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Fluke 45 Service Manual

Dual display multimeter
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Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
®
45
Dual Display Multimeter
Service Manual
For IEC 1010 Meters Only
PN 609203
March 1999 Rev.1, 1/04
© 1999-2004 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

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  • Page 1 Advanced Test Equipment Rentals www.atecorp.com 800-404-ATEC (2832) ® Dual Display Multimeter Service Manual For IEC 1010 Meters Only PN 609203 March 1999 Rev.1, 1/04 © 1999-2004 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies.
  • Page 2 Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price.

  • Page 3: Table Of Contents

    Table of Contents Chapter Title Page Introduction and Specifications ............1-1 1-1. Introduction................... 1-3 1-2. Operating Instructions ................1-3 1-3. Options and Accessories............... 1-3 1-4. Organization of the Service Manual ............. 1-4 1-5. Conventions ..................1-5 1-6. Specifications..................1-6 Theory of Operation ................2-1 2-1.
  • Page 4 Display Assembly................2-20 2-42. Main Assembly Connector............2-20 2-43. Front Panel Switches..............2-20 2-44. Display ..................2-21 2-45. Beeper Drive Circuit ..............2-21 2-46. Watchdog Timer and Reset Circuit..........2-21 2-47. Display Controller with FIP............2-22 General Maintenance ................. 3-1 3-1.
  • Page 5 Contents (continued) 3-31. Install the IEEE-488 Option ............. 3-12 3-32. Assemble the Front Panel Assembly..........3-12 3-33. Install the Front Panel Assembly............3-15 3-34. Install the Handle and Mounting Brackets ........3-15 3-35. Install the Meter Case............... 3-15 Performance Testing and Calibration ..........4-1 4-1.
  • Page 6 Replacing the EEROM A1U5 ............5-21 List of Replaceable Parts..............6-1 6-1. Introduction................... 6-3 6-2. How to Obtain Parts................6-3 6-3. How to Contact Fluke ................6-4 6-4. Manual Status Information ..............6-4 6-5. Newer Instruments ................6-4 6-6. Parts ...................... 6-4 Option -01 Battery Pack ..............
  • Page 7 Contents (continued) 8-13. Performance Testing................8-9 8-14. Troubleshooting..................8-10 8-15. Power-up Problems ................8-10 8-16. Communication Problems ..............8-10 8-17. Failure to Select IEEE-488 Interface Option ....... 8-10 8-18. Failure to Handshake on IEEE-488 Bus ........8-11 8-19. Failure to Enter Remote ............... 8-11 8-20.
  • Page 8 Service Manual...

  • Page 9: List Of Tables

    List of Tables Table Title Page 1-1. Accessories......................1-4 2-1. Analog Measurement Processor Pin Name Description ........2-9 2-2. Relay Operation ..................... 2-11 2-3. Reference Resistance ..................... 2-13 2-4. AC Volts Input Signal Dividers ................2-14 2-5. Front Panel Switch Scanning ................. 2-21 2-6.
  • Page 10 Service Manual 8-3. A5 IEEE-488 Interface PCA .................. 8-14 viii...

  • Page 11: List Of Figures

    List of Figures Figure Title Page 2-1. Overall Functional Block Diagram ................ 2-4 2-2. Analog Simplified Schematic Diagram..............2-8 2-3. DC Volts 300 V Range Simplified Schematic............2-12 2-4. Ohms Simplified Schematic................... 2-13 2-5. AC Buffer Simplified Schematic ................2-14 2-6.
  • Page 12 Service Manual 7-8. Option-01 Battery Pack Final Assembly..............7-15 7-9. A4 Battery Pack PCA..................... 7-18 8-1. Disassembly ......................8-6 8-2. IEEE-488 Interface Connector ................8-7 8-3. IEEE-488 Module Assembly.................. 8-8 8-4. IEEE-488 Interface Performance Test ..............8-10 8-5. Option -05 IEEE-488 Interface Final Assembly ............ 8-13 8-6.
  • Page 13 Chapter 1 Introduction and Specifications Title Page 1-1. Introduction..................... 1-3 1-2. Operating Instructions ................1-3 1-3. Options and Accessories................. 1-3 1-4. Organization of the Service Manual ............1-4 1-5. Conventions .................... 1-5 1-6. Specifications..................1-6...
  • Page 14 Service Manual...

  • Page 15: Introduction And Specifications

    Introduction 1-1. Introduction The Fluke 45 Dual Display Multimeter (also referred to as "the meter") is a 4-1/2-digit (30,000-count) meter with a 5-digit (100,000-count) high resolution mode designed for bench-top, field service, and system applications. The meter uses a dual vacuum- fluorescent display, allowing for two types of readings from a single input.

  • Page 16: Organization Of The Service Manual

    Service Manual The Fluke 45 Dual Display Multimeter can be mounted in a standard 19-inch rack panel on either the right-hand or left-hand side using the Fluke M00-200-634 Rack Mount Kit. Accessories for the Fluke 45 are listed in Table 1-1.

  • Page 17: Conventions

    1-5. Conventions Throughout the manual set, certain notational conventions are used. A summary of these conventions follows: • Instrument Reference The Fluke 45 Dual Display Multimeter is usually called the "meter." • Printed Circuit Assembly...

  • Page 18: Specifications

    (xxx) When associated with a keyword, a lowercase word in parentheses indicates an input required by the user. 1-6. Specifications The following contains the specifications for the Fluke 45 Dual Display Multimeter. These specifications assume: • A 1-year calibration cycle •...
  • Page 19 Introduction and Specifications Specifications Response Times Refer to Chapter 4 of the Users Manual for detailed information. DC Voltage Resolution Accuracy Range Slow Medium Fast (6 months) (1 year) 300 mV 10 µV 100 µV 0.02% + 2 0.025%+2 100 µV 1 mV 0.02% + 2 0.025% +2...
  • Page 20 Service Manual Maximum Functional Input 1000 V dc or peak ac on any range True Rms AC Voltage, AC-Coupled Resolution Range Slow Medium Fast 300 mV 10 µV 100 µV 100 µV 1 mV 30 V 1 mV 10 mV 300 V 10 mV 100 mV...
  • Page 21 When measuring AC + DC, (or any dual display combination of AC and DC) in the fast reading rate, the Fluke 45 may show significant reading errors. This results from a lack of filtering on the DC portion of the measurement for the fast reading rate.
  • Page 22 Range Burden Voltage* Slow Medium Fast 10 mA 100 µA 0.14 V 30 mA 1 µA 10 µA 0.45 V 100 mA 1 µA 10 µA 100 µA 1.4 V 10 A 100 µA 1 mA 10 mA 0.25 V...
  • Page 23 Introduction and Specifications Specifications Maximum Crest Factor Maximum Input 300 mA dc or ac rms. Protected with a 500 mA, 250 V, IEC 127-sheet I, fast blow fuse and a 440 mA, 1000 V, fast blow fuse. 10 A dc or ac rms continuous, or 20 A dc or ac rms for 30 seconds maximum. Protected with a 11 A, 1000 V, 17,000 A interrupt rating, fast blow fuse.
  • Page 24 Service Manual Open Circuit Voltage 3.2 volts maximum on the 100 Ω, 300 Ω, 30 MΩ, 100 MΩ, and 300 MΩ ranges, 1.5 volts maximum on all other ranges. Maximum Rated Input (Input Protection) 1000 V dc or rms ac on all ranges Diode Test/Continuity Maximum Reading Resolution...
  • Page 25 Input Level 5 Hz - 20 kHz 100 mA >3 mA rms 45 Hz - 2 kHz 10 A >3 A rms Note When the meter is set to measure frequency and there is no input signal (i.e., the input terminals are open), the meter may read approximately 25 kHz (rather than zero).
  • Page 26 Service Manual Environmental Warmup Time 1 hour to rated specifications Temperature Coefficient <0.1 times the applicable accuracy specification per degree C for 0°C to 18°C and 28°C to 50°C Electromagnetic Compatibility In an RF field of 1 V/m on all ranges and functions: Total Accuracy = Specified Accuracy + .4% of range.
  • Page 27 Introduction and Specifications Specifications General Common Mode Voltage 1000 V dc or rms ac maximum from any input to earth Size 9.3 cm high, 21.6 cm wide, 28.6 cm deep Weight Net, 2.4 kg without battery; 3.2 kg with battery; Shipping, 4.0 kg without battery, 4.8 with battery.
  • Page 28 Service Manual Options Battery (Option -01K) Type 8 V, Lead-Acid Operating Time 8 hours (typical). N lights when less than 1/2 hour of battery operation remains. Meter still meets specifications. Recharge Time 16 hours (typical) with meter turned off and plugged into line power. Battery will not charge when meter is turned on.

