Tektronix OS-261CU Manuals

Manuals and User Guides for Tektronix OS-261CU. We have 1 Tektronix OS-261CU manual available for free PDF download: Technical Manual

Tektronix OS-261CU Technical Manual

Tektronix OS-261CU Technical Manual (217 pages)

Brand: Tektronix | Category: Test Equipment | Size: 4.87 MB

Table of Contents

Table of Contents

12
- Oscilloscope OS-261B(V)1/U and OS-261C(V)1/U
  16
- Introduction
  
  17
- Os-261B(V)1/U
  
  17
- General Information and Installation
  
  19
  - Introduction
    19
  - Characteristics
    19
  - Delay Time and Differential Time Measurement
    25
  - Installation
    31
- 2 Operating Information
  
  33
  - Preliminary Instructions
    33
  - Introduction
    33
  - Safety Information
    33
  - Operating Power Sources
    33
  - Line Voltage and Regulating Range
    33
  - Options
    34
  - Controls and Connectors
    34
  - General
    34
  - Cathode-Ray Tube (CRT) and Display
    34
  - Vertical Deflection System
    34
  - A and B Triggering
    37
  - Calibrator and Power
    39
  - Rear Panel
    40
  - Obtaining Basic Displays
    40
  - Introduction
    40
  - Normal Sweep Display
    40
  - Magnified Sweep Display
    41
  - Delayed Sweep Displays
    41
  - Mixed Sweep Display
    41
  - X-Y Display
    41
Circuit Description

43
- Digital Logic
  43
- Introduction
  43
- Outline for Circuit Description
  43
- Basic Block Diagram of the
  44
  - Preamplifier Circuit
    44
  - Instrument
    44
  - Channel 1 Preamp
    46
    
    General
    46
  - Input Coupling
    47
  - Input Attenuator
    47
  - First Cascode Amplifier
    47
  - Channel 2 Preamp
    48
  - Second Cascode Amplifier
    48
  - Third Cascode Amplifier
    48
    
    General
    48
  - Vertical Channel Switching
    49
    
    First Cascode Amplifier
    49
    
    General
    49
    
    Channel Switch IC
    50
    
    Switching Logic Flip-Flops
    50
  - Vertical Output Amplifier
    51
    
    Channel 2 Signal Output Amplifier
    51
    
    Chop Blanking Amplifier
    51
    
    First IC Amplifier
    51
    
    General
    51
    
    Normal Trigger Pickoff Amplifier
    51
    
    Scale-Factor Switching Circuits
    51
    
    Two Megahertz Clock
    51
  - A Trigger Generator
    52
  - Atrigger Generator
    52
    
    General
    52
    
    Second IC Amplifier
    52
    
    Input Source Follower
    53
    
    Paraphase Amplifier
    53
    
    Trigger Coupling
    53
    
    Trigger Source
    53
    
    Trigger View Amplifier
    53
    
    Tunnel Diode Driver
    53
  - B Trigger Generator
    54
  - Btrigger Generator
    54
  - Sweep and Z-Axis Logic
    54
    
    General
    54
    
    Trigger Source
    54
    
    Sweep Control Integrated Circuit
    55
    
    A Trigger TD Reset Circuit
    56
    
    Delayed Gate Comparator
    56
    
    Holdoff Start Circuit
    56
    
    Main Gate Comparator
    56
    
    Z Axis Logic Multivibrator
    56
    
    A +GATE and B +GATE Amplifiers
    57
    
    B Trigger TD Reset Circuit
    57
    
    Delaying Sweep Latch Circuit
    57
    
    LOWLINE Indicator Circuit
    57
    
    Main Sweep Holdoff Gate and Delayed Sweep Override Amplifier
    57
  - Sweep Generators (And) Timing
    58
  - Switching
    58
    
    General
    58
  - Sweep Generators
    58
    
    Delaying Sweep Generator
    59
    
    Main Gate Amplifier
    59
    
    Sweep Disconnect Amplifier
    59
    
    Delay Pickoff Comparator
    60
    
    Delaying Sweep End Difference Amplifier
    60
    
    Output Buffer Amplifier
    60
    
    Sawtooth Sweep Generator
    60
    
    Sweep Start Amplifier
    60
    
    B" Gate Amplifier
    61
    
    Mixed Mode Operation
    61
    
    Non-Delaying Sweep End Difference Amplifier
    61
    
    Non-Delaying Sweep Generator Differences
    61
    
    Non-Delaying Sweep Generators
    61
  - Horizontal Amplifier
    62
    
    General
    62
    
    TIME/DIV Functions (Knobs Unlocked)
    62
  - Low-Voltage Power Supply
    63
    
    Gain Setting Amplifier
    63
    
    General
    63
    
    Input Paraphase Amplifier
    63
    
    Output Amplifier
    63
    
    Switching Circuit
    63
    
    50-Volt Supply
    65
    
    Power Input
    65
    
    Secondary Circuit
    65
  - Crt Circuit
    66
    
    110-Volt Supply
    66
    
    General
    66
    
    High-Voltage Oscillator
    67
    
    High-Voltage Regulator
    67
    
    Control-Grid DC Restorer
    68
    
    CRT Control Circuits
    68
    
    High-Voltage Rectifiers and Output
    68
    
    Z-Axis Amplifier
    68
  - Calibrator
    69
  - Fan Motor Circuit
    69
    
    General
    69
    
    Multivibrator
    69
    
    Output Amplifier
    69
- Block Diagram
  44
Maintenance

71
- Maintenance Section Outline
  71
- Cabinet and Rack Adapter Removal
  72
- Standard Cabinet Removal
  72
- Rack Adapter Removal
  73
  - Rack Adapter Installation
    74
  - Preventive Maintenance
    74
  - Introduction
    74
  - Cleaning
    74
    
