Fluke 123B/S Service Manual

Fluke 123B/S Manual

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  • Fluke 123B/S | Service Manual - Page 1
    123/124 Industrial ScopeMeter Service Manual 4822 872 05389 February 2003 © 2003 Fluke Corporation. All rights reserved. Printed in the Netherlands All product names are trademarks of their respective companies.
  • Fluke 123B/S | Service Manual - Page 2
    SERVICE CENTERS To locate an authorized service center, visit us on the World Wide Web: http://www.fluke.com or call Fluke using any of the phone numbers listed below: +1-888-993-5853 in U.S.A. and Canada +31-402-675-200 in Europe +1-425-446-5500 from other countries
  • Fluke 123B/S | Service Manual - Page 3
    Instructions 1-1 1.1 Introduction 1-3 1.2 Safety Precautions 1-3 1.3 Caution and Warning Statements 1-3 1.4 Symbols used in this Manual Meter Functions 2-9 2.4 Cursor Readout (Fluke 124 2-9 2.5 Miscellaneous 2-9 2.6 Environmental 2-11 2.7 Service and Maintenance 2-12 2.8 Safety ...2-12
  • Fluke 123B/S | Service Manual - Page 4
    123/124 Service Manual 3.2.5 Start-up Sequence, Operating Modes 3-7 3.3 Detailed Circuit Descriptions 3-9 3.3.1 Power Circuit 3-9 3.3.2 Channel A - Channel 5-3 5.1.2 Calibration number and date 5-3 5.1.3 General Instructions 5-3 5.2 Equipment Required For Calibration 5-4 5.3 Starting
  • Fluke 123B/S | Service Manual - Page 5
    Finding 7-4 7.3 Charger Circuit 7-4 7.4 Starting with a Dead Test Tool 7-6 7.4.1 Test Tool Completely Dead 7-6 7.4.2 Test Tool Software Does not Run 7-7 7.4.3 Software Runs, Test Tool not Operative 7-7 7.5 Miscellaneous Functions 7-8 7.5.1 Display and Back Light 7-8 7.5.2 Fly Back Converter
  • Fluke 123B/S | Service Manual - Page 6
  • Fluke 123B/S | Service Manual - Page 7
    Table Title Page 2-1.No Visible Trace Disturbance 2-14 2-2.Trace Disturbance < 10 2-14 2-3.Multimeter Disturbance < 1 2-14 3-1.Fluke 123 Main Blocks 3-3 3-2.Fluke 123 Operating Modes 3-9 3-3.Voltage Ranges And Trace Sensitivity 3-18 3-4.Ohms Ranges, Trace Sensitivity, and Current 3-18
  • Fluke 123B/S | Service Manual - Page 8
  • Fluke 123B/S | Service Manual - Page 9
    List of Figures Figure Title Page 2-2.Max. Input Voltage v.s. Frequency for VP40 10:1 Voltage Probe 2-13 3-1.Fluke 123 Block Diagram 3-2 3-2.Fluke 123 Start-up Sequence, Operating Modes 3-8 3-3.Power Supply Block Diagram 3-9 3-4.CHAGATE Control Voltage 3-12 3-5.Fly-Back Converter Current
  • Fluke 123B/S | Service Manual - Page 10
    123/124 Service Manual 5-6. Volt Gain Calibration Input Connections
  • Fluke 123B/S | Service Manual - Page 11
    Chapter 1 Safety Instructions Title Page 1.1 Introduction 1-3 1.2 Safety Precautions 1-3 1.3 Caution and Warning Statements 1-3 1.4 Symbols used in this Manual and on Instrument 1-3 1.5 Impaired Safety 1-4 1.6 General Safety Information 1-4 1-1
  • Fluke 123B/S | Service Manual - Page 12
  • Fluke 123B/S | Service Manual - Page 13
    1 Safety Instructions 1.1 Introduction 1.1 Introduction Read these pages carefully before essential that both operating and service personnel follow generally accepted safety procedures in addition to the safety precautions specified in this manual. Specific warning and caution statements,
  • Fluke 123B/S | Service Manual - Page 14
    123/124 Service Manual 1.5 Impaired Safety Whenever it is likely that safety has been impaired, 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
  • Fluke 123B/S | Service Manual - Page 15
    Scope Functions 2-5 2.3 Dual Input Meter 2-5 2.3.1 Input A and Input B 2-5 2.3.2 Input A 2-8 2.3.3 Advanced Meter Functions 2-9 2.4 Cursor Readout (Fluke 124 2-9 2.5 Miscellaneous 2-9 2.6 Environmental 2-11 2.7 Service and Maintenance 2-12 2.8 Safety ...2-12 2.9 EMC Immunity 2-14 2-1
  • Fluke 123B/S | Service Manual - Page 16
  • Fluke 123B/S | Service Manual - Page 17
    range of identical ScopeMeter test tools. Environmental Data The environmental data mentioned in this manual are based on DC to 12.5 MHz (-3 dB) DC to 20 MHz (-6 dB) with VP40 10:1 probe: Fluke 123 (optional accessory) Fluke 124 (standard accessory) DC to 20 MHz (-3 dB) DC to 40 MHz (-3 dB) AC
  • Fluke 123B/S | Service Manual - Page 18
    123/124 Service Manual Display Modes A, -A, B, -B Max. Input Voltage A and B Direct, with test leads, or with VP40 Probe 600 Vrms with BB120 300 Vrms (For detailed specifications , Roll Ranges Normal: equivalent sampling (Fluke 123) equivalent sampling (Fluke 124) real time sampling 20 ns
  • Fluke 123B/S | Service Manual - Page 19
    and B (Fluke 123) @ DC to 5 MHz @ 25 MHz @ 40 MHz Sensitivity A and B (Fluke 124) Manual override by user adjustment of amplitude, time base, or trigger level. 2.3 Dual Input Meter The accuracy of all measurements is within ± (% of reading + number of counts) from 18 °C to 28 °C. Add 0.1x (specific
  • Fluke 123B/S | Service Manual - Page 20
    123/124 Service Manual Full Scale Reading 5000 counts Move influence ±6 counts max. True RMS Voltages (VAC and VAC+DC) 1Hz, 10Hz, 100Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz, 10 MHz, and 50 MHz (Fluke 123) or 70 MHz (Fluke 124). Frequency Range for Continuous Autoset 15Hz (1Hz) to 50 MHz 2-6
  • Fluke 123B/S | Service Manual - Page 21
    2 Characteristics 2.3 Dual Input Meter Accuracy: @1Hz to 1 MHz @1 MHz to 10 MHz @10 MHz to 50 MHz (Fluke 123) @10 MHz to 70 MHz (Fluke 124) (50 MHz in Autorange) Full Scale Reading ±(0.5% +2 counts) ±(1.0% +2 counts) ±(2.5% +2 counts) ±(2.5% +2 counts) 10 000 counts Duty Cycle (DUTY) Range
  • Fluke 123B/S | Service Manual - Page 22
    123/124 Service Manual Full Scale Reading Phase Modes Range Accuracy Resolution 2.3.2 1 degree 500Ω, 5 kΩ, 50 kΩ, 500 kΩ, 5 MΩ, 30 MΩ ±(0.6% +5 counts) 5000 counts 3000 counts 0.5 mA to 50 nA decreases with increasing ranges 2.8V
  • Fluke 123B/S | Service Manual - Page 23
    Accuracy 2.5 Miscellaneous Display Size Resolution 2 Characteristics 2.4 Cursor Readout (Fluke 124) Set actual value to reference 1s @ 1µs to 10 and Peak-Peak Readout. Transition Time, 0%-Level and 100%Level Readout (Manual or Auto Leveling: Auto Leveling only possible in Single Channel Mode). As
  • Fluke 123B/S | Service Manual - Page 24
