11 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. Primary and secondary displays show the user-defined readings side by side. Even though the readings are made sequentially, the displays show both readings at all times...

219 Input Protection

Input protection safeguards the meter against a number of over-voltage and over-current conditions. The various input protection schemes are as follows In the Voltage mode of operation, MOVs A1RV1, A1RV2 and A1RV3 clamp input voltage transients to about 1800 volts, and A1R5, A1RT1 and A1R6 limit the current. In this mode, A1R7 and the 10-MW resistor in A1Z1 protect A1U1. In the Ohms and Diode Test modes, A1Q1 clamps voltage inputs of both polarities, and A1R5 and thermistor A1RT1 limit the...

231 Active Filter

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. Resistor A1R22 provides a 200-kW input impedance for the filter, except as follows Resistors A1R6 and A1R7 provide the 200-kW input impedance for the 100 mV dc, 300 mV dc, 1000 mV dc, 3 V dc, ohms, and kilohms ranges. Resistor A1R10 and the 100.5 kW resistor in A1Z1 provide the 200 kW impedance...

232 AD 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. The capacitor discharge time, which is proportional to the level of the unknown input signal, is measured by the digital circuits in the Analog Measurement Processor and sent to the microprocessor. In the medium and fast measurement...

234 Digital Kernel

The Digital Kernel is composed of six functional circuit blocks the RS-232 interface, the Microprocessor, the EEROM (Electrically Erasable Read Only Memory), the RAM (Random Access Memory), the ROM (Read Only Memory), and the IEEE-488 Option Connections. These blocks are described in the following paragraphs. 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...

29 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 Executes the instructions in ROM Stores temporary data in RAM Store meter configuration and calibration data in EEROM Communicates with the Analog Measurement Processor via the Serial Communication...

310 Current Input Fuses

The 100 mA and 10 A inputs are protected by replaceable fuses. The 100 mA input is protected by 2 fuses, F1 and F5. F1 is rated at F 500 mA, 250 V (fast blow), 1500 A minimum breaking capacity, IEC-127 Sheet I and F5 is rated at 440 mA, 1000 V, 10,000 A minimum interrupt rating, (fast blow) fuse. The 10 A input is also protected by a fuse, F2, rated at F 11 A, 1000 V (fast blow), 17,000 A breaking capacity. Perform the following procedure to test these fuses 1. Plug a test lead into the VH...

319 Remove the IEEE488 Option

Chapter 8 of this manual provides a detailed removal procedure for the IEEE-488 option. The following removal instructions provide the essentials of this procedure. If necessary, refer to the complete procedure in Chapter 8, paying particular attention to Figures 8-2 and 8-3. 1. Use needle nose pliers to disconnect the 24-line cable assembly at the IEEE-488 PCA. Alternately pull on each end of the cable connector. 2. Remove the panhead Phillips screw at the rear of the IEEE-488 PCA. 3. Use...

324 Disconnect Miscellaneous Chassis Components

The following procedures can be used to disconnect remaining hardware from the chassis 1. Use needle nose pliers to remove the internal connections at the line power plug. 2. Remove the power plug by releasing its two snaps, one at a time. 3. Disconnect the power transformer by removing the four screws (N in Figure 3-5) that secure it to the right side of the chassis. 4. Remove the RS-232 connector (O) on the rear of the chassis. Use a 3 16-inch nut driver to loosen the connector securing...

326 Install Miscellaneous Chassis Components

Use the following procedure to replace any items that have been removed from the basic chassis. 1. Install the IEEE connector on the rear of the chassis. 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. 4. Snap the...

411 DC and AC Amps Calibration Front Panel

The dc and ac amps calibration requires a boost amplifier or transconductance amplifier capable of 10 A output at both dc and 1 kHz. 1. If the meter is already in calibration mode, press the ( B or button to select A DC calibration. Otherwise, select calibration mode first (press Cal Enable button for three seconds), then select A DC calibration by pressing the ( button four times. 2. Connect the output of the boost amplifier to the 10 A and COM inputs of the meter. 3. Apply the dc amp output...