  • Page 29: Theory Of Operation

    Chapter 2 Theory of Operation Title Page 2-1. Introduction................... 2-3 2-2. Functional Block Description ............... 2-3 2-3. Power Supply..................2-3 2-4. Analog Measurement Processor ............2-3 2-5. Input Protection Circuit ..............2-3 2-6. Input Signal Conditioning ..............2-3 2-7. Analog-to-Digital (A/D) Converter ..........2-3 2-8.
  • Page 30 IEEE-488 Option Connections............. 2-20 2-41. Display Assembly................2-20 2-42. Main Assembly Connector............2-20 2-43. Front Panel Switches..............2-20 2-44. Display ..................2-21 2-45. Beeper Drive Circuit ..............2-21 2-46. Watchdog Timer and Reset Circuit..........2-21 2-47. Display Controller with FIP............2-22...

  • Page 31: Introduction

    Introduction 2-1. Introduction This chapter presents a layered description of Fluke 45 circuitry. First, the multimeter is described in general terms with a Functional Block Description. Then, each block is detailed further (often to the component level) with Detailed Circuit Descriptions. Refer to Chapter 9 of this manual for full schematic diagrams.

  • Page 32: Overall Functional Block Diagram

    Service Manual Inputs Input Protection Input Signal Conditioning Analog Measurement Processor (A/D Converter) Serial Guard Crossing Communication Vacuum Fluorrescent Display RS-232 Display Controller IEEE-488 Front Panel Option -05 Switches EEPROM Calibration Display Assembly Constants Digital Kernel 5 Vac Battery Assembly Power -5.2 Vdc Option -01...

  • Page 33: Digital Kernel

    Theory of Operation Detailed Circuit Description 2-9. Digital Kernel The Digital Kernel functional block is responsible for the coordination of all activities within the meter. This block requires power supply voltages from the Power Supply and reset signals from the Display Assembly. Specifically, the Digital Kernel Microprocessor performs the following functions: •...

  • Page 34: Raw Dc Supply

    Service Manual Inverter provides isolated positive and negative 5.25 V outputs for the in-guard circuitry. 2-15. Raw DC Supply The Raw DC Supply uses a power transformer (A1T3) that operates on input line voltages ranging from 90 V to 264 V ac. Since there is no power switch in the transformer input circuit, the Raw DC Supply is energized whenever the meter is connected to line power.

  • Page 35: Inverter

    Theory of Operation Detailed Circuit Description 2-17. Inverter The inverter uses transistors A1Q10, A1Q11, A1Q12, and A1Q13 connected to form an astable 30-kHz multivibrator. The operating frequency and drive to the transistors are determined by the values of the interconnecting resistors and capacitors. The inverter transformer (A1T2) primary is connected across the collectors of the multivibrator transistors;...

  • Page 36: Analog Simplified Schematic Diagram

    Service Manual qb02f.eps Figure 2-2. Analog Simplified Schematic Diagram...
  • Page 37 Theory of Operation Detailed Circuit Description Table 2-1. Analog Measurement Processor Pin Name Description Name Description +5 V supply ACBO AC buffer output Amps input AGND2 Analog ground #2 ACR4 AC buffer range 4 ACR3 AC buffer range 3 ACR2 AC buffer range 2 ACR1 AC buffer range 1...

  • Page 38: Input Protection

    Service Manual Table 2-1. Analog Measurement Processor Pin Name Description (cont) Name Description VREF+ A/D reference plus VREF- A/D reference minus A/D reference amplifier output A/D reference amplifier noninverting input A/D reference amplifier inverting input Active filter output Megohms filter Active filter input Filter amplifier inverting input Filter amplifier output...

  • Page 39: Relays

    Theory of Operation Detailed Circuit Description 2-21. Relays Latching relays A1K1, A1K2, and A1K3 route and connect the input signal to the functional blocks required by the selected function. The Analog Measurement Processor (A1U1) function control outputs, which are 8-ms positive pulses (0 V to VDD) at FC0 to FC5 (pins 28 to 33), control the relay driver, A1U2.

  • Page 40: Dc Volts

    Service Manual A1R6 & A1R7 A1K1 V Ω A1R5 & A1RT1 A1Z1 ACTIVE HIGH FILTER A1Z1 10.01k A1R9 A1K2 qb03f.eps Figure 2-3. DC Volts 300 V Range Simplified Schematic 2-22. DC Volts For the mV and 3 V ranges, the input signal is applied to A1U1 through A1R6, A1R7, and A1K1.

  • Page 41: Ohms Simplified Schematic

    Theory of Operation Detailed Circuit Description Depending on the range, S3, S6, S9, S13, or S15 connects the Analog Measurement Processor ohms voltage source to a reference resistor. The resulting current passes through the reference resistor, A1K2, the protection resistors A1RT1 and A1R5, and the unknown resistance.

  • Page 42: Ac Volts

    Service Manual A1R5 & A1RT1 A1C1 A1Z2 A1K3 1.111M A1AR1 A1C7 COVERTER A1Z2 2.776k A1R2 A1Z2 FEEDBACK A1Z2 RESISTOR 115.7 qb05f.eps Figure 2-5. AC Buffer Simplified Schematic Table 2-4. AC Volts Input Signal Dividers Range (Drive Signal) A1Z2 Feedback Resistor Overall Gain 100/300 mV (ACR1) 111.1 kΩ...

  • Page 43: Dcma

    Theory of Operation Detailed Circuit Description A1C4, A1C5, and A1C6 provide a filtered power supply for the ac buffer, the ac buffer switching JFETs, and the rms converter. 2-26. DCmA Current through A1R2 develops a voltage that is proportional to the input. This dc voltage is routed through A1R4 to the active filter, then to the a/d converter.

  • Page 44: Active Filter

    Service Manual A1K3 BUFFER CONVERTER RESET A1R4 ACTIVE FILTER A1R2 CONVERTER A1K1 A1F2 A1R8 A1R3 ACTIVE FILTER qb06f.eps Figure 2-6. DC mA and Amps Simplified Schematic 2-31. Active Filter Refer to Figure 2-7. The two-pole active filter consisting of A1R21, A1R22, A1C12, and A1C13 filters noise on the a-d converter input signal for the DCV, DCmA, DCA, OHMS, kOHMS, and Diode Test functions.

