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|introduced=1960 | |introduced=1960 | ||
|discontinued=1972 | |discontinued=1972 | ||
|designers=Oz Svehaug;Oliver Dalton; | |designers=Oz Svehaug;Oliver Dalton;Hiro Moriyasu | ||
|manuals= | |manuals= | ||
* [[Media:070-196.pdf|Tektronix 321 Manual]] | * [[Media:070-196.pdf|Tektronix 321 Manual 070-196]] | ||
* [ | * [[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 ( | * [[Media:Tek 321 irb.pdf|Tektronix 321 Instrument Reference Book]] (OCR) | ||
* [[Media:Tek 321a mod 128A.pdf|Tektronix 321A Mod 128A]] | * [[Media:Tek 321a mod 128A.pdf|Tektronix 321A Mod 128A]] | ||
* [[Media:070-0891-00.pdf|Tektronix 321A SN 6000 up ( | * [[Media:070-0891-00.pdf|Tektronix 321A SN 6000 up]] (OCR) | ||
* [[Media:321 announce.pdf|Tektronix 321 Announcement | * [[Media:321 announce.pdf|Tektronix 321 Announcement]] | ||
* [[Media:070-425.pdf|Tektronix 321A Manual ( | * [[Media:070-425.pdf|Tektronix 321A Manual]] (OCR) | ||
* [[Media:tek_321_fcp.pdf|Tektronix 321 factory calibration procedure ( | * [[Media:tek_321_fcp.pdf|Tektronix 321 factory calibration procedure]] (bad-OCR) | ||
* [[Media:Tek 321a fcp june 1968.pdf]] | * [[Media:Tek 321a fcp june 1968.pdf]] | ||
* [[Media:Tek 321 mod 797A.pdf]] | * [[Media:Tek 321 mod 797A.pdf]] | ||
* [[Media:Tek 321 mod 799F.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. | ||
Design work took place in 1959 and 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. | ||
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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, | {{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 | [[T3210]] or [[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 | | {{Spec | AC Power | 90–136 V or 180–272 V, 20 W }} | ||
{{Spec | DC Power | 11. | {{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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Tek 321a bottom.jpg|321A bottom view | 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]] |