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{{Oscilloscope Sidebar|
{{Oscilloscope Sidebar
title=Tektronix 485|
|manufacturer=Tektronix
image=Tektronix 485 oscilloscope2.jpg|
|series=400-series scopes
caption=Tektronix 485|
|model=485
introduced=1972 |
|image=Tektronix 485 oscilloscope2.jpg
discontinued=1986 |
|caption=Tektronix 485
summary=350 MHz portable scope|
|introduced=1972
manuals=
|discontinued=1986
* [http://bama.edebris.com/download/tek/485/tek-485.pdf Tektronix 485 Manual (PDF)]
|summary=350 MHz portable scope
* [[Media:070-1193-00.pdf|Tektronix 485 Manual (PDF, OCR, bad-OCR)]]
|designers=John Addis;Wink Gross;Gene Andrews;Glenn Bateman;Ron Peltola;Bob Firth;Murlan Kaufman;Bob White;Keith Taylor;Dick Troberg
* [[Media:Tek 485 cal proc.pdf|Tektronix 485 Calibration Procedure (PDF)]]
|manuals=
 
* [[Media:070-1193-00.pdf|Tektronix 485 Manual]] (OCR)
* [[Media:070-1193-00 2.pdf|Tektronix 485 Manual]] (bad-OCR)
* [[Media:Tek 485 cal proc.pdf|Tektronix 485 Calibration Procedure]]
}}
}}
The '''Tektronix 485''' is a dual-trace, portable analog oscilloscope with a maximum  
The '''Tektronix 485''' is a dual-trace, portable analog oscilloscope with a maximum  
bandwidth of 350 MHz. The impedance of the inputs can be set individually to 50 Ω or 1 MΩ.   
bandwidth of 350 MHz, [[introduced in 1972|introduced in March of 1972]].
 
The impedance of the inputs can be set individually to 50 Ω or 1 MΩ.   
The scope achieves its maximum bandwidth when the inputs are in 50 Ω mode.   
The scope achieves its maximum bandwidth when the inputs are in 50 Ω mode.   
The 485 was [[introduced in 1972|introduced in March of 1972]].  It includes a switching
power supply and uses custom integrated circuits for most of the gain blocks. 
Triggering uses [[tunnel diodes]].


A distinguishing feature – at least in a portable oscilloscope of its period – is the Alternate Horizontal Mode.
A distinguishing feature – at least in a portable oscilloscope of its period – is the Alternate Horizontal Mode.
In this mode, the B timebase is shown in a separate full-width scan, as opposed to the more common Mixed Mode,  
In this mode, the B timebase is shown in a separate full-width scan, as opposed to the more common Mixed Mode, where the B timebase is shown on the same line as the A timebase, after the delay time.  
where the B timebase is shown on the same line as the A timebase, after the delay time. At the same time,
the section shown with the B timebase is shown highlighted in the A scan.