  • Page 45: A/D Converter

    Figure 2-7. Active Filter Simplified Schematic 2-32. A/D Converter Figure 2-8 shows the dual slope a/d converter used in the Fluke 45. A voltage level proportional to the unknown input signal charges (integrates) a capacitor for an exact amount of time. This capacitor is then discharged by a reference voltage of opposite polarity.

  • Page 46: Serial Communication (Guard Crossing)

    Service Manual provides 2 mA of current through A1VR1. Resistor network A1Z3 divides the 6.3 V down to 1.1 V. + REFERENCE (– INPUT) COUNTER REFERENCE A1C16 COMPARATOR INTREGRATE REFERENCE –REFERENCE (+ INPUT) A1Z3 INPUT BUFFER INTEGRATOR INTEGRATE INPUT qb08f.eps Figure 2-8.

  • Page 47: Interface

    Theory of Operation Detailed Circuit Description 2-35. RS-232 Interface The RS-232 interface is composed of connector A1J5, RS-232 level shifter A1U7 and the hardware serial communication interface (SCI) in Microprocessor A1U6. The transmit signal from the SCI (A1U6-14) goes to the RS-232 driver (A1U7-12), where it is inverted and shifted to transition between approximately +5.0 and -5.0 V dc.

  • Page 48: Ram

    Service Manual 6) low to indicate that it is busy writing the register, thereby controlling the timing of the write cycle. The microprocessor waits for this signal to go high before performing other EEROM operations. If the EEROM fails to drive this signal high, the microprocessor waits indefinitely.

  • Page 49: Display

    +5 V dc, one at a time. The sequence is from GRID(0) to GRID(10), which is right to left as the display is viewed. 2-45. Beeper Drive Circuit The Beeper Drive circuit is controlled by U1. A 3.6-kHz square wave appears at the PPO output of U1 and across the parallel combination of A2LS1 and A2R10, causing the beeper to resonate.

  • Page 50: Display Controller With Fip

    Service Manual comprised of dual retriggerable monostable multivibrator A2U5, NAND gates from A2U6, diode A2CR3, and various resistive and capacitive timing components. At power-up, capacitor A2C3 begins to charge up through resistor A2R3. The voltage level on A2C3 is detected by an input of Schmitt-Trigger NAND gate A2U6-12. The output of this gate (A2U6-11) then drives the active high reset signal (RESET) to the rest of the system.

  • Page 51: Command Byte Transfer Waveforms

    Theory of Operation Detailed Circuit Description kΩ (nominal) pull-down to the -30 V dc supply. These pull-downs are internal to the Display Controller. The output port, P63, of the Display Controller, is used as a grid control output for GRID(10), of the vacuum-fluorescent display. A high voltage output, from P63, is provided with a 10 kΩ...

  • Page 52: Grid-Anode Timing Relationships

    Service Manual Grid Timing 5.368 ms Grid (0) Grid (1) Grid (9) Grid (10) qb10f.eps Figure 2-10. Grid Control Signal Timing Grid/Anode Timing Grid (X0) -30V Anode (14..0) -30V 30.5 Grid (X-1) -30V qb11f.eps Figure 2-11. Grid-Anode Timing Relationships 2-24...
  • Page 53 A Message From Fluke Corporation Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices 1. Knowing that there is a problem.
  • Page 54 8. WHEN REMOVING PLUG-IN ASSEMBLIES 5. USE STATIC SHIELDING CONTAINERS FOR HANDLE ONLY BY NON-CONDUCTIVE HANDLING AND TRANSPORT. EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION. PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S.S. DEVICES. 6.

  • Page 55: General Maintenance

    Chapter 3 General Maintenance Title Page 3-1. Introduction................... 3-3 3-2. Warranty Repairs and Shipping Information........3-3 3-3. General Maintenance Information............3-3 3-4. Required Equipment................. 3-3 3-5. Power Requirements................. 3-3 3-6. Static Safe Handling................. 3-3 3-7. Cleaning....................3-4 3-8. Fuse Test and Replacement ..............3-4 3-9.
  • Page 56 Service Manual...

  • Page 57: Introduction

    The meter operates on any line voltage between 90 V ac and 264 V ac without adjustment, and at any frequency between 45 and 440 Hz. However, the meter is only warranted to meet published specifications at 50/60 Hz. The meter draws a maximum of 15 VA.

  • Page 58: Cleaning

    Service Manual Two failure modes are associated with ESD. First, a person who has acquired a static charge can touch a component or assembly and cause a transient discharge to pass through the device. The resulting current ruptures the junctions of a semiconductor. The second failure mode does not require contact with another object.

  • Page 59: Replacing The 500 Ma And 440 Ma Input Fuses (F1 And F5)

    General Maintenance Fuse Test and Replacement 3. Insert the test lead probe into the 100 mA input terminal. If the fuse is good, the meter will read between 11 and 15 Ω. If the fuse is blown, the meter will read >10 MΩ...

  • Page 60: Replacing The 10 A Input Jack Fuse (F2)

    Figure 3-2. Replacing the External 100 mA Input Fuse (F1) Table 3-1. Fuses Item Description Fluke Part No. 100 mA Input Fuse. F 500 mA, 250 V, (fast blow), 1500 A breaking 838151 capacity. 10 A Input Fuse. F 11 A, 1000 V, (fast blow), 17,000 breaking 943118 capacity.

  • Page 61: Disassembly Procedures

    General Maintenance Disassembly Procedures 3-14. Disassembly Procedures The following paragraphs describe disassembly of the Fluke 45 in sequence (from the fully assembled meter to the chassis level.) Start and end your disassembly at the appropriate heading levels. 3-15. Remove the Meter Case Use the following procedure to remove the meter case.

  • Page 62: Remove The Front Panel Assembly

    Service Manual Use a Phillips head screwdriver to remove the two handle mounting brackets. Note that these brackets must be reinstalled in their original positions. Therefore, the inside of each bracket is labeled with an "R" or an "L", referenced to the front view of the meter. qb15c.eps Figure 3-4.

  • Page 63: Remove The Ieee-488 Option

    General Maintenance Disassembly Procedures Caution Avoid using ammonia or methyl-alcohol cleaning agents on either the Front Panel of the display window. These types of cleaners can damage surface features and markings. Use an isopropyl-based cleaning agent or water to clean the Front Panel and the display window.

  • Page 64: Remove The Rms Pca

    Service Manual • Working from the bottom of the Main PCA, remove the single Phillips head screw ("J" in Figure 3-6) securing the metallic shield, then lift the plastic shield ("M") away from the top of the Main PCA. • If necessary, remove the metallic shield ("K".) Avoid contacting any circuit traces during this procedure.

  • Page 65: Install The Battery Option

    General Maintenance Assembly Procedures 2. Replace the RS-232 connector ("O") on the rear of the chassis. Use a 3/16-inch nut driver to tighten the connector hardware. Also, attach the ground wire at its chassis connection. 3. Replace the power transformer along the right side of the chassis. Use four 6-32 x .25 FHU screws ("N"), inserted from the exterior of the meter.

  • Page 66: Install The Ieee-488 Option

    3. Attach opposite ends of the ribbon cables onto the Fluke 45 Main PCA. 4. Install the IEEE-488 PCA into the small slot in the side of the Fluke 45 (two ribbon cables facing forward.) The end of the plastic standoff fits into the hole in the IEEE- 488 PCA.

  • Page 67: Assembly Details

    General Maintenance Assembly Procedures qb16c.eps Figure 3-5. Assembly Details 3-13...
  • Page 68 Service Manual qb17c.eps Figure 3-5. Assembly Details (cont) 3-14...

