Equipment information:

Tektronix 485 Oscilloscope
Manufacturer:
Tektronix
Model: 485
Date:
Category: Measurement instruments
Group: Oscilloscope
Description: 350 MHz DUAL TRACE OSCILLOSCOPE
Information:
                                    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:

Tektronix -- 485 -- Datasheet
File name: Tektronix-6478-Manual-Page-1-Picture
Manual Type: Datasheet
Pages: 3
Size: 328.67 Kbytes (336563 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: 06f7a17182a3c02f3d0a8dc51a95164d
ed2kID: 6f7e6697bd442bca022a3e6ba47497a8
Downloads: 176 since 28 November 2014
Information:
Tektronix-6478-Manual-Page-1-Picture
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Tektronix -- 485 -- Service and User Manual
File name: Tektronix-8949-Manual-Page-1-Picture
Manual Type: Service and User Manual
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:
MD5: 52bcf61ada3d76812f0af2e51d5cbdb9
ed2kID: cc594e120281395b6801294dcba67682
Downloads: 0 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
Tektronix-8949-Manual-Page-1-Picture
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