 000 14 23734 000 25500 000 15 25500 000 26500 000 N9927 90003 5 11 Theory of Operation FieldFox Analyzer Measurement Group Power Management Circuitry The circuitry on the A4 RF board has five special sections that ma
101. r N9927 90003 Title 3 Fieldfox Analyzer The User s Guide included with the product helps you to quickly familiarize yourself with the analyzer Procedures are provided for preparing configuring and making measurements with the analyzer The Quick Reference Guide included with the product is an abbreviated form of the User s Guide containing some of the most commonly referred to information The pages of the Quick Reference Guide are laminated with clear plastic to resist damage when used outdoors Printing Copies of Documentation from the Web To print copies of documentation from the Web download the PDF file from the Agilent web site e Go to www agilent com Enter the document s part number located on the title page in the Search box Click Search Title 4 N9927 90003 Contents 1 Safety and Regulatory Information Inlonmation in This Chapters ccst reroror etaar error CEA OUR TON 1 2 Pr 1 3 General Safety Consideras o oa sess RO ORA HORA Ea RR d Eh 1 3 Salety Earth Ground ESS HERD EERE TEE Re SERED ERS 1 3 Before Applying POWe r recede CP RE 1 4 POCO ci Veh CC eee 1 4 Electtastatic Discharge Luisa 6205 RRR RARE DOERR ESHER 1 5 Repulstory Informatioll 2 be 55s ASRS Oe RAL RE ERO BAS HE VED Ed
102. racking 0 07 dB 0 135 dB 0 32 dB 0 5 dB 10 100 lt 0 5 GHz lt 0 5 GHZ 0 5 to 8 GHz A 0 5 t08 GHz x 8 to 20 GHz n 8 to 20 GHz 30 to 26 5 GHz 20 to 26 5 GHz EL QR E 1 5 3 t Low Mun ES SN 5 01 100 80 60 40 20 0 100 80 60 40 20 0 Transmission magnitude dB Transmission magnitude dB Transmission uncertainty S21 512 10 E 05 GHz e 05 GHz 0 5 to 8 GHz 100 H 05 to 8 GHz B to 20 GHz 8 to 20 GHz amp NS 20 to 26 5 GHz D SS 20 to 26 5 GHz PON NRI w H gt Fal Sn T 3 se a 10 Bia Wis Min pe omen en Qu aaas T mE 01 1 40 35 30 35 20 15 10 5 0 40 35 30 25 15 10 5 0 Reflection magnitude dB Appendix 4 Reflection magnitude dB Reflection uncertainty S11 522 N9927 90003 Index A 1 keypad illustrated 6 5 part number 6 5 removal and replacement 7 8 A2 LCD illustrated 6 5 operation 5 6 part number 6 5 removal and replacement 7 21 A3 front panel interface board illustrated 6 5 operation 5 5 part number 6 5 removal and replacement 7 21 A4 RF board operation 5 7 5 system board operation 5 13 removal and replacement 7 27 A6 SOM board operation 5 17 removal and replacement 7 27 adjustments 3 10 Agilent contacting 2 9 support
103. rement to the vector voltmeter mode available as Option 308 e Tracking capability to the spectrum analyzer independent source available as Option 233 source and spectrum analyzer set to sweep a frequency range in sync N9927 90003 2 5 General Product Information FieldFox Analyzer Analyzer Options Option 211 Vector Network Analyzer Full 2 Port S Parameters For the N991x Combination models of FireFox Option 211 provides transmission reflection or S21 and S11 measurement capabilities along with one port and enhanced response calibrations Additionally for the N991x Combination models and the N992x VNA models Option 211 provides all four S parameters forward and reverse 511 521 12 522 and full 2 port calibration Full 2 port calibration is the most accurate calibration available with FieldFox network analyzers Option 211 also adds A B and B A measurement capabilities to the vector voltmeter mode available as Option 308 e Adds reverse measurements to the e All four S parameters S21 S11 S12 S22 magnitude and phase Option 220 Tracking Generator Full Band Option 220 allows you to easily make accurate scalar stimulus response measurements on active and passive components cables connectors and antennas The full band tracking generator source can also be decoupled to act as a stand alone source that can be used to stimulate an active or passive component optionally using the spectrum analyzer for measuremen
