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[[List_of_manuals_that_are_needed|Manual needed]].
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=2200-series scopes
|model=2221
|summary=60 (100) MHz portable DSO
|image=Tek 2221 front.JPG
|caption=Tektronix 2221
|introduced=1988
|discontinued=1990
|designers=
|manuals=
* [[Media:070-6531-00.pdf|Tektronix 2221 Service Manual]]
* [[Media:070-6530-00.pdf|Tektronix 2221 Operators Manual]] (OCR)


* [http://w140.com/tek_2230_2221_2220_desc.pdf Tektronix 2230/2221/2220 Description (PDF)]
<small>
* [http://w140.com/tek_2221a_user_manual.pdf Tektronix 2221A User Manual (PDF)]
'''Modifications '''
* [http://hakanh.com/dl/docs/kitinstructions/040-1344-00.pdf 040-1344-00 CRT Noise Reduction] (1991)


'''Other'''
* [[Media:2230_2221_2220.pdf|Tektronix 2230/2221/2220 Description]] (bad-OCR)
</small>
{{ROM Images}}
}}
The '''Tektronix 2221''' is a portable, 60 MHz, 20 MS/s combination analog / digital storage scope, sister model of [[2220]] and [[2230]].  It was [[introduced in 1988]].
The updated model '''[[2221A]]''' (1991) increased bandwidth to 100 MHz and 100 MS/s.
Recommended cart is the [[K212]].
{{BeginSpecs}}
{{Spec | Analog bandwidth | 60 MHz (50 MHz in 2 mV/Div range), 10 MHz limit switchable }}
{{Spec | Rise time (analog mode) | 5.8 ns (7 ns in 2 mV/Div range) }}
{{Spec | Sampling rate | 20 MS/s single channel, 10 MS/s in ALT or CHOP }}
{{Spec | Memory depth  | 4 K samples single channel, 2 K per channel in ALT or CHOP }}
{{Spec | Resolution | 8 bits }}
{{Spec | Deflection | 2 mV/Div to 5 V/Div, 1-2-5 }}
{{Spec | Glitch capture | > 100 ns}}
{{Spec | CRT | 8 x 10 cm, P31 phosphor, 14 kV acceleration }}
{{Spec | Outputs | analog X/Y plotter output, 500 mV/Div, pen lift relay contact }}
{{Spec | Power | 90-250 V, 85 W, fan-cooled }}
{{Spec | Weight | 8.2 kg (18 lb.) }}
{{Spec | Features |
* Reference waveform memory
* Cursors and readout
* Signal averaging
* TV line and field trigger
* Variable holdoff
}}
{{Spec | Options |
* Opt.10 – GPIB (board 671-0304-00)
* Opt.12 – RS232 (board 671-0303-00)
}}
{{EndSpecs}}
==Links==
* [http://www.hakanh.com/dl/docs/troubleshooting_tips_on_2200_ps.pdf Troubleshooting tips on 2200 PSU]
* [https://www.youtube.com/watch?v=n9qFlJmcxqo Tektronix 2230 Family Marketing Presentation] @ YouTube courtesy of the [https://vintagetek.org Vintage Tek Museum]
==Internals==
The 2221 is controlled by an [[Intel 8088]] microprocessor with firmware in a pair of 27512 EPROMs, and six TMS4426 16K×4 DRAMs. 
The A/D converter is a [[156-2248-00|Sony CX20052A]] (8 bit, 20 MHz, ECL output).  A pair of MCM2016H 2K×8, 70 ns RAMs serve as acquisition memory.
Custom Tek chips used include [[155-0274-00]] (A1U130, A1U180), [[155-0273-00]] (A2U30, A2U80), and [[155-0022-00]] (A10U2101).  There is also a semi-custom part (A10U9208 Display Controller, 156-2452-00).
==Pictures==
<gallery>
<gallery>
Image:Tek 2221 front.JPG
Tek 2221 front.JPG
Image:Tek 2221 front2.JPG
Tek 2221 front2.JPG
Image:Tek 2221 side.JPG
Tek 2221 side.JPG
Image:Tek 2221 rear.JPG
Tek 2221 rear.JPG
Image:Tek 2221 io.JPG
Tek 2221 io.JPG
Image:Tek 2221 ioclose.JPG
Tek 2221 ioclose.JPG
</gallery>
</gallery>
==Components==
{{Parts|2221}}
[[Category:2200 series scopes]]
[[Category:Digital storage scopes]]
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