HP 4349B Resistance Meter Service Manual
Contents
1. BO OS P iO os e O 75 q AA LBS08005 Reference Agilent Part Qty Description Designation Number 1 04339 61614 1 Wire Assy Binding Post 2 04349 61605 1 Cable Assembly 4 04349 24003 1 Sleeve 0890 0312 25 mm Tube Heat Shrink 3 04349 61606 1 Cable Assembly 3 04349 24003 1 Sleeve 0890 0312 25 mm Tube Heat Shrink 4 04349 61607 1 Cable Assembly 2 04349 24003 1 Sleeve 0890 0312 25 mm Tube Heat Shrink 5 04349 61608 1 Cable Assembly 1 04349 24003 1 Sleeve 0890 0312 25 mm Tube Heat Shrink 1 Std Only 3 8 Assembly Replacement Disassembly Procedures This section provides the procedures to disassemble the 4349B major assemblies Tools and fasteners required for the replacement are described Caution SUSCEPTIBLE TO DAMAGE FROM ESD Perform the following procedures only at a static safety workstation and wear a grounding strap Tools and Fasteners The 4349B mechanical components are secured using metric threaded fasteners Many fasteners in the 4349B may appear to be Phillips type but they are in fact Pozidrive type To avoid damaging them use only pozidrive screwdrivers to remove or tighten pozidrive type fasteners Cover Removal The following proced2. 0000000000000 00000000000000 Oo QOOO000 DOO 0000000 LBS04008 Figure 4 8 DC DC Converter Output Voltage Check Table 4 1 DC DC Converter Output Voltages Connected Test Pin Test Pin Range 11 15 5 1 0 2 V 13 15 12 0 6 V 14 15 12 0 6 V Troubleshooting 4 11 Check 2 LCD Displays Anything 1 Turn off the 4349B 2 Turn on the 4349B while watching the LCD 3 Check for a beep sound for a moment and if you see anything is displayed on the LCD 4 If beep sounds and LCD displays something proceed to Check 3 LCD Operates Correctly otherwise proceed to Check 6 CPU Power LED Lights Check 3 LCD Operates Correctly 1 Turn on the 4349B 2 Reset the 4349B 3 Check if the LCD s back light is lit 4 Press some front panel keys such as Meas Prmtr and check if the characters are correctly displayed in the whole area of the LCD 5 If the LCD operates correctly proceed to Check 4 Any Error Message on LCD otherwise replace the LCD Assembly Check 4 Any Error Message on LCD 1 Turn off the 4349B 2 Turn on the 4349B while watching the LCD 3 Check if the LCD displays
3. LBS04016 Figure 4 13 Transformer Secondary Voltage Check Troubleshooting 4 17 Manual Changes Introduction This appendix contains the information required to adapt this manual to earlier versions or configurations of the 4349B than the current printing date of this manual The information in this manual applies directly to 4349B 4 Channel High Resistance Meter whose serial number prefix is listed on the title page of this manual Manual Changes To adapt this manual to your 4349B refer to Table A 1 and make all of the manual changes listed opposite your instrument s serial number Instruments manufactured after the printing of this manual may be different from those documented in this manual Later instrument versions will be documented in a manual changes supplement that will accompany the manual shipped with that instrument If your instrument serial number is not listed on the title page of this manual or in Table A 1 it may be documented in a yellow MANUAL CHANGES supplement For additional information on serial number coverage refer to 4349B Operation manual Table A 1 Manual Changes by Serial Number Serial Prefix Make Manual Changes or Number There are no earlier configurations than the printing date of this manual Manual Changes A 1 Default Jumper and Switch Settings Introduction This appendix describes the setting of the ju
4. The ac line power is connected to the A5 AC Inlet Board Assembly which consists of a fuse line switch and varistors The voltage selection switch selects the ac line voltage from 230V or 115V According to the selection the ac line power is connected to the corresponding primary tap of the transformer Varistor VR1 protects the circuit from surge voltage on the line power VR2 blows fuse F1 if the 4349B is turned on with the wrong line voltage setting selection for example 115V selection when using a 230V line The transformer secondary voltage is approximately 14 V This ac voltage is rectified and filtered by circuitry on the Al Main Board Assembly and produces approximately 14 Vdc The de voltage is applied to the DC DC Converter to produce regulated 5V 12V and 12 Vdc The dc voltages are supplied to all the assemblies either directly or indirectly via the Al assembly 4 8 Troubleshooting Troubleshooting Figure 4 7 shows the overall troubleshooting flowchart to find the defective assembly Follow the flowchart when troubleshooting Refer to the Check Procedure References for detailed procedure to check each item Refer to Chapter 3 for assembly replacement Note Because of each assembly s high SMD surface mount device ratio the repair i should be done by assembly replacement The troubleshooting procedure 9 therefore only isolates the defective assembly
5. Power On U LES04009 Figure 4 9 CPU Board Assembly LED Light Sequence Troubleshooting 4 13 Check 8 CPU Fuse High Lead Voltage 1 Turn on the 4349B 2 Using a multimeter check if the dc voltage at the high lead of the fuse F1 on the CPU Board shown in Figure 4 10 is 5 0 2 V 3 If the voltage is in the range replace the A2 CPU Board Assembly otherwise replace the Al Main Board Assembly Note If the multimeter reading is correct fuse F1 on the A2 CPU Board Assembly is i most suspicious Replacing only the fuse may fix the problem w Note When replacing the A2 CPU Board Assembly refer to Replacing the A2 CPU i Board Assembly in Chapter 3 for handling the ROM and EEPROM on the A2 9 Assembly A2 CPU Board Assy LCS04010 Figure 4 10 Location of High Lead of A2F1 Fuse Check 9 Fuse and Line Switch 1 Check that the fuse on the 4349B rear panel is not blown 2 Check that the line switch on the A5 AC Inlet Board Assembly is not defective 3 If passed proceed to Check 10 DC DC Converter Input Voltage otherwise replace the defective line switch or blown fuse 4 14 Troubleshooting
6. 3 1 Restored Exchange Assemblies AA 3 1 Replacing the A2 CPU Board Assembly AA 3 2 Replaceable Assembly List AA 3 2 Replaceable Mechanical Parts List 3 5 Disassembly Procedures LU 3 9 Tools and Fasteners a l l L4 s 3 9 Cover Removal 2 1 1 1 5252555255 oss 3 9 Al Main Board Removal 4 4 l l a 3 10 Removal Procedure 1 1 1 a 3 10 A2 CPU Board Assembly Removal GU 3 10 Removal Procedure 1 1 1 a 3 10 Contents 1 Ab AC Inlet Board Assembly Removal 3 10 Removal Procedure Xu 3 10 Keyboard Assembly Removal 3 10 Removal Procedure 2 2 2 2 252 2 2525 2 2525 2 5 5 3 10 LCD Assembly Removal 9 11 Removal Procedure LG 3 11 Triaxial Connector Removal 2 2 2 2 2 25 2 2 5 2 52 2 3 12 Removal Procedure 1 De A 3 12 4 Troubleshooting Introduction 2 2 2 ll s s s a 4 1 Safety Considerations ll 4 4 4 a 4 1 Required Equipment 4 1 After Service Product Safety Checks AA 4 2 Theory of Operation 4 3 Overall Measurement Theory CC 0X 4 3 Overall Block Diagram 4 4 Analog Section Co Qu 4 4 I V Converter 4 2 ll l4 UA 4 6 Digital Section 4 4n 4 7 Power Supply Section 2 2 s