104. rements that test the analyzer to the manufacturer s published specifications It includes both pre and post adjustment data with measurement uncertainty information compliant to the ANSI NCSL 7540 standard This calibration option is available at the time of purchase or can be obtained later by sending your analyzer to Agilent for calibration Refer to Shipping Your Analyzer to Agilent for Service or Repair 2 8 N9927 90003 FieldFox Analyzer General Product Information Agilent Support Services and Assistance Contacting Agilent Assistance with test and measurements needs and information on finding a local Agilent office are available on the Web at http www agilent com find assist If you do not have access to the Internet please contact your Agilent field engineer NOTE In any correspondence or telephone conversation refer to the Agilent product by its model number and full serial number With this information the Agilent representative can determine whether your product is still within its warranty period Shipping Your Analyzer to Agilent for Service or Repair IMPORTANT Agilent Technologies reserves the right to reformat or replace the internal flash drive in your analyzer as part of its repair This will erase all user information stored on the drive It is imperative therefore that you make a backup copy of your critical test data located on the analyzer s flash drive before shipping it to Agilent for repair If you w
105. removal and replacement 7 6 maintenance battery maintenance 8 7 cleaning 2 2 8 7 manual check keyboard 7 45 LCD 7 45 RPG 7 45 manual checks and procedures 7 45 measurement group operation 5 7 troubleshooting 4 9 measurement group assemblies removal and replacement 7 27 miscellaneous replaceable parts part numbers 6 13 N N7841A performance tests 3 9 O operating modes 5 22 CAT and NA 5 24 PM 5 25 SA 5 24 operation A4 RF board 5 7 5 13 5 17 battery 5 17 5 20 CAT and NA modes 5 24 5 17 front panel group 5 5 grounding 5 18 in modes 5 22 LCD 5 6 measurement group 5 7 PM mode 5 25 power 5 18 Index 2 SA mode 5 24 smart power management 5 18 theory of 5 3 operational check 3 7 operational files 5 28 option calibration 2 8 service and support 2 8 Option 1A7 ISO 17025 standards compliant calibration 2 8 Option A6J ANSI Z540 standards compliant calibration 2 8 Option UK6 commercial calibration 2 8 options analyzer 2 4 re installing options 8 5 view currently installed options 8 5 ordering information replaceable parts 6 3 P part numbers documentation 6 13 repair and reassembly kit 6 13 in front panel assembly 6 5 miscellaneous analyzer 6 13 supplies ESD 6 14 tools service 6 13 parts in front panel illustrated 6 5 part numbers 6 5 miscellaneous part numbers 6 13 replaceable listing of 6 5 ordering information 6 3 performance tests N7841A 3 9
106. rightness and Sound on page 4 7 Check Time and Date Check the current time and date Press System gt System Configuration gt More gt Date and Time It may be necessary to adjust the time zone as well See http na tm agilent com fieldfox service rtc_info htm for restrictions and details for setting time and date Re Install Options See the Service Related User Operations section of Chapter 8 for information on re installing options N9927 90003 7 45 Repair and Replacement Procedures FieldFox Analyzer Post Repair Procedures 7 46 N9927 90003 8 General Purpose Maintenance and Service Procedures N9927 90003 8 1 General Purpose Maintenance and Service Procedures Information in This Chapter Information in This Chapter FieldFox Analyzer Section Title Summary of Content Start Page Service Related User Operations How to Page 8 3 e view options currently installed on your analyzer e view the current firmware revision e view the error log view temperature readings erase user data Options How to Page 8 5 view the currently installed options e re install options after repair Firmware Upgrades How to Page 8 6 e check your analyzer s current firmware revision where to locate additional information about firmware upgrades Miscellaneous Service and Information about Page 8 7 Maintenance cleaning the display e battery maintenance 8 2 N9927 90003 F
107. rn loss and DTF 1 port cable loss 2 port insertion loss and CalReady Option 307 GPS Receiver Option 307 enables the built in GPS receiver Requires a GPS antenna such as N9910X 825 Option 308 Vector Voltmeter VVM Option 308 includes S11 or one port cable trimming Option 309 DC Bias Variable Voltage Source Option 309 adds an integrated built in variable voltage DC bias source to the FieldFox analyzer The source provides 1 to 32 VDC with maximum current of 650 mA and 7 watts maximum power The DC bias source can provide DC power to amplifiers under test and bias tower mounted amplifiers TMA when engineers need to sweep through the TMA to reach the antenna The bias tee is available separately The DC output has an SMB m connector Option 310 Built In Power Meter Option 310 provides the functionality to make user definable channel power measurements such as transmitter output power By leveraging InstAlign technology FieldFox is able to make very accurate channel power measurements Option 320 Reflection Measurements Return Loss VSWR and Scalar Measurement Measurement of VSWR and return loss can be made on active and passive devices cables connectors and antennas Option 220 is prerequisite N9927 90003 2 7 General Product Information FieldFox Analyzer Agilent Support Services and Assistance Agilent Support Services and Assistance Information on the following topics is included in this section e S
