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{{Oscilloscope Sidebar |manufacturer=Tektronix | | {{Oscilloscope Sidebar | ||
model= 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 | ||
* [ | |summary=350 MHz portable scope | ||
* [[Media:Tek-485 OCR.pdf|Tektronix 485 Manual ( | |designers=John Addis;Wink Gross;Gene Andrews;Glenn Bateman;Ron Peltola;Bob Firth;Murlan Kaufman;Bob White;Keith Taylor;Dick Troberg | ||
* [ | |manuals= | ||
* [[Media:Tek 485 cal proc.pdf|Tektronix 485 Calibration Procedure | * [[Media:070-1193-00.pdf|Tektronix 485 Manual]] (bad-OCR) | ||
* [[Media:Tek-485 OCR.pdf|Tektronix 485 Manual]] (OCR) | |||
* [http://bama.edebris.com/download/tek/485/tek-485.pdf Tektronix 485 Manual] | |||
* [[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. | 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. | ||
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 | |||
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 | Input Impedance | 50 Ω / 1 MΩ // 20 pF }} | {{Spec | Input Impedance | 50 Ω / 1 MΩ // 20 pF }} | ||
{{Spec | Rise time | {{Spec | Rise time | 1 ns (50 Ω) / 1.4 ns (1 MΩ) }} | ||
{{Spec | Bandwidth | {{Spec | Bandwidth | 350 MHz (50 Ω) / 250 MHz (1 MΩ) }} | ||
{{Spec | Deflection | 5 mV/div to 5 V/div in 1−2−5 sequence, 2% accuracy }} | {{Spec | Deflection | 5 mV/div to 5 V/div in 1−2−5 sequence, 2% accuracy }} | ||
{{Spec | Time Base | {{Spec | Time Base | 1 ns/div to 0.5 s/div in 1−2−5 sequence}} | ||
{{Spec | CRT | [[154-0652-00]] and [[154-0652-05]], 21 kV acceleration, 8 × 10 divisions (0.8 cm/div)}} | |||
{{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== | ||
* [ | * [[Gene Andrews]], ''A nanosecond portable oscilloscope''. In [[Media:Tekscope_1972_V4_N2_Mar_1972.pdf|Tekscope Vol.4 No.2, March 1972]], p.2+. | ||
* [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] @ YouTube | ||
* [https://www.youtube.com/watch?v=P56MyUK3n18 485 Restoration and Repair] @ Zenwizard Studios YouTube | |||
* [https://www.youtube.com/watch?v=95rlRAlRT5k 485 Power Supply and Tube Alignment] @ Zenwizard Studios YouTube | |||
* [https://www.youtube.com/watch?v=mJa5jap968w 485 Horizontal Alignment] @ Zenwizard Studios YouTube | |||
* [https://www.youtube.com/watch?v=lVsLMrCnOK4 485 Vertical and Trigger alignment] @ Zenwizard Studios YouTube | |||
==Prices== | |||
{| 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]] |