412 Ohms Calibration Front Panel

If you do not have the value resistors (290 W, 2.9 kW, 29 kW, etc.) required by the Fluke 45 calibration prompts, the requested value (prompt) must be edited to the value available. (See Editing the Prompt for Different Calibration Points, later in this chapter.) In the following procedure, the Fluke 5700A Multifunction Calibrator is used as the ohms source, with input values of 190 W, 1.9 kW, 19 kW, 190 kW, and 1.9 MW. 1. If the meter is already in calibration mode, press the ( B or button to...

413 Alternate Ohms Calibration Front Panel

The following procedure can be used with discrete resistor values (such as a decade box). On the 300 W range, this alternate procedure uses a 290 W source and yields a specification of 0.05 +2 digits +0.02 W. Alternate calibration of this range is detailed below, although discrete resistor values can be used for all ranges. Lead and source zero resistances are only taken into account for the lowest two ranges (300 W and 3 kW). 1. Connect the ohms source to the meter. Apply zero ohms. 2. Measure...

414 Continuity Hysteresis Threshold Calibration Front Panel

If the meter is already in calibration mode, press the ( B or button to select V calibration. Otherwise, select calibration mode first (press Cal Enable button for three seconds), then select V calibration by pressing the ( B button seven times. 2. Connect the output of the dc voltage source to the VH and COM input of the meter. 3. Apply the outputs indicated in Table 4-5, and calibrate using the A button.

416 Editing the Prompt for Different Calibration Points

Except for the first three prompts in VDC (0.000 mV, +90.000 and -90.000 mV are calibration constants), the Fluke 45 can be calibrated using calibration points other than the prompted values. To do this, you must edit the prompt to the reference source value as follows 1. Press the editor button. This intensifies the left-most digit of the numeric display and turns the EDIT annunciator on. 2. Press the ( editor button to increment the intensified digit from 0-9. 3. Press the editor button again...

45

1999 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies. LIMITED WARRANTY & LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke...

48 DC Volts Calibration Front Panel

To perform VDC calibration, proceed as follows 1. Press the Cal Enable button for 3 seconds to enter the calibration mode. Or, if the meter is already in calibration mode, but set for a different type of calibration, press the button to return to VDC calibration. 2. Press the button to select the first prompt (0.000 mV DC) for the VDC function. 3. Apply a shorting bar to the V and COM inputs of the meter and allow 5 seconds for meter settling. After voltage is applied to the VH input, the meter...

DC Current

Protected with a 500 mA, 250 V, IEC 127-sheet I, fast blow fuse and a 440 mA, 1000 V, fast blow fuse. A 10 A dc 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. Resistance between the COM binding post and the meter's internal measuring circuits is approximately .003 W

Ohms

* Because of the method used to measure resistance, the 100 MW (slow) and 300 MW(medium and fast) ranges cannot measure below 3.2 MW and 20 MW, respectively. UL (underload) is shown on the display for resistances below these nominal points, and the computer interface outputs +1E-9. 3.2 volts maximum on the 100 W, 300 W, 30 MW, 100 MW, and 300 MW ranges, 1.5 volts maximum on all other ranges. Maximum Rated Input (Input Protection) 1000 V dc or rms ac on all ranges

True Rms AC Voltage ACCoupled

* Error in power mode will not exceed twice the linear accuracy specification Accuracy specifications apply within the following limits, based on reading rate Slow Reading Rate Between 15,000 and 99,999 counts (full range) Medium Reading Rate Between 1,500 and 30,000 counts (full range) Fast Reading Rate Between 150 and 3,000 counts (full range) 1 MW in parallel with < 100 pF > 60 dB at 50 or 60 Hz (1 kW unbalanced medium rate) 2 x 107 Volt-Hertz product on any range, normal mode input 1 x...

A symbol indicates a device that may be damaged by static discharge

Electrical components may be ordered directly from the manufacturer by using the manufacturers part number, or from the Fluke Corporation and its authorized representatives by using the part number under the heading FLUKE STOCK NO. Parts price information is available from the Fluke Corporation or its representatives. Prices are also available in a Fluke Replacement Parts Catalog which is available on request. In the event that the part ordered has been replaced by a new or improved part, the...