    123/124 Service Manual Waveform display: Vertical Horizontal Backlight Power External: Input Voltage Power Input Connector Internal Battery Pack BP120 (Fluke 123): Battery Power Operating Time Charging Time 8 divisions of 20 pixels 9.6 divisions of 25 pixels Cold Cathode Fluorescent (CCFL) via
  • Fluke 123B/S | Service Manual - Page 25
    Compatibility (EMC) Emission Immunity RS-232, optically isolated supports Epson FX, LQ, and HP Deskjet, Laserjet, and data. Serial via PM9080 (optically isolated RS232 adapter/cable, optional), using SW90W (FlukeView software for Windows). MIL-PRF-28800F, Class 2 0 to 50 °C (32 to 122 °F)
  • Fluke 123B/S | Service Manual - Page 26
    123/124 Service Manual Enclosure Protection IP51, ref: IEC529 2.7 Service and Maintenance Calibration Interval 1 Year 2.8 Safety Designed for measurements on 600 Vrms Category III Installations, Pollution Degree 2, per: • ANSI/ISA S82.01-1994 • EN61010-1 (1993) (
  • Fluke 123B/S | Service Manual - Page 27
    2 Characteristics 2.8 Safety Figure 2-2. Max. Input Voltage v.s. Frequency for VP40 10:1 Voltage Probe 2-13
  • Fluke 123B/S | Service Manual - Page 28
    123/124 Service Manual 2.9 EMC Immunity The Fluke 123/124, 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. Trace
  • Fluke 123B/S | Service Manual - Page 29
    Chapter 3 Circuit Descriptions Title Page 3.1 Introduction 3-3 3.2 Block Diagram 3-3 3.2.1 Channel A, Channel B Measurement Circuits 3-4 3.2.2 Trigger Circuit 3-4 3.2.3 Digital Circuit 3-5 3.2.4 Power Circuit 3-6 3.2.5 Start-up Sequence, Operating Modes 3-7 3.3 Detailed Circuit
  • Fluke 123B/S | Service Manual - Page 30
    123/124 Service Manual 21 16 16 19 Figure 3-1. Fluke 123/124 Block Diagram ST7965.WMF 3-2
  • Fluke 123B/S | Service Manual - Page 31
    blocks. Each block represents a functional part, build up around an Application Specific Integrated Circuit (ASIC). A detailed circuit diagram of each block is shown ASIC name, and the applicable circuit diagram. Block Table 3-1. Fluke 123/124 Main Blocks Main Functions ASIC CHANNEL A CHANNEL B
  • Fluke 123B/S | Service Manual - Page 32
    123/124 Service Manual 3.2.1 Channel A, Channel B Measurement Circuits The Channel A and Channel B circuit are similar. The only difference is that Channel A can do all measurements, whereas Channel B does not
  • Fluke 123B/S | Service Manual - Page 33
    processor, ADC sample acquisition logic, trigger processing logic, display and keyboard control logic, I/O ports, and various other logic circuits. The instrument software is stored in the FlashROM, the RAM is used for temporary data storage. The RESET ROM circuit controls the operating mode of the
  • Fluke 123B/S | Service Manual - Page 34
    123/124 Service Manual drivers, and a fluorescent back light lamp. As the module is not repairable, no detailed description and diagrams are provided. The back light supply voltage is
  • Fluke 123B/S | Service Manual - Page 35
    Mask active mode. The mask active mode can also be entered by pressing the ^ and > key when turning on the test tool. If valid instrument software is present, one of the following modes will become active: Charge mode The Charge mode is entered when the test tool is powered by the
  • Fluke 123B/S | Service Manual - Page 36
    123/124 Service Manual Battery OK OR Mask Active mode & & TURN ON TURN OFF Extern StartUp Software MAINVAL=L & (TURN OFF or BATTVOLT AutoShutDown or TURN OFF Battery refresh MAINVAL=L Figure 3-2. Fluke 123/124 Start-up Sequence, Operating Modes Table 3-2 shows
  • Fluke 123B/S | Service Manual - Page 37
    Charge mode Operational & Charge mode Operational mode Table 3-2. Fluke 123/124 Operating Modes Conditions Remark No power adapter and no on no activity P-ASIC & D-ASIC powered (VBAT & +3V3GAR). Mask software runs Batteries will be charged Test tool operational, and batteries will be charged
  • Fluke 123B/S | Service Manual - Page 38
    123/124 Service Manual 3-10 As described in Section 3.2.5, the test tool operating mode also be entered by pressing the ^ and > key when the test tool is turned on. If valid software is present, one of the three modes Operational, Operational & Charge or Charge will become active. The Charger/
  • Fluke 123B/S | Service Manual - Page 39
    interrupts the battery current if the temperature becomes higher then 70 °C. Two different battery packs are possible: as a standard Fluke 123 is equipped with a NiCd battery, Fluke 124 has a Ni-MH battery that allows a longer operation time. Both instruments will also function on a battery pack
  • Fluke 123B/S | Service Manual - Page 40
    123/124 Service Manual loading C503 and C555 just after connecting the power adapter) via its internal Control circuit. CHAGATE control signal To make the FET conductive its Vgs (
  • Fluke 123B/S | Service Manual - Page 41
    3 Circuit Descriptions 3.3 Detailed Circuit Descriptions An internal current source supplies a current to R559. The resulting voltage is a reference for the maximum allowable primary current (IMAXFLY). The voltage across the sense resistor (FLYSENSP) is compared to the IMAXFLY voltage. If the
  • Fluke 123B/S | Service Manual - Page 42
    123/124 Service Manual 3-14 on pin 3 of the comparator step wise, by changing the duty cycle of the PWM signal SADCLEVD. The comparator output SLOWADC is monitored by
  • Fluke 123B/S | Service Manual - Page 43
    of separate paths for HF and LF signals, an output stage that delivers signals to the trigger and ADC circuits and a control block that allows software control of all modes and adjustments. The transition frequency from the LF-path to the HF-path is approximately 20 kHz, but there is a large
  • Fluke 123B/S | Service Manual - Page 44
    123/124 Service Manual LF input The LF-input (pin 42) is connected to a LF decade attenuator in voltage mode, or to a high impedance buffer for resistance and capacitance
  • Fluke 123B/S | Service Manual - Page 45
    3 Circuit Descriptions 3.3 Detailed Circuit Descriptions CALSIG input pin 36 The reference circuit on the TRIGGER part supplies an accurate +1.23V DC voltage to the CALSIG input pin 36 via R141. This voltage is used for internal calibration of the gain, and the capacitance measurement threshold
  • Fluke 123B/S | Service Manual - Page 46
