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Fluke 123 Service Manual

Industrial scopemeter
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Fluke 123/124/125
Industrial ScopeMeter
Service Manual
4822 872 05398
March 2007
© 2007 Fluke Corporation, All rights reserved.
All product names are trademarks of their respective companies.

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Summary of Contents for Fluke 123

  • Page 1 ® Fluke 123/124/125 Industrial ScopeMeter Service Manual 4822 872 05398 March 2007 © 2007 Fluke Corporation, All rights reserved. All product names are trademarks of their respective companies.

  • Page 2: Limited Warranty & Limitation Of Liability

    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 three years for the Analyzer and one year for its accessories. The warranty period begins on the date of shipment.

  • Page 3: Table Of Contents

    2.3.3 Advanced Meter Functions ................. 2-9 2.4 Cursor Readout (Fluke 124, 125)..............2-10 2.5 Harmonics Measurements (Fluke 125) ............2-10 2.6 Field Bus Measurements (Fluke 125) ............2-11 2.7 Miscellaneous ....................2-11 2.8 Environmental....................2-12 2.9 Service and Maintenance ................2-13 2.10 Safety ......................
  • Page 4 3.5.12 Input A and B Volts Peak Measurements Test ......... 3-20 3.5.13 Input A and B Phase Measurements Test ..........3-21 3.5.14 Harmonics (Fluke 125) ................3-21 3.5.15 Input A and B High Voltage AC/DC Accuracy Test........ 3-22 3.5.16 Resistance Measurements Test ..............3-24 3.5.17 Continuity Function Test ................
  • Page 5 Contents (continued) Disassembling the Test Tool ................5-1 5.1. Introduction....................5-3 5.2. Disassembling Procedures ................5-3 5.1.1 Required Tools.................... 5-3 5.2.2 Removing the Battery Pack ................ 5-3 5.2.3 Removing the Bail ..................5-3 5.2.4 Opening the Test Tool ................5-3 5.2.5 Removing the Main PCA Unit..............5-5 5.2.6 Removing the Display Assembly..............
  • Page 7 List of Tables Table Title Page 2-1.No Visible Trace Disturbance ..............2-15 2-2.Trace Disturbance < 10% ................2-15 2-3.Multimeter Disturbance < 1%..............2-15 3-1.Input A,B Frequency Measurement Accuracy Test ........3-10 3-2.Volts DC Measurement Verification Points ..........3-17 3-3.Volts AC Measurement Verification Points ..........3-19 3-4.Input A and B AC Input Coupling Verification Points.......3-20 3-5.Volts Peak Measurement Verification Points ..........3-21 3-6.Phase Measurement Verification Points............3-21 3-7.V DC and V AC High Voltage Verification Tests........3-24...
  • Page 8 Fluke 123/124/125 Service Manual 4-3.Volt Gain Calibration Points <300V ............4-11 4-4.Ohm Gain Calibration Points ..............4-13 6-1.Final Assembly Parts...................6-4 6-2.Main PCA Unit ....................6-6 6-3.Standard Accessories .................6-7 6-4.Optional Accessories ..................6-8...
  • Page 9 List of Figures Figure Title Page 2-2.Max. Input Voltage v.s. Frequency for VP40 10:1 Voltage Probe ....2-14 3-1.Display Pixel Test Pattern ................3-5 3-2.Menu item selection..................3-6 3-3.Test Tool Input A to 5500A Scope Output 50Ω .........3-8 3-4.Test Tool Input B to 5500A Scope Output 50Ω .........3-10 3-5.Test Tool Input A-B to 5500A Normal Output..........3-13 3-6.Bargraph Harmonics Ampere ..............3-22 3-7.Bargraph Harmonics Volt................3-22...
  • Page 10 4-6. Volt Gain Calibration Input Connections <300V ........4-11 4-7.Volt Gain Calibration Input Connections 500V..........4-12 4-8.Four-wire Ohms calibration connections ..........4-13 4-9.Capacitance Gain Calibration Input Connections........4-14 5-1.Fluke 123 Main Assembly ................5-4 5-2.Flex Cable Connectors ................5-5 5-3.Main PCA Unit Assembly ................5-7 5-4.Mounting the display shielding bracket ............5-9 6-1.Fluke 123 Final Assembly ................6-5...
  • Page 11 Chapter 1 Introduction and Safety Instructions Title Page 1.1 Introduction to Service Manual ..............1-3 1.2 Safety ......................1-3 1.2.1 Introduction....................1-3 1.2.2 Safety Precautions..................1-3 1.2.3 Caution and Warning Statements..............1-3 1.2.4 Symbols used in this Manual and on Instrument ........1-4 1.2.5 Impaired Safety...................

