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{{Oscilloscope Sidebar |manufacturer=Tektronix |designers= |series=200-series scopes |
{{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
* [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)]
|discontinued=1991
* [[Media:Tek-221 2.pdf|Tektronix 221 Manual (PDF, unlocked)]]
|manuals=
 
* [[Media:070-1573-01.pdf|Tektronix 221 Manual]] (OCR)
* [[Media:070-1573-01.pdf|Tektronix 221 Manual (PDF, OCR, bad-OCR)]]
* [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert]]
* [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert (PDF)]]
}}
}}
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 | 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. 600V (DC + Peak AC)  or 600 V<sub>p-p</sub> AC  }}
{{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), 1 kV acceleration }}
{{Spec | Operating Time on Battery | 2-3 Hours }}
{{Spec | Operating Time on Battery | 2-3 hours }}
{{Spec | Internal Battery | 10 Rechargeable NiCd cells }}
{{Spec | Internal Battery | 10 rechargeable NiCd cells }}
{{Spec | Line Voltage | 90-250V <sub>AC</sub> 48 Hz - 62 Hz, 80-250V DC }}
{{Spec | Line Voltage | 90-250 V<sub>AC</sub> @ 48−62 Hz, or 80-250 V<sub>DC</sub>}}
{{Spec | Power Consumption | 5W @250 V}}
{{Spec | Power Consumption | 5 W @ 250 V}}
{{Spec | Dimensions  | (H/W/D) 3" × 5.25" × 9" (7.6 cm x 13.2 cm x 22.8 cm)  }}
{{Spec | Dimensions  | (H/W/D) 3" × 5.25" × 9" (7.6 cm × 13.2 cm × 22.8 cm)  }}
{{Spec | Weight | 3.5 lbs/1.5kg }}
{{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 are
The 221 has a switching power supply and built-in rechargeable batteries (which area maintenance issue).   
a maintenance issue).  It has a transformer-coupled trigger circuit which  
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_diodes|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 opamps made from discrete transistors.  One  
One drives the top deflection plate, the other 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 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.


MOD 290A is found on a version made for IBM, which adds a Single Sweep function, and a "Property of IBM" engraving.
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==
==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

Tektronix 221
5 MHz miniature analog scope
Tektronix 221

Produced from 1975 to 1991

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

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

    Side

  • Front

    Front

  • Front

    Front

  • Panel of 221

    Panel of 221

  • Panel of 221

    Panel of 221

  • Probe of 221

    Probe of 221

  • 221 with orginal bag

    221 with orginal bag

  • 221 on top of 565

    221 on top of 565

  • MOD 290A variant for IBM

    MOD 290A variant for IBM

  • MOD 290A variant for IBM

    MOD 290A variant for IBM

Internals

  • Tek 221 - Internals, rear

    Tek 221 - Internals, rear

  • Tek 221 - Internals, LHS

    Tek 221 - Internals, LHS

  • Tek 221 - Internals, top

    Tek 221 - Internals, top

  • Tek 221 - Front Panel A1/A2 board

    Tek 221 - Front Panel A1/A2 board

  • Tek 221 - CRT & power supply board

    Tek 221 - CRT & power supply board

  • Tek 221 - Power supply board

    Tek 221 - Power supply board

  • Tek 221 - Power supply board

    Tek 221 - Power supply board

  • Tek 221 - Amplifier board

    Tek 221 - Amplifier board

  • Battery pack (fused)

    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
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