    123/124 Service Manual 3-18 range trace ../div range trace ../div Table 3-3. Voltage 200Ω 500 µA 5kΩ 2 kΩ 50 µA 50 kΩ 20 kΩ 5 µA 500 kΩ 200 kΩ 500 nA 5 MΩ 2 MΩ 50 nA 30 MΩ 10 MΩ 50 nA To protect the current source from being damaged by a voltage applied to the input, a PTC resistor R172 and
  • Fluke 123B/S | Service Manual - Page 47
    3 Circuit Descriptions 3.3 Detailed Circuit Descriptions and the time lapse between two different known threshold crossings is measured. Thus dV, I and dt are known and the capacitance can be calculated. The unknown capacitance Cx is connected to the red Input A safety banana socket, and the black
  • Fluke 123B/S | Service Manual - Page 48
    123/124 Service Manual Table 3-5. Capacitance Ranges, Current, and Pulse Width Range Current µA Pulse width at Full Scale 50 nF 0.5 µA 25 ms 500 nF 5 µA 25 ms 5000 nF 50 µA
  • Fluke 123B/S | Service Manual - Page 49
    3 Circuit Descriptions 3.3 Detailed Circuit Descriptions Triggering Figure 3-10 shows the block diagram of the T-ASIC trigger section. TRIGLEV1 10 TRIGLEV2 11 TRIG A 13 TRIG B 15 16 TRIGGER ASIC OQ0257 trigger section 35 ALLTRIG 42 TRIGQUAL ALLTRIG analog trigger path DUALTRIG colour filter
  • Fluke 123B/S | Service Manual - Page 50
    123/124 Service Manual TRIGQUAL from ALLTRIG, e.g. on each 10th ALLTRIG pulse a TRIGQUAL pulse , if the noise is larger than the gap. The result is that the system will trigger randomly. This problem is solved by increasing the trigger gap (TRIGLEV1 - TRIGLEV2) automatically to 80% (10 to 90%) of
  • Fluke 123B/S | Service Manual - Page 51
    a DC current to the GENOUT output pin 1. The current is used for resistance and capacitance measurements. It is adjustable in decades between 50 nA and 500 µA depending on the measurement range, and is derived from an external reference current. This reference current is supplied by the REFP
  • Fluke 123B/S | Service Manual - Page 52
    123/124 Service Manual Reference Voltage Circuit This circuit derives several reference voltages from the 1.23V main reference source. +3.3V +1.23V REFPWM2 73 R307 V301 1.23V REFP 72 71 +3.
  • Fluke 123B/S | Service Manual - Page 53
    and relay control, are provided by the D-ASIC via the SCLK and SDAT serial control lines.. 3.3.4 Digital Circuit and ADC's Refer to the Fluke 123/124 block diagram Figure 3-1, and circuit diagrams in Figure 9-5 (Digital Circuit) and Figure 9-3 (ADC-section). The Digital part is built up around the
  • Fluke 123B/S | Service Manual - Page 54
    123/124 Service Manual into an 8-bit data byte (D0-D7). The data are read and So in single shot mode a new reading becomes available when a new trace is started. The test tool software starts an acquisition cycle. The D-ASIC acquires data from the ADC, and stores them internally in a cyclic
  • Fluke 123B/S | Service Manual - Page 55
    at power off should be below 1 mA (with the mains adapter disconnected). Watchdog In case that a software hang-up arises, the watchdog circuit D473 will reset the D-ASIC to re-start the software. Display Control The LCD unit includes the LCD, the LCD drivers, and the fluorescent back light lamp
  • Fluke 123B/S | Service Manual - Page 56
    123/124 Service Manual must have been filled with data for the first column. Data nibbles (4 B13-C9). The duty cycle of the pulses is controlled by the software. By filtering the pulses in low pass filters (RC), software controlled DC voltages are generated. The voltages are used for various control
  • Fluke 123B/S | Service Manual - Page 57
    3 Circuit Descriptions 3.3 Detailed Circuit Descriptions Keyboard Control, ON/OFF Control The keys are arranged in a 6 rows x 6 columns matrix. If a key is pressed, the D-ASIC drives the rows, and senses the columns. The ON/OFF key is not included in the matrix. This key toggles a flip-flop in the
  • Fluke 123B/S | Service Manual - Page 58
    123/124 Service Manual 3-30
  • Fluke 123B/S | Service Manual - Page 59
    Chapter 4 Performance Verification Title Page 4.1 Introduction 4-3 4.2 Equipment Required For Verification 4-3 4.3 How To Verify 4-3 4.4 Display and Backlight Test 4-4 4.5 Input A and Input B Tests 4-5 4.5.1 Input A and B Base Line Jump Test 4-6 4.5.2 Input A Trigger Sensitivity Test 4-7
  • Fluke 123B/S | Service Manual - Page 60
  • Fluke 123B/S | Service Manual - Page 61
    on the specifications, listed in Chapter 2 of this Service Manual. The Fluke PM9091 (1.5m) or PM9092 (0.5m). • 50Ω feed through terminations (2x), Fluke PM9585. • Fluke BB120 Shielded Banana to Female BNC adapters (2x), supplied with the Fluke 123. • Dual Banana Plug to Female BNC Adapter (1x), Fluke
  • Fluke 123B/S | Service Manual - Page 62
    123/124 Service Manual the higher vertical and trigger bandwidth in Fluke 124. Differences in requirements for Fluke 123 and Fluke 124 are clearly indicated. Follow these general instructions for all tests: • For all tests, power the test tool with the PM8907 power adapter. The battery pack must be
  • Fluke 123B/S | Service Manual - Page 63
    Press . The test pattern is removed; the test tool shows Contrast (CL 0110):MANUAL 12. Press (CAL) . The test tool shows the display test pattern shown Press . The test pattern is removed; the test tool shows Contrast (CL 0120):MANUAL 14. Press (CAL) . The test tool shows a light display; the test
  • Fluke 123B/S | Service Manual - Page 64
    123/124 Service Manual • Using select INPUT B: ON . • Press to confirm the selection; the mark changes Press to select auto ranging (AUTO in top of display). ( toggles between AUTO and MANUAL ranging). • Press to open the SCOPE INPUTS menu. • Press to open the SCOPE OPTIONS menu, and choose : 4-6
  • Fluke 123B/S | Service Manual - Page 65
    3. Using toggle the time base between 10 ms/div and 5 ms/div. (the time base ranging is set to manual now, the input sensitivity is still automatic; no indication AUTO or MANUAL is displayed). After changing the time base wait some seconds until the trace has settled. Observe the Input A trace
  • Fluke 123B/S | Service Manual - Page 66
    123/124 Service Manual • Press to select auto ranging (AUTO in top of display). Do not press anymore! • Using change the sensitivity to select manual sensitivity triggered now. 9. Set the 5500A to source a 40 MHz (Fluke 123) or 60 MHz (Fluke 124) leveled sine wave of 1.8V peak-to-peak. 10.
