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{{Oscilloscope Sidebar |manufacturer=Tektronix | {{Oscilloscope Sidebar | ||
model= 221 | | |manufacturer=Tektronix | ||
summary=5 MHz miniature analog scope | | |series=200-series scopes | ||
image=Tek 221 1.jpg | | |model=221 | ||
caption=Tektronix 221 | | |summary=5 MHz miniature analog scope | ||
introduced=1975 | | |image=Tek 221 1.jpg | ||
discontinued=1991 | | |caption=Tektronix 221 | ||
manuals= | |introduced=1975 | ||
|discontinued=1991 | |||
* [[Media:Tek-221 2.pdf|Tektronix 221 Manual ( | |manuals= | ||
* [[Media:Tek-221 2.pdf|Tektronix 221 Manual]] (unlocked) | |||
* [[Media:070-1573-01.pdf|Tektronix 221 Manual ( | * [[Media:070-1573-01.pdf|Tektronix 221 Manual]] (bad-OCR) | ||
* [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert | * [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert]] | ||
}} | }} | ||
The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | ||
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</gallery> | </gallery> | ||
{{Parts|221}} | |||
[[Category:200 series scopes]] | [[Category:200 series scopes]] | ||
Revision as of 00:37, 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 are a 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 opamps 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 opamp 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 |