Fluke 27 Service Manual
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Fluke 27 Service Manual

For iec 61010 cat iii meters only
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®
27
Multimeter
Service Manual
For IEC 61010 CAT III Meters Only
PN 690206
November 1998 Rev.1, 9/03
© 1998,2003 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

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Summary of Contents for Fluke 27

  • Page 1 ® Multimeter Service Manual For IEC 61010 CAT III Meters Only PN 690206 November 1998 Rev.1, 9/03 © 1998,2003 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.

  • Page 3: Table Of Contents

    Table of Contents Chapter Title Page Introduction and Specifications ............1-1 1-1. Using the Meter Safely ................. 1-3 1-2. Operating Instructions ................1-4 1-3. Specifications..................1-5 Theory of Operation ................2-1 2-1. Introduction................... 2-3 2-2. Functional Description ................. 2-3 2-3. Block Diagram Description ..............
  • Page 4 Service Manual 3-17. Diode Test Performance Verification ..........3-15 3-18. Calibration Adjustment................. 3-15 3-19. Calibration Preparation ..............3-15 3-20. DC Voltage Connection ..............3-16 3-21. AC Voltage Calibration..............3-16 3-22. Troubleshooting..................3-17 3-23. Power-Up Self Test ................3-17 3-24. Overall System Check ..............3-17 3-25.
  • Page 5 List of Tables Table Title Page 1-1. Specifications ......................1-5 3-1. Recommended Test Equipment ................3-3 3-2. Replacement Fuses....................3-6 3-3. Ohm Function Performance Test ................3-15 3-4. Fault Diagnosis Guide.................... 3-19 4-1. Final Assembly....................... 4-6 4-2. A1 Main PCA......................4-8 4-3.
  • Page 6 Service Manual...
  • Page 7 List of Figures Figure Title Page 3-1. Battery and Fuse Replacement................3-5 3-2. Disassembly ......................3-8 3-3. Calibration Adjustment Locations ................. 3-16 4-1. Final Assembly....................... 4-7 4-2. A1 Main PCA......................4-10 4-3. A2 Digital PCA ...................... 4-11 4-4. A4 Digital PCA ...................... 4-12 5-1.
  • Page 8 Service Manual...

  • Page 9: Title Page

    Chapter 1 Introduction and Specifications Title Page 1-1. Using the Meter Safely ................. 1-3 1-2. Operating Instructions ................1-4 1-3. Specifications..................1-5...
  • Page 10 Service Manual...

  • Page 11: Using The Meter Safely

    Introduction and Specifications Using the Meter Safely 1-1. Using the Meter Safely Use the meter as described in this manual. Otherwise the safety features provided by the meter might be impaired. A Warning identifies conditions and actions that pose hazards to the user;...

  • Page 12: Operating Instructions

    Remember to place the meter in series with the current. This manual presents service information for the Fluke 27 Multimeters. Included are a theory of operation, general maintenance procedures, performance tests, calibration procedures, troubleshooting information, a list of replaceable parts, and a schematic diagram.

  • Page 13: Specifications

    Introduction and Specifications Specifications 1-3. Specifications Instrument specifications are presented in Table 1-1. Table 1-1. Specifications Function Range Resolution Accuracy 3.200 V 0.001 V ±(0.1%+1) 32.00 V 0.01 V ±(0.1%+1) 320.0 V 0.1 V ±(0.1%+1) 1000 V ±(0.1%+1) 320.0 mV 0.1 mV ±(0.1%+1) 320.00...
  • Page 14 Service Manual Table 1-1. Specifications (cont) Input Impedance Common Mode Rejection Function Overload Normal Mode (nominal) Ratio Protection** Rejection (1 kJ unbalance) 1000 V rms 10 M in // with <100pF >120 dB at dc, 50 Hz, or 60 Hz >60 dB at 50 Hz or 60 Hz 1000 V rms 10 M...

  • Page 15: Theory Of Operation

    Chapter 2 Theory of Operation Title Page 2-1. Introduction................... 2-3 2-2. Functional Description ................. 2-3 2-3. Block Diagram Description ..............2-3 2-4. Input Overload Protection ..............2-4 2-5. Function Switching Circuits............. 2-4 2-6. Signal Conditioning Circuits ............2-4 2-7. Custom Analog IC (U1) ..............2-4 2-8.
  • Page 16 Service Manual...

