7A22: Difference between revisions

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{{Plugin Sidebar 2|
{{Plugin Sidebar  
title=Tektronix 7A22 |
|manufacturer=Tektronix
summary=1 MHz differential amplifier |
|series=7000-series scopes
image=tek-7a22-front.jpg |  
|type=7A22
caption=7A22 front view |
|summary=1 MHz differential amplifier  
years=1969 – 2000 |
|image=tek-7a22-front.jpg  
introduced=1969 |
|caption=7A22 front view  
discontinued=2000 |
|introduced=1969  
series=[[7000-series scopes]]|
|discontinued=1991
manuals=
|designers=Val Garuts
* [http://bama.edebris.com/download/tek/7a22(2)/tek-7a22.pdf Tektronix 7A22 Manual (PDF)]
|manuals=
* [http://w140.com/smb/7a22_sm.pdf  Tektronix 7A22 Manual (OCR, PDF)]
* [[Media:070-0931-00.pdf|Tektronix 7A22 Manual]] (OCR)
* [http://bama.edebris.com/download/tek/7a22(2)/tek-7a22.pdf Tektronix 7A22 Manual @ BAMA]
* [[Media:TM-11-6625-2749-14&P.pdf| TM-11-6625-2749-14&P - 7A22 military manual]]
* [[Media:TB-9-6625-2132-35.pdf | TB 9-6625-2132-35 Calibration Procedure for AM-6881/U (7A13) and AM-6786/U (7A22)]]
}}
}}
The '''Textronix 7A22''' is a single channel differential vertical amplifier for the [[7000-series scopes|7000 series mainframes]], produced from about 1969 to 2000.  Specifications and controls are similar to the [[26A2]] and the [[3A9]] from the 560 series but without current probe input or front panel signal output.
The '''Tektronix 7A22''' is a single channel differential vertical amplifier for the [[7000-series scopes|7000 series mainframes]], designed by [[Val Garuts]] and produced from about 1969 to 1991.  Specifications and controls are similar to the [[26A2]] and the [[3A9]] from the 560 series but without current probe input nor front panel signal output.


Remarkably, the 7A22's input sensitivity reaches down to 10 μV/Div.  Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz.  A separate control optionally supplies an internal DC voltage to offset the DC signal component.  Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V.  Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges.
The 7A22's input sensitivity reaches down to 10 μV/Div.  Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz.  A separate control optionally supplies an internal DC voltage to offset the DC signal component.  Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V.  Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges.


Applications include audio, biological signals, etc.
Applications include audio, biological signals, sensors etc.


An example application is found in Jim Williams' [http://cds.linear.com/docs/en/application-note/an124f.pdf Application Note 124] – see Appendix D for a comparison of differential amplifiers.
An example application is found in [[Jim Williams]]' [http://cds.linear.com/docs/en/application-note/an124f.pdf LT Application Note 124] – see Appendix D for a comparison of differential amplifiers.
 
==Specifications==


{{BeginSpecs}}
{{BeginSpecs}}
Line 27: Line 28:
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
{{Spec | Signal ranges | }}
{{Spec | Signal ranges | }}
{| border=1 style="margin-left: 8em;" |
{| class="wikitable" border=1 style="margin-left: 8em;" |
!Range
!Range
! Differential signal
! Differential signal
Line 43: Line 44:
|}
|}
{{EndSpecs}}
{{EndSpecs}}
==Links==
{{Documents|Link=7A22}}
==Internals==
The differential amplifier design is a variant of the [[1A7A]] circuit, also used with modifications in the [[3A9]], [[5A22N]], [[AM502]], and [[5030]]/[[5031]] ([[26A2]] too?).
<blockquote>
[[John Addis]] [[Preamble DA1855|says]]:
The [[1A7A]] (designed by [[Thor Hallen]]) and the 7A22 (designed by [[Val Garuts]]) used essentially the same circuit. Exactly who came up with the brilliant input circuit is lost to history. The 1A7A came out first, but Thor had worked as evaluation engineer for Val Garuts (and is listed that way in the 7A22 Engineering Instrument Specification). Val does not remember who created the circuit, and Thor died in 2002.
</blockquote>


==Prices==
==Prices==
Line 48: Line 61:
|-
|-
! Year
! Year
! 1970
! 1971
! 1980
! 1980
! 1984
! 1984
Line 53: Line 68:
|-
|-
! Catalog price
! Catalog price
|align=right|  $500
|align=right|  $500
|align=right|  $500
|align=right| $1,060
|align=right| $1,060
Line 58: Line 74:
|align=right| $2,260
|align=right| $2,260
|-
|-
! 2014 value
! In 2023 Dollars
|align=right| $2,940
|align=right| $3,900
|align=right| $3,060
|align=right| $3,800
|align=right| $3,640
|align=right| $3,900
|align=right| $4,100
|align=right| $4,700
|align=right| $5,300
|-
|-
|}
|}
Line 68: Line 85:
==Pictures==
==Pictures==