61 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. The parts lists give the following information An indication if the part is subject to damage by static discharge Any special notes (i.e., factory-selected part)

521 Replacing the Eerom A1U5

The EEROM provides non-volatile storage for the serial number of the meter, meter configuration and calibration information. If the EEROM is replaced during repair, the new EEROM should be programmed with the 7-digit serial number, found on the rear panel of the meter. Use the following command to program the serial number into the EEROM SERIAL XXXXXXX (xxxxxxx denotes the 7-digit serial number. Note once entered, the serial number cannot be changed.) Table 5-6. Calibration Steps and Related...

519 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 Stored dc volts calibration constants influence constants for several other functions. If dc volts is recalibrated, these other functions must be recalibrated. This interrelationship is explained in Table 5-8. Independent calibration of any function except dc volts results in the storage of correcting calibration constants for that...

517 Introduction

Calibration processes for both front panel and computer interface operation are described in Chapter 4 of this manual. Generally, a calibration failure is noted with an error beep and a displayed 'Error' at the front panel and a device dependent error over the computer interface. These indications occur if the input varies from what the meter expects to see by more than 15 . After one second, the meter reverts to normal operation in calibration mode. Before suspecting a fault with the Fluke 45,...

514 Digital Troubleshooting

At power-up, if the display does not light or lights up and fails to report errors or begin operation, use the following troubleshooting procedures. First check the state of SWR1 (A1U6-21). If this status line is less than 0.8 V, basic processor operation is intact. Examining SWR2 through SWR5 (A1U6-22 through -25, respectively) should indicate how far the software progressed before finding an error. If the state of SWR1 is not less than 0.8 V, the problem may be in the 6303Y Main Processor...

59 Analog Troubleshooting

Analog circuit problems are evidenced by Error 8 or Error 9 in the display. These errors signify either that the Main Processor (A1U6) is not communicating with the in-guard circuitry or that the Analog Measurement Processor (A1U1) is not functioning correctly. First, check the in-guard power supplies referenced to common Power Supply Testpoint Range VDD A1TP10 4.95 to 5.45 V dc VSS A1TP12 -4.95 to -5.45 V dc Check the out-guard to in-guard communication for activity whenever a front panel...

52 Servicing Surface Mount Assemblies

The 45 Dual Display Multimeter incorporates Surface-Mount Technology (SMT) for printed circuit assemblies (pca's). Surface-mount components are much smaller than their predecessors, with leads soldered directly to the surface of a circuit board no plated through-holes are used. Unique servicing, troubleshooting, and repair techniques are required to support this technology. The information offered in the following paragraphs serves only as an introduction to SMT. It is not recommended that...

51 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. But first, if the meter fails, check the fuses and replace as needed. If the problem persists, verify that you are operating the meter correctly by reviewing the operating instructions found in the User's...

Diagnostic Testing and Troubleshooting

Servicing Surface-Mount 5-3. Error 5-4. General Troubleshooting 5-5. Power Supply 5-6. Raw DC 5-7. 5-Volt Switching 5-9. Analog 5-10. Uart 5-11. DC Volts 5-12. AC Volts 5-13. Ohms 5-14. Digital 5-15. Display Assembly 5-16. Calibration 5-17. 5-18. Calibration-Related 5-19. Calibration 5-20. Retrieving Calibration 5-21. Replacing the EEROM

430 Alternate Ohms Calibration Computer Interface

This procedure can be used with discrete resistor values (such as a decade box). On the 300 W range, this alternate procedure uses a 290 W source and yields a specification of 0.05.+2 digits +0.02 W. Alternate calibration of this range is detailed below, although discrete resistor values can be used for all ranges. Lead and source zero resistances are only taken into account for the lowest two ranges (300 W and 3 kW). 1. Add the value of lead and source zero resistance to the certified value of...

429 Concluding Calibration Using the Computer Interface

At the conclusion of this type of calibration, first make sure the source is cleared. Then press the Cal Enable button on the meter to exit calibration mode. Calibration mode can also be exited at any time by sending the *RST command. If this command is sent prior to completion of all calibration points for the selected function, no changes are made to nonvolatile calibration memory for that function. If calibration mode is exited after completion of calibration of any function except VDC,...