The [[465]], which was introduced after the 485, only received this feature in its "B" incarnation (465B).
The [[465]], which was introduced after the 485, only received this feature in its "B" incarnation (465B).
Variant 485-1 omits the "A EXT Trigger display", as does variant 485-2 which additionally only has 50 Ω inputs.
[[John Addis]] was project leader for the vertical section, assisted by [[Wink Gross]].
[[Glenn Bateman]], [[Ron Peltola]] and [[Bob Firth]] designed the low- and high-impedance attenuators.
[[Murlan Kaufman]] was project leader for the horizontal and logic systems and designed the trigger generator.
[[Bob White]] designed the trigger amplifier and external trigger view circuits.
[[Keith Taylor]] did the work on the fast sweeps, the horizontal and the Z-axis amplifiers.
[[Dick Troberg]] designed the high efficiency power supply system.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Rise time | 1 ns (50 Ω) / 1.4 ns (1 MΩ) }}
{{Spec | Input Impedance  | 50 Ω / 1 MΩ // 20 pF }}
{{Spec | Bandwidth | 350 MHz (50 Ω) / 250 MHz (1 MΩ) }}
{{Spec | Rise time       | 1 ns (50 Ω) / 1.4 ns (1 MΩ) }}
{{Spec | Deflection | 5 mV/div to 5 V/div in 1−2−5 sequence, 2% accuracy }}
{{Spec | Bandwidth       | 350 MHz (50 Ω) / 250 MHz (1 MΩ) }}
{{Spec | Time Base | 1 ns/div to 0.5 s/div in 1−2−5 sequence}}
{{Spec | Deflection       | 5 mV/div to 5 V/div in 1−2−5 sequence, 2% accuracy }}
{{Spec | Time Base       | 1 ns/div to 0.5 s/div in 1−2−5 sequence}}
{{Spec | CRT              | P31: [[154-0652-00]] / [[154-0652-05]] (B091500+); P11 (Opt.78): [[154-0652-04]] / [[154-0652-09]] (B091500+); 21 kV acceleration, 8 × 10 divisions (0.8 cm/div)}}
{{Spec | Calibrator      | 5 V into 1 MΩ / 0.5 V into 50 Ω / 50 mA using optional loop adapter, 1 kHz or 1 MHz, rise time less than 1 ns, output resistance 450 Ω }}
{{Spec | Outputs          | Positive gates from both time bases (~4 V), positive-going sawtooth from Time Base A (~10 V) }}
{{Spec | Weight          | 9.3 kg (21.5 lb) }}
{{Spec | Power            | AC 90–136 or 180–272 V, 48–440 Hz, 60 W @ 115V }}
{{EndSpecs}}
{{EndSpecs}}


==Links==
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/485.html Tek 485 @ amplifier.cd]
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/485.html Tek 485 @ amplifier.cd]
* [https://youtube.com/watch?v=7Qg6ory3L8Y 485 troubleshooting] @ YouTube
* [https://youtube.com/watch?v=7Qg6ory3L8Y 485 troubleshooting] by devttys0 @ YouTube
* [https://www.youtube.com/watch?v=P56MyUK3n18 485 Restoration and Repair] / [https://www.youtube.com/watch?v=95rlRAlRT5k 485 Power Supply and Tube Alignment] / [https://www.youtube.com/watch?v=mJa5jap968w 485 Horizontal Alignment] / [https://www.youtube.com/watch?v=lVsLMrCnOK4 485 Vertical and Trigger alignment] by Zenwizard Studios @ YouTube
{{Documents|Link=485}}
{{PatentLinks|485}}


==Maintenance issues==
==Prices==
A healthy Tek 485 CRT has been observed to have a filament current of 98 mA.
 
A broken Tek 485 CRT that lost its vacuum was observed to have a filament current of 153 mA.
{| class="wikitable"
|-
! Year
! 1972
! 1973
! 1976
! 1980
! 1982
! 1986
|-
! Catalog Price
|align=right| $4,200
|align=right| $4,200
|align=right| $4,550
|align=right| $6,035
|align=right| $6,975
|align=right| $9,100
|-
! In 2023 Dollars
|align=right| $30,900
|align=right| $29,100
|align=right| $24,600
|align=right| $22,500
|align=right| $22,200
|align=right| $25,600
|}
 
==Internals==
The 485 includes a switching power supply and uses [[155-0078-00|custom integrated circuits]] for most of the gain blocks. Triggering uses [[tunnel diodes]].