  • Page 13: Introduction To Service Manual

    Chapter 4. Calibration Adjustment. Chapter 5. Disassembling the test tool. Chapter 6. List of Replaceable Parts. Important. The Main PCA in this test tool is only available to Fluke Service Centers due to the programming that is necessary after installation. 1.2 Safety 1.2.1 Introduction...

  • Page 14: Symbols Used In This Manual And On Instrument

    Components which are important for the safety of the instrument may only be replaced by components obtained through your local FLUKE organization. These parts are indicated with an asterisk (*) in the List of Replaceable Parts, Chapter 6.
  • Page 15 2.3.3 Advanced Meter Functions ................. 2-9 2.4 Cursor Readout (Fluke 124, 125)..............2-10 2.5 Harmonics Measurements (Fluke 125) ............2-10 2.6 Field Bus Measurements (Fluke 125) ............2-11 2.7 Miscellaneous ....................2-11 2.8 Environmental....................2-12 2.9 Service and Maintenance ................2-13 2.10 Safety ......................

  • Page 17: Characteristics

    2.1 Introduction 2.1 Introduction Performance Characteristics FLUKE guarantees the properties expressed in numerical values with the stated tolerance. Specified non-tolerance numerical values indicate those that could be nominally expected from the mean of a range of identical ScopeMeter test tools.

  • Page 18: Horizontal

    Normal & Single mode 2.2.2 Horizontal Normal, Single, Roll Scope Modes Ranges Normal: equivalent sampling (Fluke 123) 20 ns to 500 ns/div equivalent sampling (Fluke 124, 125) 10 ns to 500 ns/div 1 μs to 5 s/div real time sampling 1 μs to 5 s/div...

  • Page 19: Advanced Scope Functions

    2.3 Dual Input Meter A, B, EXT Source EXTernal via optically isolated trigger probe ITP120 (optional accessory) Sensitivity A and B (Fluke 123) @ DC to 5 MHz 0.5 divisions or 5 mV @ 25 MHz 1.5 divisions @ 40 MHz...
  • Page 20 Full Scale Reading 500 counts Frequency (Hz) Ranges 1Hz, 10Hz, 100Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz, 10 MHz, and 50 MHz (Fluke 123) or 70 MHz (Fluke 124, 125). Frequency Range for Continuous Autoset 15Hz (1Hz) to 50 MHz...
  • Page 21 @1Hz to 1 MHz ±(1.0% +2 counts) @1 MHz to 10 MHz ±(2.5% +2 counts) @10 MHz to 50 MHz (Fluke 123) ±(2.5% +2 counts) @10 MHz to 70 MHz (Fluke 124, 125) (50 MHz in Autorange) Full Scale Reading...

  • Page 22: Input A

    Accuracy as Vrms for sinewave signals 2.3.2 Input A Ohm (Ω) Ranges 50Ω (Fluke 125), 500Ω, 5 kΩ, 50 kΩ, 500 kΩ, 5 MΩ, 30 MΩ ±(0.6% +5 counts) Accuracy Full Scale Reading 500Ω to 5 MΩ 5000 counts 30 MΩ...

  • Page 23: Advanced Meter Functions

    Characteristics 2.3 Dual Input Meter Open Circuit Voltage <4V Continuity (CONT) 30Ω ± 5Ω in 50Ω range Beep Measurement Current 0.5 mA ≥1 ms Detection of shorts of Diode Maximum Voltage: @0.5 mA >2.8V @open circuit <4V ±(2% +5 counts) Accuracy Measurement Current 0.5 mA...

  • Page 24: Cursor Readout (Fluke 124, 125)

    Fluke 123/124/125 Service Manual 2.4 Cursor Readout (Fluke 124, 125) Sources Single Vertical Line Average, Min and Max Readout. Average, Min, Max and Time from Start of Readout (in ROLL mode, instrument in HOLD). Min, Max and Time from Start of Readout (in TRENDPLOT mode, instrument in HOLD).