108. rocedure on page 7 26 Figure 7 15 Replacing the RPG and RPG Knob Disconnect RPG cable here RPG Hex Lock Knob Nut Push RPG knob off of shaft through these holes rpg replace 7 22 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Front Panel Group Assemblies Replacing the A2 LCD the LCD Shield and LCD Cables 1 Perform the steps under Pre replacement Procedure on page 7 21 2 Refer to Figure 7 16 To replace the LCD shield a Remove the four screws item 1 that attach the LCD shield and discard them New screws are provided in the Repair and Re assembly Kit Lift the LCD shield off of the A2 LCD Place the new LCD shield in position on the A2 LCD and secure it with four new screws item 1 These screws are provided in the Repair and Re assembly Kit 3 To replace the LCD cables and the A2 LCD a b g Disconnect the A2 LCD to A3 FPIB cable W13 at the A2 LCD Note the location of the adhesive tape over the connector on the A2 LCD to A5 System board cable W11 Remove the tape and disconnect the cable Remove the A2 LCD from the front case Place the new A2 LCD in position and re connect the cables Place a strip of adhesive tape over the LCD connector end of the A2 LCD to A5 System board cable W11 in the same location as the old strip and as shown A new strip of adhesive tape is provided in the Repair and Re assem
109. ront Panel Group Troubleshoot cine oo REDIERE eR eee Red dea eae E RARE RACER 4 7 Checking Display Brightness and Sound 5 0 0 5 00060 cee eee ee e yeh e 4 7 Checking the Front Panel Keys REPRE EE E PY ERE ERE I EE Rd 4 7 USB and SD Card Slot Pome ic 6h id esd ERES eR EE ROHS OLERES E RE RR 4 8 Measurement Group Troubleshooting cbe RR EORR Eee eRe Ree eee BUR Anu ERARI 4 9 Problems an NA Mode gt eta rasche eer boe Re eek dere abd qd HEH 4 9 Problems in SA Mode correos ioi DR RO RR b be d Ra db S Rb Rd Re da Red ton d qs 4 11 5 Theory of Operation Intonation mi Thus epee I EROR 5 2 5 3 Functional Groups of The 5 3 Froni Panel x Ara ui deu 5 5 AS Front Panel Board RAS PIE REPE dis dE 5 5 osos ese rbxkREOPPPICEROSCKRESCOERqUEKEPEQEbYE GS Edd 5 6 MERTEN adeb batir RETE RR REPRE E Eb dd did ibis 5 7 PARP WOME ci age fi PE 5 7 AS Sve Bas it oui e chiar coed baud ee EP REQUE 5 13 SUMO BS s scepserkbec4rkRRSEAPLUEERQSOME ugs 5 17 AT Real lume Clock Bau ERA EP
110. sembly on the rear case c Place the new hinge cover in position and secure it with four new screws A new hinge cover and new screws are provided in the Repair and Re assembly Kit 3 To replace the hinge cover a Position the new hinge cover in place and install four new screws New screws are provided in the Repair and Re assembly Kit 4 To replace the hinge a Refer to Figure 7 3 Lift the kickstand assembly off of the rear case b Remove and discard the four hinge attachment screws item 2 c Place the new hinge in position and install with four new screws New screws are provided in the Repair and Re assembly Kit d Place the kickstand assembly in place on the rear case and reinstall the hinge cover with new screws provided in the Repair and Re assembly Kit Figure 7 3 Replacing the Hinge 4 places Hinge 2 Kickstand backside n9912 90003 703 N9927 90003 7 9 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Case Group Parts Separating the Front and Rear Cases 1 Remove the battery Refer to Removing and Replacing the Main Battery on page 7 6 2 Refer to Figure 7 4 Loosen the six screws item 3 that secure the RF top panel It should not be necessary to remove these screws just loosen them 3 Remove and discard the six screws item 4 that secure the rear case to the front case New screws are provided in the Repair and Re assembly Kit Fi
