7A42: Difference between revisions
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{{Plugin Sidebar | {{Plugin Sidebar | | ||
manufacturer=Tektronix | type=7A42| | |||
summary=350 MHz four-channel logic triggered amplifier| | summary=350 MHz four-channel logic triggered amplifier| | ||
image=Tek-7a42-crop.jpg | | image=Tek-7a42-crop.jpg | | ||
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introduced=1984 | | introduced=1984 | | ||
discontinued=1990 | | discontinued=1990 | | ||
series= | series=7000-series scopes| | ||
manuals= | manuals= | ||
* [https://w140.com/tek_7a42_service1_ocr.pdf 7A42 Service Vol. 1 (PDF)] | * [https://w140.com/tek_7a42_service1_ocr.pdf 7A42 Service Vol. 1 (PDF)] | ||
* [https://w140.com/tek_7a42_service2_ocr.pdf 7A42 Service Vol. 2 (PDF)] | * [https://w140.com/tek_7a42_service2_ocr.pdf 7A42 Service Vol. 2 (PDF)] | ||
* [[Media:Tek 7a42 advanced triggering techniques.pdf | 7A42 Advanced Triggering Techniques]] | * [[Media:Tek 7a42 advanced triggering techniques.pdf|7A42 Advanced Triggering Techniques]] | ||
* [[Media:070-4285-00.pdf|7A42 Operators Manual (PDF, manual needed)]] | * [[Media:070-4285-00.pdf|7A42 Operators Manual (PDF, manual needed)]] | ||
<small> | <small> | ||
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}} | }} | ||
The '''Tektronix 7A42''' is a four-channel 350 MHz plug-in for [[7000-series scopes]]. | The '''Tektronix 7A42''' is a four-channel 350 MHz plug-in for [[7000-series scopes]]. | ||
It was specifically designed for logic signals (TTL, ECL, CMOS) and supports triggering based on Boolean conditions of the four inputs. | It was specifically designed for logic signals (TTL, ECL, CMOS) and supports triggering based on Boolean conditions of the four inputs. | ||
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The input V/Div setting can only be seen in the mainframe's readout. | The input V/Div setting can only be seen in the mainframe's readout. | ||
Tektronix recommended the [[P6131]], | Tektronix recommended the [[P6131]], 300 MHz, 10 MΩ ×10 probe, and the [[P6230]], 1.5 GHz, 450/50 Ω ×10, variable-offset probe for ECL circuits. | ||
The [[067-1155-99]] calibration fixture is specific to the 7A42. | The [[067-1155-99]] calibration fixture is specific to the 7A42. | ||
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The 7A42 contains its own switch mode PSU, based on an SG3524 controller, that generates +5 V, −2 V and −5 V from the mainframe's ±50 V rails. | The 7A42 contains its own switch mode PSU, based on an SG3524 controller, that generates +5 V, −2 V and −5 V from the mainframe's ±50 V rails. | ||
==See | ==See also== | ||
* [[067-1155-99]] | * [[067-1155-99]] | ||
* [[A6701]] | * [[A6701]] | ||
Revision as of 02:36, 9 August 2021
The Tektronix 7A42 is a four-channel 350 MHz plug-in for 7000-series scopes.
It was specifically designed for logic signals (TTL, ECL, CMOS) and supports triggering based on Boolean conditions of the four inputs.
A fifth trace, "Trigger View", displays the trigger function output or external clock input.
The input V/Div setting can only be seen in the mainframe's readout.
Tektronix recommended the P6131, 300 MHz, 10 MΩ ×10 probe, and the P6230, 1.5 GHz, 450/50 Ω ×10, variable-offset probe for ECL circuits.
The 067-1155-99 calibration fixture is specific to the 7A42.
Key Specifications
| Bandwidth | 350 MHz |
|---|---|
| Deflection |
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| Input impedance | 1 MΩ or 50 Ω |
| Max. input voltage |
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| Trigger level |
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| Hysteresis | 40 mV (TTL), 8 mV (ECL) (or ×10) |
| Features |
|
| Weight | 2.8 kg / 6.2 lb |
Internals
The 7A42's functions are controlled by an Intel 8085A microprocessor.
Each of the four input attenuator circuits contains five miniature relays. The bistable relay coils are wired in a 4x5 matrix.
The 7A42 contains its own switch mode PSU, based on an SG3524 controller, that generates +5 V, −2 V and −5 V from the mainframe's ±50 V rails.
See also
Pictures
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display - four signal traces plus trigger view
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7A42 rear view
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7A42 top view
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memory backup battery
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internal switch mode PSU for digital logic supplies
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microprocessor board
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amplifier board front - attenuators, amplifiers, channel switches
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amplifier board rear - channel switches, two 15 ns delay lines
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