  • Page 25: Field Bus Measurements (Fluke 125)

    Characteristics 2.6 Field Bus Measurements (Fluke 125) 2.6 Field Bus Measurements (Fluke 125) Type Subtype Protocol AS-i NEN-EN50295 ISO-11898 Interbus S RS-422 EIA-422 ControlNet 61158 type 2 Modbus RS-232 RS-232/EIA-232 RS-485 RS-485/EIA-485 Foundation 61158 type 1, 31.25 kBit Fieldbus 61158 type 1 ≤ 10 Mbit...

  • Page 26: Environmental

    Fluke 123/124/125 Service Manual Memory Number of Screen + Setup Memories Fluke 123 Fluke 124 Number of Data Set memories Fluke 125 Mechanical Size 232 x 115 x 50 mm (9.1 x 4.5 x 2 in) Weight 1.2 kg (2.5 lbs), including battery pack.

  • Page 27: Service And Maintenance

    Characteristics 2.9 Service and Maintenance MIL28800F, Class 2, 3.8.8.2 & 4.5.6.2.2. Salt Exposure Structural parts meet 48 hours 5% salt solution test. Electromagnetic Compatibility (EMC) Emission EN 50081-1 (1992): EN55022 and EN60555-2 Immunity EN 50082-2(1992): IEC1000-4-2, -3, -4, - 5 (see also Section 2.9, Tables 2-1 to 2-3) IP51, ref: IEC529 Enclosure Protection 2.9 Service and Maintenance...
  • Page 28 Fluke 123/124/125 Service Manual Figure 2-2. Max. Input Voltage v.s. Frequency for VP40 10:1 Voltage Probe 2-14...

  • Page 29: Emc Immunity

    Characteristics 2.11 EMC Immunity 2.11 EMC Immunity The Fluke 123/124/125, including standard accessories, conforms with the EEC directive 89/336 for EMC immunity, as defined by IEC1000-4-3, with the addition of tables 2-1 to 2-3. See Table 2-1 and Table 2-2.
  • Page 30 Fluke 123/124/125 Service Manual 2-16...

  • Page 31: Performance Verification

    3.5.12 Input A and B Volts Peak Measurements Test ......... 3-20 3.5.13 Input A and B Phase Measurements Test ..........3-21 3.5.14 Harmonics (Fluke 125) ................3-21 3.5.15 Input A and B High Voltage AC/DC Accuracy Test........ 3-22 3.5.16 Resistance Measurements Test ..............3-24 3.5.17 Continuity Function Test ................

  • Page 33: Introduction

    PM9093/001 Male BNC to Dual Female BNC Adapter Note: if you have a Fluke 5500A with 600 MHz Oscilloscope Option, you do not require a separate TV Signal Generator, a 75Ω Coax cable, a 75Ω Feed through termination, and a...

  • Page 34: How To Verify

    Some of the tests are slightly different for Fluke 123, 124, and Fluke 125. This is caused by the higher vertical and trigger bandwidth in Fluke 124 and 125. Moreover Fluke 125 has extra measuring functions and a slightly different way of operation.

  • Page 35: Input A And Input B Tests

    Performance Verification 3.5 Input A and Input B Tests visible or hardly visible. Observe the display closely, and verify that no light pixels are shown. Figure 3-1. Display Pixel Test Pattern 11. Press Contrast (CL 0110):MANUAL The test pattern is removed; the test tool shows 12.

  • Page 36: Input A And B Base Line Jump Test

    Fluke 123/124/125 Service Manual ST7968.WMF Figure 3-2. Menu item selection . Not selected items are marked by □ If a selected If an item is selected, it is marked by item is highlighted, an then is pressed, the item remains selected.
  • Page 37 ( in top of display). AUTO MANUAL toggles between ranging). • Fluke 123/124: press to open the SCOPE INPUTS menu. • Fluke 123/124: press to open the SCOPE OPTIONS menu, and choose : SCOPE MODE: NORMAL | WAVEFORM MODE: SMOOTH •...

  • Page 38: Input A Trigger Sensitivity Test

    The trigger level is indicated by the trigger icon ( ). 6. Set the 5500A to source a 25 MHz (Fluke 123) or 40 MHz (Fluke 124/125) leveled sine wave of 400 mV peak-to-peak.

  • Page 39: Input A Frequency Response Upper Transition Point Test

    Performance Verification 3.5 Input A and Input B Tests 9. Set the 5500A to source a 40 MHz (Fluke 123) or 60 MHz (Fluke 124/125) leveled sine wave of 1.8V peak-to-peak. 10. Adjust the amplitude of the sine wave to 4 divisions on the test tool display.