7. 4 11 DC DC Converter Open Output Voltages 2 l l en 4 16 Manual Changes by Serial Number 2 2 2 2 2 25 25 A 1 Contents 3 General Information Introduction This chapter provides information on instruments covered by this manual and required equipment for adjustments and troubleshooting Instruments Covered by This Manual Agilent Technologies uses a two section nine character serial number which is printed on the serial number label Figure 1 1 attached to the instrument s rear panel The first five characters are the serial prefix and the last five digits are the suffix Agilent Technologies Japan Ltd SER NO JP1KG12345 AK MADE IN JAPAN 33 Figure 1 1 Serial Number Label An instrument manufactured after the printing date of this manual may have a serial number prefix that is not listed on the title page This unlisted serial number prefix indicates the instrument is different from those described in this manual The manual for this new instrument may be accompanied by a yellow Manual Changes supplement or have a different manual part number This sheet contains change information that explains how to adapt the manual to the newer instrument In addition to change information the supplement may contain information for correcting errors Errata in the manual To keep this manual as current and accurate as possible Agilent Technologi
8. Y Y For HP 4349A without Opt 001 only Figure 2 1 Adjustment Program Flow defines the standards calibration values Update the calibration values as necessary obtains all the channel 1 related data such as input resistance and scaling This item should be performed if the performance test fails on this channel performs the same as the Channel 1 Adjustment for the channel 2 performs the same as the Channel 1 Adjustment for the channel 3 performs the same as the Channel 1 Adjustment for the chamnel 4 writes the adjustment data which is stored in a unit serial number dependent file to the EEPROM Only the adjustment data of previously adjusted channel s will be written Adjustments 2 3 Note Make sure that the correct line frequency 50 or 60Hz has been selected in the i UUT 4349B window preceding the Main Menu This selection will improve 9 the adjustment data accuracy Program Installation The adjustment program must be installed in the computer using the following procedures The installation can be divided into two stages Making a Working Copy and Defining the Configuration Making a Working Copy Copy the contents of the adjustment program disk to a working disk or to the harddisk to prevent accidental deletion or destruction of the program files Use the working disk or the harddisk and store the original disk in a safe place Defining the Configura
9. gau Good Reference Agilent Part Qty Description Designation Number 1 2110 1123 1 A2F1 Fuse SMT2 A 2 1818 5146 1 A2U1 EEPROM 3 04349 85031 1 A2U11 ROM Rev 1 00 Table 3 3 Replaceable Assembly List Reference Agilent Part Qty Description Designation Number A1C500 0180 4334 1 Capacitor 22000 F for power supply A1C501 0180 4334 1 Capacitor 22000 F for power supply A5SW1 3101 3173 1 Line Switch A5SW2 3101 3156 1 Voltage Selection Switch ABVRI 0837 0237 1 Varistor A5VR2 0837 0237 1 Varistor 3 4 Assembly Replacement Replaceable Mechanical Parts List The replaceable mechanical parts are listed in Table 3 4 to Table 3 7 Table 3 4 Replaceable Mechanical Parts List 1 43498 4 CHANNEL HIGH RESISTANCE METER gaelaoeog E3 amp 3 O OO 2 588868 goog eoh LTS Pa LBS03102 mn Jj Reference Agilent Part Qty Description Designation Number 1 04339 04004 1 Cover 0363 0125 30mm x 2 Gasket 2 5041 9167 4 Foot 1460 1345 2 Tilt Stand 3 04349 65020 1 Front Panel Assembly stay 04349 65021 1 Front Panael Assembly Opt 001 4 5041 9170 2 Trim Side 0515 0914 4 Screw M3 Hidden 04263 40001 1 Front Bezel2 04349 00606 1 Sub Pan
10. Troubleshooting 4 9 peorjdel eq o Ajquessy A A1epuooes Jeun0Jsue4 es ob 49942 ei GA indui Auot 20 09 sse Auoo 90 90 UIEIN LV LA peel ysy esny ndo 8 x29u5 SA jndino uedo LL 994 1914eAUOO 20 2 DS OL 428YD ssed EMOIIMS eui pue esna Wa 6 38YO A indino yes Auoo 20 24 4 cobessou 10418 peje e4 Add G YISYD UTIN Iv 6001 uen iv 643 uo epoo 10119 AUY uo eDesseul 104149 AUY 4 49349 y 98YO sok subi EA 0E1109 aan amon seje1edo qo 9 Y99490 Y99490 6ulyjyAue skeldsip 101 amp HISYD ssed W294 LYVLS LBS04007 Figure 4 7 Troubleshooting Flow 4 10 Troubleshooting Check Procedure References Refer to the corresponding check procedure Each check procedure is numbered the same as in Figure 4 7 for quick reference Check 1 DC DC Converter Output Voltage 1 Remove the cover referring to Cover Removal in Chapter 3 2 Turn on the 4349B 3 Using a multimeter check to see if the voltages between the test pins TPs shown in Table 4 1 on Al Main Board Assembly are in the ranges shown in Table 4 1 4 If passed proceed to Check 2 LCD Displays Anything otherwise proceed to Check 9 Fuse and Line Switch
11. V I R r In the current measurement mode the 4349B displays the actual current I for the measurement result For example if R 100 kQ and V 1 V the measurement result will be 9 9 wA x 7 5 rather than 10 iiA 7555 In the resistance measurement mode on the other hand the 4349B displays the derived DUT resistance which coincides with the DUT resistance In other words the 4349B shows the resistance calculated by Re Tr For example if R 100 kQ and V 1 V the measurement result will be 100 kQ even the actual current flowing through the DUT thus through the ammeter with r is 9 9 pA Troubleshooting 4 3 Overall Block Diagram Figure 4 2 shows the overall block diagram of the 4349B I V Converter x 4 Keyboard Measurement V Voltage Vi Demultiplexer Vo s ees LES04002 Figure 4 2 4349B Overall Block Diagram The 4349B has four channel inputs or two channel inputs for Option 001 Each I V converter which is directly connected to an input connector converts the current to a voltage ramp of which slope is proportional to the input current A demultiplexer selects the channel to be measured and passes the voltage ramp to the analog to digital converter ADC The CPU calculates the current from the voltage ramp slope then calculates the DUT resistance by dividing the
12. al 9 Supply Equipment DCV Calibrator 3245A Multimeter 3458A RC Box 16340A Dual Banana BNC m Cable PN 11001 60001 Triaxial Tee m f f Adapter PN 1250 1551 Setup 1 2 This setup obtains the I V Converter scaling factors 43498 Compute laojpopa O0000 0000 Triaxial Cable 16340A furnishied 16340A Top View Triax lee Adapter N BNC Cable 16340A furnished TT Triax BNC Adapter 16340A furnished Figure 2 4 Channel 1 Adjustment Setup 1 2 using DCV Calibrator Perform the following steps as the program instructs 1 Connect the 16340A furnished Triaxial Cable to the 4349B Ch 1 connector 2 Connect the other end of the Triaxial Cable to the Triaxial Tee Adapter f 210 Adjustments 3 Connect the 16340A furnished Triaxial BNC f Adapter with to the Triaxial Tee Adapter f 4 Connect the Triaxial Tee Adapter m directly to the 16340A s 10 10 triaxial connector 5 Connect the 16340A s 10 10 BNC connector to the calibrator dc voltage output using the 16340A furnished BNC cable and appropriate adapter Setup 2 2 This setup obtains the I V Converter input resistance data and the I V Converter scaling factors Compute a 90000 o D00000000 J J Tria