111. sponse Adjustment 3 10 N9927 90003 4 Troubleshooting N9927 90003 4 1 Troubleshooting FieldFox Analyzer Information in This Chapter Information in This Chapter The information in this chapter helps you Identify the portion of the analyzer at fault Locate the specific troubleshooting procedure to identify the assembly or peripheral at fault The sections in this chapter are arranged in a logical troubleshooting order The following table lists the sections and a brief summary of what to look for in that section Section Title Summary of Content Start Page Getting Started with Troubleshooting A starting point to begin troubleshooting Page 4 4 Power Up Troubleshooting Power up problems Page 4 6 Problems with the front panel assemblies of the analyzer Does the display appear correct Front Panel Group Troubleshooting e Is the sound working Page 4 7 e Do the front panel keys function properly e Does the front panel USB and SD card connection function properly Problems with the measurement group assemblies Measurement Group Troubleshooting ofthe analyz t Page 4 9 Problems in NA Mode VNA Specific Troubleshooting Page 4 9 e Checking the A B and R2 signals Problems in SA Mode SA Specific Troubleshooting Page 4 11 e Checking source power 4 2 N9927 90003 FieldFox Analyzer Troubleshooting Protect Against Electrostatic Discharge ESD Protect Against
112. t Option 233 Spectrum Analyzer Option 233 adds a high performance full band spectrum analyzer including four traces different detector types radio standard selection and flexible limit lines The option offers channel power measurements AM FM tune and listen field strength measurements antenna factors and frequency counter markers Also included is a full band tracking generator Option 235 Preamplifier for Spectrum Analyzer Option 235 increases the spectrum analyzer sensitivity reducing the DANL to 155 dBm Option 233 is prerequisite Option 236 Interface Analyzer and Spectrogram Option 236 provides quick and accurate identification of interfering signals using the spectrogram or waterfall display Record and playback allows signal capture and offline processing Option 233 is prerequisite Option 238 Spectrum Analyzer Time Gating Adds FFT e Gate sources External RF Burst and Video Option 233 is a prerequisite for Option 238 2 6 N9927 90003 FieldFox Analyzer General Product Information Analyzer Options Option 302 External USB Power Sensor Support Option 302 allows the use of an external USB controllable power sensor All Agilent U2000x Series USB power sensors are supported with FieldFox Visit www agilent com find u2000 for an up to date listing Option 305 Cable and Antenna Analyzer Option 305 provides fast and accurate diagnosis of cables connectors and antennas with DTF dB linear VSWR retu
113. t screws See Figure 7 9 9 Reinstall the measurement group assemblies RF top panel assembly A4 RF board A5 System board and A6 SOM board as one unit with the new I O panel attached 10 Reinstall the rear case onto the front case See Combining the Front and Rear Cases 7 16 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Case Group Parts Replacing the Front Case including the A1 Keypad l 2 Separate the front and rear cases See Separating the Front and Rear Cases Remove the measurement group assemblies RF top panel assembly A4 RF board A5 System board and A6 SOM board as one unit with the I O panel attached Refer to Removing and Replacing the Measurement Group Assemblies on page 7 27 Remove the front panel group assemblies A2 LCD A3 front panel interface board and RPG Refer to Removing and Replacing the Front Panel Group Assemblies on page 7 21 Figure 7 11 X Replacing the Front Case Model Number Nameplate Overlay 6 Hole Plug front view n9912 90003 710 Carefully remove the serial number label from the inside bottom of the old front case and apply the label to the new front case Refer to Figure 7 11 Choose the appropriate model number nameplate overlay for your analyzer remove the protective backing to expose the adhesive and adhere it in the location shown Remove the dowel pins item 5 from t
114. tails Erase User Data Utility Press System 7 Press Service Diagnostics e Press Advanced Press Erase User Data Press Confirm Erase The UserData memory portion is erased then the instrument restarts See the Firmware Related Information section of Chapter 5 for details on the Erase User Data utility 8 4 N9927 90003 FieldFox Analyzer General Purpose Maintenance and Service Procedures Options Options Installed options determine the functionality of the analyzer There is a license associated with each option To View Currently Installed Options Press System 7 Press System Configuration Press Options Press Show Options A list of the currently installed options is displayed Re Installing Options If an instrument looses all of its options i e it reports or shows no options the only functionality available will be the base mode for the model When the A6 SOM board is replaced it is necessary to re load the license files because the license and option information is stored on the A6 SOM board Process for obtaining and re installing options 1 Send an email to ctd soco_support agilent com with the following information Indicate that you need previously issued licensed for a FieldFox repair Model number and serial number of the instrument Maximum frequency of the instrument from the label above the display Alist of options from the serial number label on the back