  • Page 40: Input B Frequency Measurement Accuracy Test

    10 MHz 09.88 to 10.12 MHz 40 MHz 38.98 to 41.02 MHz 60 MHz (Fluke 124/125 only) 58.48 to 61.52 MHz Note Duty Cycle and Pulse Width measurements are based on the same principles as Frequency measurements. Therefore the Duty Cycle and Pulse Width measurement function will not be verified separately.

  • Page 41: Input B Frequency Response Upper Transition Point Test

    MODE levsine). Set the 5500Ato Operate (OPR). 4. Adjust the amplitude of the sine wave to 6 divisions on the test tool display. 5. Set the 5500A to 20 MHz (Fluke 123) or 40 MHz (Fluke 124/125), without changing the amplitude.

  • Page 42: Input B Trigger Sensitivity Test

    The trigger level is indicated by the trigger icon ( ). 6. Set the 5500A to source a 25 MHz (Fluke 123) or 40 MHz (Fluke 124/125) leveled sine wave of 400 mV peak-to-peak.

  • Page 43: Input A And B Trigger Level And Trigger Slope Test

    Using change the time base to select manual time base ranging, and lock the time base on 10 ms/div. • Fluke 123/124: press to open the SCOPE INPUTS menu. • Fluke 123/124: press to open the TRIGGER menu, and choose:...
  • Page 44 +2 divisions from the screen center. For positive slope triggering, the trigger level is the top of the trigger icon ( ). • Fluke 123/124: press to open the SCOPE INPUTS menu. • Fluke 123/124: press...
  • Page 45 Performance Verification 3.5 Input A and Input B Tests 18. Select the following test tool setup: • Fluke 123/124: press to open the SCOPE INPUTS menu. • Fluke 123/124: press to open the TRIGGER menu, and choose: INPUT: A | SCREEN UPDATE: FREE RUN | AUTO RANGE: >15Hz...

  • Page 46: Input A And B Dc Voltage Accuracy Test

    Using change the time base to select manual time base ranging, and lock the time base on 10 ms/div. • Fluke 123/124: press to open the SCOPE INPUTS menu. • Fluke 123/124: press to open the SCOPE OPTIONS menu, and choose :...
  • Page 47 Performance Verification 3.5 Input A and Input B Tests 6. Continue through the test points. 7. When you are finished, set the 5500A to 0 (zero) Volt, and to Standby. Table 3-2. Volts DC Measurement Verification Points Sensitivity Range 5500A output, Input A-B DC Reading (Oscilloscope) (Meter)

  • Page 48: Input A And B Ac Voltage Accuracy Test

    Fluke 123/124/125 Service Manual 3.5.10 Input A and B AC Voltage Accuracy Test Warning Dangerous voltages will be present on the calibration source and connecting cables during the following steps. Ensure that the calibrator is in standby mode before making any connection between the calibrator and the test tool.

  • Page 49: Input A And B Ac Input Coupling Test

    Use the setup of the previous step (AUTO time base, traces at vertical center). • Using select 200 mV/div for Input A and B (500 mV range). • Fluke 123/124: press to open the SCOPE INPUTS menu, and choose: INPUT A: AC | NORMAL | INPUT B: AC | NORMAL •...

  • Page 50: Input A And B Volts Peak Measurements Test

    Proceed as follows to test the Volts Peak measurement function: 1. Connect the test tool to the 5500A as for the previous test (see Figure 3-5). 2. Select the following test tool setup: • Fluke 123/124: press to open the SCOPE INPUTS menu. • Fluke 123/124: press...

  • Page 51: Input A And B Phase Measurements Test

    5. Continue through the test points. 6. When you are finished, set the 5500A to Standby. Table 3-6. Phase Measurement Verification Points 5500A output, Vrms (sine) 5500A Frequency Reading A-B 1.5V 1 kHz -2 to +2 Deg 3.5.14 Harmonics (Fluke 125) Proceed as follows: 3-21...

