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Agilent Technologies 4349B Service Manual

4-channel high resistance meter
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  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Agilent 4349B 4-Channel High Resistance Meter Service Manual SERIAL NUMBERS This manual applies directly to instruments with serial number pre x JP1KD. For additional important information about serial numbers, read \Instruments Covered by This Manual" in Chapter 1 of this manual.
  • Page 3 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.
  • Page 4 Manual Printing History August 1996 First Edition (part number: 04349-90033) : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : June 2000 Second Edition (part number: 04349-90033) : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :...
  • Page 5 In addition 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. 4349B complies with INSTALLATION CATEGORY II and POLLUTION DEGREE 2 Note in IEC1010-1.
  • Page 6 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.
  • Page 7 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 theory. Assistance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products.
  • Page 8 Safety Symbols General de nitions of safety symbols used on equipment or in manuals are listed below. 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.
  • Page 9 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. The information is required when the A2 assembly is replaced.

  • Page 10: Table Of Contents

    Contents 1. General Information Introduction ....... . . Instruments Covered by This Manual ..... Required Equipment .
  • Page 11 A5 AC Inlet Board Assembly Removal ....3-10 Removal Procedure ......3-10 Keyboard Assembly Removal .
  • Page 12 4-1. Ohm's Law ....... . 4-2. 4349B Overall Block Diagram ......

  • Page 14: General Information

    Complimentary copies of the supplement are available from Agilent Technologies. If the serial pre x or number of an instrument is lower than that on the title page of this manual, see .

  • Page 15: Required Equipment

    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.

  • Page 16: Adjustments Introduction

    Adjustments Introduction This chapter describes the adjustments required to ensure the 4349B is within its published speci cations 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.

  • Page 17: Adjustment Tools

    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.

  • Page 18: 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, A2U1.

  • Page 19: Program Installation

    Make sure that the correct line frequency (50 or 60Hz) has been selected in the Note \UUT: 4349B" window preceding the Main Menu. This selection will improve the adjustment data accuracy. Program Installation The adjustment program must be installed in the computer using the following procedures.

  • Page 20: Program Execution

    If the adjustments being performed follow right after EEPROM replacement, Note change switch A2SW1-1 to \CLOSE", so that the 4349B will ignore the self 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.

  • Page 21: Adjustments Procedure References

    The adjustments of the 4349B with Option 001 consist of the following two adjustments. Channel 1 Adjustment Channel 2 Adjustment To identify if the 4349B is equipped with Option 001, check the label on the Note instrument rear panel. If the Option 001 is installed, a label...

  • Page 22: Channel 1 Adjustment

    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 This section provides adjustment procedure using a DC Power Supply. If a DC Note Calibrator is used, refer to \Channel 1 Adjustment Using DCV Calibrator".

  • Page 23: Setup 1/2

    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).

  • Page 24: Setup 2/2

    Setup 2/2 This setup obtains the I-V Converter input resistance data and the I-V Converter scaling factors. 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 gure).

  • Page 25: Channel 1 Adjustment Using Dcv Calibrator

    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).

  • Page 26: Setup 2/2

    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 - 10 2 " triaxial connector. 5. Connect the 16340A's \10 10 - 10 2 " BNC connector to the calibrator dc voltage output using the 16340A furnished BNC cable and appropriate adapter.

  • Page 28: 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 gure section of Table 3-7 also shows the cable connections.

  • Page 29: Replacing The A2 Cpu Board Assembly

    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.
  • Page 30 Table 3-1. Replaceable Major Assembly List Reference Agilent Part Qty. Description Designation Number 04349-60001 Transformer 04339-66505 A5 AC Inlet Board Assembly 04263-80901 DC-DC Converter Unit 04349-66511 A1 Main Board Assembly (Std) 04349-69511 A1 Main Board Assembly (Std, Exchange Assembly) 04349-66521 Main Board Assembly (Opt.

  • Page 31: A2 Cpu Board Assembly, Replaceable Assembly List

    Table 3-2. A2 CPU Board Assembly, Replaceable Assembly List Reference Agilent Part Qty. Description Designation Number 2110-1123 A2F1, Fuse SMT 2 A 1818-5146 A2U1, EEPROM 04349-85031 A2U11, ROM Rev. 1.00 Table 3-3. Replaceable Assembly List Reference Agilent Part Qty. Description Designation Number A1C500...

  • Page 32: Replaceable Mechanical Parts List

    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 Reference Agilent Part Qty. Description Designation Number 04339-04004 Cover 0363-0125 30 mm Gasket 5041-9167 Foot 1460-1345 Tilt Stand Front Panel Assembly (Std) 1 04349-65020 Front Panael Assembly (Opt.

  • Page 33: Replaceable Mechanical Parts List

    Table 3-5. Replaceable Mechanical Parts List 2 Reference Agilent Part Qty. Description Designation Number 04339-61697 GPIB Connector with atcable 0515-1551 Screw M3 2110-0565 Fuse Holder 2110-0202 Fuse 0.25 A, Slow Blow (230V) 2110-0201 Fuse 0.5 A, Slow Blow (115V) 04349-00102 Chassis 2190-0054 Washer...

