0master-97 - Fluke

1 4822 872 05389 February 2003 2003 Fluke Corporation. All rights reserved. Printed in the NetherlandsAll product names are trademarks of their respective ScopeMeter Service ManualSERVICE CENTERSTo locate an authorized service center, visit us on the World Wide Web: call Fluke using any of the phone numbers listed below:+1-888-993-5853 in and Canada+31-402-675-200 in Europe+1-425-446-5500 from other countriesTable of ContentsChapterTitlePageSafety Introduction .. Safety Caution and Warning Symbols used in this Manual and on Instrument .. Impaired Safety .. General Safety 1-4 Characteristics.

2 Introduction .. Dual Input Vertical .. Horizontal .. Trigger .. Advanced Scope Dual Input Meter .. Input A and Input B .. Input A .. Advanced Meter Cursor Readout ( Fluke 124).. Miscellaneous .. Environmental .. Service and Maintenance .. Safety .. EMC Immunity .. 2-14 Circuit Descriptions .. Introduction .. Block Diagram .. Channel A, Channel B Measurement Trigger Circuit .. Digital Circuit .. Power Circuit .. 3-6123/124 Service Start-up Sequence, Operating Modes .. Detailed Circuit Power Circuit .. Channel A - Channel B Measurement Circuits.

3 Trigger Circuit .. Digital Circuit and ADC s .. 3-25 Performance Introduction .. Equipment Required For Verification .. How To Verify .. Display and Backlight Test .. Input A and Input B Tests .. Input A and B Base Line Jump Test .. Input A Trigger Sensitivity Test .. Input A Frequency Response Upper Transition Point Test .. Input A Frequency Measurement Accuracy Test .. Input B Frequency Measurement Accuracy Test .. Input B Frequency Response Upper Transition Point Test .. Input B Trigger Sensitivity Test .. Input A and B Trigger Level and Trigger Slope Input A and B DC Voltage Accuracy Test.

4 Input A and B AC Voltage Accuracy Test .. Input A and B AC Input Coupling Test .. Input A and B Volts Peak Measurements Test .. Input A and B Phase Measurements Test .. Input A and B High Voltage AC/DC Accuracy Resistance Measurements Test .. Continuity Function Test .. Diode Test Function Test .. Capacitance Measurements Test .. Video Trigger 4-24 Calibration General .. Calibration number and General Equipment Required For Calibration .. Starting Calibration Adjustment .. Contrast Calibration Adjustment .. Warming Up & Pre-Calibration .. Final Calibration.

5 HF Gain Input A&B .. Delta T Gain, Trigger Delay Time & Pulse Adjust Input Pulse Adjust Input B .. Gain DMM (Gain Volt) .. Volt Zero Ohm .. Gain Capacitance Gain Low and High .. Capacitance Clamp & Capacitance Gain .. Save Calibration Data and Exit .. 5-15 Contents (continued)Disassembling the Test Introduction .. Disassembling Procedures .. Required Tools .. Removing the Battery Pack .. Removing the Bail .. Opening the Test Tool .. Removing the Main PCA Removing the Display Removing the Keypad and Keypad Disassembling the Main PCA Unit.

6 Reassembling the Main PCA Unit .. Reassembling the Test Tool .. 6-8 Corrective Introduction .. Starting Fault Finding.. Charger Starting with a Dead Test Tool .. Test Tool Completely Test Tool Software Does not Run.. Software Runs, Test Tool not Operative .. Miscellaneous Display and Back Light .. Fly Back Converter .. Slow Optical Port (Serial RS232 Interface).. Channel A, Channel B Voltage Channel A Ohms and Capacitance Measurements .. Trigger Reference Voltages .. Buzzer Circuit .. Reset ROM Circuit .. RAM Test .. Power ON/OFF.

7 PWM Randomize Circuit .. Loading Software .. Configuration of CPLD-chip 7-17 Circuit Diagrams .. Introduction .. Schematic Software modifications .. Hardware modifications .. 10-1 List of Visible Trace Disturbance .. Disturbance < 10% .. Disturbance < 1% .. 123 Main Blocks .. 123 Operating Modes .. Ranges And Trace Sensitivity .. Ranges, Trace Sensitivity, and Current .. Ranges, Current, and Pulse Width .. PWM Signals .. A,B Frequency Measurement Accuracy DC Measurement Verification Points .. AC Measurement Verification Points .. A and B AC Input Coupling Verification Points.

8 Peak Measurement Verification Measurement Verification Points .. DC and V AC High Voltage Verification Tests .. Measurement Verification Points .. Measurement Verification Gain Calibration Points Gain Calibration Points Slow .. Gain Calibration Points <300V .. Gain Calibration Fault Finding .. 7-4 List of Input Voltage Frequency for VP40 10:1 Voltage 123 Block Diagram .. 123 Start-up Sequence, Operating Modes .. Supply Block Control Voltage .. Converter Current and Control Converter Block Diagram .. Light Converter Voltages .. Block Diagram.

9 Measurement .. Trigger Section Block Diagram .. Repetitive Sampling Mode .. Voltage Section .. Control .. Pixel Test Pattern .. item Tool Input A to 5500A Scope Output 50 .. Tool Input B to 5500A Scope Output 50 .. Tool Input A-B to 5500A Normal Output .. Tool Input A-B to 5500A Normal Output for > Tool Input A to 5500A Normal Output 4-Wire .. Tool Input A to TV Signal Generator .. Tool Screen for PAL/SECAM line 622 .. Tool Screen for NTSC line 525 .. Tool Screen for PAL/SECAM line 310 .. Tool Screen for NTSC line 262 .. Tool Input A to TV Signal Generator Tool Screen for PAL/SECAM line 310 Negative Tool Screen for NTSC line 262 Negative Video.

10 & Calibration Test Gain Calibration Input Connections .. Scope Output to Input A .. Scope Output to Input 5-10123/124 Service Manual5-6. Volt Gain Calibration Input Connections <300V .. Gain Calibration Input Connections 500V .. Ohms calibration Gain Calibration Input 123 Main Assembly .. Cable PCA Unit Assembly .. the display shielding pack installation .. Test Tool without Case .. Diagram 1, Channel A Circuit .. Diagram 2, Channel B Circuit .. Diagram 3, Analog to Digital Conversion .. Diagram 4, Trigger Circuit .. Diagram 5, Digital Circuit.