  • Page 69: Install The Front Panel Assembly

    General Maintenance Assembly Procedures 3-33. Install the Front Panel Assembly Use the following procedure when installing the Front Panel Assembly: 1. Snap the Front Panel Assembly into place in the four tab retainers ("B"). 2. Observing the alignment orientation provided by tabs on the connector, attach the display ribbon cable connector ("A") on the Main PCA.
  • Page 70 Service Manual 3-16...

  • Page 71: Performance Testing And Calibration

    Chapter 4 Performance Testing and Calibration Title Page 4-1. Introduction................... 4-3 4-2. Required Equipment ................4-3 4-3. Performance Tests ................4-4 4-4. Front Panel Calibration................. 4-7 4-5. Introduction ..................4-7 4-6. Entering Calibration Mode............... 4-8 4-7. Exiting Calibration Mode..............4-9 4-8.
  • Page 72 Service Manual...

  • Page 73: Introduction

    4-1. Introduction This chapter of the Service Manual provides performance tests that can be used at any time to verify Fluke 45 operation within published specifications. A complete calibration procedure is also included. The performance test and, if necessary, the calibration procedure can be performed periodically and after service or repair.

  • Page 74: Performance Tests

    COM connectors on the Fluke 45. Select the function and range on the Fluke 45 and the input level from the 5700A using the values listed in Table 4-2. The display should read between the minimum and maximum values listed in the table.
  • Page 75 Performance Testing and Calibration Performance Tests Table 4-2. Performance Tests for Volts, Diode Test, Ohms, and Frequency Functions Function Range (Rate)*** Input Level Frequency Display 100 mV (slow) short -0.006 0.006 90 mV 89.971 90.029 1000 mV (slow) 900 mV 899.71 900.29 300 mV...
  • Page 76 9.994 10.006 * Use either 2-wire compensation on the 5700A or the relative (REL) mode on the 45. ** Optional test points that can be used if standards are available. *** All measurement rates are in medium speed unless otherwise specified.

  • Page 77: Front Panel Calibration

    1 year. The chosen calibration cycle depends on the accuracy specification you wish to maintain. The Fluke 45 should also be calibrated if it fails the performance test or has undergone repair. To meet the specifications in Chapter 1, the Fluke 45 should be calibrated with equipment meeting the minimum specifications given in Table 4-1.

  • Page 78: Entering Calibration Mode

    1. Allow the Fluke 45 to stabilize in an environment with ambient temperature of 18 to 28ºC and relative humidity of less than 70%. Then turn the Fluke 45 on, and allow it to warm up for at least 1 hour.

  • Page 79: Exiting Calibration Mode

    Performance Testing and Calibration Front Panel Calibration 4-7. Exiting Calibration Mode Calibration mode can be exited at any time by pressing the Cal Enable button. However, if this button is pressed prior to completion of all calibration points for any function, no changes are made to nonvolatile calibration memory for that function.
  • Page 80 Service Manual 5. Connect the ac milliamps source to the [100 mA] and COM inputs. 6. Apply the ac milliamp outputs indicated in Table 4-5 (steps 20 and 21), and calibrating each step by pressing the button. Table 4-5. Front Panel Calibration Note Before proceeding, allow for settling time of at least 30 seconds with no input applied.

  • Page 81: Dc And Ac Amps Calibration (Front Panel)

    10 kHz * A 190 Ω source calibrates the 300 Ω range on the Fluke 45 to 0.06%+2 digits +0.02 Ω. For calibration of this range to 0.05%+2 digits +0.02 Ω, use a 290 Ω source and the procedure detailed under Alternate Ohms Calibration (Front Panel).
  • Page 82 Service Manual chapter.) In the following procedure, the Fluke 5700A Multifunction Calibrator is used as the ohms source, with input values of 190 Ω, 1.9 kΩ, 19 kΩ, 190 kΩ, and 1.9 MΩ. button to select Ω 1. If the meter is already in calibration mode, press the calibration.

  • Page 83: Alternate Ohms Calibration (Front Panel)

    Performance Testing and Calibration Front Panel Calibration 4-13. Alternate Ohms Calibration (Front Panel) The following procedure can be used with discrete resistor values (such as a decade box). On the 300 Ω range, this alternate procedure uses a 290 Ω source and yields a specification of 0.05%+2 digits +0.02 Ω.

  • Page 84: Editing The Prompt For Different Calibration Points

    300 Ω and 100 Ω ranges is 0.01%. Therefore, since calibration has been performed at less than full scale, 0.01% must be added to the Fluke 45 300 Ω and 100 Ω range accuracy to arrive at the new specification.

  • Page 85: Calibration Using The Computer Interface

    4-18. Calibration Using the Computer Interface 4-19. Setup Before performing this type of calibration, make sure that computer interface connections are made to the Fluke 45. Then verify the ac power connection to the Fluke 45, and turn the meter on. 4-20. RS-232 Interface For RS-232 interface operation, use the following procedure from the front panel: 1.

  • Page 86: Ieee-488 Interface

    IEEE-488 interface. 3. Send the following to the meter over the IEEE-488 bus: Note The following example uses Fluke BASIC commands entered from a Fluke 1722A Instrument Controller. Syntax may vary for other controllers. INIT PORT 0<CR>...
  • Page 87 Performance Testing and Calibration Calibration Using the Computer Interface Table 4-7. Calibration Using the Computer Interface Note Before proceeding, allow for settling time of at least 30 seconds with no input applied. Step Apply Input Wait For Meter Settling Time Send 0.0000 mV dc CALSTEP?

  • Page 88: The Calibration Procedure

    (xxxx... represents the known exact ohms value of the source) * A 190 Ω source calibrates the 300 Ω range on the Fluke 45 to 0.06%+2 digits +0.02 Ω. For calibration of this range to 0.05%+2 digits +0.02 Ω, use a 290 Ω source and the procedure detailed under Alternate Ohms Calibration (Computer Interface).

  • Page 89: Dc Volts Calibration (Computer Interface)

    4. Complete steps 23 and 24 in Table 4-7, and clear the amps source. 4-27. Ohms Calibration (Computer Interface) If you do not have the value resistors (290 Ω, 2.9 kΩ, 29 kΩ, etc.) required by the Fluke 45 calibration prompts, the requested value (prompt) may be set to the value available. In the following procedure, the Fluke 5700A Multifunction Calibrator is used as the ohms source, with input values of 190 Ω, 1.9 kΩ, 19 kΩ, 190 kΩ, and 1.9 MΩ.

  • Page 90: Continuity/Hysteresis Threshold Calibration (Computer Interface)

    2. Complete steps 25 through 29 in Table 4-7. Then clear the ohms source. 4-28. Continuity/Hysteresis Threshold Calibration (Computer Interface) 1. Connect the DC Volts Calibrator to the Fluke 45 and COM inputs. Then send: CAL 8 2.
  • Page 91 Performance Testing and Calibration Calibration Using the Computer Interface CAL x Start calibration of a new function, where x = 1 through 9, defined as follows: VDC calibration VAC calibration DC Milliamps calibration AC Milliamps calibration DC Amps calibration AC Amps calibration Ohms calibration Frequency comparator Frequency calibration...
  • Page 92 Service Manual Table 4-9. EEROM Calibration Constants Calconst? Valid Range Description 0.97025 to 1.03775 VDC, range 1 0.97025 to 1.03775 VDC, range 2 0.97267 to 1.04554 VDC, range 3 0.96782 to 1.04035 VDC, range 4 0.96792 to 1.04045 VDC, range 5 0.9975 to 1.0025 100 mV gain 0.9975 to 1.0025...

