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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar  
title=Tektronix 321 |
|manufacturer=Tektronix
summary=Portable single channel scope |
|series=300-series scopes
image=tek-321-front.jpg|321 front view |
|model=321  
caption=Tek 321 front |
|summary=Portable single channel scope  
introduced=1960 |
|image=Tek 321 trace.jpg|321 front view  
discontinued=1972 |
|caption=Tek 321 front  
manuals=
|introduced=1960  
*[http://elektrotanya.com/tektronix_321.pdf/download.html Tektronix 321 Manual]
|discontinued=1972  
*[http://bama.edebris.com/manuals/tek/321a/ Tektronix 321A manual]
|designers=Oz Svehaug;Oliver Dalton;Hiro Moriyasu
*[http://w140.com/tek_070-0425-01_type_321a_sn_100-5999_ocr.pdf Tektronix 321A Manual sn 100 to 5999 (PDF)]
|manuals=
*[http://w140.com/tek_fcp/tek_type_321_factory_cal_proc.pdf Tektronix 321 factory calibration procedure]
* [[Media:070-196.pdf|Tektronix 321 Manual 070-196]]
*Needed: 321A SN 6000 up
* [[Media:070-0425-01.pdf|Tektronix 321A Manual 070-0425-01]] S/N 100-5999 (OCR)
* [[Media:Tek 321 irb.pdf|Tektronix 321 Instrument Reference Book]] (OCR)
* [[Media:Tek 321a mod 128A.pdf|Tektronix 321A Mod 128A]]
* [[Media:070-0891-00.pdf|Tektronix 321A SN 6000 up]] (OCR)
* [[Media:321 announce.pdf|Tektronix 321 Announcement]]
* [[Media:070-425.pdf|Tektronix 321A Manual]] (OCR)
* [[Media:tek_321_fcp.pdf|Tektronix 321 factory calibration procedure]] (bad-OCR)
* [[Media:Tek 321a fcp june 1968.pdf]]
* [[Media:Tek 321 mod 797A.pdf]]
* [[Media:Tek 321 mod 799F.pdf]]
* [[Media:Tek 321 single sweep lockout early schematics.pdf]]
* [[Media:Early tek 321 schematics.pdf]]
}}
}}
The '''Tektronix 321''' is a very compact single-trace, single-timebase portable oscilloscope that is almost completely solid state.   
The '''Tektronix 321''' is a very compact single-trace, single-timebase portable oscilloscope that is almost completely solid state.   
It was [[introduced in 1960|introduced on April 8th, 1960]].
Design work took place in 1959 and it was [[introduced in 1960|introduced on April 8th, 1960]].
It was designed by [[Oz Svehaug]], [[Oliver Dalton]], and [[Hiro Moriyasu]].


The 321 includes several germanium bipolar transistors, which are a known reliability problem.   
The 321 includes several germanium bipolar transistors, which are a known reliability problem.   


The 321A was [[introduced in 1964]].  The 321 and 321A have slightly different circuits.   
The '''321A''' was [[introduced in 1964]].  The 321 and 321A have slightly different circuits.   
Early instances of the 321 (sn pre-720) use a [[5718]] peanut tube as the front-end cathode follower.   
Early instances of the 321 (sn pre-720) use a [[5718]] peanut tube as the front-end cathode follower.   


Later 321 and 321A use a [[7586]] Nuvistor for that role. Latest 321A (SN6000 up) use a FET [[151-1011-01]].
Later 321 and 321A use a [[7586]] Nuvistor for that role. Latest 321A (SN6000 up) use a FET [[151-1011-01]].
In several circuits, the 321 uses [[OC170]] transistors where the 321A uses [[2N2207]] transistors.
In several circuits, the 321 uses [[OC170]] transistors where the 321A uses [[2N2207]] transistors.
 
