221: Difference between revisions
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{{Spec | Bandwidth | DC to 5 MHz }} | {{Spec | Bandwidth | DC to 5 MHz }} | ||
{{Spec | Input Impedance | 1 MΩ // 29 pF }} | {{Spec | Input Impedance | 1 MΩ // 29 pF }} | ||
{{Spec | Input Voltage | max. | {{Spec | Input Voltage | max. 600 V DC + Peak AC, or 600 V<sub>p-p</sub> AC }} | ||
{{Spec | Sweep Range | 200 ms to 1 μs, 17 steps }} | {{Spec | Sweep Range | 200 ms to 1 μs, 17 steps }} | ||
{{Spec | CRT | [[154-0705-00]], 6(V) × 10(H) }} | {{Spec | CRT | [[154-0705-00]], 6 Div (V) × 10 Div (H) }} | ||
{{Spec | Operating Time on Battery | 2-3 | {{Spec | Operating Time on Battery | 2-3 hours }} | ||
{{Spec | Internal Battery | 10 | {{Spec | Internal Battery | 10 rechargeable NiCd cells }} | ||
{{Spec | Line Voltage | 90- | {{Spec | Line Voltage | 90-250 V<sub>AC</sub> @ 48−62 Hz, or 80-250 V<sub>DC</sub>}} | ||
{{Spec | Power Consumption | | {{Spec | Power Consumption | 5 W @ 250 V}} | ||
{{Spec | Dimensions | (H/W/D) 3" × 5.25" × 9" (7.6 cm | {{Spec | Dimensions | (H/W/D) 3" × 5.25" × 9" (7.6 cm × 13.2 cm × 22.8 cm) }} | ||
{{Spec | Weight | 3.5 | {{Spec | Weight | 3.5 lb (1.5 kg) }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Internals== | ==Internals== | ||
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drives the top deflection plate and the other drives the bottom plate. | drives the top deflection plate and the other drives the bottom plate. | ||
The power supply in 221 uses the [[120-0876-00]] transformer. | The power supply in the 221 uses the [[120-0876-00]] transformer. | ||
MOD 290A is found on a version made for IBM, which adds a Single Sweep function, and a "Property of IBM" engraving. | MOD 290A is found on a version made for IBM, which adds a Single Sweep function, and a "Property of IBM" engraving. | ||
Revision as of 10:33, 28 February 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) |
| 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 and the other drives the bottom plate.
The power supply in the 221 uses the 120-0876-00 transformer.
MOD 290A is found on a version made for IBM, which adds a Single Sweep function, and a "Property of IBM" engraving.
Pictures
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Front
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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