  • Fluke 123B/S | Service Manual - Page 67
    finished, set the 5500A to Standby. Table 4-1. Input A,B Frequency Measurement Accuracy Test 5500A output, 600 mVpp Input A, B Reading 1 MHz 10 MHz 40 MHz 60 MHz (Fluke 124 only) 0.993 to 1.007 MHz 09.88 to 10.12 MHz 38.98 to 41.02 MHz 58.48 to 61.52 MHz Note
  • Fluke 123B/S | Service Manual - Page 68
    123/124 Service Manual Figure 4-4. Test Tool Input B to 5500A Scope Output 50Ω ST8005 auto ranging (AUTO in top of display). Do not press anymore! • Using change the sensitivity to select manual sensitivity ranging, and lock the Input B sensitivity on 200 mV/div. • Press • Press to open the
  • Fluke 123B/S | Service Manual - Page 69
    of display). Do not press anymore! • Using change the sensitivity to select manual sensitivity ranging, and lock the Input B sensitivity on 200 mV/div. • trigger icon ( ). 6. Set the 5500A to source a 25 MHz (Fluke 123) or 40 MHz (Fluke 124) leveled sine wave of 400 mV peak-to-peak. 7. Adjust
  • Fluke 123B/S | Service Manual - Page 70
    123/124 Service Manual 11. Verify that the signal is well triggered. If it is not, moving the Input B ground level. Using the keys move the ground level. • Using change the time base to select manual time base ranging, and lock the time base on 10 ms/div. • Press to open the SCOPE INPUTS menu.
  • Fluke 123B/S | Service Manual - Page 71
    4 Performance Verification 4.5 Input A and Input B Tests • Press to open the SCOPE INPUTS menu. • Press to open the SCOPE OPTIONS menu, and choose: SCOPE MODE: I SINGLE SHOT | WAVEFORM MODE: I NORMAL 3. Set the 5500A to source 0.4V DC. 4. Verify that no trace is shown on the test tool display, and
  • Fluke 123B/S | Service Manual - Page 72
    123/124 Service Manual 20. Verify that no trace is shown on the test tool display, and that the status line at the display bottom shows Wait:B . If the
  • Fluke 123B/S | Service Manual - Page 73
    4 Performance Verification 4.5 Input A and Input B Tests • Using change the time base to select manual time base ranging, and lock the time base on 10 ms/div. • Press to open the SCOPE INPUTS menu. • Press to open the SCOPE OPTIONS
  • Fluke 123B/S | Service Manual - Page 74
    123/124 Service Manual Sensitivity (Oscilloscope) 5 mV/div 10 mV/div 20 mV/div 50 mV/div 100 mV/div 200 mV/div 500 mV/div 1 V/div 2 V/div 5 V/div
  • Fluke 123B/S | Service Manual - Page 75
    4 Performance Verification 4.5 Input A and Input B Tests 2. Select the following test tool setup: • Press to select auto ranging (AUTO in top of display). Do not press anymore! • Press to open the INPUT A MEASUREMENTS menu, and choose: MEASURE on A: I VAC • Press to open the INPUT B
  • Fluke 123B/S | Service Manual - Page 76
    123/124 Service Manual • Press to open the SCOPE INPUTS menu, and choose: INPUT A: I AC | I NORMAL | INPUT B: I AC | NORMALI • Press to open the SCOPE INPUTS menu. • Press to open
  • Fluke 123B/S | Service Manual - Page 77
    4 Performance Verification 4.5 Input A and Input B Tests From the INPUT B PEAK sub-menu choose: PEAK TYPE : I PEAK-PEAK • Using select 1V/div for input A and B. 3. Set the 5500A to source a sine wave, to the first test point in Table 4-5 (NORMAL output, WAVE sine). 4. Observe the Input A and
  • Fluke 123B/S | Service Manual - Page 78
    123/124 Service Manual 4.5.14 Input A and B High Voltage AC/DC Accuracy Test Warning Dangerous voltages will be present on the calibration source and connecting cables during the following
  • Fluke 123B/S | Service Manual - Page 79
    4 Performance Verification 4.5 Input A and Input B Tests 3. Using set the Input A and B sensitivity to the first test point in Table 4-7. The corresponding range is shown in the second column of the table. 4. Set the 5500A to source the required AC voltage (NORMAL output, WAVE sine). 5. Observe
  • Fluke 123B/S | Service Manual - Page 80
    123/124 Service Manual 2. Select the following test tool setup: • Press to select auto ranging (AUTO in top of display). • Press to open the INPUT A MEASUREMENTS menu, and choose:
  • Fluke 123B/S | Service Manual - Page 81
    4 Performance Verification 4.5 Input A and Input B Tests 4.5.17 Diode Test Function Test Proceed as follows to test the Diode Test function : 1. Connect the test tool to the 5500A as for the previous test (see Figure 4-7). 2. Press to open the INPUT A MEASUREMENTS menu, and choose: MEASURE on A: I
  • Fluke 123B/S | Service Manual - Page 82
    123/124 Service Manual Table 4-9. Capacitance Measurement Verification Points 5500A output Reading 40 nF 300 nF 3 µF 30 µF 300 µF 0 (remove test tool input connections ) 39.10 to 40.90 293.0
  • Fluke 123B/S | Service Manual - Page 83
    4 Performance Verification 4.5 Input A and Input B Tests • Using select 20 µs/div. • Press to enable the arrow keys for selecting the video line number. • Using select the line number: 622 for PAL or SECAM 525 for NTSC. 3. Set the TV Signal Generator to source a signal with the following
  • Fluke 123B/S | Service Manual - Page 84
    123/124 Service Manual PAL310.BMP Figure 4-11. Test Tool Screen for PAL/SECAM line 310 NTSC262.BMP Figure 4-12. Test Tool Screen for NTSC line 262 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)
  • Fluke 123B/S | Service Manual - Page 85
    4 Performance Verification 4.5 Input A and Input B Tests 9. Using select the line number: 310 for PAL or SECAM 262 for NTSC 10. Observe the trace, and check to see if the test tool triggers on: line number 311 for PAL or SECAM, see Figure 4-14 line number 262 for NTSC, see Figure 4-15.