13. Hi CO p2 LBS03004 Reference Agilent Part Qty Description Designation Number 1 0515 1550 4 Screw M3 for A5 2 0515 2079 1 Screw M4 on the Chassis 3 04263 24002 2 Nut Rod for DC DC Conv 2190 0584 2 Washer Spring M3 4 0515 1550 10 Screw M3 for Al and A2 04339 24006 4 Standoff Hidden for A1 5 5040 3347 2 Plate Hidden Chassis Reverse side 0460 0616 200 mm x2 Adhesive Tape for Plate 6 04263 07001 2 Gasket 0515 1550 4 Screw M3 7 0370 2862 1 Button Line Switch 04339 23001 1 Shaft Line Switch 0535 0031 1 Nut for Shaft 8 04339 25002 3 Support Line Switch Plate 0515 1076 3 Screw M3L4 Flat Head 9 04339 01202 1 Plate Line Switch 10 04263 24001 2 Nut Rod for Transformer 2190 0586 2 Washer Spring M4 3050 0893 1 Washer Flat M4 11 04263 00607 1 Plate Shield Assembly Replacement Table 3 7 Replaceable Mechanical Parts List 4
14. measurement voltage by the current Note The measurement voltage is data which must be input from the keyboard or by i GPIB commands The 4349B itself has neither voltage output capability nor 9 voltage measurement capability Analog Section Figure 4 3 shows the Analog Section block diagram An external dc voltage source applies measurement voltage to the DUT with the I V Converter connected in series The DUT is connected to the 4349B measurement channels by a triaxial cable which is a three layered coaxial cable This triaxial cable prevents noise and improves the contact check function accuracy The current flows into the I V Converter via the contact check transformer As discussed in I V Converter the I V Converter converts current flowing into to voltage ramp The attenuator and normalization amplifier enhances the number of measurement ranges and of measurement speed selections using fewer range capacitors The demultiplexer selects the measurement channel by selecting one of four or two for Option 001 I V converter output voltage ramps The voltage ramp slope which is proportional to the I V Converter input current is determined by difference between two voltage measurement results in a certain time interval 4 4 Troubleshooting Ema 9015 Vr uu Ng E 9X LIW 4012e1eqg eu am
15. theory Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products For any assistance contact your nearest Agilent Technologies Sales and Service Office Addresses are provided at the back of this manual vi Safety Symbols General definitions of safety symbols used on equipment or in manuals are listed below NE pi Warning Caution W Note i Instruction manual symbol the product is marked with this symbol when it is necessary for the user to refer to the instruction manual Alternating current Direct current On Supply Off Supply Frame or chassis terminal This Warning sign denotes a hazard It calls attention to a procedure practice condition or the like which if not correctly performed or adhered to could result in injury or death to personnel This Caution sign denotes a hazard It calls attention to a procedure practice condition or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Note denotes important information It calls attention to a procedure practice condition or the like which is essential to highlight vii Documentation Map Operation Manual Operation Manual Agilent Part Number 04349 90040 for English edition 04349 97040 for Japanese edition explains specifications basic measurement explanations and h
16. 2 DC DC Converter Output Connector Table 4 2 DC DC Converter Open Output Voltages Pin Pin Voltage Range 1 4 5 2 3 3 5 1 0 1 V 12 0 6 V 12 0 6 V 4 16 Troubleshooting Check 12 Transformer Secondary Voltage 1 Turn off the 4349B 2 Disconnect the transformer secondary connector from connector J18 on the Al Main Board Assembly Refer to Figure 4 13 for the connector location 3 Turn the 4349B on 4 Using a multimeter check if the transformer secondary voltage is between 13 V and 17 Vac 5 If passed replace the Al Main Board otherwise replace the transformer o o femme o fe
17. 2 Remove the triaxial connector Note When soldering the cable assembly to the triaxial connector refer to Figure 3 2 i and carefully solder the cable to the connector so that the center conductor 9 and the outer shield are not shorted 3 1 AL Heat Shrink Tube Heat Shrink Sleeve Tube solder Sleeve Heat Shrink Tube Solder LEO 3007 Figure 3 2 Cable Assembly Connection for Triaxial Connector 2 Assembly Replacement Troubleshooting Introduction This chapter provides assembly level troubleshooting information for the 4349B The information includes theory of operation and troubleshooting Safety Considerations This chapter contains WARNINGS and CAUTIONS that must be followed for your protection and to avoid damaging the equipment Warning The servicing procedures described herein are performed when power is A supplied to the instrument and its protective covers are removed This type of servicing must be performed only by service trained personnel who are aware of the hazards involved for example fire and electrical shock When servicing can be performed without power applied to the instrument remove power from the instrument Before any repair is completed ensure that all safety features are intact and functioning and that all necessary parts ar
18. 2l ll ll ss 4 8 Troubleshooting 4 s ll 4 44 4s 4 9 Check Procedure References AU 4 11 Check 1 DC DC Converter Output Voltage 4 11 Check 2 LCD Displays Anything 0X 4 12 Check 3 LCD Operates Correctly AA 4 12 Check 4 Any Error Message on LCD u 4 12 Check 5 CPU Related Error Message CC 4 12 Check 6 CPU Power LED Lights CU 4 12 Check 7 Any Error Code on LED CC 4 13 Check 8 CPU Fuse High Lead Voltage l l ls 4 14 Check 9 Fuse and Line Switch a a a a a a a cs 4 14 Check 10 DC DC Converter Input Voltage a a AA 4 15 Check 11 DC DC Converter Open Output Voltages 4 16 Check 12 Transformer Secondary Voltage 4 17 A Manual Changes Introduction a A 1 Manual Changes UA A 1 B Default Jumper and Switch Settings Introduction ML B 1 Jumper and Switch Settings Cc B 1 Index Contents 2 Figures 1 1 Serial Number Label 2 2 2 1 1 2 1 Adjustment Program Flow 2 0 A 2 3 2 2 Channel 1 Adjustment Setup 1 2 using DC Power Supply 2 8 2 3 Channel 1 Adjustment Setup 2 2 using DC Power Supply 2 9 2 4 Channel 1 Adjustment Setup 1 2 using DCV Calibrator 2 10 2 5 Channel 1 Adjustment Setup 2 2 using DCV Calibrator 2 11 3 1 Cover Removal 1 555555 3 9 3 2 Cable Assem
19. A Adapter 1 Adjustment 2 Troubleshooting 3 Excluding the HP 9826A Table 1 2 Required Language Extensions Name Ver Name Ver Name Ver Name Ver CLOCK 5 0 EDIT 5 1 GRAPHX 5 2 MAT 5 1 CRTA 5 1 ERR 5 1 GPIB 5 0 MS 5 1 CRTX 5 1 FGPIB 5 0 TO 5 1 PDEV 5 0 CS80 5 0 GRAPH 5 2 KBD 5 1 1 This language extension depends on the mass storage type used Table 1 3 Substitute Equipment Equipment Substitution Multimeter 3455A 3456A 3478A DC Voltage Source 3245A DATRON 4000 DATRON 4000A DATRON 4700 DATRON 4707 DATRON 4708 FLUKE 5700A 1 Substituting the DC Voltage Source involves an adjustment General Information procedure change refer to DC Voltage Source DC Power Supply or DCV Calibrator in Chapter 2 for more details Adjustments Introduction This chapter describes the adjustments required to ensure the 4349B is within its published specifications after it has been repaired or when it fails the performance tests The adjustments should be performed along with periodic maintenance to keep the 4349B in optimum operating condition If proper performance cannot be achieved after adjustments proceed to Chapter 4 Note To ensure proper results and correct instrument operation a 60 minute i warm up stabilization is required before performing the adjustments E Safety Consideration This chapter contains NOTEs CAUTIONS and WARNINGs wh