  • Page 52: Input A And B High Voltage Ac/Dc Accuracy Test

    Fluke 123/124/125 Service Manual 1. Connect the test tool to the 5500A as for the previous test (see Figure 3-5). 2. Press to open MENU. 3. Operate the keys to highlight HARMONICS. 4. Press to open the B AMPERE PROBE menu, and choose:...
  • Page 53 Performance Verification 3.5 Input A and Input B Tests ST8129.WMF Figure 3-8. Test Tool Input A-B to 5500A Normal Output for >300V 2. Select the following test tool setup: • AUTO Press to select auto ranging ( in top of display). Do not press anymore! •...

  • Page 54: Resistance Measurements Test

    Fluke 123/124/125 Service Manual 7. When you are finished, set the 5500A to Standby Table 3-7. V DC and V AC High Voltage Verification Tests Sensitivity Range 5500A 5500A Main (DC) Secondary (AC) (Scope) (Meter) output Vrms Frequency Reading A-B...

  • Page 55: Continuity Function Test

    Performance Verification 3.5 Input A and Input B Tests • Press to open the INPUT A MEASUREMENTS menu, and choose: OHM Ω MEASURE on A: 3. Set the 5500A to the first test point in Table 4-8. Set the 5500A to Operate (OPR). Use the 5500A “COMP 2 wire”...

  • Page 56: Diode Test Function Test

    • Press to open the INPUT A MEASUREMENTS menu. • Fluke 123/124: press to select the METER A OPTIONS MENU, and choose: SMOOTHING: NORMAL | ZERO REF: The ZERO REF function is used to eliminate the capacitance of the test leads.

  • Page 57: Video Trigger Test

    (see steps 7...10) 3.5.20 Video Trigger Test This test is based upon use of a TV signal generator. If you have a Fluke 5500A Calibrator with 600 MHz Oscilloscope Option, there is no need to use a separate TV signal generator.
  • Page 58 Figure 3-10. Test Tool Input A to TV Signal Generator 2. Select the following test tool setup: • Reset the test tool (power off and then on with • Fluke 123/124: press to open the SCOPE INPUTS menu. • Fluke 123/124: Press to open the TRIGGER menu and choose: VIDEO on A...
  • Page 59 Performance Verification 3.5 Input A and Input B Tests 3. Set the TV Signal Generator to source a signal with the following properties: • the system selected in step 2 • gray scale • video amplitude 1V (5 divisions on the test tool) •...
  • Page 60 7. Apply the inverted TV Signal Generator signal to the test tool. You can invert the signal by using a Banana Plug to BNC adapter (Fluke PM9081/001) and a Banana Jack to BNC adapters (Fluke PM9082/001), as shown in Figure 3-15.
  • Page 61 Performance Verification 3.5 Input A and Input B Tests • Fluke 125: press to open the TRIGGER menu and choose: VIDEO on A The VIDEO TRIGGER sub-menu is shown now. From the VIDEO TRIGGER menu choose: SYSTEM: NTSC SECAM PALplus | •...
  • Page 63 Chapter 4 Calibration Adjustment Title Page 4.1 General......................4-3 4.1.1 Introduction....................4-3 4.1.2 Calibration number and date............... 4-3 4.1.3 General Instructions ..................4-3 4.2 Equipment Required For Calibration............. 4-4 4.3 Starting Calibration Adjustment ..............4-4 4.4 Contrast Calibration Adjustment ..............4-6 4.5 Warming Up &...

  • Page 65: Calibration Adjustment

    4.1.1 Introduction The following information, provides the complete Calibration Adjustment procedure for the test tools Fluke 123 and 124 with firmware V02.00 and onwards and for Fluke 125. The test tool allows closed-case calibration using known reference sources. It measures the reference signals, calculates the correction factors, and stores the correction factors in RAM.

  • Page 66: Equipment Required For Calibration

    Service Manual 4.2 Equipment Required For Calibration The primary source instrument used in the calibration procedures is the Fluke 5500A. If a 5500A is not available, you can substitute another calibrator as long as it meets the minimum test requirements.
  • Page 67 Calibration Adjustment 4.3 Starting Calibration Adjustment 4. Continue with either a. or b. below: a. To calibrate the display contrast adjustment range and the default contrast, go to Section 4.4 Contrast Calibration Adjustment. This calibration step is only required if the display cannot made dark or light enough, or if the display after a test tool reset is too light or too dark.

  • Page 68: Contrast Calibration Adjustment

    Fluke 123/124/125 Service Manual 4.4 Contrast Calibration Adjustment After entering the Maintenance mode, the test tool display shows Warming Up (CL 0200):IDLE (valid) Do not press now! If you did, turn the test tool off and on, and enter the Maintenance mode again.

