1.1 Introduction...1-3 1.2 Safety Precautions...1-3 1.3 Caution and Warning Statements...1-3 1.4 Symbols...1-3 1.5 Impaired Safety...1 -4 ' 1.6 General Safety Information...1-4 2 Characteristics...2-1 2.1 Introduction...2-3 2.2 Dual Input Oscilloscope 2-3 2.2.1 Isolated Inputs A and B (Vertical)...2-3 2.2.2 Horizontal...2-4 2.2.3 Trigger and Delay...2-4 2.2.4 Automatic Connect&View Trigger...2-4 2.2.5 Edge Trigger...2-5 2.2.6 Isolated External Trigger...2-5 2.2.7 Video Trigger...2-5 2.2.8 Pulse Width Trigger...2-5 2.2.9 Continuous Auto Set...2-5 2.2.10 Automatic Capturing Scope Screens...2-6 2.3 Automatic Scope Measurements...2-6 2.3.1 General...2-6 2.3.2 DC Voltage (VDC)...2-6 2.3.3 AC Voltage (VAC)...2-6 2.3.4 AC+DC Voltage (True RMS)...2-7 2.3.5 Amperes (AMP)...2-7 2.3.6 Peak...2-7 2.3.7 Frequency (Hz)...2-8 2.3.8 Duty Cycle (DUTY)...2-8 2.3.9 Pulse Width (PULSE)...2-8 2.3.10 Power...2-8 2.3.11 Phase...2-8 2.3.12 Temperature (TEMP)...2-9 2.3.13 Decibel (dB)...2-9 2.4 Meter...2-9 2.4.1 Meter Input...2-9 2.4.2 Meter Functions...2-9 2.5 DMM Measurements on Meter Inputs...2-9 2.5.1 General...2-9 2.5.2 Ohms (£2)...2-10 2.5.3 Continuity (CONT)...2-10 2.5.4 Diode...2-10 2.5.5 Temperature (TEMP)...2-10 2.5.6 DC Voltage (VDC)...2-10 2.5.7 AC Voltage (VAC)...2-11 2.5.8 AC+DC Voltage (True RMS)...2-11 2.5.9 Amperes (AMP)...2-11 2.6 Recorder...2-11 2.6.1 TrendPlot (Meter or Scope)...2-11 2.6.2 Scope Record...2-12 2.7 Zoom, Replay and Cursors...2-12 2.7.1 Zoom...2-12 2.7.2 Replay...2-12 2.7.3 Cursor Measurements...2-12 2.8 Miscellaneous...2-13 2.8.1 Display...2-13 7. .8.7 /l Power...2-13 2.8.3 Probe Calibration...2-13 2.8.4 Memory...2-13 2.8.5 Mechanical...2-13 2.8.6 Optical Interface Port...2-14 2.9 Environmental...2-14 2.10 Zh Safety...2-14 2.11 10:1 Probe 2-16 2.11.1 Safety...2-16 2.11.2 Electrical specifications...2-16 2.11.3 Environmental...2-16 2.12 Electromagnetic Immunity...2-17 3 Circuit Description...3-1 3.1 Introduction...3-3 3.2 Block Diagram...3-3 3.3 Start-up Sequence, Operating Modes...3-7 3.4 Detailed Circuit Descriptions...3-9 3.4.1 Scope Channel A - Scope Channel B...3-9 3.4.2 Meter/Ext Trigger Channel...3-12 3.4.3 Sampling&Triggering (S-ASIC)...3-14 3.4.4 S-ASIC supply...3-19 3.4.5 ADC’s...3-19 3.4.6 Digital Control...3-19 3.4.7 Power...3-24 3.4.8 Slow ADC, RS232 Serial Interface Backlight, Buzzer...3-28 4 Performance Verification...4-1 4.1 Introduction...4-3 4.2 Equipment Required For Verification...4-3 4.3 General Instructions...4-3 4.4 Operating Instructions...4-4 4.4.1 Resetting the test tool...4-4 4.4.2 Navigating through menu’s...4-4 4.4.3 Creating Test Tool Setup 1...4-5 4.5 Display and Backlight Test...4-5 4.6 Scope Input A&B Tests...4-7 4.6.1 Input A&B Vertical Accuracy Test...4-7 4.6.2 Input A&B DC Voltage Accuracy Test...4-9 4.6.3 Input A&B AC Voltage Accuracy Test (LF)...4-11 4.6.4 Input A&B AC Coupled Lower Frequency Test...4-12 4.6.5 Input A and B Peak Measurements Test...4-13 4.6.6 Input A&B Frequency Measurement Accuracy Test...4-14 4.6.7 Input A&B Phase Measurements Test...4-15 