  • Page 93: Diagnostic Testing And Troubleshooting

    Chapter 5 Diagnostic Testing and Troubleshooting Title Page 5-1. Introduction................... 5-3 5-2. Servicing Surface-Mount Assemblies ..........5-3 5-3. Error Codes ................... 5-4 5-4. General Troubleshooting Procedures ........... 5-10 5-5. Power Supply Troubleshooting ............5-10 5-6. Raw DC Supply................5-10 5-7. 5-Volt Switching Supply..............
  • Page 94 Service Manual...

  • Page 95: Introduction

    Introduction 5-1. Introduction The Fluke 45 provides error code information and semi-modular design to aid in troubleshooting. This chapter explains the error codes and describes procedures needed to isolate a problem to a specific functional area. Finally, troubleshooting hints for each functional area are presented.

  • Page 96: Error Codes

    5-3. Error Codes At reset, the Fluke 45 software attempts power-up self-tests and initialization of ROM, RAM, Display, EEROM, and measurement hardware. Self-test failures are reported on the display with "error" in the secondary display and an error code (1-9) in the primary display.
  • Page 97 Diagnostic Testing and Troubleshooting Error Codes Table 5-1. Error Codes Error No. Meaning ROM test failed External RAM test failed Internal RAM test failed Display self-test failed Display dead EEROM meter configuration corrupted EEROM calibration data corrupted ("UNCAL" annunciator also lights) A/D chip dead Measurement self-test failed Refer to Troubleshooting information later in this chapter.
  • Page 98 Service Manual REFJ GUARD RA– GUARD VREF– VREF+ GUARD GUARD 0/VS GUARD AGND1 A1U1 ANALOG MEASUREMENT PROCESSOR P32 D2 DIGR P20 P33 D3 DIGS P21 P34 D4 DSCLK P22 P35 D5 RX P23 P36 D6 TX P24 P37 D7 DISRX P25 DISTX P26 P10 A0 EESK P27...

  • Page 99: Test Point Locator

    Diagnostic Testing and Troubleshooting Error Codes qb20c.eps Figure 5-1. Test Point Locator (cont)
  • Page 100 Service Manual qb21c.eps Figure 5-1. Test Point Locator (cont)
  • Page 101 Diagnostic Testing and Troubleshooting Error Codes A2TP2 A2TP3 A2TP6 A2TP1 A2TP5 A2TP1 A2TP3 = GROUND A2TP2 A2TP3 A2TP6 A2TP1 A2TP5 A2TP4 TEST POINT LOCATIONS (DISPLAY PCA) qb22c.eps Figure 5-1. Test Point Locator (cont)

  • Page 102: General Troubleshooting Procedures

    However, these features are somewhat limited and do not provide in-depth troubleshooting tools. The Fluke 45 incorporates a semi-modular design; determining modules not related to a problem constitutes the first step in the troubleshooting process. Disconnect the Battery Option cable at the Main PCA.

  • Page 103: 5-Volt Switching Supply

    Table 5-2. Power Supplies Supply Name Measure Supply Range From: Main PCA (In-Guard Circuits) A1TP10 COM, A1R2, or A1R3* 4.95 to 5.45 V dc VSS * A1TP12 COM, A1R2, or A1R3 -4.95 to -5.45 V dc +VAC +VAC COM, A1R2, or A1R3* 4.7 to 5.35 V...

  • Page 104: Inverter

    Service Manual • Meter with Battery Option Line Operation: 54 mV Battery Operation: 43 mV • Meter with IEEE-488 Interface and Battery Options Line Operation: 85 mV Battery Operation: 43 mV NORMAL LOAD ON 5V SUPPLY NO LOAD OR VERY LIGHT LOAD ON 5V SUPPLY 5V SUPPLY OUTPUT SHORTED HEAVY LOAD ON 5V SUPPLY qb23f.eps...

  • Page 105: Analog Troubleshooting

    A1TP3 = a 3.84 MHz sine wave (260 ns period) Check the integrator waveform referenced to COMMON: A1U1-45 should be a triangle wave when an input is being measured. Check the 1.1 V reference: A1TP2 to A1TP1 = +1.1 V In general, check that the relays are getting the proper drive signals and that they are in the correct position.

  • Page 106: Dc Volts Troubleshooting

    Service Manual To initiate the UART test, hold the button down for three seconds. If the test passes, "PASS" is shown in the secondary display. If the test fails, "FAIL" is shown in the secondary display. The test is run repeatedly, updating the "PASS" or "FAIL" display each time.

  • Page 107: Digital Troubleshooting

    Diagnostic Testing and Troubleshooting Digital Troubleshooting Table 5-4. AC Volts Troubleshooting Checkpoint Description Possible Fault A1Z2-1 Input signal A1R5, A1R5, A1C1, A1K3 A1U1-2 (ACBO) Amplified input (input x 2.5) A1U1, A1R11-A1R14, A1Q2-A1Q8, A1Z2, A1AR1, A1C7, A1R16, A1R17 A1U1-68 (RMSI) Amplified input A1U1 A6U1-14 Amplified input...

  • Page 108: Main Processor Timing

    Service Manual 2.4V 0.8V 2.4V 0.8V 2.4V RD,WR 0.8V 2.4V MCU Write 0.8V MCU Read 2.0V 0.8V 0.8V qb24f.eps Figure 5-3. Main Processor Timing To check the ROM decode circuitry, verify that A1U9-6 is transitioning low and that these transitions correspond roughly to the low-going transitions of LIR*. Pin 6 must be low when LIR* is low;...

  • Page 109: Display Assembly Troubleshooting

    Diagnostic Testing and Troubleshooting Display Assembly Troubleshooting Chip Enable is present, the problem is with either the RAM itself or the address, data, RD*, or WR* lines between the 6303Y Main Processor and the external RAM. Figure 5-3 shows the timing relationships of the 6303Y Main Processor lines LIR* and WR* to the system clock (E) and the address lines A0..A15.
  • Page 110 ANODE(12) qb27f.eps Figure 5-6. Secondary Display When a Fluke 45 display is initially powered up, all display segments should come on automatically. If this display does not appear, proceed with the following steps: Note If the display is operational but has problems with front-panel button presses, proceed directly to step 9.

  • Page 111: Calibration Failures

    Diagnostic Testing and Troubleshooting Calibration Failures 1. Check the three power supplies with respect to GND (A2TP3 or A2U1-42) on the Display Assembly. • VCC (A2U1-6) 4.85 to 5.35 V dc • VEE (A2U1-19)-5.0 to -6.0 V dc • VLOAD (A2U1-18)-28.5 to -32.0 V dc 2.

  • Page 112: Calibration-Related Components

    Check the calibration source. Is it in operate mode? Has it reverted to standby? If the calibration setup is correct, a faulty component within the Fluke 45 may be causing the failure. Each measurement function depends on a combination of components in and around the Analog Measurement Processor (A1U1).