  • Page 17: Introduction

    Chapter 5. 2-2. Functional Description A block diagram of the Fluke 27 circuitry is shown in Figure 2-1. As this figure shows, the instrument is composed of two major functional sections: the analog section and the digital section.

  • Page 18: Input Overload Protection

    Analog-to-digital conversion is accomplished within U1 using a modified dual-slope A/D converter circuit, as shown in Figure 2-2. The conversion method in the Fluke 27 can be described as a charge-coupled, multiple-slope technique. A series of 10 minor...
  • Page 19 Theory of Operation Block Diagram Description conversions occur every 40 ms (each at 1/10th the desired resolution) without taking time for an autozero phase between the conversions. These minor conversions (or samples, as they are called in the following discussion) occur at a rate of 25 per second, and are used to provided the fast response bar-graph display and fast autoranging.

  • Page 20: Peripherals To U1

    Service Manual preset, and bi-directional bus control for storing control outputs from the microcomputer and for transferring data to the microcomputer. Basic timing for the A/D converter is defined as a series of 10 integrate/read cycles (samples), followed by a 100 ms autozero phase. However, the diode test and continuity function, the 32 MJ range, the battery test, the power-up self test, overload recovery, ®...

  • Page 21: Display

    Characters are generated by the computer and displayed on the LCD. Both digital readings and an analog bar-graph display are presented, in conjunction with annunciators and decimal points. Refer to the Fluke 27 Users Manual for a more detailed description of the display.
  • Page 22 Service Manual...

  • Page 23: Maintenance

    Chapter 3 Maintenance Title Page 3-1. Introduction................... 3-3 3-2. Service Information ................3-4 3-3. Operator Maintenance ................3-4 3-4. Battery Replacement ................ 3-5 3-5. Fuse Test................... 3-6 3-6. Fuse Replacement................3-6 3-7. General Maintenance Information............3-7 3-8. Handling Precautions for Static-Sensitive Devices......3-7 3-9.
  • Page 24 Service Manual...

  • Page 25: Introduction

    Voltage Range: 0-1000 V ac, ±.05% Frequency Range: 40 - 10,000 Hz, ±1% DMM Calibrator Voltage Range: 0-1000 V dc Fluke Model 5500A Accuracy: ±.05% Current Range: 2 mA - 5 A Accuracy: ±.2% Values: 100 ohm, 1 kilohm, 10 kilohm, 100 kilohm, 1 megohm, 10 megohm Accuracy±.06%...

  • Page 26: Service Information

    Service Manual 3-2. Service Information The Fluke 27 has a lifetime warranty upon shipment of the instrument to the original purchaser. Conditions of the warranty are described on the registration card. Malfunctions that occur within the limits the warranty will be corrected at no cost to the purchaser.

  • Page 27: Battery Replacement

    (M) appears. The Fluke 27 is powered by a single 9 V battery (NEDA 1604, 6F22, or 006P). Referring to Figure 3-1, use the following procedure to replace the battery: 1.

  • Page 28: Fuse Test

    3-6. Fuse Replacement Referring to Figure 3-1, use the following procedure to check or replace the Fluke 27 fuses: 1. Perform steps 1 through 4 of the battery replacement procedure. 2. Pull the fuse cover down, then out of the meter.

  • Page 29: General Maintenance Information

    1 Phillips-head screwdriver for all interior screws. Reassembly requires silicone lubricant (Parker Super O-Lube is recommended) and new seals. A Fluke seal kit (Model 8025 A-7401, Fluke Part Number 738112) provides a complete set of seals and four replacement screws and washers for the bottom case.
  • Page 30 Service Manual Top Case/Digital Main Board PCB Subsection Subsection MP17 H8 (2PL) MP19 H9 (2PL) MP2 (2PL) H4 (3PL) MP18 H2 (2PL) H3 (4PL) H5 (4PL) Button-Up Subsection MP13 MP10 MP61 MP12 MP11 MP15 MP21 H7 (4PL MP16 MP14 aac04f.eps Figure 3-2.
  • Page 31 Maintenance General Maintenance Information 6. Remove the old O-ring (MP15). Clean the O-ring surfaces of the battery cover and the instrument case. Install the battery holder on the battery cover, then install the new O-ring. ® 7. Remove the four Pozidriv screws (H7) and rubber washers from the bottom case.