115. tandard Option 210 Standard Format NA 511 S21 S12 S22 Log Mag Measure Option 210 Option 211 Standard Calibration Output Power Port NA Settings High Low Extensions Meas Setup Standard Standard Standard Standard Standard Option 010 5 22 N9927 90003 FieldFox Analyzer Theory of Operation Operation in Modes Response Mechanical CAT or Cal QuickCal Cal Cal OFF ON View Cal NA Cal Standard Option 112 Standard Standard Standard ps Cable 2 Port AIB VVM rimming ransmission Measure Option 308 OPtion 308 amp Option 308 Option 308 amp P 210 amp 210 amp 211 210 amp 211 Radio Channel Tune amp Interference Source Standard Measurements Listen Analysis SA Measure Option 233 Option 233 Option233 Option 236 ae a amp Source Mode Normalize Power Source CW OFF ON CW OFF ON Freq SA Source Source Mode Source Mode Source Mode Tracking CW Coupled CW STE oponas Standard Standard amp 210 ee Autoscale Unit dBm Corrections External Gain Pease Standard Standard Standard Standard Option 235 Trace Record Recorder SA Trace 1234 State Clr Wr Default Detector Auto Playback Setup Player Standard Standard Standard Standard Option 236 Option 236 For a given mode the analyzer remembers the most recent state of the current mode when you change to another mode
116. ted via the common shields at multiple points The ground plane on the A3 Front Panel Interface board is connected to the ground plane on the A5 System board There are no separate grounds in the analyzer There is no star ground point in the analyzer Batt Neg and Ext DC neg are connected to the A5 System board ground plane The A2 LCD assembly has two separate grounding circuits the LCD power and control circuits and the backlight LED s The LCD power and control circuits share a ground that is connected to the ground plane on the A5 System board The ground for the backlight LED s is connected to the ground plane on the A3 Front Panel Interface board Voltages and Power Supplies The following power supplies exist within the analyzer Digital 5 volts generated from Unreg DC on the A3 Front Panel Interface board controlled by the System Monitor on the A5 System board and used on the A3 A4 and A5 boards Digital 3 3 volts generated from Unreg DC on the A3 Front Panel Interface board on off functions controlled by the System Monitor on the A5 System board and used on the A2 LCD assembly and A3 A4 A5 and A6 boards Analog supply voltages seven separate voltages generated from Unreg DC on the A5 System board on off functions controlled by the System Monitor on the A5 System board LCD backlight voltage generated on the A3 Front Panel Interface board from the digital 5 volt supply voltage e Power f
117. the power cord The mains plug shall only be inserted in a socket outlet provided with a protective earth contact Any interruption of the protective conductor inside or outside of the instrument will make the instrument dangerous Intentional interruption is prohibited Always use the three prong AC power cord supplied with this product Failure to ensure adequate grounding by not using this cord may cause product damage 1 3 Safety and Regulatory Information FieldFox Analyzer General Safety Considerations Before Applying Power WARNING CAUTION CAUTION Servicing WARNING WARNING WARNING WARNING If this product is not used as specified the protection provided by the equipment could be impaired This product must be used in a normal condition in which all means for protection are intact only This product is designed for use in Installation Category II and Pollution Degree 2 per IEC 61010 1 2001 and 664 respectively The measuring terminals on this instrument are designed to be used with external signals described in Measurement Category I but NOT with external signals described in Categories II and IV The input of this instrument cannot be connected to the mains These servicing instructions are for use by qualified personnel only To avoid electrical shock do not perform any servicing unless you are qualified to do so Danger of explosion if battery is incorrectly replaced Replace only with the same