  • Page 69: Warming Up & Pre-Calibration

    Calibration Adjustment 4.5 Warming Up & Pre-Calibration 4.5 Warming Up & Pre-Calibration After entering the Warming-Up & Pre-Calibration state, the display shows: WarmingUp (CL 0200):IDLE (valid) (invalid) You must always start the Warming Up & Pre Calibration at Warming Up (CL0200) Starting at another step will make the calibration invalid! Proceed as follows: 1.
  • Page 70 Fluke 123/124/125 Service Manual 3. Set the 5500A to source a 1 kHz fast rising edge square wave (Output SCOPE, MODE edge) to the first calibration point in Table 4-1. 4. Set the 5500A in operate (OPR). 5. Press to start the calibration.

  • Page 71: Delta T Gain, Trigger Delay Time & Pulse Adjust Input A

    Calibration Adjustment 4.6 Final Calibration Table 4-2. HF Gain Calibration Points Slow Cal step 5500A Setting Test Tool Input Signal (1 kHz, MODE Requirements <2 μs, wavegen, (1 kHz square, t rise WAVE square) flatness after rising edge: <0.5% after 4 μs) HF-Gain AB (CL 0609) HF-Gain A (CL 0612), HF-Gain B (CL 0632)

  • Page 72: Pulse Adjust Input B

    Fluke 123/124/125 Service Manual 4.6.3 Pulse Adjust Input B Proceed as follows to do the Pulse Adjust Input A calibration: 1. Press to select calibration step Pulse Adj B (CL 0660):IDLE 2. Connect the test tool to the 5500A as shown in Figure 4-5.
  • Page 73 Calibration Adjustment 4.6 Final Calibration ST8001.WMF Figure 4-6. Volt Gain Calibration Input Connections <300V 3. Set the 5500A to supply a DC voltage, to the first calibration point in Table 4-3. 4. Set the 5500A to operate (OPR). 5. Press to start the calibration.

  • Page 74: Volt Zero

    Fluke 123/124/125 Service Manual 10. Connect the test tool to the 5500A as shown in Figure 4-7. ST8129.WMF Figure 4-7. Volt Gain Calibration Input Connections 500V 11. Set the 5500A to supply a DC voltage of 500V. 12. Set the 5500A to operate (OPR).

  • Page 75: Gain Ohm

    Calibration Adjustment 4.6 Final Calibration 4.6.7 Gain Ohm Proceed as follows to do the Gain Ohm calibration: 1. Press to select calibration adjustment step Gain Ohm (CL 0860):IDLE 2. Connect the UUT to the 5500A as shown in Figure 4-8. Notice that the sense leads must be connected directly to the test tool.

  • Page 76: Capacitance Gain Low And High

    Fluke 123/124/125 Service Manual 4.6.8 Capacitance Gain Low and High Proceed as follows to do the Capacitance Gain calibration: 1. Press to select calibration adjustment step Cap. Low (CL 0900):IDLE 2. Connect the test tool to the 5500A as shown in Figure 4-9.

  • Page 77: Capacitance Gain

    Calibration Adjustment 4.7 Save Calibration Data and Exit 4.6.10 Capacitance Gain Proceed as follows to do the Capacitance Gain calibration: 1. Press to select calibration adjustment step Cap. Gain (CL 0960):IDLE 2. Connect the test tool to the 5500A as shown in Figure 4-9 (Section 4.6.8). 3.
  • Page 78 Fluke 123/124/125 Service Manual Possible error messages. The following messages can be shown on the test tool display: WARNING.Calibration data NOT valid. Save data and EXIT? Proceed as follows: • To return to the Maintenance mode: ⇒ Press Now press...
  • Page 79 Chapter 5 Disassembling the Test Tool Title Page 5.1. Introduction....................5-3 5.2. Disassembling Procedures ................5-3 5.1.1 Required Tools.................... 5-3 5.2.2 Removing the Battery Pack ................ 5-3 5.2.3 Removing the Bail ..................5-3 5.2.4 Opening the Test Tool ................5-3 5.2.5 Removing the Main PCA Unit..............