  • Page 113: Calibration Interrelationships

    Diagnostic Testing and Troubleshooting Calibration Failures calibration step. Table 5-7 provides a different approach, relating components that are common to a group of calibration steps. 5-19. Calibration Interrelationships If you suspect calibration errors, but the meter does not exhibit the symptoms mentioned above, verify that you are observing the following calibration rules: •...
  • Page 114 Service Manual Table 5-6. Calibration Steps and Related Components Step Range Input Related Components 100 mV 0.0000 V A1VR1, A1Z3 100 mV 0.0900 V A1VR1, A1Z3 100 mV -0.0900 V A1VR1, A1Z3 1000 0.9000 V A1VR1 0.0900 V A1VR1, A1Z3 100 mV 0.2900 V A1VR1, A1Z3...
  • Page 115 Diagnostic Testing and Troubleshooting Calibration Failures Table 5-7. Components Unique to Calibration Steps Related Component (Main PCA) A1A1 A1AR A1R2 A1R3 A1U1 A1VR1 A1Y1 A1Z1 A1Z2 A1Z3 A1Z4 Step DC mA AC mA DC A AC A OHMS Continuity/Hysteresis Threshold Frequency 5-23...
  • Page 116 Service Manual Table 5-8. Calibration Hierarchy Calibration Type Prior Calibration Required DC Volts none AC Volts DC Volts DC Amps DC Volts AC Amps DC Volts Ohms DC Volts Continuity/Hysteresis Threshold none Frequency Continuity/Hysteresis Threshold Table 5-9. Calibration Constants Calconst? Valid Range Description 0.97025 to 1.03775...

  • Page 117: List Of Replaceable Parts

    Chapter 6 List of Replaceable Parts Title Page 6-1. Introduction................... 6-3 6-2. How to Obtain Parts................6-3 6-3. How to Contact Fluke ................6-4 6-4. Manual Status Information ..............6-4 6-5. Newer Instruments ................6-4 6-6. Parts ...................... 6-4...
  • Page 118 Service Manual...

  • Page 119: Introduction

    Introduction 6-1. Introduction This chapter contains an illustrated list of replaceable parts for the Fluke 45 Dual Display Multimeter. Parts are listed by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator.

  • Page 120: How To Contact Fluke

    These changes are documented on a manual supplement which, when applicable, is included with the manual. 6-6. Parts The following pages give detailed listings of Fluke 45 parts. Note This instrument may contain a Nickel-Cadmium battery. Do not mix with the solid waste stream.
  • Page 121 854104 STANDOFF, MALE 874743 SCREW, PH, 4-14 312 642931 836361 SWITCH,PUSHBUTTON,DPDT,PUSH-PUSH KEYPAD,ELASTOMERIC 855994 TRANSF,PWR,35W,90-264VAC,14.6-43VAC 609088 FLUKE 45 USER MAN, ENGLISH 855981 FLUKE 45 USER MAN, GERMAN/FRENCH 856034 CABLE ASSY,RS232 848192 WIRE ASSY,GROUND 834952 CABLE ASSY,FLAT,20 COND,MICROMOD,3 IN 831578 CORD,LINE,5-15/IEC,3-18AWG,SVT,7.5 FT 284174 1.

  • Page 122: Final Assembly

    Service Manual qb28c.eps Figure 6-1. Final Assembly...
  • Page 123 List of Replaceable Parts Parts MP11 MP12 MP38 MP10 45 T&B (Sheet 2 of 2) qb29c.eps Figure 6-1. Final Assembly (cont)
  • Page 124 Service Manual Table 6-3. A1 Main PCA Reference Fluke Description Tota Note Designator Stock l Qty TRUE RMS PCA 848200 I C,OP AMP,JFET INPUT,DECOMP,SOIC 837237 CAP,POLYES,0.1UF,+-10%,1000V 837518 CAP,CER,4.7PF,+-0.25pF,50V,C0G,1206 644978 3, 5, 9, 19, CAP,CER,0.1UF,+-10%,25V,X7R,1206 747287 22-25, 49, 17, 18 CAP,CER,4.3PF,+-10%,50V,C0G,1206...
  • Page 125 RES,WW,3.5k,+-5%,5W,20 PPM 107695 6, 7 RES,CERM,100K,+-5%,3W 820811 8, 16, 17 RES,CERM,22,+-5%,.125W,200PPM,1206 746230 9,37,38, 59 RES,CERM,10K,+-5%,.125W,200PPM,1206 746610 RES,CERM,100K,+-5%,.125W,200PPM,1206 740548 11-15, RES,CERM,47K,+-5%,.125W,200PPM,1206 746685 31,39,45, 55, 56 RES,CERM,1M,+-5%,.125W,200PPM,1206 746826 20, 27, 29 RES,CERM,200,+-5%,.125W,200PPM,1206 746339 RES,CERM,215K,+-1%,.125W,100PPM,1206 836643 RES,CERM,61.9K,+-1%,.125W,100PPM,1206 821330 RES,CERM,16.9K,+-1%,.125W,100PPM,1206 836635 RES,CERM,13.3K,+-1%,.125W,100PPM,1206 836619 RES,CERM,845,+-1%,.125W,100PPM,1206...
  • Page 126 Service Manual Table 6-3. A1 Main PCA (cont) Reference Fluke Description Total Note Designator Stock INDUCTOR,FXD,DUAL,EE24-25,0.4MH,1.2A 817379 TRANSF,INV,5VDC,30KHZ,6KV ISO,EE375 817395 MERCURY/SATURN, ASSY TESTED PLASTIC 776195 IC,ARRAY,7 NPN DARLINGTON PAIRS,SOIC 821009 3, 4 ISOLATOR, OPTO, LED, TRANSISTOR 688314 IC,NMOS,64 X 16 BIT EEPROM...
  • Page 127 List of Replaceable Parts Parts 45-4001 qb30c.eps Figure 6-2. A1 Main PCA 6-11...
  • Page 128 Table 6-4. A1A1 True Rms PCA Fluke Reference Description Tota Note Stock Designator l Qty CAP,TA,2.2UF,+-10%,35V 697433 2, 3 CAP,TA,68UF,+-20%,6.3V 821785 HEADER,2 ROW,.100CTR,RT ANG,8 PIN 845326 RES,CF,3.3K,+-5%,0.25W 854554 IC,BPLR,TRUE RMS TO DC CONVERTER 687019 45-4006 qb31c.eps Figure 6-3. A1A1 True Rms PCA 6-12...
  • Page 129 605433 DIODE,SI,BV=75V,IO=250MA,SOT23 830489 TUBE,DISPLAY,VAC FLUOR,7&8-SEG,10CHAR 783530 HEADER,1 ROW,.050CTR,20 PIN 831529 AF TRANSD,PIEZO,22 MM 602490 MP 1 FLUKE 45-3021, PWB DISPLAY 609161 TRANSISTOR, SI, PNP, 40V, 300 mW, SOT 23 742684 1, 10, 12 RES,CERM,10K,+-5%,.125W,200PPM,1206 746610 2, 5 RES,CERM,2.2M,+-5%,.125W,200PPM,1206 811778 RES,CERM,1.2M,+-5%,.125W,200PPM,1206 806240 RES, CERM,47K,±5%, .125W,220 PPM,1206...
  • Page 130 Service Manual CKT1 CKT2 45-4002 qb32f.eps Figure 6-4. A2 Display PCA 6-14...

  • Page 131: Option -01 Battery Pack

    Chapter 7 Option -01 Battery Pack Title Page 7-1. Introduction................... 7-3 7-2. Specifications..................7-3 7-3. Theory of Operation ................7-3 7-4. Functional Block Description............7-3 7-5. Switching Power Supply.............. 7-5 7-6. Cycle/Float Charge Rate Switch ..........7-5 7-7. Low Battery Indicator Detector ........... 7-5 7-8.
  • Page 132 Service Manual...

  • Page 133: Introduction

    Option -01 Battery Pack Introduction 7-1. Introduction The Fluke 45-01K Battery Kit is a field installable option that may be installed in the meter. The installation of the Battery Kit facilitates portable operation of the meter for typically eight hours.

  • Page 134: Battery Pack Option Functional Block Diagram

    Service Manual qb33f.eps Figure 7-1. Battery Pack Option Functional Block Diagram...