118. the screen come directly from the battery via the Smart Batt Bus Only the first three items are influenced by the analyzer 5 20 N9927 90003 FieldFox Analyzer Theory of Operation Grounding and Power Battery Charging Management The battery pack determines when the battery needs charging and requests a charge over the Smart Batt Bus The Battery Charger and Manager circuit on the A5 System board responds by charging the battery if there is sufficient voltage on the Ext DC line A minimum of approximately 15 volts is required to charge the battery The System Monitor on the A5 System board monitors the battery s temperature and if too high or too low disables charging of the battery How to tell if the battery is charging Ifthe analyzer is On the lightening bolt is displayed in the battery icon Ifthe analyzer is Off the LED below the On Off Button slowly flashes orange with increasing intensity Ifthe analyzer is in Standby turn the analyzer on and observe the battery icon The battery charges much faster up to 70 of its full charge than it does above 70 of full charge Battery Life When a battery is new an instrument should operate for about four hours on a fully charged battery The actual time will depend on operating mode and temperature As a battery goes through charge discharge cycles its capacity will decrease A typical battery will have more than 70 of its initial capacity after 200 full discharge cycl
119. they are combined Reconnect the System board to front panel interface board cable at the front panel interface board connector as shown 7 42 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7 30 Replacing All Measurement Group Assemblies as One Unit 9 Eo B i PT DEDE CT 184 ai TA val TO Reconnect cable W11 here VO Side Panel B and secure with adhesive tape gt Tuck cable W11 in between LCD shield and 5 System board goes between the speaker side panel I O Side Panel Reconnect cable W14 to A3 front panel interface board here M meas group replace N9927 90003 7 43 Repair and Replacement Procedures Post Repair Procedures FieldFox Analyzer Post replacement Procedure 1 Reinstall the measurement group assemblies into the front case Refer to Reinstalling All Measurement Group Assemblies as One Unit on page 7 42 2 Combine the front and rear cases Refer to Combining the Front and Rear Cases on page 7 18 Post Repair Procedures After the replacement of an assembly you must perform the service procedures in the order listed in Table 7 2 Procedures referenced in this table are located in Chapter 3 Tests and Adjustments unless specified otherwise Table 7 2 Related Service Procedures Rep
120. tional Check as described in the following section Connect and disconnect the external battery charger while the FieldFox is operating and confirm that the power cord icon is displayed appropriately at the top of the display Charge the battery to 80 or higher Press System gt System Configuration gt More gt Date and Time See http na tm agilent com fieldfox service rtc_info htm for restrictions and details for setting time and date 3 6 N9927 90003 FieldFox Analyzer Tests and Adjustments Operational Check Operational Check This operational check exercises only very basic measurement functionality Required Equipment A short compatible with the port connector type on the FieldFox A load compatible with the port connector type on the FieldFox Both are typically available in a compatible cal kit Procedure 1 Press Preset gt Preset Factory The top left corner of the FieldFox display indicates the active measurement type following the preset 2 If the active measurement is SA then skip to step 5 below If the active measurement is S11 or CAT then complete this step below Connect a short to Port 1 e Displayed trace should be within 4 dB of zero Connect a load to Port 1 e Displayed trace should approximate the value of load typically it will be below 20 dB 20 dB for CAT mode 3 Press Mode If NA is not available skip to step 5 below If NA is available then continue at step 4 bel
