7A22: Difference between revisions
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|designers=Val Garuts | |designers=Val Garuts | ||
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* [[Media:070-0931-00.pdf|Tektronix 7A22 Manual]] ( | * [[Media:070-0931-00.pdf|Tektronix 7A22 Manual]] (OCR) | ||
* [http://bama.edebris.com/download/tek/7a22(2)/tek-7a22.pdf Tektronix 7A22 Manual @ BAMA] | * [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: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)]] | * [[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 '''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 | 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. | ||
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. | ||
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{{EndSpecs}} | {{EndSpecs}} | ||
==Links== | |||
{{Documents|Link=7A22}} | |||
==Internals== | ==Internals== | ||
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[[John Addis]] [[Preamble DA1855|says]]: | [[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. Val does not remember who created the circuit, and Thor died in 2002. | 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> | </blockquote> | ||
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|align=right| $2,260 | |align=right| $2,260 | ||
|- | |- | ||
! In | ! In 2023 Dollars | ||
|align=right| $3, | |align=right| $3,900 | ||
|align=right| $3, | |align=right| $3,800 | ||
|align=right| $3, | |align=right| $3,900 | ||
|align=right| $4, | |align=right| $4,700 | ||
|align=right| $ | |align=right| $5,300 | ||
|- | |- | ||
|} | |} | ||
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===Plug-in=== | ===Plug-in=== | ||
<gallery> | <gallery> | ||
Tek 7a22 5.jpg | |||
Tek 7a22 front.jpg | 7A22 front view | Tek 7a22 front.jpg | 7A22 front view | ||
Tek-7a22-front.jpg | Tek-7a22-front.jpg | ||
7a22-left.jpg | left side | 7a22-left.jpg | left side | ||
7a22-left-ext.jpg | left side (with cover) | 7a22-left-ext.jpg | left side (with cover) | ||
Latest revision as of 23:44, 11 September 2024
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
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?).
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
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7A22 front view
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left side
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left side (with cover)
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right side
Measurements
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7A22: 1 kHz, 130 μVp-p triangle, BW=1 MHz
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7A22: 1 kHz, 130 μVp-p triangle, BW=100 kHz
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7A22: 1 kHz, 130 μVp-p triangle, BW=10 kHz
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7A22: 1 kHz, 130 μVp-p triangle, BW=1 kHz
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15 μV p-p triangle wave displayed in variable-persistence storage mode on a 7613 for noise filtering