  • Page 135: Switching Power Supply

    Option -01 Battery Pack Theory of Operation 7-5. Switching Power Supply The switching power supply regulates the output voltage with a pulse-width modulating technique that varies the on time of the FET switch, Q5. The controller chip for this process (U4) contains the required 1 V reference, switching oscillator, regulator comparator, current limit comparators, and output switch.

  • Page 136: Constant Voltage Trickle Charger

    Service Manual When the power switch is first turned on, a pulse through C15 turns on Q13, which then turns on Q3. With the Q3 collector voltage now near its emitter voltage and the FET gate near the battery voltage, the FET switch is on. At the same time, Q12 is turned on; its collector pulls down the base of Q3, latching the circuit on.

  • Page 137: Installation

    Option -01 Battery Pack General Maintenance Rear Bezel Mounting Screw (2) Case Grounding Screw (2) Chassis qb14f.eps Figure 7-2. Removing the Case 4. Remove the two #6-32 x 1/4" panhead Phillips screws securing the Battery Pack Option (see Figure 7-4). 5.

  • Page 138: Installing The Battery Kit

    Service Manual 7. To ensure that the battery kit is properly installed, turn the meter ON before connecting the power cord. If the meter does not turn on, the battery pack may be in the discharged state. Charge the battery pack for 16 hours; then retest. qb35c.eps Figure 7-3.

  • Page 139: Performance Testing

    Option -01 Battery Pack Performance Testing qb34c.eps Figure 7-4. Battery Pack Option Connecting Cable 7-14. Performance Testing 7-15. General Operability The following performance verification assumes the following initial setup configuration: • The Battery Pack Option is physically installed in the meter. •...

  • Page 140: Low Battery Indicator Detector And Low Battery Disconnect Test

    Service Manual 7. Observing the polarity markings on the battery pack, connect the red wire to the positive (+) terminal. Then connect the black (or brown) wire to the negative (-) terminal. Reversal of these connections causes fuse F1 to open. 7-16.
  • Page 141 Option -01 Battery Pack Calibration 3. With no ac line power applied to the meter, adjust the variable voltage power supply for 8.5 V dc output. 4. Now apply ac line power, and check that the charging current is greater than 250 5.

  • Page 142: Calibration

    Service Manual 7-18. Calibration The Battery Pack Option is adjusted at the factory for optimum performance and should not require adjustment when installed. However, if either of the two adjustment pots on the top of the Battery Pack Option circuit assembly have been turned inadvertently, or if the unit has been repaired, the following procedure can be used to reset the controls for optimum battery life and proper power supply system performance.

  • Page 143: Troubleshooting

    7-19. Troubleshooting Troubleshooting can be facilitated by removing the Battery Pack Option and connecting the Battery PCA with an extender cable (Fluke Part Number 854245). Refer to the removal instructions provided earlier in this chapter. With the meter off (but plugged into line power), check for approximately 16 V dc (at 120V ac line) raw dc supply between the ground test point and the cathode of either A1CR2 or A1CR3.

  • Page 144: Additional Tests

    Service Manual qb38c.eps Figure 7-7. Test Points and Adjustments 7-20. Additional Tests The Low Battery Indicator Detector/Low Battery Disconnect Test and the Cycle/Float Charge Switch Test described earlier under Performance Testing can also be used as fault isolation aids in troubleshooting the Battery Pack Option. 7-21.
  • Page 145 Fluke Total Note Designator Stock Qty. BATTERY PCA 825885 BATTERY,LEAD-ACID,8.0V,2.5AH 822262 SCREW,PH,P,LOCK,STL,6-32,.250 152140 RETAINER,BATTERY 828814 TAPE,FOAM,URETHANE,ADHES,.063,.500 854539 FLUKE 45 BATTERY KIT INST SHEET 856013 CABLE ASSY,FLAT,10 COND,MICROMOD,3 IN 831552 45-01 T&B qb39c.eps Figure 7-8. Option-01 Battery Pack Final Assembly 7-15...
  • Page 146 Service Manual Table 7-2. A4 Battery Pack PCA Fluke Total Reference Description Note Stock Qty. Designator 6, 7 CAP,CER,1800PF,+-10%,50V,C0G,1206 769786 CAP,CER,33PF,+-10%,50V,C0G,1206 769240 CAP,AL,47UF,+-20%,50V,SOLV PROOF 822403 CAP,AL,10UF,+-20%,63V,SOLV PROOF 816843 CAP,AL,47UF,+-20%,100V,SOLV PROOF 837492 CAP,AL,1000UF,+-20%,16V,SOLV PROOF 837468 CAP,CER,0.22UF,+80-20%,50V,Y5V,1206 740597 CAP,AL,2.2UF,+-20%,50V,SOLV PROOF 769687 3, 5, 9...

  • Page 147: A4 Battery Pack Pca

    Option -01 Battery Pack List of Replaceable Parts Table 7-2. A4 Battery Pack PCA (cont) Reference Fluke Total Description Note Designator Stock Qty. INDUCTOR,FXD,DUAL,EE24-25,0.4MH,1.2A 817379 IC,VOLT REG,ADJ,1.2 TO 37 V,1.5 AMPS 460410 IC,COMPARATOR,DUAL,LOW PWR,SOIC 837211 IC,CMOS,HEX BUFFERS,SOIC 837229 IC,VOLT REG,ADJ,SWITCHING REGULATOR 821215 IC, 1.23V,150 PPM T.C.,BANDGAP V.
  • Page 148 Service Manual qb40c.eps Figure 7-9. A4 Battery Pack PCA 7-18...

  • Page 149: Option -05 Ieee-488 Interface

    Chapter 8 Option -05 IEEE-488 Interface Title Page 8-1. Introduction................... 8-3 8-2. Theory of Operation ................8-3 8-3. Functional Block Description............8-3 8-4. Detailed Circuit Description............. 8-3 8-5. Main Assembly Connectors ............8-3 8-6. Address Decoding Circuit............8-3 8-7. Isolation Circuits ................8-4 8-8.
  • Page 150 Service Manual...

  • Page 151: Introduction

    Introduction 8-1. Introduction The IEEE-488 Interface turns the Fluke 45 into a fully programmable instrument for use with the IEEE Standard 488.1 (1987) interface bus (IEEE-488 bus). With the IEEE-488 Interface, the Fluke 45 can become part of an automated instrumentation system.

  • Page 152: Isolation Circuits

    Service Manual 8-7. Isolation Circuits The Isolation Circuits allow the Microprocessor to turn off power to the A5U6, A5U7, and A5U8 components. These three components consume the majority of the power on the IEEE-488 Assembly; normal meter operation on batteries is extended by approximately 100% with this power isolation scheme.

  • Page 153: Ieee-488 Transceivers/Connector

    Option -05 IEEE-488 Interface Theory of Operation When the Microprocessor drives OPTSW* to VEE to enable the VCC2 power supply, the CLR* input to the D flip-flop (A5U9-13) goes high to enable the flip-flop. The Q output (A5U9-9) remains low until the Microprocessor does an initial dummy memory cycle to the IEEE-488 Controller (approximately 1 ms later.) The rising edge at the end of the chip select signal (A5U9-11) clocks the flip-flop and causes the Q output to go high.
  • Page 154 Service Manual Table 8-1. IEEE-488 Transceiver Control Transceiver TE = 0 (Listener) TE = 1 (Talker) DI01..DI08 Receiver Transmitter Transmitter Transmitter Receiver Receiver Receiver Receiver (ATN = 0) Receiver Transmitter (ATN = 1) Receiver Transmitter NRFD Transmitter Receiver NDAC Transmitter Receiver Receiver Receiver...