20. A2 CPU Board Assembly and other peripheral assemblies such as the keyboard and LCD The section communicates with the Al Main Board Assembly in order to control the latches switches and other components on the Al assembly and receive the measurement data The GPIB interface on the A2 Assembly allows the 4349B communicate with a controller A handler interface on the Al Assembly allows the 4349B communicate with an external handler The A2 CPU Board Assembly includes a processor ROM EEPROM jumpers switches and LEDs ROM A2U11 stores the firmware which controls all the 4349B s operation and functions The ROM is mounted in a socket for easy replacement EEPROM A2U1 stores the unit unique data such as the adjustment data and the operator unique data such as the operator saved measurement setup condition The EEPROM will not lose its data when power is turned off The EEPROM is mounted in a socket for easy replacement Jumpers and switches set the 4349B s conditions Refer to Appendix B for more information Troubleshooting 4 7 Power Supply Section Figure 4 6 shows the Power Supply Section block diagram A5 AC Inlet Bd Assy Trans DC DC Converter V Select 230 V H LINE Sha o oo 115 V vRI SA vR2 SA NEUTRAL GROUND 2 4 IT HS ET LES04004 Figure 4 6 Power Supply Section Block Diagram gt 12 V m gt 59 m gt 12 V
21. Agilent 4349B 4 Channel High Resistance Meter Service Manual SERIAL NUMBERS This manual applies directly to instruments with serial number prefix JPIKD For additional important information about serial numbers read Instruments Covered by This Manual in Chapter 1 of this manual E PB Agilent Technologies PE te Agilent Part No 04349 90033 Printed in JAPAN March 2001 Notice The information contained in this document is subject to change without notice This document contains proprietary information that is protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated to another language without the prior written consent of the Agilent Technologies Agilent Technologies Japan Ltd Component Test PGU Kobe 1 3 2 Murotani Nishi ku Kobe shi Hyogo 651 2241 Japan Copyright Agilent Technologies Japan Ltd 1996 2000 2001 Manual Printing History August 1996 2 0 00 ee First Edition part number 04349 90033 June 2000 2 aaaea arrear Second Edition part number 04349 90083 March 2001 naana aaraa e ee Third Edition part number 04349 90033 Safety Summary The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific WARNINGS elsewhere in this manual may impair the protection provided by the equipment In additi
22. Check 10 DC DC Converter Input Voltage 1 Turn on the 4349B 2 Using a multimeter check if the voltage between TP12 and TP15 on Al DC DC Converter input voltage is between 12 V and 15 Vdc Refer to Figure 4 11 for test pin locations 3 If the voltage is in range proceed to the Check 11 DC DC Converter Open Output Voltages otherwise proceed to the Check 12 Transformer Secondary Voltage LBS04012 Figure 4 11 Test Pin Locations Troubleshooting 4 15 Check 11 DC DC Converter Open Output Voltages 1 Turn off the 4349B 2 Disconnect the DC DC Converter Output Cable shown in Figure 4 12 from connector J15 on the Al Main Board Assembly 3 Turn the 4349B on 4 Using a multimeter check if the DC DC Converter open output voltages on the output connector pins shown in Figure 4 12 are in the ranges shown in Table 4 2 5 If passed replace the Al Main Board Assembly otherwise replace the DC DC Converter Assembly LBS04011 Figure 4 1
23. The information is required when the A2 assembly is replaced viii Contents 1 General Information Introduction 4 2 2 s l l e 44 4 ao o s 1 1 Instruments Covered by This Manual 2 2 2 2 2 1 1 Required Equipment O 1 2 2 Adjustments Introduction ss 2 1 Safety Consideration nG 2 1 Required Equipment oaoa a a a 2 1 Adjustment Tools 2 a a a a ll 4 A 2 2 Adjustable Components 4 s 4 4 es 2 2 Factory Selected Components 2 2 EEPROM Write Protect Switch 2 2 2 AA 2 2 Related Adjustments AAO AA AF FYrrrrrrrr 2 2 Adjustment Program AG 2 3 Program Installation 2 4 Making a Working Copy 2 4 Defining the Configuration MEL 2 4 Program Execution 2 2l e 4 4 4 44e 2 b Adjustments Procedure References 0X 2 6 DC Voltage Source DC Power Supply or DCV Calibrator 2 6 Channel 1 Adjustment 2 7 Channel 1 Adjustment Using DC Power Supply 2 7 Equipment AA 2 7 Setupl2 CU 2 8 Setup 2 2 NA 2 9 Channel 1 Adjustment Using DCV Calibrator 2 10 Equipment AA 2 10 Setup 1 2 AA 2 10 Setup 2 2 AA 2 11 Channel 2 3 and 4 Adjustments AA 2 11 3 Assembly Replacement Introduction 3 1 Ordering Information
24. any error message 4 If an error has NOT occurred replace the Al Main Board Assembly otherwise proceed to Check 5 CPU Related Error Message Check 5 CPU Related Error Message 1 If the error message is one of the following replace the A2 CPU Board Assembly otherwise replace the Al Main Board Assembly a ROM TEST FAILED b RAM TEST FAILED c EEPROM R W FAILED Note When replacing the A2 CPU Board Assembly refer to Replacing the A2 CPU i Board Assembly in Chapter 3 for handling the ROM and EEPROM on the A2 9 Assembly Check 6 CPU Power LED Lights 1 Turn on the 4349B 2 Check if the LED 5V of DSI on the AZ CPU Board Assembly lights Refer to Figure 4 9 for DS1 location 3 If the LED lights proceed to Check 7 Any Error Code on LED otherwise proceed to Check 8 CPU Fuse High Lead Voltage 4 12 Troubleshooting Check 7 Any Error Code on LED 1 Turn off the 4349B 2 Turn on the 4349B while watching LEDs on the A2 CPU Board Assembly 3 Check if the LEDs light in the sequence shown in Figure 4 9 4 If LEDs light as the sequence replace the LCD Assembly otherwise possibly HALT doesn t turn off or BERR lights replace the A2 CPU Board Assembly Note When replacing the A2 CPU Board Assembly refer to Replacing the A2 CPU i Board Assembly in Chapter 3 for handling the ROM and EEPROM on the A2 9 Assembly A2 CPU Board Assy
25. bly Connection for Triaxial Connector 2 3 12 4 1 Ohm s Law 4 2 ll a 4 3 4 2 4349B Overall Block Diagram GU 4 4 4 3 Analog Section Block Diagram GU 4 5 4 4 I V Converter Block Diagram AGA 4 6 4 5 Digital Section Block Diagram 2 l l lll 4 7 4 6 Power Supply Section Block Diagram GU 4 8 4 7 Troubleshooting Flow GU 4 10 4 8 DC DC Converter Output VoltageChek AA 4 11 4 9 CPU Board Assembly LED Light Sequence 4 13 4 10 Location of High Lead of A2Fl Fuse 4 14 4 11 Test Pin Locations AA 4 15 4 12 DC DC Converter Output Connector 2 2 2 2 2 2 25 2 52 5 524 4 16 4 13 Transformer Secondary Voltage Check cr 4 17 B 1 Jumper and Switch Settings 2 ll l l llle B 1 Tables Required Equipment Co 0X 1 2 Required Language Extensions 1 2 Substitute Equipment n 1 2 Related Adjustments Ce 2 2 3 3 Replaceable Major Assembly List Ce A2 CPU Board Assembly Replaceable Assembly List 9 4 Replaceable Assembly List CU 3 4 Replaceable Mechanical Parts List 1 AG 3 5 Replaceable Mechanical Parts List 2 ll lle 3 6 Replaceable Mechanical Parts List 8 l l 2 00 3 7 Replaceable Mechanical Parts Lit4 3 8 DC DC Converter Output Voltages Connected
