Equipment information

Tektronix 485 Oscilloscope
Model: 485
Category: Measurement instruments
Group: Oscilloscope

350 MHz at 5 mV/div 1 ns/div Sweep Rate 2.0 div/ns Writing Speed 1 MΩ & 50 Ω Input Impedances Input Protection 50 Ω Internal Automatic Deflection Factor Readout Pushbutton Ext Trigger View Battery Operation (Optional) Weighs »9.5 kg (21 lb) At just 21 pounds, the 1 ns/div, dual-trace, 350 MHz 485 Oscilloscope is highly compatible with today's increasing technology. Fast 2.0 div/ns writing speed makes it especially attractive for use in field research environments. The 485 features a wide bandwidth at its full 5 mV/div vertical sensitivity (350 MHz at 50 Ω and 250 MHz at 1 ΜΩ). Selectable input impedance provides the capability to measure low and high impedance points with the same scope and without active probes. Internal detection circuitry protects the 50 Ω input by automatically disconnecting when the signal exceeds approximately 50 V RMS. You no longer have to mentally compensate for attenuating probes. Automatic vertical scale-factor readout is provided by three light-emitting diodes located around the edge of each input attenuator knob. A quick glance tells the correct on-screen V/div when the recommended 10X or 100X probes are used. You always know exactly where you are in a pulse train when making a delayed sweep measurement. An alternate sweep mode allows the delayed sweep to appear alternately with the intensified main sweep. In this mode, you can view the intensified zone and the delayed display simultaneously. The external trigger signal can be easily viewed on the 485. A front-panel pushbutton automatically routes the external signal used to trigger time base A to the vertical deflection Amplifier. This feature can also be used to quickly make time comparisons between the signal of interest and the external trigger signal. On the 485, focus is always correct for single-shot photography. An autofocus circuit eliminates the need to readjust the focus each time the intensity is changed. When commercial power is not available, use the 1105 Battery Power Supply. It weighs only 19.5 pounds, and lets you take the high-per- formance 485 virtually anywhere.

These manuals are available for the above equipment:

Manual Type: Datasheet Tektronix-6478-Manual-Page-1-Picture
Pages: 3
Size: 328.67 Kbytes (336563 Bytes)
Language: english
Quality: Scanned document, all readable.
Upload date:
MD5: 06f7a17182a3c02f3d0a8dc51a95164d
Downloads: 598 since 28 November 2014


Manual Type: Service and User Manual Tektronix-8949-Manual-Page-1-Picture
Pages: 192
Size: 30.84 Mbytes (32335934 Bytes)
Language: english
Manual-ID/Number: 070-1193-00
Date: 01 January 1978
Quality: Scanned document, all readable.
Upload date:
MD5: 52bcf61ada3d76812f0af2e51d5cbdb9
Downloads: 444 since 23 April 2017

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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