  • Page 81: Disassembling The Test Tool

    Disassembling the Test Tool 5.1. Introduction 5.1. Introduction This section provides the required disassembling procedures. The printed circuit board removed from the test tool must be adequately protected against damage. Warning To avoid electric shock, disconnect test leads, probes and power supply from any live source and from the test tool itself.
  • Page 82 Fluke 123/124/125 Service Manual ST8014.EPS Figure 5-1. Fluke 123/124/125 Main Assembly...

  • Page 83: Removing The Main Pca Unit

    Disassembling the Test Tool 5.2. Disassembling Procedures 5.2.5 Removing the Main PCA Unit Referring to Figure 5-1, use the following procedure to remove the main PCA unit. 1. Open the test tool (see Section 5.2.4). 2. Disconnect the LCD flex cable, and the keypad foil flat cable, see Figure 5-2. Unlock the cables by lifting the connector latch.

  • Page 84: Removing The Display Assembly

    Fluke 123/124/125 Service Manual 5.2.6 Removing the Display Assembly Caution Read the Caution statement in Section 5.5 when installing the display assembly. An incorrect installation can damage the display assembly. There are no serviceable parts in the display assembly. Referring to Figure 5-1, use the following procedure to remove the display assembly.
  • Page 85 Disassembling the Test Tool 5.3 Disassembling the Main PCA Unit Note Each input banana jacket is provided with a rubber sealing ring (Input A,B item 9, COM input item 10). Ensure that the rings are present when reassembling the main PCA unit! Caution To avoid contaminating the main PCA with oil from your fingers, do not touch the contacts (or wear gloves).

  • Page 86: Reassembling The Main Pca Unit

    Fluke 123/124/125 Service Manual 5.4 Reassembling the Main PCA Unit Reassembling the main PCA is the reverse of disassembly. However you must follow special precautions when reassembling the main PCA unit. 1. Ensure the input banana jacks have the rubber sealing ring in place (Input A, B item 9, COM input item 10, see Figure 5-3).
  • Page 87 Disassembling the Test Tool 5.5 Reassembling the Test Tool 7. Clean the display glass with a moist soft cloth if necessary. Install the display assembly. Ensure that the display is secured correctly by the four alignment tabs in the top case. It is secured correctly when it cannot be moved horizontally. 8.
  • Page 88 Fluke 123/124/125 Service Manual 5-10...

  • Page 89: 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 Service Centers ....................6-3 6.4 Final Assembly Parts ..................6-4 6.5 Main PCA Unit Parts ..................6-6 6.6 Service Tools ....................6-7 6.7 Accessory Replacement Parts ................

  • Page 91: Introduction

    6.1 Introduction 6.1 Introduction This chapter contains an illustrated list of replaceable parts for the model 123, 124 or 125 ScopeMeter test tool. Parts are listed by assembly; alphabetized by item number or reference designator. Each assembly is accompanied by an illustration showing the location of each part and its item number or reference designator.

  • Page 92: Final Assembly Parts

    M3x10 5322 502 21507 bail 5322 466 10975 Main PCA unit for Fluke 123/124 or 125. The Main PCA in this Analyzer is only available to Fluke Service Centers due to the programming that is necessary after installation. Note The Test Tool contains a Rechargeable Ni-MH battery.
  • Page 93 List of Replaceable Parts 6.4 Final Assembly Parts ST8014.EPS Figure 6-1. Fluke 123/124/125 Final Assembly...

  • Page 94: Main Pca Unit Parts

    Fluke 123/124/125 Service Manual 6.5 Main PCA Unit Parts See Table 6-2 and Figure 6-2 for the Main PCA Unit parts. Table 6-2. Main PCA Unit Item Description Ordering Code screw M2.5x5 5322 502 21206 combiscrew M3x10 5322 502 21507...

  • Page 95: Service Tools

    5322 320 11354 One 10:1 Scope Probe VP40 VPS40 (is VP40 probe including hook clip and ground lead) AC Current Clamp 40 A / 400 A (Fluke 125) i400s Test Lead for Grounding (Black) TL75 (red + black lead) Set of two Hook Clips (Red and Gray)
  • Page 96 Fluke 123/124/125 Service Manual Table 6-4. Optional Accessories Description Model Number/Ordering Code Software & Cable Carrying Case Kit (Supplied with Fluke 123/S, SCC 120 124/S, 125/S) Set contains the following parts: Optically Isolated RS-232/USBAdapter/Cable OC4USB Hard Carrying Case. Supplied with Fluke 123/S, 124/S, 125/S C120 ®...

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