  • Fluke 123B/S | Service Manual - Page 86
    123/124 Service Manual 4-28
  • Fluke 123B/S | Service Manual - Page 87
    Chapter 5 Calibration Adjustment Title Page 5.1 General ...5-3 5.1.1 Introduction 5-3 5.1.2 Calibration number and date 5-3 5.1.3 General Instructions 5-3 5.2 Equipment Required For Calibration 5-4 5.3 Starting Calibration Adjustment 5-4 5.4 Contrast Calibration Adjustment 5-6 5.5 Warming
  • Fluke 123B/S | Service Manual - Page 88
  • Fluke 123B/S | Service Manual - Page 89
    one year. The Calibration Adjustment procedure is identical for Fluke 123 and Fluke 124. 5.1.2 Calibration number and date When storing valid 5-1. Version & Calibration Screen VERSION.BMP 5.1.3 General Instructions Follow these general instructions for all calibration steps: • Allow the 5500A to
  • Fluke 123B/S | Service Manual - Page 90
    123/124 Service Manual • Ensure that the test tool battery is charged sufficiently. 5.2 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
  • Fluke 123B/S | Service Manual - Page 91
    means that the last time this step was done, the calibration process was successful. It does not necessarily mean that the unit meets the specifications related to this step! IDLE (invalid) After (re)entering this step, the calibration process is not started. The calibration data are invalid. This
  • Fluke 123B/S | Service Manual - Page 92
    123/124 Service Manual 5.4 Contrast Calibration Adjustment After entering the Maintenance mode, the visible. 4. Press to select the default contrast calibration. The display shows: Contrast (CL 0110) :MANUAL 5. Press CAL. The display shows the test pattern at default contrast. 6. Using set the
  • Fluke 123B/S | Service Manual - Page 93
    5 Calibration Adjustment 5.5 Warming Up & Pre-Calibration 5.5 Warming Up & Pre-Calibration After entering the Warming-Up & Pre-Calibration state, the display shows: WarmingUp (CL 0200):IDLE (valid) or (invalid). You must always start the Warming Up & Pre Calibration at Warming Up (CL0200) . Starting
  • Fluke 123B/S | Service Manual - Page 94
    123/124 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 5-1. 4. Set the 5500A
  • Fluke 123B/S | Service Manual - Page 95
    5 Calibration Adjustment 5.6 Final Calibration Table 5-2. HF Gain Calibration Points Slow Cal step 5500A Setting (1 kHz, MODE wavegen, WAVE square) Test Tool Input Signal Requirements (1 kHz square, trise
  • Fluke 123B/S | Service Manual - Page 96
    123/124 Service Manual 5.6.3 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
  • Fluke 123B/S | Service Manual - Page 97
    5 Calibration Adjustment 5.6 Final Calibration Figure 5-6. Volt Gain Calibration Input Connections
  • Fluke 123B/S | Service Manual - Page 98
    123/124 Service Manual 10. Connect the test tool to the 5500A as shown in Figure 5-7. Figure 5-7. Volt Gain Calibration Input Connections 500V 11. Set the 5500A to supply a
  • Fluke 123B/S | Service Manual - Page 99
    5 Calibration Adjustment 5.6 Final Calibration 5.6.7 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 5-8. Notice that the sense leads must be connected directly
  • Fluke 123B/S | Service Manual - Page 100
    123/124 Service Manual 5.6.8 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.
  • Fluke 123B/S | Service Manual - Page 101
    5 Calibration Adjustment 5.7 Save Calibration Data and Exit 5.6.10 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 5-9 (Section 5.6.8).
  • Fluke 123B/S | Service Manual - Page 102
    123/124 Service Manual Possible error messages. The following messages can be shown on Press YES. The test tool will show the message The test tool needs calibration. Please contact your service center at power on. The calibration date and number will not be updated. A complete recalibration must
  • Fluke 123B/S | Service Manual - Page 103
    Chapter 6 Disassembling the Test Tool Title Page 6.1. Introduction 6-3 6.2. Disassembling Procedures 6-3 6.1.1 Required Tools 6-3 6.2.2 Removing the Battery Pack 6-3 6.2.3 Removing the Bail 6-3 6.2.4 Opening the Test Tool 6-3 6.2.5 Removing the Main PCA Unit 6-5 6.2.6 Removing the Display
  • Fluke 123B/S | Service Manual - Page 104
  • Fluke 123B/S | Service Manual - Page 105
    6 Disassembling the Test Tool 6.1. Introduction 6.1. 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
  • Fluke 123B/S | Service Manual - Page 106
    123/124 Service Manual Figure 6-1. Fluke 123/124 Main Assembly ST8014.EPS 6-4
  • Fluke 123B/S | Service Manual - Page 107
    6 Disassembling the Test Tool 6.2. Disassembling Procedures 6.2.5 Removing the Main PCA Unit Referring to Figure 6-1, use the following procedure to remove the main PCA unit. 1. Open the test tool (see Section 6.2.4). 2. Disconnect the LCD flex cable, and the keypad foil flat cable, see Figure 6-2.