121. tor plugs tethered caps back into the type N RF connectors to protect the connectors 10 Perform the steps under Post replacement Procedure on page 7 44 Figure 7 19 Replacing the RF Top Panel Assembly Connector Plug SMA Connectors RF Top Tethered cap Nuts and Washers Panel 1 Cable W4 Cable W3 6 places top replace N9927 90003 7 29 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assemblies Replacing the Type N RF Connectors and RF Cables 1 2 10 11 12 13 14 Separate the front and rear cases See Separating the Front and Rear Cases on page 7 10 Remove all measurement group assemblies as one unit Refer to Removing All Measurement Group Assemblies as One Unit on page 7 27 Remove the RF top assembly Refer to Replacing the RF Top Panel Assembly on page 7 29 Refer to Figure 7 20 Disconnect the cable connector nut on cable W1 or W2 depending on which connector or cable is being replaced Do not attempt to remove the cable just release the connector nut Remove the two screws item 2 from the type N RF connector to be replaced Lift the type N RF connector upwards and out of the RF bottom shield The RF input cable can now be replaced by disconnecting the other end of the cable and removing it When installing the new cable do not tighten either of the cable connector nuts until both of them have been installed finger tight
122. tructions 3 Refer to Figure 7 12 Position the front and rear cases side by side as shown 4 Plug the battery cable W15 into the A5 System board as indicated Figure 7 12 Combining the Front and Rear Cases 1 Side Panel Speaker Side Panel case_combine_1 Plug battery cable here Battery Cable W15 7 18 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Case Group Parts 5 Refer to Figure 7 13 Position the rear case on top of the front case and to one side as shown 6 Place the speaker side panel in the groove in the front case being careful not to damage the gasket 7 Position the strap handle over the two dowel pins as shown Figure 7 13 Combining the Front and Rear Cases 2 Dowel Pin 2 places Install new gasket in groove in blank side panel Strap Handle Speaker Side Panel case_combine_2 N9927 90003 7 19 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Case Group Parts 8 Position the rear case directly over and aligned with the front case and the side panels as shown 9 Make sure the battery cable is tucked in between the measurement group assemblies and the speaker side panel and that it is not in the path of the screw hole indicated 10 Firmly press the cases together being careful not to damage the gaskets 11 Install six new screws item 7 to secure the rear case to the front case These new s
123. tting The Pre amp can be in or out Nominal gain of the pre amp is 22 dB The Attn and PA indicators in the display header give current status The Scale Amptd hard key provides access to control for them The displayed measured value for a given signal is automatically compensated for in the current Attn and PA settings For instance if an incoming signal is measured at 70 dBm with the RF IN Atten set to 5 dB and PA out changing to PA in will give a measured value of approximately 70 because the 22 dB for the PA is only nominal The difference seen in the trace will be that the noise floor of the trace will be lowered by approximately 22 dB If the RF In Atten is changed from 5 dB to 15 dB the measured value will not change significantly still approximately 70 dBm but the noise floor will raise by 10 dB SA has two basic modes step and FFT Step mode reads a narrow slice of the spectrum and the LO steps for each slice In this mode a trace on the display is composed from multiple slices Generally spans greater than 100 kHz operate in step mode FFT mode reads a wide slice of the spectrum and the LO is fixed In this mode a trace on the display is based on a single LO setting The LO minimum step size is 2 MHz this restriction limits spurs The hardware operation of the A D s is essentially the same for both step and FFT modes The difference is the digital signal processing The SA adjustments ge
124. ue sequence indicated by the circled numbers 1 2 3 4 in the illustration 12 Refer to Figure 7 26 Place the System shield onto the System board by aligning the dowel pins Replace the nineteen shield screws Torque these screws plus the two System board screws 13 and 21 in the sequence shown by the circled numbers 1 21 Repeat this torque sequence one additional time Torque to 12 in lbs 13 Place the RTC board onto the System board shield and secure with the two screws Torque to 9 in lbs 14 Remove the System board to FPIB cable W14 from the old A5 System board and install it on the new board 15 Reinstall the I O side panel Refer to Replacing the I O Side Panel Doors and Gasket on page 7 14 16 Perform the steps under Post replacement Procedure on page 7 44 N9927 90003 7 35 Repair and Replacement Procedures FieldFox Analyzer Removing and Replacing the Measurement Group Assemblies Figure 7 24 Replacing the A5 System Board Make sure the bullets systembd_replace are straight up when connecting the System and RF boards 7 36 N9927 90003 FieldFox Analyzer Repair and Replacement Procedures Removing and Replacing the Measurement Group Assemblies Figure 7 25 Connecting the System Board and the RF Board A C LS X Hun Make sure the bullets are straight up when connecting the System and RF boards systembd zoom N9927 90003 7 37 Re