===Plug-in===
<gallery>
Tek 7a22 5.jpg
Tek 7a22 front.jpg | 7A22 front view
Tek-7a22-front.jpg
7a22-left.jpg      | left side
7a22-left-ext.jpg  | left side (with cover)
7a22-right.jpg    | right side
</gallery>
===Measurements===
<gallery>
<gallery>
File:Tek 7a22 front.jpg
tri-1000k_w.jpg         | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=1 MHz
File:tri-1000k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=1 MHz
tri-100k_w.jpg         | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=100 kHz
File:tri-100k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=100 kHz
tri-10k_w.jpg           | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=10 kHz
File:tri-10k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=10 kHz
tri-1k_w.jpg           | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=1 kHz
File:tri-1k_w.jpg | 7A22: 1 kHz, 130 μV<sub>p-p</sub> triangle, BW=1 kHz
7a22-7613--tri-15uV.jpg | 15 μV p-p triangle wave displayed in variable-persistence storage mode on a [[7613]] for noise filtering
File:7a22-left.jpg | left side
File:7a22-left-ext.jpg | left side (with cover)
File:7a22-right.jpg | right side
</gallery>
</gallery>


[[Category:7000 series vertical plugins]]
[[Category:7000 series vertical plugins]]
[[Category:Differential amplifiers]]

Latest revision as of 23:44, 11 September 2024

Tektronix 7A22
1 MHz differential amplifier
7A22 front view

Compatible with 7000-series scopes

Produced from 1969 to 1991

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 7A22 is a single channel differential vertical amplifier for the 7000 series mainframes, designed by Val Garuts and produced from about 1969 to 1991. Specifications and controls are similar to the 26A2 and the 3A9 from the 560 series but without current probe input nor front panel signal output.

The 7A22's input sensitivity reaches down to 10 μV/Div. Bandwidth is 1 MHz, the upper 3 dB limit can be reduced in ×3 steps down to 100 Hz (to eliminate noise, inter alia), and the lower bandwidth can be raised in ×10 steps from 0.1 Hz to 10 kHz. A separate control optionally supplies an internal DC voltage to offset the DC signal component. Even in the most sensitive ranges (10 μV/Div to 10 mV/Div), common-mode voltage can be ±10 V. Input resistance is 1 MΩ, but for high source resistance DC coupled measurements, one can disconnect the internal gate return resistors of the input FETs, at the disadvantage of disabling the 20 mV/div and higher ranges.

Applications include audio, biological signals, sensors etc.

An example application is found in Jim Williams' LT Application Note 124 – see Appendix D for a comparison of differential amplifiers.

Key Specifications

Bandwidth 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 1 MHz in ×3/×10 steps
Deflection 10 μV/Div to 10 V/Div in 1–2–5 sequence
Input impedance 1 MΩ // 47 pF (either input)
Signal ranges
Range Differential signal DC Offset Common mode
10 μV/Div to 10 mV/Div ±1 V ±1 V ±10 V
20 mV/Div to 0.1 V/Div ±10 V ±10 V ±100 V
0.2 V/Div to 1 V/Div ±100 V ±100 V ±500 V
2 V/Div to 10 V/Div ±1000 V ±1000 V ±500 V

Links

Documents Referencing 7A22

Document Class Title Authors Year Links
Tekscope 1969 V1 N5 Oct 1969.pdf Article Introducing the New Generation 1969
Tekscope 1969 V1 N6 Dec 1969.pdf Article A New Logic for Oscilloscope Displays 1969
Tekscope 1971 V3 N2.pdf Article Measuring the Linearity of Fast Ramps John McCormick 1971
Tekscope 1972 V4 N5 Sep 1972.pdf Article A Practical Approach to Differential Amplifiers and Measurements Fred Beckett 1972
Tekscope 1972 V4 N6 Nov 1972.pdf Article Differential Amplifiers and Measurements, Part 2 Fred Beckett 1972
7000 series brochure March 1973.pdf Brochure 7000 series brochure, March 1973 1973

Internals

The differential amplifier design is a variant of the 1A7A circuit, also used with modifications in the 3A9, 5A22N, AM502, and 5030/5031 (26A2 too?).

John Addis says:

The 1A7A (designed by Thor Hallen) and the 7A22 (designed by Val Garuts) used essentially the same circuit. Exactly who came up with the brilliant input circuit is lost to history. The 1A7A came out first, but Thor had worked as evaluation engineer for Val Garuts (and is listed that way in the 7A22 Engineering Instrument Specification). Val does not remember who created the circuit, and Thor died in 2002.

Prices

Year 1970 1971 1980 1984 1990
Catalog price $500 $500 $1,060 $1,590 $2,260
In 2023 Dollars $3,900 $3,800 $3,900 $4,700 $5,300

Pictures

Plug-in

Measurements