26. bly Replaced Required Adjustment Al Main Board Assembly All adjustments A2 CPU Board Assy without ROM None Ab AC Inlet Board Assembly None LCD Assembly None DC DC Converter Unit None Keyboard Assembly None 1 If the EEPROM A2U1 is replaced all adjustments are required 2 2 Adjustments Adjustment Program The adjustment program listed in Table 1 1 is required for the adjustments Using the program the computer controls the 4349B and the other pieces of equipment to obtain the adjustment data and stores the data in the 4349B s internal EEPROM A2UI The adjustment program runs on the computer listed in Table 1 1 The program should be installed into your computer according to the procedure described in Program Installation To start the program after it has been installed refer to Program Execution Figure 2 1 shows the adjustment program flow The following lists the brief explanation for each menu item At the end of each adjustment the program writes the obtained adjustment data both to the 4349B internal EEPROM and to the unit serial number dependent file on the disk Channel 1 Chan Channel 3 Channel 4 Rewrite Adjustment Adjus Adjustment Adjustment EEPROM LES02001 INITIAL SETUP Channel 1 Adjustment Channel 2 Adjustment Channel 3 Adjustment Channel 4 Adjustment Rewrite EEPROM Y Y Main Menu Main Main Menu Main Menu ain Menu
27. de trim label from both sides of the front bezel Remove the four screws that secure the front panel bezel to the chassis from both sides Place the front panel assembly so that the front panel faces down Remove the two screws that secure the LCD to the front panel bezel Remove the LCD assembly from the front panel bezel Assembly Replacement 3 11 Triaxial Connector Removal Caution When accessing the traiaxial connector use lint free gloves to avoid contaminating the connector Agilent Technologies supplies lint free gloves i Agilent PN 9300 0163 Removal Procedure 1 Jo oO a C2 oo Remove the cover referring to Cover Removal Disconnect the two flatcable assemblies and the wire assembly from the front side of the A2 board Remove the two flat head screws that secure the front panel from the bottom Remove the side trim label from both sides of the front bezel Remove four screws that secure the front panel bezel to the chassis from both sides Place the front panel assembly so that the panel faces down Disconnect the cable assembly which is connected to the triaxial connector being replaced from the Al main board assembly Remove the heat shrink tube from the triaxial connector 9 Unsolder the sleeve from the triaxial connector 10 11 Unsolder the coaxial cable from the triaxial connector Unscrew the nut which fastens the triaxial connector to the sub panel 1
28. dress the order to the nearest Agilent Technologies office Restored Exchange Assemblies Some replacement assemblies are available as either new or restored assemblies The restored assembly is more economical than a new assembly and as with new assemblies a 90 day warranty applies through the instrument s support life The defective assembly must be returned for credit For this reason new assemblies must be ordered for spare parts The part numbers for both new and restored assemblies are given in the replaceable parts lists Note The Exchange Program may not apply in your country Contact the nearest i Agilent Technologies office for further details w Assembly Replacement 3 1 Replacing the A2 CPU Board Assembly The A2 CPU Board Assembly has a ROM for the firmware and an EEPROM for the adjustment data and user data Both ROM and EEPROM are mounted in sockets for easy replacement If the A2 assembly is replaced the ROM and EEPROM may be transferred from the defective assembly to the new assembly as long as the ROM and EEPROM are not defective The ROM transfer reduces parts cost for the repair and the EEPROM transfer saves time from readjusting the 4349B For this purpose the A2 assembly can only be ordered without the ROM When the A2 assembly is replaced make sure that the jumpers and switches on the A2 assembly are in the default position as shown in Appendix B Replaceable Assembly List The replaceable e
29. e Option 001 is installed a label will 9 be attached on the rear panel DC Voltage Source DC Power Supply or DCV Calibrator The following adjustments are divided into two procedures Using DC Power Supply or Using DCV Calibrator according to the type of the dc voltage source selected in the Defining the Configuration Follow only the appropriate procedure Note The 4349B adjustment requires reference current to scale the internal i current voltage converter To obtain the reference current an external dc 9 voltage source with the standard resistor 16340A connected in series is required The adjustment program allows two types of dc voltage sources a DC Power Supply and a DCV Calibrator The DC Power Supply requires a multimeter to monitor the power supply output voltage because the voltage accuracy of the power supply is insufficient for the 4349B adjustments On the other hand the DCV Calibrator requires no multimeter because its accuracy is sufficient Note Because the adjustment program doesn t control the DC Power Supply via the i GPIB and allows manual operation a power supply without GPIB capability 9 may be used if it satisfies the specification listed in Table 1 1 2 6 Adjustments Channel 1 Adjustment This adjustment updates the channel 1 adjustment data stored in the EEPROM This adjustment consists of two setups Channel 1 Adjustment Using DC Power Supply Note This section p
30. e properly connected to the protective grounding system Required Equipment Table 1 1 lists the equipment required for troubleshooting Troubleshooting 4 1 After Service Product Safety Checks Warning Whenever it appears likely that protective safety provisions have been impaired the apparatus shall be marked as inoperative and should be secured against any unintended operation The protection provisions will have likely been compromised if for example m The instrument shows visible signs of damage m The instrument fails to perform the intended measurement m The unit has undergone prolonged storage under unfavorable conditions m The instrument was severely stressed in transport Perform the following five safety checks to verify the safety condition of the 4349B these checks may also be used for safety checks after troubleshooting and repair l Visually inspect the interior of the instrument for any signs of abnormal internally generated heat such as discolored printed circuit boards and components damaged insulation or evidence of arcing Determine the cause and repair Use an ohmmeter which can accurately measure 0 1 Q to check the resistance from the instrument enclosure to the power cord s ground pin The resistance must be less than 0 1 Q Flex the power cord while making this measurement to determine if any intermittent discontinuities exist Unplug the 4349B s power plug from the powe
31. el Hidden 0515 0914 4 Screw M3 Hidden 0515 1550 2 Screw M3 Hidden 7 1250 1906 4 Triaxial Connector234 04349 01202 2 Angle Hidden 6960 0041 2 Plug Hole 8 1510 0130 1 Binding Post 2190 0067 1 Washer Hidden 2950 0006 1 Nut Hidden 9 04349 87121 1 Panel Label 1 The assembly consists of the parts designated by 5 through 9 and cables connected to the triaxial connectors 2 This part is included in the Front Panel Assembly 3 3 Includes washer and nut 4 Qty is 2 for Opt 001 5 Qty is 1 for Opt 001 6 Opt 001 only Assembly Replacement 3 5 Table 3 5 Replaceable Mechanical Parts List 2 O CAUTION For Continued protection age the same inst le parts 1 LINE Fuse 50 60Hz Voltage 45VA Max mg T GASA D D Do Selector m TOSA Tove LOS AD L6003001 Reference Agilent Part Qty Description Designation Number 1 04339 61697 1 GPIB Connector with flatcable 2 0515 1551 2 Screw M3 3 2110 0565 1 Fuse Holder 2110 0202 1 Fuse 0 25 A Slow Blow 230V 2110 0201 Fuse 0 5 A Slow Blow 115V 4 04349 00102 1 Chassis 5 2190 0054 1 Washer 2950 0054 1 Nut 1 Includes two sets of screw washer and nut 3 6 Assembly Replacement Table 3 6 Replaceable Mechanical Parts List 3 oy T n s