426 Ohms Calibration Computer Interface

If you do not have the value resistors (290 W, 2.9 kW, 29 kW, 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 W, 1.9 kW, 19 kW, 190 kW, and 1.9 MW. If you are using an ohms calibrator without active 2-wire compensation, take a zero ohms measurement before entering calibration mode. Use the test leads that...

55 Power Supply Troubleshooting

With the meter off (but connected to line power), check for approximately 16 V dc (at 120 V ac line voltage) between the ground test point and the cathode of either A1CR2 or A1CR3. If necessary, check for transformer secondary voltage of approximately 24 V ac. With the meter on, check for 19 V dc from A1U11, pin 8 to the ground test point. This voltage is approximately 5 volts greater than the raw supply voltage when the switching supply is operating properly. The controller IC, A1U11, starts...

233 Serial Communication Guard Crossing

The Microprocessor communicates with the Analog Measurement Processor using this isolated two-wire, full-duplex asynchronous interface circuit. When the Microprocessor is transmitting to the Analog Measurement Processor, the transmit data bits appear at A1U6-11, which drives the combination of AQ19, A1R33 and A1U3-1. The optocoupler A1U3 then optically transfers this information to its output circuit, comprised of A1U3-7, A1R30, A1R28 and A1R27. The transmitted data is then presented to A1TP4...

46 Entering Calibration Mode

Always begin the calibration procedure as follows 1. Allow the Fluke 45 to stabilize in an environment with ambient temperature of 18 to 28 C and relative humidity of less than 70 . Then turn the Fluke 45 on, and allow it to warm up for at least 1 hour. 2. The Cal Enable button is located on the right side of the display and is recessed beneath a calibration seal. Enable the calibration mode by pressing the Cal Enable button for about three seconds (CAL appears in secondary display.) Use a...

21 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. Signal names followed by a '*' are active (asserted) low. Signal names not so marked are active high. Refer to Figure 2-1, Overall Functional Block Diagram, during the...

518 Calibration Related Components

Measurement function calibration depends on various combinations of components in and around the Analog Measurement Processor. The major components are Divider Network (DC Ohms) A1Z1 Integrate Resistors, Reference Divider A1Z3 Calibration of the Fluke 45 utilizes a building block approach individual components are calibrated separately and the appropriate calibration building blocks are assembled later for correction of any particular measurement function, range, and rate. Calibration steps are...

218 Analog Measurement Processor

Refer to Figure 2-2 for an overall picture of the Analog Measurement Processor chip and its peripheral circuits. Table 2-1 describes Analog Measurement Processor chip signal names. The Analog Measurement Processor (A1U1) is a 68-pin CMOS device that, under control of the Main Processor (A1U6), performs the following functions Active filtering of dc-type measurements. The active filter is disabled for fast reading rate measurements. Support for direct volts, direct current, true rms alternating...

13 Options and Accessories

These options can be installed either at the factory or in the field. The following discussions pertain to the field-installable option kits The Battery Kit (Option -01K) consists of a rechargeable, 8 V, lead-acid battery, with battery bracket and charger assembly. The battery has a typical operating time of eight hours and is fully operable at ambient temperatures between 0 and 50 C. The IEEE-488 Interface Kit (Option -05K) consists of a printed circuit assembly,...

241 Display Assembly

Display Assembly operation classified into six functional circuit blocks the Main Assembly Connector, the Front Panel Switches, the Display, the Beeper Drive Circuit, the Watchdog Timer Reset Circuit, and the Display Controller. These blocks are described in the following paragraphs. The Main Assembly Connector is a 20-pin connector (A2J1) that provides the interface between the Main Assembly and the other functional blocks on the Display Assembly. Seven of the connector pins provide the...

220 Input Signal Conditioning

The input signal (voltage, current, or resistance) must be scaled or conditioned to a form that can be measured by the a d converter. High dc voltage levels must be attenuated. Resistances, currents, and ac voltages must be converted to a representative dc voltage. DC-type measurements (dc volts, dc current, ohms, and diode test) are then filtered by the active filter. AC measurements (ac volts and ac current) are passively filtered after being converted to a dc voltage. In the medium and fast...

