2221
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.
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 |
|
| Options |
|
Links
- Troubleshooting tips on 2200 PSU
- Tektronix 2230 Family Marketing Presentation @ YouTube courtesy of the 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 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).
