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321: Difference between revisions
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title=Tektronix 321 | | title=Tektronix 321 | | ||
summary=Portable single channel scope | | summary=Portable single channel scope | | ||
image= | image=Tek 321 trace.jpg|321 front view | | ||
caption=Tek 321 front | | caption=Tek 321 front | | ||
introduced=1960 | | introduced=1960 | | ||
discontinued=1972 | | discontinued=1972 | | ||
manuals= | manuals= | ||
*[ | *[[Media:070-196.pdf|Tektronix 321 Manual]] | ||
*[http://bama.edebris.com/manuals/tek/321a/ Tektronix 321A manual] | *[http://bama.edebris.com/manuals/tek/321a/ Tektronix 321A manual] | ||
*[http://w140.com/tek_070-0425-01_type_321a_sn_100-5999_ocr.pdf Tektronix 321A Manual sn 100 to 5999 (PDF, OCR)] | |||
*[http://w140.com/tek_fcp/tek_type_321_factory_cal_proc.pdf Tektronix 321 factory calibration procedure] | *[http://w140.com/tek_fcp/tek_type_321_factory_cal_proc.pdf Tektronix 321 factory calibration procedure] | ||
*[[Media:Tek 321 irb.pdf|Tektronix 321 Instrument Reference Book (PDF, OCR)]] | |||
*Needed: 321A SN 6000 up | *Needed: 321A SN 6000 up | ||
* [[Media:070-425.pdf|Tektronix 321A Manual (PDF, OCR, bad-OCR)]] | |||
* [[Media:tek_321_fcp.pdf|Tektronix 321 factory calibration procedure (PDF, OCR, bad-OCR)]] | |||
* [[Media:Tek 321a fcp june 1968.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. | ||
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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. | ||
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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. | ||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | 5 MHz (321) / 6 MHz (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 | Deflection | 10 mV/Div to 20 V/Div }} | |||
{{Spec | Input impedance | 1 MΩ // 35 pF }} | |||
{{Spec | Calibrator | 0.5 V<sub>p-p</sub>, about 2 kHz }} | |||
{{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 | 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 | Dimensions | 21.67 cm × 14.6 cm × 40 cm (8.5" × 5.75" × 16") }} | |||
{{Spec | Weight | unknown, about 5 kg }} | |||
{{Spec | Features | | |||
* Ext Trig / X input (supports X-Y displays) | |||
* External blanking input (Z modulation) | |||
* Built-in battery | |||
}} | |||
{{EndSpecs}} | |||
==External Power Connector== | ==External Power Connector== | ||
Douglas W Jones wrote: | Douglas W Jones wrote: | ||
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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 | ||
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</blockquote> | </blockquote> | ||
<div style="padding-left: 3em;"><gallery> | <div style="padding-left: 3em;"><gallery> | ||
Dwj tek 321 ps connector.jpg|321 External Power Connector | |||
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> | ||
tek-321-front.jpg | 321 rectangular front | |||
tek-321-round-front.jpg | 321 round front | |||
tek-321-round-vs-rect.jpg | 321 round vs. rectangular models | |||
321_pair.JPG | 321 and 321A | |||
321_front.jpg|321 front view | |||
321_right_case.jpg|321 right case | |||
321_left_internal.jpg|321 left internal | |||
321_right_internal.jpg|321 right internal | |||
321_rear.jpg|321 rear view | |||
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> | ||