14 Organization of the Service Manual

This manual focuses on component-level repair of the Fluke 45 Dual Display Multimeter. To that end, manual chapters are often interdependent effective troubleshooting may require not only reference to the troubleshooting procedures in Chapter 5, but also some understanding of the detailed Theory of Operation in Chapter 2 and some tracing of circuit operation in the Schematic Diagrams presented in Chapter 9. Often, scanning the table of contents will yield an appropriate place to start using the...

54 General Troubleshooting Procedures

The Fluke 45 allows for some fault isolation using self-diagnostic routines and descriptive error codes. 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. Disconnect the IEEE-488 Interface Option at P2 and P3 on the IEEE-488 Interface PCA. If...

44 Front Panel Calibration

The Fluke 45 features closed-case calibration using known reference sources. The multimeter automatically prompts you for the required reference sources, measures them, calculates correction factors, and stores the correction factors in the nonvolatile calibration memory. Closed-case calibration has many advantages. There are no parts to disassemble, no mechanical adjustments to make, and the Fluke 45 can be calibrated by an automated instrumentation system. The Fluke 45 should normally be...

43 Performance Tests

The following performance tests are provided to ensure that the meter is in proper operating condition. If the meter fails any of the performance tests, calibration adjustment and or repair is needed. To perform these tests, you will need a Fluke 5700A Multifunction Calibrator and a 5725A Amplifier or equipment meeting the minimum specifications given in Table 4-1. Each of the measurements listed in the following steps assumes the meter is being tested after a one-hour warmup in an environment...

418 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. For RS-232 interface operation, use the following procedure from the front panel 2. Use ( B or to scroll to the desired baud rate. Then press (auto) to select the displayed rate. 3. Use ( B or to scroll to the desired parity (E for even, Odd for odd, or no for none.) Then press (auto) to select the...

410 DC and AC Milliamp Calibration Front Panel

Perform the dc and ac milliamps calibration as follows 1. If the meter is already in calibration mode, press the ( B or button to select mA DC calibration. Otherwise, select calibration mode first (press Cal Enable button for three seconds), then select mA DC calibration by pressing the ( button twice. 2. Connect the dc milliamps source to the 100 mA and COM inputs. 3. Apply the dc milliamp outputs indicated in Table 4-5 (steps 18 and 19), and calibrate the meter with the A button. 4. Press the...

214 Power Supply Circuit Description

The Power Supply consists of the following three functional sections The Raw DC Supply converts line voltage (90 V to 264 V ac) to a dc output of 7.5 V The 5 V Switching Supply converts the Raw DC Supply output to 5.1 V 0.25 V dc. Using the 5 V Switching Supply output, the Inverter generates the -30 V dc, -5 V dc, and 5 V ac supply levels needed for the vacuum-fluorescent display. Also, the Inverter provides isolated positive and negative 5.25 V outputs for the in-guard circuitry. The Raw DC...

Multimeter Gmt-19a - Schematic Diagram

Tektronix 465 Interface Circuit Board

ALL RESI STANCE I S I N OHMS. 2. ALL CAPACI TANCE IS IN M CRO FARADS. Z1 < Z1 s Z1 < Z1 5 Z1 5 Z1 > 10K> 10K> 10K> 10K> 10K> 10K 1. PILL RESISTANCES ARE IN OHMS,1 8 UIFITT ,+ -5* . 2. PILL CAPACITANCES ARE IN MICROFARADS. Figure 9-3. A1A1 True rms PCA (cont) Figure 9-5. A5 IEEE-488 Interface PCA 1. ALL RESISTANCES ORE IN OHMS, 1 8LIATT , + -5x . 2. ALL CAPACITANCES ARE IN MICROFARADS. DRU m5fp nrfp m3rc norc ifc ifc ren ren gnd ucc 75161...