  • Page 32: Reassembly

    1. Position the LCD mask (MP19) in the top case (MP1), then place the LCD (U3) in the LCD mask with the Fluke part number toward the top of the instrument, pressing the LCD lightly to engage the spring action of the LCD mask. Place the LCD...
  • Page 33 Maintenance General Maintenance Information 2. Note the small bump at the center of tone edge of the momentary switch (S3-S6). Place the momentary switch in the case with the bump toward the LCD display. 3. Place the digital pca in the top case with the connector toward the back of the instrument and at the top of the case.

  • Page 34: Cleaning

    3-12. Performance Tests The following procedures allow you to check the performance of the Fluke 27 against the specifications given in the Fluke 27 Users Manual. The procedures are recommended for incoming inspections, periodic calibration verification, and as an aid in troubleshooting.

  • Page 35: Voltage Functions Performance Verification

    100 Hz. 5. Verify that the UUT indicates between 2.684 and 2.716 V ac. 6. Program the DMM Calibrator for an output of 27 V ac, at 10 kHz. 7. Verify that the UUT indicates between 26.43 and 27.57 V ac.

  • Page 36: Ohms Function Performance Verification

    18. Turn the function switch on the UUT to the dc mN/A position (mN/A). 19. Connect the DMM Calibrator output to the UUT mA/µA input terminal, then program the DMM Calibrator for an output of 27 mA dc. 20. Verify that the UUT indicates between 26.78 and 27.22 mA.

  • Page 37: Diode Test Performance Verification

    Use a non-conductive tool for adjustments. Note In the following procedures, the Fluke 27 is referred to as the unit under test, or UUT. 3-19. Calibration Preparation...

  • Page 38: Dc Voltage Connection

    Service Manual 3-20. DC Voltage Connection The dc voltage function must be calibrated before calibrating the other functions. Use the following procedure to calibrate the dc voltage function. 1. Connect the DMM Calibrator to the UUT volts/ohms/diode-test input terminal and common.

  • Page 39: Troubleshooting

    7. Program the DMM Calibrator output for 1000 V ac at 10 kHz. 8. Adjust C10 to obtain a display of 1000 V ac ±1 V ac. 9. Program the DMM Calibrator output for 27.00 V ac at 10 kHz. 10. Adjust C8 to obtain a display of 27.00 V±0.01 V ac.

  • Page 40: Dc Voltage Signal Tracing

    Service Manual isolating a malfunction to the component area, and Table 3-4 provides further fault isolation within the component area. Refer to the disassembly and reassembly procedures as necessary (paragraphs 3-9 and 3-10). 1. Set up the instrument as follows: a.

  • Page 41: Fault Diagnosis Guide

    3-26. Fault Diagnosis Guide Table 3-3 presents a fault diagnosis guide for the Fluke 27. The left column lists various malfunction. The left column lists various malfunction symptoms. The center column recommends actions to determine the exact problem. The right column lists the components most likely to be defective.
  • Page 42 Service Manual 3-20...

  • Page 43: List Of Replaceable Parts

    Chapter 4 List of Replaceable Parts Title Page 4-1. Introduction................... 4-3 4-2. How to Obtain Parts................4-3 4-3. Manual Status Information ..............4-3 4-4. Newer Instruments ................4-4 4-5. Service Centers ..................4-4 4-6. Parts Lists....................4-5...
  • Page 44 Service Manual...

  • Page 45: Introduction

    Introduction 4-1. Introduction This chapter contains an illustrated list of replaceable parts for the Fluke 27 Multimeters. Parts are listed by assembly; alphabetized by reference designator. Each assembly is ac- companied by an illustration showing the location of each part and its reference designator.

  • Page 46: Newer Instruments

    Or, visit Fluke’s Web site at www.fluke.com. Note The Fluke 27 Multimeter has been designed to meet the requirements of the United States Department of Labor Mine Safety and Health Administration for use in mines. If your instrument has MSHA approval, a decal stating so will be present on the bottom of your instrument.