==Pictures==
==Pictures==
===External===
<gallery>
<gallery>
Tek 485 trace.jpg
Tek 485 trace.jpg
Tek_485_Trace.jpeg
Tektronix 485 oscilloscope2.jpg
Tektronix 485 oscilloscope2.jpg
Tek 485.jpg
Tek 485.jpg
Tek 485 front2.jpg
Tek 485 front2.jpg
Tek 485 front.jpg
Tek 485 front.jpg
Tek_485-rear.jpeg
Tek 485 rear.jpg
Tek 485 rear.jpg
Tektronix 485 oscilloscope5.jpg
Tektronix 485 oscilloscope5.jpg
Tek 485 tq.jpg
Tek 485 tq.jpg
Tek_485_A-Ext-Trig-Display.jpeg | Time base A, External trigger display switch
USA Tektronix 485 Inside1.jpg
USA Tektronix 485 Inside1.jpg
</gallery>
===Internals===
<gallery>
Tek_485-Top.jpeg | Top, Horizontal Amp board
Tek_485-Underside.jpeg | Underside, Power supply, A-Trig board
Tek_485-RHS.jpeg | LHS, Vertical Amp board
Tek_485-LHS.jpeg | RHS, Sweep/Inverter board
Tek_485-A-Trigger-bd.jpeg | A-Trigger board
Tek_485-attenuator-Assy.jpeg | Vertical attenuator Assy
Tek 485-attenuator-Inside.jpeg | Vertical attenuator Assy, 50Ω Board
Tek_485-Hi-Z-attenuator-bd.jpeg | Vertical attenuator Assy, Hi-Z Board
</gallery>
</gallery>


==Components==
{{Parts|485}}


[[Category:400 series scopes]]
[[Category:400 series scopes]]

Latest revision as of 03:40, 3 October 2024

Tektronix 485
350 MHz portable scope
Tektronix 485

Produced from 1972 to 1986

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 485 is a dual-trace, portable analog oscilloscope with a maximum bandwidth of 350 MHz, introduced in March of 1972.

The impedance of the inputs can be set individually to 50 Ω or 1 MΩ. The scope achieves its maximum bandwidth when the inputs are in 50 Ω mode.

A distinguishing feature – at least in a portable oscilloscope of its period – is the Alternate Horizontal Mode. In this mode, the B timebase is shown in a separate full-width scan, as opposed to the more common Mixed Mode, where the B timebase is shown on the same line as the A timebase, after the delay time.

The 465, which was introduced after the 485, only received this feature in its "B" incarnation (465B).

Variant 485-1 omits the "A EXT Trigger display", as does variant 485-2 which additionally only has 50 Ω inputs.

John Addis was project leader for the vertical section, assisted by Wink Gross. Glenn Bateman, Ron Peltola and Bob Firth designed the low- and high-impedance attenuators. Murlan Kaufman was project leader for the horizontal and logic systems and designed the trigger generator. Bob White designed the trigger amplifier and external trigger view circuits. Keith Taylor did the work on the fast sweeps, the horizontal and the Z-axis amplifiers. Dick Troberg designed the high efficiency power supply system.

Key Specifications

Input Impedance 50 Ω / 1 MΩ // 20 pF
Rise time 1 ns (50 Ω) / 1.4 ns (1 MΩ)
Bandwidth 350 MHz (50 Ω) / 250 MHz (1 MΩ)
Deflection 5 mV/div to 5 V/div in 1−2−5 sequence, 2% accuracy
Time Base 1 ns/div to 0.5 s/div in 1−2−5 sequence
CRT P31: 154-0652-00 / 154-0652-05 (B091500+); P11 (Opt.78): 154-0652-04 / 154-0652-09 (B091500+); 21 kV acceleration, 8 × 10 divisions (0.8 cm/div)
Calibrator 5 V into 1 MΩ / 0.5 V into 50 Ω / 50 mA using optional loop adapter, 1 kHz or 1 MHz, rise time less than 1 ns, output resistance 450 Ω
Outputs Positive gates from both time bases (~4 V), positive-going sawtooth from Time Base A (~10 V)
Weight 9.3 kg (21.5 lb)
Power AC 90–136 or 180–272 V, 48–440 Hz, 60 W @ 115V

Links

Documents Referencing 485

Document Class Title Authors Year Links
Tekscope 1972 V4 N2 Mar 1972.pdf Article A Nanosecond Portable Oscilloscope Gene Andrews 1972 485