32. er to Replacing the 9 A2 CPU Board Assembly for more information A5 AC Inlet Board Assembly Removal Removal Procedure 1 Disconnect the cable assembly with the 4 pin connector from the A5 board 2 Remove the screw which fixes the green and yellow wire connected to the neutral terminal of the power cable connector to the bottom of the chassis 3 Remove four screws that secure the A5 board to the chassis 4 Remove the A5 board from the chassis Keyboard Assembly Removal Removal Procedure 1 Remove the cover referring to Cover Removal 2 Disconnect the two flatcable assemblies and the wire assembly from the front side of the AZ board 3 Remove the two flat head screws that secure the front panel from the bottom 3 10 Assembly Replacement oo N oO O e Remove the side trim label from both sides of the front bezel Remove four screws that secure the front panel bezel to the chassis from both sides Place the front panel assembly so that the front panel faces down Remove the screw that secures the keyboard to the front panel bezel Remove the keyboard assembly from the front panel bezel LCD Assembly Removal Removal Procedure 1 2 on 0 O A C Remove the cover referring to Cover Removal Disconnect the two flatcable assemblies and the wire assembly from the front side of the A2 board Remove the two flat head screws that secure the front panel from the bottom Remove the si
33. es recommends that you periodically request the latest Manual Changes supplement The supplement for this manual is identified by this manual s printing date and its part number both of which appear on the manual s title page Complimentary copies of the supplement are available from Agilent Technologies If the serial prefix or number of an instrument is lower than that on the title page of this manual see Appendix A Manual Changes For information concerning a serial number prefix that is not listed on the title page or in the Manual Change supplement contact the nearest Agilent Technologies office General Information 1 1 Required Equipment Table 1 1 lists the required equipment for adjusting and troubleshooting the 4349B Table 1 2 lists the required language extensions to be used with the adjustment program Table 1 3 lists the substitutions for the Multimeter and DC Voltage Source Table 1 1 Required Equipment Equipment Requirements Recommended Model Qty Use Multimeter DCV Accuracy lt 0 1 3458A 1 ALT DC Voltage Source Voltage Range 1 to 10 Vde 6634A 1 A RC Box No Substitute 16340A 1 A Computer No Substitute HP 9000 series 200 or 300 1 A RAM gt 4 Mbytes Operating System BASIC 5 1 or higher HP 98616A 1 A Adjustment Program No substitute Agilent PN 04349 65005 1 A Cable Dual Banana BNC m Cable Agilent PN 11001 60001 1 A Adapter Triaxial Tee m f f Agilent PN 1250 1551 1
34. ich must be followed to ensure operator safety and to maintain the instrument in a safe and serviceable condition The adjustments covered in this chapter should be performed only by a qualified person who is aware of the hazards Warning Any interruption of the protective ground conductor inside or outside A the instrument or disconnection of the protective ground terminal can make the instrument dangerous Intentional interruption of the protective ground system for any reason is prohibited Required Equipment Table 1 1 lists the equipment required to perform the adjustments Table 1 3 lists the substitute equipment Use only calibrated equipment when adjusting the 4349B Adjustments 2 1 Adjustment Tools No hand tools are required for the adjustments Adjustable Components There are no adjustable components such as variable capacitors or variable resistors in the 4349B All adjustments are performed by updating the adjustment data stored in the internal EEPROM Factory Selected Components No factory selected components are used in the 4349B EEPROM Write Protect Switch There are no EEPROM write protect switches in the 4349B Related Adjustments There are four adjustments for the standard 4349B and two adjustments for the 4349B with Option 001 Table 2 1 lists the adjustments that must be performed if an assembly has been replaced Table 2 1 Related Adjustments Assem
35. lectrical assemblies are listed in Table 3 1 and Table 3 3 3 2 Assembly Replacement Table 3 1 Replaceable Major Assembly List 9x LA003 101 To A2J4 Reference Agilent Part Qty Description Designation Number 1 04349 60001 1 Transformer 2 04339 66505 1 Ab AC Inlet Board Assembly 3 04263 80901 1 DC DC Converter Unit 4 04349 66511 1 Al Main Board Assembly Std 04349 69511 Al Main Board Assembly Std Exchange Assembly 04349 66521 Main Board Assembly Opt 001 04349 69521 Main Board Assembly Opt 001 Exchange Assembly 5 04263 66532 1 A2 CPU Board Assembly w o ROM 04263 00604 1 Case Shield 0515 1550 4 Screw M3 6 04349 66504 1 A4 Keyboard Assembly 04349 25101 1 Rubber Key 0515 1550 2 Screw M3 7 04263 61010 1 LCD 04263 25008 1 Filter Transparent 0515 1550 2 Screw M3 1 Included in 04263 66532 Assembly Replacement 3 3 Table 3 2 A2 CPU Board Assembly Replaceable Assembly List DO A
36. mpers and switches on the A2 CPU Board Assembly Use this information when replacing the A2 Assembly Jumper and Switch Settings Figure B 1 shows the Jumper and Switch Settings When the A2 CPU Board Assembly is replaced set the jumpers and switches to the DEFAULT side as shown in the figure A2 CPU Board Assembly Da SW1 1 If closed the power on self test errors will be ignored 0000 6000 LCSOBOO Figure B 1 Jumper and Switch Settings Default Jumper and Switch Settings B 1 Index A Al Main Board Removal 3 10 A2 CPU Board Assembly Removal 3 10 A5 AC Inlet Board Assembly Removal 3 10 Adjustable Components 2 2 Adjustment Program 2 3 Adjustments 2 1 Adjustments Procedure References 2 6 Adjustment Tools 2 2 After Service Product Safety Checks 4 2 Analog Section 4 4 Assembly Replacement 3 1 C Channel 1 Adjustment 2 7 Channel 1 Adjustment Using DC Power Supply 2 7 Channel 1 Adjustment Using DCV Calibrator 2 10 Channel 2 3 and 4 Adjustments 2 11 Check Procedure References 4 11 Cover Removal 3 9 D DC Voltage Source DC Power Supply or DCV Calibrator 2 6 Default Jumper and Switch Settings B 1 Digital Section 4 7 Disassembly P
37. mputer and bring up the BASIC system Refer to the Table 1 2 for the required language extensions 2 Set the Mass Storage Unit Specifier to the drive directory where the adjustment program exists using the MSI command 3 Load the program ADJ4349B by pressing LOAD ADJ4349B Return or Enter 4 Execute the loaded program by pressing RUN Note In the program the 4349B is referred as UUT v Note If the adjustments being performed follow right after EEPROM replacement i change switch A2SW1 1 to CLOSE so that the 4349B will ignore the self 9 test errors at power on Return the switch to the OPEN position when the adjustments have been completed Refer to Figure B 1 for the switch location Adjustments 2 5 Adjustments Procedure References This section provides supplemental information for the adjustments which are performed by the program Connection instructions and some additional explanations are provided Use this chapter as a reference when you perform the adjustments The adjustments of the 4349B without Option 001 consist of the following four adjustments Channel 1 Adjustment Channel 2 Adjustment Channel 3 Adjustment Channel 4 Adjustment The adjustments of the 4349B with Option 001 consist of the following two adjustments Channel 1 Adjustment Channel 2 Adjustment Note To identify if the 4349B is equipped with Option 001 check the label on the i instrument rear panel If th