  • Page 34: Replaceable Mechanical Parts List

    Table 3-6. Replaceable Mechanical Parts List 3 Reference Agilent Part Qty. Description Designation Number 0515-1550 Screw M3 (for A5) 0515-2079 Screw M4 (on the Chassis) 04263-24002 Nut Rod (for DC-DC Conv.) 2190-0584 Washer Spring M3 0515-1550 Screw M3 (for A1 and A2) 04339-24006 Stando (Hidden, for A1) 5040-3347...

  • Page 35: Replaceable Mechanical Parts List

    Table 3-7. Replaceable Mechanical Parts List 4 Reference Agilent Part Qty. Description Designation Number 04339-61614 Wire Assy (Binding Post) 04349-61605 Cable Assembly, \4" 04349-24003 Sleeve 0890-0312 25 mm Tube, Heat Shrink 04349-61606 Cable Assembly, \3" 04349-24003 Sleeve 0890-0312 25 mm Tube, Heat Shrink 04349-61607 Cable Assembly, \2"...

  • Page 36: Disassembly Procedures

    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.

  • Page 37: A1 Main Board Removal

    A1 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 A1 board. a. Four (or two for Option 001) cables connected to the Unknown connectors b.

  • Page 38: Lcd Assembly Removal

    4. Remove the side trim label from both sides of the front bezel. 5. Remove four screws that secure the front panel bezel to the chassis from both sides. 6. Place the front panel assembly, so that the front panel faces down. 7.

  • Page 39: Triaxial Connector Removal

    Triaxial Connector Removal When accessing the traiaxial connector, use lint free gloves to avoid Caution contaminating the connector. Agilent Technologies supplies lint free gloves (Agilent PN 9300-0163). Removal Procedure 1. Remove the cover referring to \Cover Removal". 2. Disconnect the two atcable assemblies and the wire assembly from the front side of the A2 board.

  • Page 40: Troubleshooting Introduction

    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 s and s that must be followed for your protection and WARNING CAUTION to avoid damaging the equipment.

  • Page 41: After Service Product Safety Checks

    0.1 . Flex the power cord while making this measurement to determine if any intermittent discontinuities exist. 3. Unplug the 4349B's power plug from the power 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.

  • Page 42: Theory Of Operation

    For example, if R = 1 G , and V = 1 V, the current owing is 1 nA (10 9 A). The 4-Channel High Resistance Meter 4349B is essentially four (or two) sets of very sensitive current meters.

  • Page 43: Overall Block Diagram

    Figure 4-2 shows the overall block diagram of the 4349B. 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.
  • Page 44 Figure 4-3. Analog Section Block Diagram T roubleshooting...

  • Page 45: I-V Converter

    I-V Converter Figure 4-4 shows the I-V converter block diagram. Figure 4-4. I-V Converter Block Diagram The I-V Converter is essentially an integrator composed of an operational ampli er and a capacitor. When current Ix ows into the integrator, the current charges the capacitor. As a result, the integrator outputs a negative going ramp of which slope is .

  • Page 46: Digital Section

    A1 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 A1 Assembly allows the 4349B communicate with an external handler.

  • Page 47: Power Supply Section

    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.

  • Page 48: Troubleshooting

    Troubleshooting Figure 4-7 shows the overall troubleshooting owchart to nd the defective assembly. Follow the owchart when troubleshooting. Refer to the \Check Procedure References" for detailed procedure to check each item. Refer to Chapter 3 for assembly replacement. Because of each assembly's high SMD (surface mount device) ratio, the repair Note should be done by assembly replacement.

  • Page 49: Troubleshooting Flow

    Figure 4-7. Troubleshooting Flow 4-10 T roubleshooting...

  • Page 50: Check Procedure References

    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 A1 Main Board Assembly are in the ranges shown in Table 4-1.

  • Page 51: Check 2, Lcd Displays Anything

    Check 2, LCD Displays Anything? 1. Turn o 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?".

  • Page 52: Check 7, Any Error Code On Led

    Check 7, Any Error Code on LED? 1. Turn o 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"...

  • Page 53: Check 8, Cpu Fuse High Lead Voltage

    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.

  • Page 54: Check 10, Dc-Dc Converter Input Voltage

    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 A1 (DC-DC Converter input voltage) is between 12 V and 15 Vdc. Refer to Figure 4-11 for test pin locations.

  • Page 55: Check 11, Dc-Dc Converter Open Output Voltages

    Check 11, DC-DC Converter Open Output Voltages 1. Turn o the 4349B. 2. Disconnect the DC-DC Converter Output Cable shown in Figure 4-12 from connector \J15" on the A1 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.

  • Page 56: Check 12, Transformer Secondary Voltage

    Check 12, Transformer Secondary Voltage 1. Turn o the 4349B. 2. Disconnect the transformer secondary connector from connector \J18" on the A1 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.

  • Page 58: Manual Changes

    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 di erent from those documented in this manual.

  • Page 60: Default Jumper And Switch Settings

    Default Jumper and Switch Settings Introduction This appendix describes the setting of the jumpers 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 side as shown in the gure.

  • Page 62: Index

    Index A1 Main Board Removal, 3-10 General Information, 1-1 A2 CPU Board Assembly Removal, 3-10 A5 AC Inlet Board Assembly Removal, 3-10 Adjustable Components, 2-2 How To Use This Manual, viii Adjustment Program, 2-3 Adjustments, 2-1 Adjustments Procedure References, 2-6 Instruments Covered by This Manual, 1-1 Adjustment Tools, 2-2 I-V Converter, 4-6...

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