Option 01 Battery Pack

Cycle Float Charge Rate 7-5 7-7. Low Battery Indicator 7-5 7-9. Constant Voltage Trickle 7-6 7-16. Low Battery Indicator Detector and Low Battery Disconnect Test 7-10 7-17. Cycle Float Charge Rate Switch 7-10 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. The Battery Pack Option PCA consists of the five functional blocks illustrated in...

421 The Calibration Procedure

Now select calibration mode on the Fluke 45. Using a thin, blunt-tipped object, press the recessed Cal Enable button for three seconds. Avoid using sharp objects that might damage this button. Refer to Table 4-8 for brief descriptions of calibration mode commands. The CALREF xxx.xx command tells the Fluke 45 to change the calibration prompt to the exact value of the input from the calibrator. Use of this command is equivalent to the act of editing the calibration prompt from the front panel...

515 Display Assembly Troubleshooting

Display A2ds1

The following discussion is helpful if it has been determined that the Display Assembly is faulty. This initial determination may not be arrived at easily, since an improperly operating display may be the result of a hardware or software problem that is not a direct functional part of the Display Assembly. Consult the General Troubleshooting Procedures found earlier in this chapter for procedures to isolate the fault to the Display Assembly. Use the following discussion of display software...

Theory of Operation

Functional Block Description 2-3 2-8. Serial Communication Guard Crossing 2-3 2-11. IEEE-488 Interface Option 2-5 2-7 2-11 2-12 2-15 2-15 2-15 2-15 2-33. Serial Communication Guard Crossing 2-18 2-19 2-19 2-20 2-21 2-46. Watchdog Timer and Reset 2-21 2-47. Display Controller with 2-22

7

Battery Pca 825885

Remove the two 6-32 x 1 4 panhead Phillips screws securing the Battery Pack Option see Figure 7-4 . 5. Carefully slide the Battery Pack Option out of the meter as shown in Figure 7-4 . Do not pinch the wires running from the circuit board to the battery terminals. To prevent damage to the meter when servicing the Main PCA, unplug the battery pack ribbon cable at the Main PCA or disconnect the wires to the battery pack. Use the following instructions to install the Battery Kit Option. Refer...

Option 05IEEE488 Interface

Removing the IEEE-488 Interface 8-8 8-12. Installing the IEEE-488 Interface 8-9 8-17. Failure to Select IEEE-488 Interface Option 8-10 8-18. Failure to Handshake on IEEE-488 8-11 8-20. Failure to Receive Multiple Character Commands 8-12 8-21. Failure to Transmit Query 8-12 8-22. Failure to Generate an End or Identify EOI 8-12 8-23. Failure to Generate a Service Request SRQ 8-12 The IEEE-488 Interface turns the Fluke 45 into a fully programmable instrument for use with the IEEE Standard...

53 Error Codes

Wiring Connection Fluke 2680a

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. Several of these error codes might never be displayed. Certainly, errors 4 and 5, which signify a faulty or dead display, could not be reported in the normal displayed manner. Other errors might not appear on the display. Therefore,...

Fluke 45 848205

Fluke Service Manual

The following pages give detailed listings of Fluke 45 parts. This instrument may contain a Nickel-Cadmium battery. Do not mix with the solid waste stream. Spent batteries should be disposed of by a qualified recycler or hazardous materials handler. Contact your authorized Fluke service center for recycling information. CONN ACC,D-SUB,FEMALE SCREWLOCK,.250 CABLE ASSY,FLAT,20 COND,MICROMOD,2 IN CORD,LINE,5-15 IEC,3-18AWG,SVT,7.5 FT 1. For 250 V order part number 769422. SOCKET,IC,28 PIN,DUAL...

List of Figures

Analog Simplified Schematic 2-3. DC Volts 300 V Range Simplified 2-4. Ohms Simplified 2-5. AC Buffer Simplified 2-6. DC mA and Amps Simplified 2-7. Active Filter Simplified 2-8. A D Converter Simplified Schematic 2-9. Command Byte Transfer 2-10. Grid Control Signal 2-11. Grid-Anode Timing 3-1. Replacing the Line Fuse 3-2. Replacing the External 100 mA Input Fuse 3-3. Removing the Case 3-4. Removing the Handle and Handle Mounting 3-5. Assembly 4-1. Four Wire...