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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 Mc (321) 6 Mc (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 kc. }}
{{Spec | Calibrator     | 0.5 V<sub>p-p</sub>, about 2 kHz }}
{{Spec | CRT | [[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, 20W }}
{{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. }}
{{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") }}
{{Spec | Weight | unknown, about 5 kg }}
{{Spec | Weight         | unknown, about 5 kg }}
{{Spec | Features |
{{Spec | Features |
* Ext Trig / X input (supports X-Y displays)
* Ext Trig / X input (supports X-Y displays)
* External blanking input (by deflection, not Z modulation)
* External blanking input (Z modulation)
* Built in battery
* Built-in battery
}}
}}
{{EndSpecs}}
{{EndSpecs}}
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DC supply.  The problem is, I have only the line cord, and not the
DC supply.  The problem is, I have only the line cord, and not the
DC cord.  The power input plugs on the scope are obviously
DC cord.  The power input plugs on the scope are obviously
custom, long predating the standard IEC plug everyone uses
custom, long predating the standard IEC plug everyone uses today.
today.


So I improvised.  The pin spacing for the 3-pin DC input plug is
So I improvised.  The pin spacing for the 3-pin DC input plug is
Line 71: Line 88:
</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>
Line 82: Line 99:
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 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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