221: Difference between revisions
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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 | |||
|manuals= | |||
* [[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 | |||
}} | }} | ||
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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{{Spec | Weight | 3.5 lb (1.5 kg) }} | {{Spec | Weight | 3.5 lb (1.5 kg) }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Links== | |||
{{Documents|Link=221}} | |||
==Prices== | |||
{| class="wikitable" | |||
|- | |||
! Year | |||
! 1976 | |||
! 1977 | |||
! 1980 | |||
! 1982 | |||
! 1986 | |||
|- | |||
! Catalog Price | |||
|align=right| $825 | |||
|align=right| $975 | |||
|align=right| $1,325 | |||
|align=right| $1,600 | |||
|align=right| $2,260 | |||
|- | |||
! In 2023 Dollars | |||
| $4,500 | |||
| $5,000 | |||
| $4,900 | |||
| $5,100 | |||
| $6,300 | |||
|} | |||
==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 the [[120- | 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== | ||
<gallery> | <gallery> | ||
Tek-221_1.jpeg | Side | |||
Tek-221_02.jpeg | Front | |||
Tek 221 1.jpg|Front | Tek 221 1.jpg|Front | ||
Tek 221 right.jpg|Panel of 221 | Tek 221 right.jpg|Panel of 221 | ||
Tek-221_3.jpeg | Panel of 221 | |||
Tek 221 probe.jpg|Probe of 221 | Tek 221 probe.jpg|Probe of 221 | ||
221-5.jpg|221 with orginal bag | 221-5.jpg|221 with orginal bag | ||
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221 Single_Sweep.jpg| MOD 290A variant for IBM | 221 Single_Sweep.jpg| MOD 290A variant for IBM | ||
</gallery> | </gallery> | ||
===Internals=== | |||
<gallery> | |||
Tek221_Int_01.jpeg| Tek 221 - Internals, rear | |||
Tek221_Int_02.jpeg| Tek 221 - Internals, LHS | |||
Tek221_Int_03.jpeg | Tek 221 - Internals, top | |||
Tek221_Int_04.jpeg | Tek 221 - Front Panel A1/A2 board | |||
Tek221_Int_05.jpeg | Tek 221 - CRT & power supply board | |||
Tek221_Int_06.jpeg | Tek 221 - Power supply board | |||
Tek221_Int_10.jpeg | Tek 221 - Power supply board | |||
Tek221_Int_07.jpeg | Tek 221 - Amplifier board | |||
Tek221_Int_08.jpeg | Battery pack (fused) | |||
</gallery> | |||
==Components== | |||
{{Parts|221}} | |||
[[Category:200 series scopes]] | [[Category:200 series scopes]] |
Latest revision as of 15:28, 27 October 2023
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) |
Links
Documents Referencing 221
Document | Class | Title | Authors | Year | Links |
---|---|---|---|---|---|
60AX-4741.pdf | Application Note | Floating Oscilloscope Measurements ... And Operator Protection | 1981 | A6901 • A6902 • 221 |
Prices
Year | 1976 | 1977 | 1980 | 1982 | 1986 |
---|---|---|---|---|---|
Catalog Price | $825 | $975 | $1,325 | $1,600 | $2,260 |
In 2023 Dollars | $4,500 | $5,000 | $4,900 | $5,100 | $6,300 |
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
-
Side
-
Front
-
Front
-
Panel of 221
-
Panel of 221
-
Probe of 221
-
221 with orginal bag
-
221 on top of 565
-
-
MOD 290A variant for IBM
-
MOD 290A variant for IBM
Internals
-
Tek 221 - Internals, rear
-
Tek 221 - Internals, LHS
-
Tek 221 - Internals, top
-
Tek 221 - Front Panel A1/A2 board
-
Tek 221 - CRT & power supply board
-
Tek 221 - Power supply board
-
Tek 221 - Power supply board
-
Tek 221 - Amplifier board
-
Battery pack (fused)
Components
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 |