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Equipment information:

Oscilloscope -- Tektronix R485

Manufacturer:
Tektronix
Model: R485
Date: 1978
Category: Measurement instruments
Group: Oscilloscope
Description:
Information:







These manuals for the Tektronix R485 Oscilloscope
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Service and User Manual -- Tektronix -- R485

Manual Type: Service and User Manual Tektronix-8949-Manual-Page-1-Picture
Pages: 192
Size: 30.84 Mbytes (32335934 Bytes)
Language: english
Revision:
Manual-ID/Number: 070-1193-00
Date: 01 January 1978
Quality: Scanned document, all readable.
Upload date:
Downloads: 389 since 23 April 2017
Information:

TABLE OF CONTENTS SPECIFICATION Page Introduction 1-1 Vertical Deflection System 1-1 Probe Performance 1-3 A and B Triggering 1-3 Horizontal Deflection 1-4 Calibrated Sweep Delay 1-4 X-Y 1-5 CRT 1-5 Calibrator 1-6 Other Characteristics 1-6 Environmental Characteristics 1-6 OPERATING INSTRUCTIONS General 2-1 Preliminary Information 2-1 Controls and Connections 2-1 Front Panel 2-1 Rear Panel 2-4 Bottom Side 2-4 CIRCUIT DESCRIPTION Introduction 3-1 50 n Attenuator 3-1 1 Megohm Buffer Amplifier 3-1 50 SI Overload Protection 3-1 Vertical Preamplifier 3-1 Signal Channel Switch 3-2 Internal Trigger Amplifier 3-2 Main Vertical Amplifier 3-2 Scale Factor Readout 3-3 Vertical Mode Control 3-3 Z Axis 3-3 A Trigger Amplifier 3-3 A EXT Trigger Identify 3-3 A Trigger Generator 3-4 B Trigger Generator 3-4 A and B Sweeps 3-4 Horizontal Amplifier 3-5 Horizontal Control 3-5 Power Inverter/Regulator 3-6 Line Filter 3-6 Line Input Circuit 3-6 Start Network 3-7 Inverter 3-8 Inverter/Regulator 3-8 Inverter Current Limiting Circuit 3-8 Overvoltage Stop Circuit 3-8 Line Stop Circuit and Surge Limiting 3-8 Procedure for Converting the 485 to DC Operation 3-9 Low Voltage Supplies 3-9 Power supply Protection Circuit 3-10 Stop Monostable 3-10 Balance Node 3-10 Overcurrent Protection 3-12 Low Line Voltage Protection 3-12 Sampling Period Timer and Over- Voltage Protection 3-12 CRT Circuit 3-12 Filament Voltage 3-12 High Voltage Supplies 3-12 Anode Supply 3-12 Cathode Supply 3-12 Cathode Regulator 3-12 Grid DC Restorer 3-13 SECTION 3 CIRCUIT DESCRIPTION (cont) Page Focus DC Restorer 3-13 Beam Current Limit 3-14 Power supply Shutdown Caused by Excessive Beam Current 3-14 CRT Control Circuits 3-14 Auto Focus Circuit 3-14 Calibrator 3-15 SECTION 4 MAINTENANCE Introduction 4-1 Cover Removal and Reinstallation 4-1 Cleaning 4-1 Lubrication 4-2 Visual Inspection 4-3 Semiconductor Checks 4-3 Recalibration 4-3 Troubleshooting 4-3 Introduction 4-3 Troubleshooting Aids 4-3 Circuit Boards 4-3 Troubleshooting Equipment 4-5 Troubleshooting Techniques 4-6 Special Troubleshooting Information 4-7 Corrective Maintenance 4-11 Obtaining Replacement Parts 4-11 Soldering Techniques 4-11 Component Replacement 4-12 Circuit Board Replacement 4-12 Timing Board Removal 4-12 Transformer Board Removal 4-13 Inverter Board Removal 4-14 Semiconductor Replacement 4-14 Circuit Board Pins 4-14 End Lead Pin Connectors 4-15 Cathode Ray Tube Replacement 4-15 Repackaging for Shipment 4-15 Interboard Comb Connection Locations 4-16 SECTION 5 CALIBRATION Introduction 5-1 Tektronix Field Service 5-1 Using This Procedure 5-1 Test Equipment Required 5-1 Special Calibration Fixtures 5-1 Calibration Equipment Alternatives 5-4 Performance Check 5-4 Calibration Procedure 5-8 SECTION 6 RACKMOUNTING Introduction 6-1 Rack Dimensions 6-1 Slide Out Tracks 6-1 Mounting Procedure 6-1 Alternate Rear Mounting Methods 6-2 Removing or Installing the Instrument 6-2 Slide Out Track Lubrication 6-2 SECTION 7 ELECTRICAL PARTS LIST

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