  • Page 47: Parts Lists

    Reference designator • An indication if the part is subject to damage by static discharge • Description • Fluke stock number • Total quantity • Any special notes (i.e., factory-selected part) WCaution A * symbol indicates a device that may be damaged by static discharge.
  • Page 48 MP 4 O-RING,SYN RUBBER,.114 ID,.070 WIDE 705947 MP 5 SPRING,DETENT 654046 MP 6 RING,RET,EXT,FLAT,STL,.188 DIA 697078 MP 7 DECAL, TOP CASE, FLUKE 27 2094094 MP 8 SUPPORT, TOP SHIELD 654038 MP 9 SHIELD,TOP 654384 MP 10 CASE BOTTOM, YEL 203091...
  • Page 49 MP2 (2PL) MP18 H2 (2PL) H5 (4PL) Main Board Subsection MP17 H8 (2PL) H9 (2PL) H4 (3PL) Button-Up Subsection MP13 H3 (4PL) MP10 MP61 MP12 MP11 MP15 MP21 H7 (4PL MP16 MP14 FLUKE 27 T&B aac07f.eps Figure 4-1. Final Assembly...
  • Page 50 Service Manual Table 4-2. A1 Main PCA Reference Description Fluke Stock Total Designator Number * FUSE PCA 665015 AR 1 * IC, OP AMP, LOW POWER 721928 CAP,POLYES,0.022 UF,+-10%,1000 V 448183 C 4, 10 CAP,VAR,0.25-1.5 PF,1700 V,TEFLON 721480 CAP,VAR,2-7 PF,100 V,CER...
  • Page 51 654319 52-4015T;8025 AP25 CHIP ASSEMBLY TESTED 700112 DIODE,SI,RECT,BRIDGE,BV=50 V,10 =1A 418582 VR 1 * IC,1.23 V,60 PPM TC,BAND-GAP REFERENCE 654707 W002 FLUKE 27-4501;WIRE;MILLIAMP JUMPER1 665049 XF 3,4 600 VOLT FUSE CONTACT 707190 XF 5,6 CONTACT,600 V,FUSE 659524 XBT 1 FLUKE 27-4401;CONNECTOR;BATTERY;ASSY 670577 CRYSTAL,32.768 KHZ,+-1%,3 X 8 MM...
  • Page 52 Service Manual J5-1 J5-2 J5-3 J5-4 Fluke 27-4001 aac08f.eps Figure 4-2. A1 Main PCA 4-10...
  • Page 53 List of Replaceable Parts Parts Lists Table 4-3. A2 Digital PCA Reference Description Fluke Stock Number Total Designator C 12, 13, 44-47 CAP,CER,0.22 UF,+80-20%,50 V,Z5U 733386 SOCKET,1 ROW,PWB,0.100 CTR,18 POS 707026 LS 1 AF TRANSD,PIEZO,24 MM 602490 * IC,CMOS,4 BIT MICROCOMPUTER 685628 An * in ’S’...
  • Page 54 Service Manual Table 4-4. A4 Digital PCA Reference Description Fluke Stock Number Total Designator C 52-59 CAP,CER,0.1 UF,+/-10%,25 V,X7R,0805 942529 J 48 SOCKET,1 ROW,PWB,0.100 CTR,18 POS 707026 LS 1 AF TRANSD,PIEZO,24 MM 602490 R 42-46,48,49, RES,CERM,100K,+/-1%,.063W,100PPM 643863 51,54-57 R 58 RES,CERM,10K,+/-1%,.063W,100PPM...

  • Page 55: Schematic Diagrams

    Chapter 5 Schematic Diagrams...
  • Page 56 Service Manual...
  • Page 57 Schematic Diagrams J5-1 J5-2 J5-3 J5-4 Fluke 27-4001 aac08f.eps Figure 5-1. A1 Main PCA...
  • Page 58 Service Manual FLUKE 27-1001 aac10f.eps Figure 5-1. A1 Main PCA (cont)
  • Page 59 Schematic Diagrams FLUKE 27-1001 aac11f.eps Figure 5-1. A1 Main PCA (cont)
  • Page 60 Service Manual REFERENCE DESIGNATON LAST NOT USED USED C1-11,14-43 J1-7 S1,2 FLUKE 27-4002 V D D RANGE MIN/MAX HOLD S M 4 A 27LCD O S 2 O S 1 O 2 1 O 3 1 O 4 1 D P 3 0 0...
  • Page 61 Schematic Diagrams Fluke 27-4004 Aac13eps Figure 5-3. A4 Digital PCA...
  • Page 62 Service Manual Fluke 27-1004 aac14f.eps Figure 5-4. A4 Digital PCA (cont)

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