38. nector f using the 16340A furnished BNC cable Connect the BNC Tee Adapter m to the DC Power Supply voltage output using appropriate adapter and cable Connect the BNC Tee Adapter f to the Multimeter input using the Dual Banana BNC Cable 2 8 Adjustments Setup 2 2 This setup obtains the I V Converter input resistance data and the I V Converter scaling factors 4349B 1e najaaaa DO ODDO ooo DOC0ODO Compute Triaxial Cable 16340A furnished Triax Tee Adapter Triax BNCff Adapter 00x 16340A furnished LB 02004 o OO cooopgoooo 7 16340A Top View ultimeter 2000 00 sosol O so050 00n Dual Banana BNC Cable To DC Power Supply Output Adapter 16340A furn BNC Cable 16340A furnished Figure 2 3 Channel 1 Adjustment Setup 2 2 using DC Power Supply Upon the program instructions perform the following changes 1 Disconnect the Dual Banana BNC Cable from the BNC Tee Adapter in the figure 2 Connect the Dual Banana BNC Cable to the Triaxial BNC f Adapter in the figure Adjustments 2 9 Channel 1 Adjustment Using DCV Calibrator Note This section provides adjustment procedure using a DCV Calibrator If a DC Power Supply is used refer to Channel 1 Adjustment Using DC Power
39. on it violates safety standards of design manufacture and intended use of the instrument The Agilent Technologies assumes no liability for the customer s failure to comply with these requirements Note 4349B complies with INSTALLATION CATEGORY II and POLLUTION DEGREE 2 i in IEC1010 1 4349B is INDOOR USE product w Ground The Instrument To avoid electric shock hazard the instrument chassis and cabinet must be connected to a safety earth ground by the supplied power cable with earth blade DO NOT Operate In An Explosive Atmosphere Do not operate the instrument in the presence of flammable gasses or fumes Operation of any electrical instrument in such an environment constitutes a definite safety hazard Keep Away From Live Circuits Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified maintenance personnel Do not replace components with the power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power and discharge circuits before touching them DO NOT Service Or Adjust Alone Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT Substitute Parts Or Modify Instrument Because of the danger of introducing additional hazards do not install substitute parts or perform unau
40. ow to verify conformance to published specifications Service Manual Service Manual Agilent Part Number 04349 90033 explains how to adjust troubleshoot and repair the 4349B How To Use This Manual This is the Service Manual for the 4349B 4 Channel High Resistance Meter This manual contains adjustments and repair information and consists of the following four chapters Chapter 1 General Information Chapter 1 gives general information for servicing the 4349B This chapter lists the recommended equipment for adjustments and troubleshooting Chapter 2 Adjustments Chapter 2 describes the adjustments required to ensure that the 4349B is within its published specifications after it has been repaired or it fails the performance tests Chapter 3 Assembly Replacement Chapter 3 provides the information on replacing the 4349B assemblies The information includes replaceable assembly lists and removal and installation procedures Chapter 4 Troubleshooting Chapter 4 provides the information on troubleshooting the 4349B The information includes theory of operation and information on faulty assembly isolation Appendix A Manual Changes Appendix A contains manual changes and provides information for using this manual with 4349Bs manufactured before the printing date of the manual Appendix B Default Jumper and Switch Settings Appendix B describes the settings of the jumpers and switches on the 4349B A2 CPU Board Assembly
41. p iS xeu Jexe dnnuec H OLX 1x Aedui uon ezie uoN t epe jenen p anog ebeioa JSUMOJSUBI YOSUS pegun AE NG pueg juol4 na L6504005 Figure 4 3 Analog Section Block Diagram Troubleshooting 4 5 I V Converter Figure 4 4 shows the I V converter block diagram LES04003 Figure 4 4 I V Converter Block Diagram The I V Converter is essentially an integrator composed of an operational amplifier and a capacitor When current Ix flows into the integrator the current charges the capacitor Asa result the integrator outputs a negative going ramp of which slope is The current Ix can be obtained by C a where At is a certain time interval and Av is the output voltage drop for this interval Capacitor C which is called the range capacitor determines the applicable measurement range in practical integrator 4 6 Troubleshooting Digital Section Figure 4 5 shows the Digital Section block diagram Board Assy Y0551004d Keyboard Assy Handler Figure 4 5 Digital Section Block Diagram The digital section consists of the
42. pair this product must be returned to a service facility designated by Agilent Technologies Buyer shall prepay shipping charges to Agilent Technologies and Agilent Technologies shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Agilent Technologies from another country Agilent Technologies warrants that its software and firmware designated by Agilent Technologies for use with an instrument will execute its programming instruction when property installed on that instrument Agilent Technologies does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free Limitation Of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside the environmental specifications for the product or improper site preparation or maintenance No other warranty is expressed or implied Agilent Technologies specifically disclaims the implied warranties of merchantability and fitness for a particular purpose Exclusive Remedies The remedies provided herein are buyer s sole and exclusive remedies Agilent Technologies shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal
43. r source Set the line switch to ON Tie the line and neutral pins of the power connector together and check the resistance between them and enclosure The minimum acceptable resistance is 5 MQ Find and replace any component which causes the instrument to fail this test Verify that the correct fuse is installed 5 Make sure that the grounding wire green yellow is secured to the chassis by a screw and washer 4 2 Troubleshooting Theory of Operation This section describes the overall operation of the 4349B and the operation of each assembly Overall Measurement Theory The 4349B measures the resistance of a Device Under Test DUT in the following manner Figure 4 1 Ohm s Law In Figure 4 1 a DUT is connected in series with test voltage source V and ammeter A If the ammeter measures I amperes when the source voltage is V the DUT s resistance R is expressed by when ignoring r V This equation means that if the DUT resistance R is extremely high the current flowing the circuit is extremely low For example if R 1 GQ and V 1 V the current flowing is 1 nA 107 A The 4 Channel High Resistance Meter 4349B is essentially four or two sets of very sensitive current meters Note In practice ammeter input resistance r which is approximately 1 kQ decreases i the current flowing through the DUT The actual current I flowing through the 9 DUT R is expressed by
