2221

Manuals – Specifications – Links – Pictures

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.

The recommended cart is the K212.

Key Specifications

Analog bandwidth	60 MHz (50 MHz in 2 mV/Div range), 10 MHz limit switchable
Rise time (analog mode)	5.8 ns (7 ns in 2 mV/Div range)
Sampling rate	20 MS/s single channel, 10 MS/s in ALT or CHOP
Memory depth	4 K samples single channel, 2 K per channel in ALT or CHOP
Resolution	8 bits
Deflection	2 mV/Div to 5 V/Div, 1-2-5
Glitch capture	> 100 ns
CRT	8 x 10 cm, P31 phosphor, 14 kV acceleration
Outputs	analog X/Y plotter output, 500 mV/Div, pen lift relay contact
Power	90-250 V, 85 W, fan-cooled
Weight	8.2 kg (18 lb.)
Features	Reference waveform memory Cursors and readout Signal averaging TV line and field trigger Variable holdoff
Options	Opt.10 – GPIB (board 671-0304-00) Opt.12 – RS232 (board 671-0303-00)

Links

• Troubleshooting tips on 2200 PSU
• Tektronix 2230 Family Marketing Presentation @ YouTube courtesy of the Vintage Tek Museum

Documents Referencing 2221

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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 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

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