Patents that may apply to 485

Page Title Inventors Filing date Grant date Links
Patent US 3906344A Oscilloscope having selectable input impedances John Addis • Ron Peltola 1974-04-04 1975-09-16 485

Prices

Year 1972 1973 1976 1980 1982 1986
Catalog Price $4,200 $4,200 $4,550 $6,035 $6,975 $9,100
In 2023 Dollars $30,900 $29,100 $24,600 $22,500 $22,200 $25,600

Internals

The 485 includes a switching power supply and uses custom integrated circuits for most of the gain blocks. Triggering uses tunnel diodes.

Pictures

External

  • Time base A, External trigger display switch

    Time base A, External trigger display switch

Internals

  • Top, Horizontal Amp board

    Top, Horizontal Amp board

  • Underside, Power supply, A-Trig board

    Underside, Power supply, A-Trig board

  • LHS, Vertical Amp board

    LHS, Vertical Amp board

  • RHS, Sweep/Inverter board

    RHS, Sweep/Inverter board

  • A-Trigger board

    A-Trigger board

  • Vertical attenuator Assy

    Vertical attenuator Assy

  • Vertical attenuator Assy, 50Ω Board

    Vertical attenuator Assy, 50Ω Board

  • Vertical attenuator Assy, Hi-Z Board

    Vertical attenuator Assy, Hi-Z Board

Components

Some Parts Used in the 485

Part Part Number(s) Class Description Used in
148-0034-01 148-0034-01 Discrete component miniature DPDT relay 485 • 7A12
154-0652-00 154-0652-00 • 154-0652-04 • 154-0652-05 • 154-0652-09 CRT CRT 485 • 485R • 485-1 • 485-2
155-0011-00 155-0011-00 Monolithic integrated circuit clock and chop blanking 485 • 7313 • 7403N • R7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • 7904A • R7903 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • AN/USM-281C
155-0012-00 155-0012-00 Monolithic integrated circuit Z Axis Logic 485 • 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • R7912 • 7934 • 7912AD • 7912HB • 7104 • R7103
155-0049-00 155-0049-00 • 155-0049-01 • 155-0049-02 Monolithic integrated circuit sweep control with lockout 335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C • 067-0657-00
155-0064-00 155-0064-00 Hybrid integrated circuit vertical output amplifier 7834 • 7854 • 7904 • R7903 • 7912AD • 485 • PG502
155-0067-02 155-0067-00 • 155-0067-02 • 155-0067-03 Monolithic integrated circuit SMPS controller 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001
155-0076-00 155-0076-00 Monolithic integrated circuit input protection and probe logic 465 • 485 • 7A29 • 7A29P • 11A52 • 11A71 • 11A72 • SCD1000
155-0078-00 155-0078-xx • 155-0273-00 • 155-0274-00 Monolithic integrated circuit broadband amplifier 464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010
2N5060 151-0503-00 Discrete component 30 V, 0.8 A thyristor (SCR) CG551AP • C50 • C51 • C52 • C53 • C70 • DC505 • DC505A • DC508 • DC508A • 1240 • 1241 • 212 • 213 • 214 • 4014 • 4015 • 4025 • 4027 • 4105 • 4106 • 4107 • 4109 • 4111 • 450 • 4623 • 4631 • 4632 • 4633A • 485 • 5D10 • 5223 • 7D10 • 7D11 • 7L12 • 7L13 • 7L14 • 7L18 • 7912AD • 91HS8
SMTD994 152-0177-01 Discrete component 10 mA, 2 pF tunnel diode 067-0587-01 • 067-0580-00 • 3T5 • 3T6 • 485 • 5S14N • 7D14 • 7T11 • 7T11A • S-53
SMTD998 152-0177-02 Discrete component 10 mA, 2 pF tunnel diode 067-0681-01 • 485 • 7B92 • 7B92A
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