4.6.8 Time Base Test...4-16 4.6.9 Input A Trigger Sensitivity Test...4-18 4.6.10 Input A AC Voltage Accuracy (HF) & Bandwidth Test...4-19 4.6.11 Input B Trigger Sensitivity Test...4-20 4.6.12 Input B AC Voltage Accuracy (HF) & Bandwidth Test...4-21 4.6.13 Video test...4-22 4.7 External Trigger Level Test...4-26 4.8 Meter (DMM) Tests...4-27 4.8.1 Meter DC Voltage Accuracy Test...4-27 4.8.2 Meter AC Voltage Accuracy & Frequency Response Test...4-28 4.8.3 Continuity Function Test...4-29 4.8.4 Diode Test Function Test...4-29 4.8.5 Ohms Measurements Test...4-29 4.9 Probe Calibration Generator Test...4-31 5 Calibration Adjustment...5-1 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 5.1.4 Equipment Required For Calibration...5-4 5.2 Calibration Procedure Steps...5-4 5.3 Starting the Calibration...5-4 5.4 Contrast Calibration Adjustment...5-6 5.5 Warming Up & Pre-Calibration...5-7 5.6 Final Calibration...5-8 5.6.1 Input A LF-HF Gain...5-8 5.6.2 Input B LF-HF Gain...5-9 5.6.3 Input A&B LF-HF Gain...5-11 5.6.4 Input A&B Position...5-12 5.6.5 Input A&B Volt Gain...5-12 5.6.6 DMM Volt Gain...5-14 5.6.7 Input A& B, and DMM Zero...5-15 5.6.8 DMM Ohm Gain...5-15 5.6.9 Calculate Gain...5-16 5.7 Save Calibration Data and Exit...5-17 5.8 Probe Calibration...5-18 6 Disassembling the Test Tool...6-1 6.1. Introduction...6-3 6.2. Disassembly & Reassembly Procedures...6-3 6.2.1 Required Tools...6-3 6.2.2 Removing the Tilt Stand & Hang Strap...6-3 6.2.3 Replacing the Side-Strap, Changing the Side-Strap Position...6-3 6.2.4 Opening the Test Tool, Removing the Battery...6-3 6.2.5 Removing the Main PCA Unit...6-5 6.2.6 Removing the Display Assembly...6-6 6.2.7 Removing the Keypad and Keypad Foil...6-6 6.2.8 Disassembling the Main PCA Unit...6-7 6.2.9 Reassembling the Main PCA Unit...6-8 6.2.10 Reassembling the Test Tool...6-8 7 Corrective Maintenance...7-1 7.1 Introduction...7-3 7.2 Starting Fault Finding...7-4 7.3 Charger Circuit...7-5 7.4 Starting with a Dead Test Tool...7-6 7.4.1 Test Tool Completely Dead...7-7 7.4.2 Test Tool Software Does not Run...7-7 7.4.3 Software Runs, Test Tool not Operative...7-8 7.5 Miscellaneous Functions...7-8 7.5.1 Display and Back Light...7-8 7.5.2 Fly Back Converter 7-9 7.5.3 Slow ADC, +3V3SADC...7-10 7.5.4 Keyboard...7-11 7.5.5 Optical Port (Serial RS232 Interface)...7-12 7.5.6 Channel A, Channel B Measurements...7-12 7.5.7 Meter Channel (Ext Trigger Probe Cal)...7-13 7.5.8 Input Signal Acquisition...7-16 7.5.9 ADC’s...7-18 7.5.10 Digital Control & Memory...7-19 7.5.11 Buzzer Circuit...7-20 7.5.12 RAM Test...7-20 7.5.13 Power ON/OFF...7-21 7.6 Loading Software 7-21 8 List of Replaceable Parts...8-1 8.1 Introduction...8-3 8.2 How to Obtain Parts...8-3 8.3 Service Centers...8-3 8.4 Final Assembly Parts...8-4 8.5 Main PCA Unit Parts...8-6 8.6 Main PCA Parts...8-8 8.7 Accessories 8-26 9 Circuit Diagrams...9-1 9.1 Introduction...9-3 9.2 Tracing signals in circuit diagrams...9-3 9.3 Locating Parts & Test Points...9-3 9.4 Diagrams...9-10 10 Modifications...10-1 10.1 Software modifications...10-3