212
The Tektronix 212 is a small portable analog dual-trace CRT oscilloscope with a bandwidth of 500 kHz. The 212 "Miniscope" was developed by a group led by Dave Allen.
Key Specifications
| Bandwidth | 500 kHz (reduced to 400/300/100 kHz in 5/2/1 mV/Div ranges) |
|---|---|
| Deflection | 1 mV/Div to 50 V/Div, 1-2-5, and variable (up to 125 V/Div), or X-Y (X via Ch1) |
| Sweep | 500 ms/Div to 5 μS/Div, 1-2-5, and variable magnifier 1-5 × |
| Input impedance | 1 MΩ // 140 pF (160 pF below 100 mV/Div) |
| Trigger sensitivity | 0.2 Div internal, 1 V external (banana jack input) |
| CRT | 6 × 10 divisions of 0.203" (5.16 mm), 154-0699-00 tube, P31 phosphor, 1 kV acceleration |
| Power | 10 internal size A NiCd cells, 3-5 hour operation, or AC line, < 3 W |
Gerbers
Links
- Tektronix 212 Portable Scope Repair by NFM @ YouTube
Pictures
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Front
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Front right
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Right
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Rear right
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Left
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Bottom
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With manual
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Internal
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re-built battery pack
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Components
Some Parts Used in the 212
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 154-0699-00 | 154-0699-00 • 154-0699-50 | CRT | directly-heated CRT for miniature scopes | 211 • 212 • SC501 |
| 155-0047-00 | 155-0047-00 | Monolithic integrated circuit | dual variable-gain amplifier | 211 • 212 • 214 |
| 155-0048-01 | 155-0048-00 • 155-0048-01 • 155-0055-00 • 155-0055-01 | Monolithic integrated circuit | trigger sweep | 211 • 212 • 213 • 214 • 432 • 433 • 5B12N • 5B13N • 5L4N • 603 • 604 • 605 • 606 • 606A • 607 • 624 • SC501 • R7912 |
| 155-0083-00 | 155-0083-00 | Monolithic integrated circuit | dual operational amplifier and dual current source | 212 • 214 |
| 2N4851 | 151-0504-00 • 151-0504-01 | Discrete component | silicon unijunction transistor | DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • LA501 • R1330 • 212 • 214 • 4002A • 4623 • 4631 • 4632 • 4633A • 4634 • 4701 • 4701R • 670-0696-01 • 670-1274-00 • 670-1981-00 • 670-1981-01 • 7D01 • 7D12 • 7L12 |
| 2N5060 | 151-0503-00 | Discrete component | 30 V, 0.8 A thyristor (SCR) | CG551AP • C50 • C51 • C52 • C53 • C70 • DC505 • DC505A • DC508 • DC508A • 1240 • 1241 • 212 • 213 • 214 • 4014 • 4015 • 4025 • 4027 • 4105 • 4106 • 4107 • 4109 • 4111 • 450 • 4623 • 4631 • 4632 • 4633A • 485 • 5D10 • 5223 • 7D10 • 7D11 • 7L12 • 7L13 • 7L14 • 7L18 • 7912AD • 91HS8 |