  • Fluke 123B/S | Service Manual - Page 108
    123/124 Service Manual 6.2.6 Removing the Display Assembly Caution Read the Caution statement in Section 6.5 when installing the display assembly. An incorrect installation can damage the display assembly. There are no serviceable insulator (item 3), and the LED guide piece (item 6). 4. Remove the
  • Fluke 123B/S | Service Manual - Page 109
    6 Disassembling the Test Tool 6.3 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
  • Fluke 123B/S | Service Manual - Page 110
    123/124 Service Manual 6.4 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
  • Fluke 123B/S | Service Manual - Page 111
    6 Disassembling the Test Tool 6.5 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
  • Fluke 123B/S | Service Manual - Page 112
    123/124 Service Manual 6-10
  • Fluke 123B/S | Service Manual - Page 113
    Finding 7-4 7.3 Charger Circuit 7-4 7.4 Starting with a Dead Test Tool 7-6 7.4.1 Test Tool Completely Dead 7-6 7.4.2 Test Tool Software Does not Run 7-7 7.4.3 Software Runs, Test Tool not Operative 7-7 7.5 Miscellaneous Functions 7-8 7.5.1 Display and Back Light 7-8 7.5.2 Fly Back Converter
  • Fluke 123B/S | Service Manual - Page 114
  • Fluke 123B/S | Service Manual - Page 115
    7.1 Introduction This chapter describes troubleshooting procedures that can be used to isolate problems with the test tool. Warning are operating it correctly by reviewing the operating instructions in the Users Manual or Getting Started Manual. • When making measurements for fault finding, you
  • Fluke 123B/S | Service Manual - Page 116
    123/124 Service Manual 7.2 Starting Fault Finding. After each step, continue with the next step, unless stated otherwise. Power the test tool by the battery pack only, then by
  • Fluke 123B/S | Service Manual - Page 117
    7 Corrective Maintenance 7.3 Charger Circuit If not correct, then: a. Check TP571 (+3V3GAR) for +3V3V. If not correct, possibly caused by V569, R580, TP571 short to ground, loose pins of N501, N501 defective. b. Check N501 pin 8 (VADALOW) for ≅ 1.1V If not correct: 1. Check R515 and connections. The
  • Fluke 123B/S | Service Manual - Page 118
    123/124 Service Manual The CHARCURR voltage on TP531 is controlled by a pulse width modulated voltage tool off. Keep the keys pressed, and turn the test tool on again. This will start up the mask software. If you still hear no beep, continue at step 2. If you hear a weak beep now, continue at
  • Fluke 123B/S | Service Manual - Page 119
    the 3.69 MHz clock is present, then continue at Section7.4.3. 7.4.2 Test Tool Software Does not Run. 1. Turn the test tool OFF and ON again. 2. Check 500 kHz is not present, but you hear a weak beep, the test tool software runs, but the buzzer circuit does not function correctly. Go to Section 7.5.10
  • Fluke 123B/S | Service Manual - Page 120
    123/124 Service Manual 7.5 Miscellaneous Functions 7.5.1 Display and Back Light Warning The voltage for the LCD back light fluorescent lamp is >400V! 1. Connect another LCD unit to see if the problem is caused by the LCD unit. The unit is not repairable. 2. Defective display Check the LCD
  • Fluke 123B/S | Service Manual - Page 121
    7 Corrective Maintenance 7.5 Miscellaneous Functions 5. Backlight brightness control not correct: Check the TP605 (BACKBRIG, supplied by D-ASIC D471) for a 25 kHz, 3.3 V pulse signal. The duty cycle of the pulses controls the back light brightness. The backlight brightness increases with an
  • Fluke 123B/S | Service Manual - Page 122
    123/124 Service Manual 5. Check N501 pin 43 (COSC) for a triangle waveform, 50...100 kHz, +1.6V to +3.2V. If not correct check C553 and connections; check IREF, see step 6.
  • Fluke 123B/S | Service Manual - Page 123
    Replace the key pad, and the key pad foil to see if this cures the problem. 2. Press a key, and check ROW0...5 (measure spots MS432..MS437) for the is pressed the ROW lines are low if a battery is installed; if the 123 is powered by the the mains adapter only, the lines are alternating pulsing and
  • Fluke 123B/S | Service Manual - Page 124
    123/124 Service Manual 2. Press to open the SCOPE INPUTS menu. Press to open the SCOPE OPTIONS ... menu, and select: SCOPE MODE: I ROLL MODE | WAVEFORM MODE: I NORMAL. 3. Apply a 1 kHz
  • Fluke 123B/S | Service Manual - Page 125
    the Ohms part in the C-ASIC is defective: replace N101. Range Current 50 Ω 1) 500 µA 500 Ω 500 µA 5 kΩ 50 µA 1) 50 Ω range for CONTINUITY only. 50 kΩ 5 µA 500 kΩ 0.5 µA 5 MΩ 50 nA 30 MΩ 50 nA 7-13
  • Fluke 123B/S | Service Manual - Page 126
    123/124 Service Manual 2. Press and select MEASURE on A: I CAP . Verify TP156 for +0.3 ... 0V pulses (repetition rate 100...200 ms): Zero scale (open input): pulse width approximately 30 µs. Full
  • Fluke 123B/S | Service Manual - Page 127
    7 Corrective Maintenance 7.5 Miscellaneous Functions Press to open the SCOPE OPTIONS ... menu, and select: SCOPE MODE: I NORMAL | WAVEFORM MODE: I NORMAL 7. Supply a 15.6 kHz square wave of 20V (+10...-10V) to Input A, and Input B. 8. Check: a. TP308 (TVOUT) for 15.6 kHz, -0.8...+0.6V pulse (
  • Fluke 123B/S | Service Manual - Page 128
    123/124 Service Manual 7.5.11 Reset ROM Circuit 1. Check TP487 for +3V (supplied by D471 tool off. Keep the keys pressed, and turn the test tool on again. This will start up the mask software. You will hear a very weak beep now. 4. In the terminal program type capital characters X (no ENTER!).
  • Fluke 123B/S | Service Manual - Page 129
    and duty cycle. 7.6 Loading Software To load instrument software in the test tool, the Fluke-43-123-19x ScopeMeter Loader program V3.0 is required. configure, the ScopeMeter Loader Program must be used and dedicated Loader and Model files. This has to be done in an Authorized Fluke Service Centre.