  • Page 155: Ieee-488 Interface Connector

    Option -05 IEEE-488 Interface Theory of Operation qb41c.epc Figure 8-2. IEEE-488 Interface Connector...

  • Page 156: General Maintenance

    8-11. Removing the IEEE-488 Interface Option The following instructions can be used for access and servicing an IEEE-488 Interface Option that is already installed in a Fluke 45 Dual Display Multimeter. For initial installation, refer to the Instruction Sheet (PN 856005) provided with the option.

  • Page 157: Installing The Ieee-488 Interface Option

    4. Attach opposite ends of the ribbon cables onto the Fluke 45 Main PCA. 5. Install the IEEE-488 PCA in the Fluke 45 with the dual ribbon cables facing the front of the meter. The IEEE-488 PCA slips into the small slot in the side of the meter.

  • Page 158: Troubleshooting

    The following discussion identifies probable fault areas if the installation of an IEEE- 488 Interface Option causes power-up failure for the Fluke 45. The problem is probably a short on A5P2 or A5P3; the Microprocessor on the Main Assembly is prevented from accessing ROM and RAM correctly.

  • Page 159: Failure To Handshake On Ieee-488 Bus

    Option -05 IEEE-488 Interface Troubleshooting If the IEEE-488 Interface Option is not detected by Fluke 45 software, there may be a problem with the OPS or ACON* signal. The IEEE Interface Option grounds the OPS signal (A5P2-18), which is normally pulled up to VCC on the Fluke 45 Main Assembly.

  • Page 160: Failure To Receive Multiple Character Commands

    Service Manual 8-20. Failure to Receive Multiple Character Commands Monitor the interrupt signal from A5U6-10 during attempts to communicate with the meter. Each byte received with the ATN signal (A5U6-31) high should cause the interrupt signal to go low. Follow the interrupt signal through A5U4, and verify that it arrives at A5J3 properly.
  • Page 161 Stock Qty. IEEE-488 INTERFACE PCA 814152 SCREW,PH,P,LOCK,STL,6-32,.250 152140 CONN ACC,MICRO-RIBBON,SCREW LOCK KIT 836585 SPACER,SNAP,PWB,NYL,1.375 845347 PRINT MATL,INST SHT,FLUKE 45/IEEE-488 856005 CABLE ASSY,IEEE 834978 CABLE ASSY,FLAT,14 COND,MICROMOD,3 IN 831560 CABLE ASSY,FLAT,20 COND,MICROMOD,3 IN 831578 45-5 T&B qb43c.eps Figure 8-5. Option -05 IEEE-488 Interface Final Assembly...

  • Page 162: A5 Ieee-488 Interface Pca

    Service Manual Table 8-3. A5 IEEE-488 Interface PCA Fluke Reference Total Stock Description Note Designator Qty. 6- 11 CAP,CER,0.1UF,±10%,25V,X7R,1206 747287 CAP,CER,0.022UF,±10%,50V,X7R,1206 747279 DIODE,SI,BV=75V,IO=250MA,SOT23 830489 HEADER,2 ROW,.100CTR,24 PIN 831834 HEADER,1 ROW,.050CTR,20 PIN 831529 HEADER,1 ROW,.050CTR,14 PIN 831511 TRANSISTOR,SI,PMOS,1W,D-PAK 836544 RES,CERM,5.1K,±5%,125W,200PPM,1206 746560 RES,CERM,47K,±5%,.125W,200PPM,1206...
  • Page 163 Option -05 IEEE-488 Interface List of Replaceable Parts qb44c.eps Figure 8-6. A5 IEEE-488 Interface PCA 8-15...
  • Page 164 Service Manual 8-16...

  • Page 165: Figure Title Page

    Chapter 9 Schematic Diagrams Figure Title Page A1 Main PCA ..................9-2 A2 Display PCA ..................9-8 A1A1 True Rms PCA ................9-10 A4 Battery PCA ..................9-12 A5 IEEE-488 Interface PCA..............9-14...

  • Page 166: A1 Main Pca

    Service Manual 45-4001 qb30f.eps Figure 9-1. A1 Main PCA...

  • Page 167: Schematic Diagrams

    Schematic Diagrams 45-1001 (Sheet 1 of 3) qb45sc.tif Figure 9-1. A1 Main PCA (cont)

  • Page 168: A1 Main Pca

    45 Series Service Manual 45-4001 Figure 9-1. A1 Main PCA (cont)
  • Page 169 Schematic Diagrams 45-1001 (Sheet 2 of 3) qb46sc.tif Figure 9-1. A1 Main PCA (cont)
  • Page 170 45 Series Service Manual 45-4001 Figure 9-1. A1 Main PCA (cont)
  • Page 171 Schematic Diagrams 45-1001 (Sheet 3 of 3) qb47sc.tif Figure 9-1. A1 Main PCA (cont)

  • Page 172: A2 Display Pca

    45 Series Service Manual CKT1 CKT2 45-4002 Figure 9-2. A2 Display PCA...

  • Page 173: Primary Display

    M I N HOL D ANODE5 FI L FI L2 ANODE6 ANODE7 FI L ANODE8 UNCAL 45-1002 ANODE9 FI L TOTAL ANODE1 0 ANODE1 1 ANODE1 2 PRI M ARY DI SPLAY SECONDARY DI SPLAY ANODE1 3 ANODE DEFI NI TI ONS...

  • Page 174: A1A1 True Rms Pca

    45 Series Service Manual 45-4006 Figure 9-3. A1A1 True rms PCA 9-10...

  • Page 175: A1A1 True Rms Pca

    Schematic Diagrams 45-1006 qb49sc.tif Figure 9-3. A1A1 True rms PCA (cont) 9-11...

  • Page 176: A4 Battery Pca

    45 Series Service Manual Figure 9-4. A4 Battery PCA 9-12...
  • Page 177 Schematic Diagrams 45-1004 qb53sc.tif Figure 9-4. A4 Battery PCA (cont) 9-13...
  • Page 178 45 Series Service Manual Figure 9-5. A5 IEEE-488 Interface PCA 9-14...

  • Page 179: A5 Ieee-488 Interface Pca

    Schematic Diagrams 45-1005 qb54sc.tif Figure 9-5. A5 IEEE-488 Interface PCA (cont) 9-15...
  • Page 180 45 Series Service Manual 9-16...
  • Page 181 Index calibration interrelationships, 5-21 calibration using the computer interface, 4-15 —1— calibration-related components, 5-20 100 mq and 300 mq ranges, 2-14 cleaning, 3-4 communication problems, 8-10 —5— concluding calibration using the computer interface, 4-20 5-volt switching supply, 2-6, 5-11 constant voltage trickle charger, 7-6 continuity/hysteresis threshold calibration —A—...
  • Page 182 1-3 general troubleshooting procedures, 5-10 options and accessories, 1-3 organization of the service manual, 1-4 —H— other circuits, 7-6 how to contact fluke, 6-4 how to obtain parts, 6-3 —P— performance testing, 7-9, 8-9 —I— performance tests, 4-4...
  • Page 183 Index (continued) remove the analog measurement processor setup, 4-15 shields, 3-9 specifications, 1-6, 7-3 remove the battery option, 3-10 Specifications, 1-6 remove the display pca, 3-8 static safe handling, 3-3 remove the front panel assembly, 3-8 switching power supply, 7-5 remove the ieee-488 option, 3-9 remove the main pca, 3-9 —T—...
  • Page 184 Service Manual...

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