44. rocedures 3 9 Documentation Map viii E EEPROM Write Protect Switch 2 2 F Factory Selected Components 2 2 G General Information 1 1 H How To Use This Manual viii I Instruments Covered by This Manual 1 1 I V Converter 4 6 K Keyboard Assembly Removal 3 10 L LCD Assembly Removal 3 11 M Manual Changes A 1 O Ordering Information 3 1 Overall Block Diagram 4 4 Overall Measurement Theory 4 3 P Power Supply Section 4 8 Program Installation 2 4 R Related Adjustments 2 2 Replaceable Assembly List 3 2 Replaceable Mechanical Parts List 3 5 Replacing A2 CPU Board Assembly 3 2 Required Equipment 1 2 Restored Exchange Assemblies 3 1 T Theory of Operation 4 3 Tools and Fasteners 3 9 Triaxial Connector Removal 3 12 Troubleshooting 4 1 4 9 Index 1
45. rovides adjustment procedure using a DC Power Supply If a DC i Calibrator is used refer to Channel 1 Adjustment Using DCV Calibrator w Equipment Multimeter System DC Power Supply RC Box Dual Banana BNC m Cable Triaxial Tee m f f Adapter 3458A 6634A 16340A PN 11001 60001 PN 1250 1551 Adjustments 2 7 Setup 1 2 This setup obtains the I V Converter scaling factors Compute 4349B Donaca 0090000 B 0000000000 Ko OO o006Q 00DO LJ J Z ultimeter Dual Banana Triaxial Cable BNC Cable 16340A furnished 16340A Top View Triax Tee Adapter Adapter oo 16340A furn Triax BNC f BNC Cable Adapter 00x 16340A furnished 163404 furnished Figure 2 2 Channel 1 Adjustment Setup 1 2 using DC Power Supply Perform the following steps as the program instructs 1 Connect the 16340A furnished Triaxial Cable to the 4349B Ch 1 connector 2 Connect the other end of the Triaxial Cable to the Triaxial Tee Adapter f 3 Connect the 16340A furnished Triaxial BNC f Adapter to the Triaxial Tee Adapter f 4 5 Connect the 16340A s 101 10 BNC connector to the 16340A furnished BNC Tee Adapter Connect the Triaxial Tee Adapter m directly to the 16340A s 10 10 triaxial con
46. thorized modifications to the instrument Return the instrument to a Agilent Technologies Sales and Service Office for service and repair to ensure that safety features are maintained Dangerous Procedure Warnings Warnings such as the example below precede potentially dangerous procedures throughout this manual Instructions contained in the warnings must be followed Warning Dangerous voltages capable of causing death are present in this A instrument Use extreme caution when handling testing and adjusting this instrument Certification Agilent Technologies certifies that this product met its published specifications at the time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology to the extent allowed by the Institution s calibration facility or to the calibration facilities of other International Standards Organization members Warranty This Agilent Technologies instrument product is warranted against defects in material and workmanship for a period of one year from the date of shipment except that in the case of certain components listed in General Information of this manual the warranty shall be for the specified period During the warranty period Agilent Technologies will at its option either repair or replace products that prove to be defective For warranty service or re
47. tion Define the configuration of the adjustment equipment The configuration includes the types and the GPIB addresses of the multimeter and dc voltage source to be used Because the program depends on equipment configuration it must be redefined if the equipment configuration has changed Note DC Voltage Source selection involves the adjustment procedure change Refer i to DC Voltage Source DC Power Supply or DCV Calibrator for more details Li Refer to the following procedure to define the configuration 1 Turn on the computer and bring up the BASIC system 2 Set the Mass Storage Unit Specifier to the drive directory where the adjustment program exists using the MSI command 3 Load the TE A4349B file from the adjustment program disk by pressing LOAD TE A4349B Return or Enter 4 Run the loaded program by pressing RUN 5 As the program instructs select the type of the Multimeter to be used and enter its GPIB address 6 As the program instructs select the type of the DC Voltage Source to be used and enter its GPIB address Note Once the types and GPIB addresses of both the Multimeter and DC Voltage i Source are set they cannot be changed unless the configuration is redefined Li 2 4 Adjustments Program Execution Perform the following steps to start the adjustment program Note Install the program prior to execution Refer to Program Installation y 1 Turn on the co
48. ure is common for gaining access to any of the assemblies Figure 3 1 Cover Removal 1 Remove the two screws which fasten the cover to the chassis rear panel 2 Slide the cover toward rear while hold the front panel bezel as shown in Figure 3 1 Assembly Replacement 3 9 Al Main Board Removal Removal Procedure 1 Remove the A2 CPU Board Assembly referring to A2 CPU Board Assembly Removal 2 Disconnect the following cable assemblies from the Al board a Four or two for Option 001 cables connected to the Unknown connectors b The cable assembly from the transformer c Two cable assemblies from the DC DC Converter 3 Remove the nut which fasten the Ext Trigger connector on the rear panel 4 Remove the four studs that secure the Al board to the chassis by rotating them with a flat bladed screwdriver 5 Remove six screws that secure the Al to the chassis 6 Remove the Al assembly from the chassis A2 CPU Board Assembly Removal Removal Procedure 1 Remove the cover referring to Cover Removal 2 Disconnect the four flatcable assemblies and the wire assembly from the A2 board 3 Remove the four screws that secure the A2 board to the stud 4 Remove the A2 board from the chassis Note The ROM and EEPROM on the A2 assembly may be transferred to the new i assembly to minimize the repair time and parts cost Ref
49. xial Cable C 16340A furnished 10340A Top View Triax Tee Adapter BNC Cable 163404 furnished Triax BNCI B Adapter 16340A furnished eter aoc 0500 0 Ge Dual Banana BNC Cable oou Figure 2 5 Channel 1 Adjustment Setup 2 2 using DCV Calibrator LB 02006 Upon the program instruction perform the following change 1 Connect the Multimeter input and the Triaxial BNC f Adapter using the Dual Banana BNC Cable Channel 2 3 and 4 Adjustments Perform the same setup for corresponding channel as used for Channel 1 Note Channel 3 and 4 adjustments are for 4349Bs without Option 001 only Y Adjustments 2 11 Assembly Replacement Introduction This chapter provides the 4349B replaceable parts lists and the step by step disassembly procedures for the major assemblies Table 3 1 to Table 3 7 describe all the 4349B replaceable parts The figure section of Table 3 7 also shows the cable connections Ordering Information To order a part listed in the replaceable parts lists quote the Agilent Technologies part number indicate the quantity required and address the order to the nearest Agilent Technologies office To order a part that is not listed in the replaceable parts list include the instrument model number complete instrument serial number the description and function of the part and the quantity of parts required Ad
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