125. unit Refer to Removing All Measurement Group Assemblies as One Unit on page 7 27 3 Remove the I O side panel Refer to Replacing the I O Side Panel Doors and Gasket on page 7 14 4 Disconnect cable W3 and W4 from the A5 System board 5 Refer to Figure 7 22 Remove the RTC board Refer to Replacing the Real Time Clock RTC Battery Located on the A5 System Board Shield on page 7 31 6 Remove the System board shield by removing the nineteen screws item 2 Discard the screws new ones are provided in the Repair and Re assembly Kit 7 Referto Figure 7 23 Remove the four screws item 2 that secure the A6 SOM board item 1 to the 5 System board Discard these screws new ones are provided in the Repair and Re assembly Kit 8 Unplug the A6 SOM board from the A5 System board 9 Refer to Figure 7 24 Remove the two screws item 1 from the A5 System board lift it up from the RF bottom shield and unplug it from the A4 RF board connector Discard the screws new ones are provided in the Repair and Re assembly Kit 10 Refer to Figure 7 25 Plug in the new A5 System board to the A4 RF board over the new gasket and aligned with the three dowel pins in the RF bottom shield Make sure the bullets are straight up when connecting the System and RF boards 11 Refer to Figure 7 23 Replace the SOM board onto the System board Install four new screws item 2 from the Repair and Re assembly Kit and tighten them in the torq
126. y be powered down for the purpose of power management These sections may be selectively powered down via load switching when not required for the current operating mode of the analyzer The sections that may be selectively powered down are e Source most of the source synthesizer circuitry e LO most of the LO synthesizer circuitry e SA most of the first second and third converter circuitry Reflectometer put into a low power state e High Band Pre amp high band section of the pre amp turned off The load switching for the Source and LO sections is accomplished on the A5 System board via the Analog Linear Regulators and Load Switching circuitry The load switching for the Reflectometer and High Band Preamp is accomplished on the A4 RF board Other Circuitry The FPGA Field Programmable Gate Array communicates with the FPGA on the A5 System board via FPGA Serial Bus It provides the digital control for the functions on the A4 RF board It also reads the VCO unlock signals RF Serial Bus allows the System Monitor on the A5 System board to read a temperature sensor and the ID EPROM for the A4 RF board 5 12 N9927 90003 FieldFox Analyzer Theory of Operation Measurement Group A5 System Board The A5 System board controls all of the functions of the analyzer and digitizes the RF IF signals NA R NA A NA B and SA IF from the A4 RF board The A6 SOM System on Module board is mounted directly on the A5 System bo
127. zer Replaceable Parts Replaceable Parts Listings Reference Designator Part Number Qty Description 10 0515 1035 4 Screw machine flat head Torx T10 M3 0 x 0 5 8 mm used for 3 5 mm connectors 11 N9912 20033 2 Insulator w pad 12 N9927 20064 2 EMI ring 14 0515 1946 2 Screw machine flat head Torx T10 M3 0 x 0 5 6 mm 15 1420 0905 1 Battery Lithium ion For Real Time Clock RTC backup 16 N9927 60113 1 25 System board top shield 1 Recommended to also order N9927 60133 System Top Shield Assembly N9927 90003 6 9 Replaceable Parts FieldFox Analyzer Replaceable Parts Listings Figure 6 3 Measurement Group Exploded View 2 places 1 i 6 places 2 1 2 places 3 W3 8 2 places e 9 2 places 2 places 11 eU 10 4 places lii nt w2 22 26 places 2 places 12 are 13 21 places 15 16 14 2 places x meas 6 10 N9927 90003 FieldFox Analyzer Replaceable Parts Replaceable Parts Listings Case Group Reference Designator Part Number Qty Description Replacement Assemblies Front Enclosure Assembly Includes 2 Front case W1312 40049 with A1 keypad installed 2 ae 3 LCD lens filter 4 Keypad overlay N9912 80005 Left Si Panel bly Includes 7 N9927 60119 1 eft Side I O Panel Assembly Includes Speaker Right Side I O Pane

Service Guide: Keysight (Agilent) FieldFox MW VNA/SA

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