==Power Supply==
The 321 uses a DC-DC converter to generate the DC voltages needed for the scope.
Prior to serial number 720, 321s used the [[120-153]] transformer along with a separate high voltage power supply with its own transformer
the +3350 V CRT anode voltage.
Starting at serial number 720, all DC voltages (including the CRT anode voltage, via a voltage multiplier) are generated by a single power supply
based on the [[120-210]] transformer.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth      | 5 MHz (321) / 6 MHz (321A)  }}
{{Spec | Bandwidth      | 5 MHz (321) / 6 MHz (321A)  }}
{{Spec | Rise time      | 70 ns (321) / 64 ns (321A)  }}
{{Spec | Rise time      | 70 ns (321) / 64 ns (321A)  }}
{{Spec | Sweep          | 0.5 μs/Div to 0.5 s/Div, 1—2—5, ×5 magnifier (i.e. to 50 ns/Div) }}
{{Spec | Sweep          | 0.5 μs/Div to 0.5 s/Div, 1–2–5, ×5 magnifier (i.e. to 50 ns/Div) }}
{{Spec | Deflection      | 10 mV/Div to 20 V/Div }}
{{Spec | Deflection      | 10 mV/Div to 20 V/Div }}
{{Spec | Input impedance | 1 MΩ // 35 pF }}
{{Spec | Input impedance | 1 MΩ // 35 pF }}
{{Spec | Calibrator      | 0.5 V<sub>p-p</sub>, about 2 kHz  }}
{{Spec | Calibrator      | 0.5 V<sub>p-p</sub>, about 2 kHz  }}
{{Spec | CRT            | [[154-433|T3211-31]] or [[154-433]], P31 phosphor, 10 × 6 Div. @ 6.25 mm (0.25"), 4 kV acceleration }}
{{Spec | CRT            | [[T3210]] or [[154-433|T3211-31]] or [[154-433]], P31 phosphor, 10 × 6 Div. @ 6.25 mm (0.25"), 4 kV acceleration }}
{{Spec | AC Power        | 90—136 V or 180—272 V, 20 W }}
{{Spec | AC Power        | 90–136 V or 180–272 V, 20 W }}
{{Spec | DC Power        | 11.5—35 V, 8.5 W min., 24.5 W max., 700 mA current typ. }}
{{Spec | DC Power        | 11.5–35 V, 8.5 W min., 24.5 W max., 700 mA current typ. }}
{{Spec | Battery        | Ten size "D" NiCd cells, runtime 5 h (4 Ah cells), 3 h (2.5 Ah cells), charge time 16 h }}
{{Spec | Battery        | Ten size "D" NiCd cells, runtime 5 h (4 Ah cells), 3 h (2.5 Ah cells), charge time 16 h }}
{{Spec | Dimensions      | 21.67 cm × 14.6 cm × 40 cm (8.5" × 5.75" × 16") }}
{{Spec | Dimensions      | 21.67 cm × 14.6 cm × 40 cm (8.5" × 5.75" × 16") }}
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</blockquote>
</blockquote>
<div style="padding-left: 3em;"><gallery>
<div style="padding-left: 3em;"><gallery>
File:Dwj tek 321 ps connector.jpg|321 External Power Connector
Dwj tek 321 ps connector.jpg|321 External Power Connector
File:Dwj tek 321 ps cable.jpg|Douglas W Jones' 321 External Power Cable
Dwj tek 321 ps cable.jpg|Douglas W Jones' 321 External Power Cable
</gallery></div>
</gallery></div>
<blockquote>
<blockquote>
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18V — this is because the 321 uses a linear regulator.
18V — this is because the 321 uses a linear regulator.
</blockquote>
</blockquote>
 
==Links==
* [https://sites.google.com/site/johnengsdeadtechrescue/photos/john-s-ideas-to-restore-dead-technology/repair-challenge-tektronix-321-oscilloscope--the-first-transistor-oscilloscope Repair Challenge Tektronix 321 Oscilloscope]
==Pictures==
==Pictures==


<gallery>
<gallery>
File:tek-321-front.jpg | 321 rectangular front
tek-321-front.jpg | 321 rectangular front
File:tek-321-round-front.jpg | 321 round front  
tek-321-round-front.jpg | 321 round front  
File:tek-321-round-vs-rect.jpg | 321 round vs. rectangular models
tek-321-round-vs-rect.jpg | 321 round vs. rectangular models
File:321_front.jpg|321 front view
321_pair.JPG | 321 and 321A
File:321_right_case.jpg|321 right case
321_front.jpg|321 front view
File:321_left_internal.jpg|321 left internal
321_right_case.jpg|321 right case
File:321_right_internal.jpg|321 right internal
321_left_internal.jpg|321 left internal
File:321_rear.jpg|321 rear view
321_right_internal.jpg|321 right internal
File:Tek 321 round.jpg|321 with round bezel
321_rear.jpg|321 rear view
File:321A_FET.JPG|Latest 321A´s frontend.
Tek 321 round.jpg|321 with round bezel
321A_FET.JPG|Latest 321A's frontend
Tek 321a trace.jpg|321A trace
Tek 321a trace.jpg|321A trace
Tek 321a trace2.jpg|321A trace
321SN1557.jpg|321 with no model number on panel
Tek 321a bottom.jpg|321A bottom view
</gallery>
</gallery>
{{Parts|321}}
{{Parts|321A}}


[[Category:Portable scopes]]
[[Category:Portable scopes]]
[[Category:300 series scopes]]
[[Category:300 series scopes]]
[[Category:Manual needed]]
[[Category:Specifications needed]]
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