  • Fluke 123B/S | Service Manual - Page 130
    123/124 Service Manual power off and every time current should not exceed 1 mA (with the mains adapter disconnected!). A more direct check of correct CPLD-functioning is to check for a 61 us negative going pulse at test point TP480 at power off. TP480 carries CPLD output signal 'enablemain'. 7-18
  • Fluke 123B/S | Service Manual - Page 131
    Chapter 8 List of Replaceable Parts Title Page 8.1 Introduction 8-3 8.2 How to Obtain Parts 8-3 8.3 Final Assembly Parts 8-4 8.4 Main PCA Unit Parts 8-6 8.5 Main PCA Parts 8-7 8.6 Accessory Replacement Parts 8-25 8.7 Service Tools 8-25 8-1
  • Fluke 123B/S | Service Manual - Page 132
  • Fluke 123B/S | Service Manual - Page 133
    model 123 or 124 ScopeMeter test Fluke service center. To locate an authorized service center refer to the second page of this manual instructions, if necessary. To ensure prompt delivery of the correct part, include the following information when you place an order: • Instrument model (Fluke 123
  • Fluke 123B/S | Service Manual - Page 134
    123/124 Service Manual 8.3 Final Assembly Parts See Table 8-1 and Figure 8-1 for the Final Assembly parts. Item 1 1 1 2 3 4 5 6 7 8 9 10 11 12 13a 13b 14 15 16 A Table 8-1. Final Assembly Parts Description top case assembly window/decal (lens) Fluke 123 window/decal (lens) Fluke 124 shielding
  • Fluke 123B/S | Service Manual - Page 135
    8 List of Replaceable Parts 8.3 Final Assembly Parts Figure 8-1. Fluke 123/124 Final Assembly ST8014.EPS 8-5
  • Fluke 123B/S | Service Manual - Page 136
    123/124 Service Manual 8.4 Main PCA Unit Parts See Table 8-2 and Figure 8-2 for the 502 21507 3 insulator for power input 5322 325 10163 5 main PCA shielding box 5322 466 10976 6 guide piece for optical gate LEDs 5322 256 10201 7 main PCA shielding plate 5322 466 10964 8 screw M2.
  • Fluke 123B/S | Service Manual - Page 137
    8 List of Replaceable Parts 8.5 Main PCA Parts 8.5 Main PCA Parts See Figure 9-6 and Figure 9-7 at the end of Chapter 9 for the Main PCA drawings. Reference Designator 1 2 3 ( X100 ) Table 8-3. Main PCA Description Ordering Code Led Holder for H521 and H522 Screw for Input Banana Jack Assembly
  • Fluke 123B/S | Service Manual - Page 138
    123/124 Service Manual Reference Designator C132 C133 C134 C136 C142 C145 C146 Description CER CHIP CAP 63V 0.25PF 4.7PF CER CHIP CAP 63V 5% 47PF CER CHIP CAP 63V 5%
  • Fluke 123B/S | Service Manual - Page 139
    Reference Designator C212 C213 C214 C216 C217 C218 C219 C221 C222 C223 C224 C231 C232 C233 C234 C236 C242 C245 C246 Description CER CAP 1 500V 0.25PF 4.7PF CER CAP 1 500V 0.25PF 4.7PF CER CAP 1 500V 0.25PF 4.7PF CER CAP 1 500V 0.25PF 4.7PF CER CAP 1 500V 2% 10PF CER CAP 1 500V 0.25PF 4.7PF CER CAP
  • Fluke 123B/S | Service Manual - Page 140
    123/124 Service Manual 8-10 Reference Designator C289 C290 C291 Description CER CHIPCAP 25V 20% 100NF CER CHIPCAP 25V 20% 100NF CER CHIPCAP 25V 20% 100NF C301 C303 C306
  • Fluke 123B/S | Service Manual - Page 141
    Reference Designator C396 C397 C398 C399 C400 C401 C402 C403 C404 C405 C406 C407 C408 C409 C410 C415 C416 C431 C432 C433 C434 C436 C438 C439 C441 C442 C451 C452 C453 C455 C456 C457 C458 C460 Description CER CHIPCAP 25V 20% 100NF CER CHIPCAP 25V 20% 100NF CER CHIPCAP 25V 20% 100NF CER CHIPCAP 25V 20
  • Fluke 123B/S | Service Manual - Page 142
    123/124 Service Manual 8-12 Reference Designator C463 C464 C465 C466 C470 C471 C472 C473 C474 C475 C477 C478 C479 C480 C481 C482 C483 C484 C485 C487 C488 C489
  • Fluke 123B/S | Service Manual - Page 143
    Reference Designator C509 C511 C512 C528 C529 C531 C532 C533 C534 C547 C548 C549 C550 C551 C552 C553 C554 C555 C561 C562 C563 C564 C565 C567 C568 C572 C573 C574 C576 C583 C591 C592 C593 C594 Description CER CAP X5R 1206 10% 1UF CER CHIPCAP 25V 20% 100NF CER CHIPCAP 25V 20% 100NF ALCAP NICHICON
  • Fluke 123B/S | Service Manual - Page 144
    123/124 Service Manual Reference Designator Description C602 C603 C604 C605 C606 C607 C608 C609 C610 C611 CER CHIP CAP 25V 20% 47NF CER CHIPCAP 25V 20% 100NF CER
  • Fluke 123B/S | Service Manual - Page 145
    Reference Designator L181 L182 L183 L281 L282 L283 L421 L422 L423 L424 L425 L426 L427 L428 L480 L501 L502 L503 L504 L505 L506 L507 L562 L563 L564 L566 L567 L569 L600 Description CHIP INDUCT. 47UH 10% TDK CHIP INDUCT. 47UH 10% TDK CHIP INDUCT. 47UH 10% TDK CHIP INDUCT. 47UH 10% TDK CHIP INDUCT.