    Air Filter
    75
    
    CRT Face, Filter and Shields
    75
    
    Exterior
    75
    
    General Interior
    75
    
    Switch Contacts
    75
  - Visual Inspection
    76
  - Lubrication
    76
  - Semiconductor Checks
    76
  - Troubleshooting
    76
  - Introduction
    76
  - Troubleshooting Aids
    76
  - Recalibration
    76
  - Troubleshooting Equipment
    77
    
    Diagrams
    77
    
    Diode Color-Code
    77
    
    Resistor Color-Code
    77
    
    Semiconductor Lead Configuration
    77
- Standard Cabinet Installation
  73
- Color Codes for Resistors and Capacitors
  78
  - Troubleshooting Techniques
    80
    
    Check Associated Equipment
    80
    
    Check Control Settings
    80
    
    Check Instrument Calibration
    80
    
    Isolate Trouble to a Circuit
    80
    
    Multimeter
    80
    
    Semiconductor Tester
    80
    
    Test Oscilloscope
    80
    
    Variable Autotransformer
    80
    
    Visual Check
    80
    
    Check Circuit Board Interconnection
    81
    
    Check Individual Components
    81
    
    Check Voltages and Waveforms
    81
  - Special Troubleshooting Information
    84
    
    General
    84
    
    Repair and Readjust the Circuit
    84
    
    Troubleshooting the L.V. Power Supplies
    85
    
    Troubleshooting the High-Voltage Circuit
    86
    
    Troubleshooting the Sweep Circuits
    86
  - Corrective Maintenance
    88
  - Introduction
    88
    
    Troubleshooting the Horizontal Amplifier
    88
    
    Troubleshooting the Vertical System
    88
    
    Troubleshooting the Z-Axis Circuit
    88
  - Obtaining Replacement Parts
    89
  - Soldering Techniques
    89
  - Small Component Replacement
    90
    
    General
    90
    
    Transistor and I.C. Replacement
    90
    
    Interconnecting Pin Replacement
    91
  - Circuit Board Replacement
    92
    
    Cam Switch Replacement
    92
    
    Fuse Replacement
    92
    
    Vertical Preamp Board Removal
    94
    
    Trigger Generator and Z-Axis Logic Board Removal
    95
    
    Fan Motor Board Removal
    96
    
    Timing Board Removal
    96
    
    Vertical Output Board Removal
    96
    
    Inverter Board Removal (Option 7 Only)
    97
    
    Power Supply Board Removal
    97
    
    Main Interface Board Removal
    98
  - Power Transformer Removal
    99
  - Cathode-Ray Tube Removal
    100
  - Cathode-Ray Tube Installation
    101
  - High-Voltage Multiplier Removal
    101
  - Delay Line Removal
    102
  - Recalibration after Repair
    102
  - Instrument Repackaging
    102
- 5 Performance Check Equipment Alternatives
  105
  - Introduction
    105
  - Using this Procedure
    105
  - Test Equipment Required
    105
  - General
    105
  - Special Calibration Fixtures
    105
  - Performance Check
    105
Preliminary Procedure for Performance Check

108
- Operating Temperature
  108
- Operating Voltage
  108
- Power Source
  108
- Warm up
  108
- Display and Vertical System Check
  109
- Trigger System Check
  
  113
- Horizontal System Check
  
  119
- Gate Outputs, External Z-Axis and Calibrator Checks
  
  123
  - 29. Check X Gain
    123
  - 30. Check X Bandwidth
    123
  - 31. Check a and B +GATE Outputs
    124
  - 32. Check CH 2 VERT SIGNAL out
    124
  - 33. Check EXT Z-AXIS Operation
    124
  - 34. Check CALIBRATOR Operation
    124
- 6 Schematic Diagrams & Options 04 and
  
  125
- 7 Replaceable Mechanical Parts
  
  135
- Appendix A References
  
  169
  - Introduction
    171
  - Integral Components of End Item
    174
- Maintenance Allocation
  
  179
  - D-2 Maintenance Function
    179
  - Column Entries
    180
  - Tool and Test Equipment Requirement
    180
    
    Circuit
    181
- Appendix C Additional Authorization List
  
  181
  - Maintenance Allocation Chart
    181
  - Oscilloscope
    183
  - Oscilloscope OS-261B(V)1/U and
    184
    
    Remarks
    185
- Appendix Eexpendable Supplies and Materials List Introduction
  
  187
  - E-1 . Scope
    187
  - Explanation of Columns
    187
- Expendable Supplies and Materials
  
  188

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