221: Difference between revisions
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* [[Media:070-1573-01.pdf|Tektronix 221 Manual]] (OCR) | |||
* [[Media:070-1573-01.pdf|Tektronix 221 Manual]] ( | |||
* [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert]] | * [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert]] | ||
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==Internals== | ==Internals== | ||
The 221 has a switching power supply and built-in rechargeable batteries (which | The 221 has a switching power supply and built-in rechargeable batteries (which area maintenance issue). | ||
It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. | |||
would seem to preclude DC level-based triggering. The trigger circuit uses a | The trigger circuit uses a [[1N3713]] 1 mA [[tunnel diode]]. | ||
[[1N3713]] 1 mA [[tunnel diode]]. The vertical output amplifier | The vertical output amplifier that drives the CRT plates is two op-amps made from discrete transistors. | ||
that drives the CRT plates is two | |||
One drives the top deflection plate, the other the bottom plate. | One drives the top deflection plate, the other the bottom plate. | ||
The power supply in the 221 uses three transformers | The power supply in the 221 uses three transformers – [[120-0876-00]] (T633) in the line inverter, [[120-0877-00]]/[[120-0946-00]] (T623) in the base drive for the line inverter and [[120-0875-00]] (T701) in HV inverter. | ||
The 221 contains one integrated circuit, a 741 | The 221 contains one integrated circuit, a 741 op-amp that creates a virtual ground, otherwise only discrete (including dual) transistors. | ||
MOD 290A is a version of the 221 made for IBM | MOD 290A is a version of the 221 made for IBM which adds a Single Sweep function and a "Property of IBM" engraving. | ||
==Pictures== | ==Pictures== | ||
Revision as of 01:06, 14 November 2022
The Tektronix Type 221 is a miniature 5 MHz analog scope introduced in 1973.
Key Specifications
| Bandwidth | DC to 5 MHz |
|---|---|
| Input Impedance | 1 MΩ // 29 pF |
| Input Voltage | max. 600 V DC + Peak AC, or 600 Vp-p AC |
| Sweep Range | 200 ms to 1 μs, 17 steps |
| CRT | 154-0705-00, 6 Div (V) × 10 Div (H), 1 kV acceleration |
| Operating Time on Battery | 2-3 hours |
| Internal Battery | 10 rechargeable NiCd cells |
| Line Voltage | 90-250 VAC @ 48−62 Hz, or 80-250 VDC |
| Power Consumption | 5 W @ 250 V |
| Dimensions | (H/W/D) 3" × 5.25" × 9" (7.6 cm × 13.2 cm × 22.8 cm) |
| Weight | 3.5 lb (1.5 kg) |
Internals
The 221 has a switching power supply and built-in rechargeable batteries (which area maintenance issue). It has a transformer-coupled trigger circuit which would seem to preclude DC level-based triggering. The trigger circuit uses a 1N3713 1 mA tunnel diode. The vertical output amplifier that drives the CRT plates is two op-amps made from discrete transistors. One drives the top deflection plate, the other the bottom plate.
The power supply in the 221 uses three transformers – 120-0876-00 (T633) in the line inverter, 120-0877-00/120-0946-00 (T623) in the base drive for the line inverter and 120-0875-00 (T701) in HV inverter.
The 221 contains one integrated circuit, a 741 op-amp that creates a virtual ground, otherwise only discrete (including dual) transistors.
MOD 290A is a version of the 221 made for IBM which adds a Single Sweep function and a "Property of IBM" engraving.
Pictures
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Side
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Front
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Front
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Panel of 221
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Panel of 221
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Probe of 221
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221 with orginal bag
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221 on top of 565
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MOD 290A variant for IBM
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MOD 290A variant for IBM
Internals
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Tek 221 - Internals, rear
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Tek 221 - Internals, LHS
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Tek 221 - Internals, top
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Tek 221 - Front Panel A1/A2 board
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Tek 221 - CRT & power supply board
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Tek 221 - Power supply board
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Tek 221 - Power supply board
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Tek 221 - Amplifier board
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Battery pack (fused)
Some Parts Used in the 221
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 120-0876-00 | 120-0876-00 | Discrete component | pot core transformer | 221 |
| 154-0705-00 | 154-0705-00 | CRT | CRT for miniature scopes | 221 |
| STD933 | 152-0181-00 | Discrete component | 1 mA, 5 pF germanium tunnel diode | 1S2 • 221 • 422 |