  • Fluke 123B/S | Service Manual - Page 146
    123/124 Service Manual Reference Designator N501 * N532 * N534 * Description P-ASIC OQ0256 LOW POW OPAMP LMC7101BIM5X NSC LOW POW OPAMP LMC7101BIM5X NSC Ordering Code 5322 209 13143 5322 209
  • Fluke 123B/S | Service Manual - Page 147
    Reference Designator R133 R134 R136 R137 R138 R139 R140 R141 R142 R143 R144 R146 R151 R152 R153 R154 R155 R156 R157 R158 R159 R160 R161 R165 R171 R172 R173 R182 R184 R186 R188 R189 Description RESISTOR CHIP RC12G 1% 10K RESISTOR CHIP RC12G 1% 1K RESISTOR CHIP RC-02G 1% 100E RESISTOR CHIP RC-02H 1%
  • Fluke 123B/S | Service Manual - Page 148
    123/124 Service Manual Reference Designator R202 R203 R204 R205 R206 R208 R209 R210 R211 R212 R213 R214 R216 R217 R218 R219 R220 R221 R225 R231 R232 R233 R234
  • Fluke 123B/S | Service Manual - Page 149
    Reference Designator R252 R253 R254 R255 R256 R257 R258 R259 R260 R261 R271 R282 R284 R286 R288 R289 Description RESISTOR CHIP TC50 1% 100K RESISTOR CHIP RC12H 1% 681K RESISTOR CHIP RC12H 1% 681K RESISTOR CHIP RC12H 1% 178K RESISTOR CHIP TC50 1% 100K RESISTOR CHIP TC100 1% 133E RESISTOR CHIP RC11
  • Fluke 123B/S | Service Manual - Page 150
    123/124 Service Manual 8-20 Reference Designator R331 R333 R337 R339 R342 R352 R353 R354 R356 R369 R371 R375 R376 R377 R378 R381 R385 R390 R391 R392 R393 R394
  • Fluke 123B/S | Service Manual - Page 151
    Reference Designator R416 R417 R421 R422 R423 R424 R425 R426 R427 R428 R431 R432 R433 R434 R436 R438 R439 R441 R442 R443 R444 R450 R451 R454 R457 R466 R470 R471 R473 R474 R475 R476 R477 R478 Description RESISTOR CHIP RC12H 1% 1E RESISTOR CHIP RC12H 1% 1E RESISTOR CHIP RC22H 1% 47E RESISTOR CHIP
  • Fluke 123B/S | Service Manual - Page 152
    123/124 Service Manual Reference Designator R479 R480 R481 R482 R483 R484 R485 R487 R490 R491 R492 R493 R494 R495 R496 R497 R498 R501 R502 R503 R504 R506 R507
  • Fluke 123B/S | Service Manual - Page 153
    Reference Designator R531 R532 R534 R535 R550 R551 R552 R553 R554 R558 R559 R563 R564 R565 R570 R580 R591 Description RESISTOR CHIP TC50 1% 100K SMD RES 100E 1% TC100 0805 RESISTOR CHIP RC12H 1% 1K47 RESISTOR CHIP RC12H 1% 51K1 RESISTOR CHIP RC12H 1% 348E RESISTOR CHIP LRC01 5% 0E1 RESISTOR CHIP
  • Fluke 123B/S | Service Manual - Page 154
    123/124 Service Manual 8-24 Reference Designator V301 * V302 * V353 * V354 * V356 * V358 * V359 * V395 * V401 * V402 * V403 * V471 * V495 * V501 * V503 * V504 * V506 * V550 * V551 * V554 * V555 * V561 *
  • Fluke 123B/S | Service Manual - Page 155
    267 10502 A 4 Top A 3 Top D 4 Top A 5 Top A 4 Top Z501 EMI-FILTER 50V 10A MUR 5322 156 11139 D 3 Top 8.6 Accessory Replacement Parts Black ground lead for STL120 8.7 Service Tools Power adapter cable to check supply current 5322 320 11354 5322 320 11707 8-25
  • Fluke 123B/S | Service Manual - Page 156
    123/124 Service Manual 8-26
  • Fluke 123B/S | Service Manual - Page 157
    Chapter 9 Circuit Diagrams Title Page 9.1 Introduction 9-1 9.2 Schematic Diagrams 9-2 9-1
  • Fluke 123B/S | Service Manual - Page 158
  • Fluke 123B/S | Service Manual - Page 159
    9.1 Introduction This chapter contains all circuit diagrams and PCA drawings of the test tool. There are no serviceable parts on the LCD unit. Therefore no circuit diagrams and drawings of the LCD unit are provided. Referring signals from one place to another in
  • Fluke 123B/S | Service Manual - Page 160
    123/124 Service Manual 9.2 Schematic Diagrams Where to find parts on the Main PCA assembly drawings is listed for each component in the last column of the List of
  • Fluke 123B/S | Service Manual - Page 161
    9 Circuit Diagrams 9.2 Schematic Diagrams 8 7 6 5 4 3 2 1 F F E E D D C C B B A A 8 7 6 5 4 3 2 1 Figure 9-1. Circuit Diagram 1, Channel A Circuit 9-3
  • Fluke 123B/S | Service Manual - Page 162
    123/124 Service Manual 8 7 6 5 4 3 2 1 F F E E D D C C B B A A 8 7 6 5 4 3 2 1 Figure 9-2. Circuit Diagram 2, Channel B Circuit 9-4
  • Fluke 123B/S | Service Manual - Page 163
    9 Circuit Diagrams 9.2 Schematic Diagrams 8 7 6 5 4 3 2 1 F F E E D D C C B B A A 8 7 6 5 4 3 2 1 Figure 9-3. Circuit Diagram 3, Analog to Digital Conversion 9-5
  • Fluke 123B/S | Service Manual - Page 164
    123/124 Service Manual 8 7 6 5 4 3 2 1 F F E E D D C C B B A A 8 7 6 5 4 3 2 1 Figure 9-4. Circuit Diagram 4, Trigger Circuit 9-6
  • Fluke 123B/S | Service Manual - Page 165
    9 Circuit Diagrams 9.2 Schematic Diagrams 8 7 6 5 4 3 2 1 F F E E D D C C B B A A 8 7 6 5 4 3 2 1 Figure 9-5. Circuit Diagram 5, Digital Circuit 9-7
  • Fluke 123B/S | Service Manual - Page 166
    123/124 Service Manual 8 7 6 5 4 3 2 1 F F E E D D C C B B A A 8 7 6 5 4 3 2 1 Figure 9-6. Circuit Diagram 6, Power Circuit 9-8
  • Fluke 123B/S | Service Manual - Page 167
    9 Circuit Diagrams 9.2 Schematic Diagrams 8 7 6 5 4 3 2 1 F F E E D D C C B B A A 8 7 6 5 4 3 2 1 Figure 9-7. Circuit Diagram 7, Slow ADC / Backlight Converter 9-9
  • Fluke 123B/S | Service Manual - Page 168
    123/124 Service Manual 9-10 8 20030206 Figure 9-8. Circuit Diagram 8, Keyboard Circuit
  • Fluke 123B/S | Service Manual - Page 169
    24 1 41 64 1 10 5 6 28 14 15 32 -------- 17 49 -------- 64 28 14 15 22 ------ 12 34 ------ 44 22 ------ 12 34 ------ 44 9 Circuit Diagrams 9.2 Schematic Diagrams Figure 9-9. Main PCA, Large Component Side 9-11
  • Fluke 123B/S | Service Manual - Page 170
    123/124 Service Manual 9-12 Figure 9-10. Main PCA, Small Component (SMD) Side
  • Fluke 123B/S | Service Manual - Page 171
    Chapter 10 Modifications Title Page 10.1 Software modifications 10-1 10.2 Hardware modifications 10-1
  • Fluke 123B/S | Service Manual - Page 172
  • Fluke 123B/S | Service Manual - Page 173
    (see Figure 5.1 in Section 5). 3. Press to return to normal mode. The first software release suitable for both Fluke 123 and Fluke 124 is V02.00. This release is still valid at the printing date of this Service Manual. 10.2 Hardware modifications Changes and improvements made to the test tool
  • Fluke 123B/S | Service Manual - Page 174
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4822 872 05389
February 2003
© 2003 Fluke Corporation. All rights reserved. Printed in the Netherlands
All product names are trademarks of their respective companies.
123/124
Industrial ScopeMeter
Service Manual