7A42: Difference between revisions

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{{Plugin Sidebar 2|
{{Plugin Sidebar |
title=Tektronix 7A42|
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=[[7000-series scopes]]|
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&nbsp;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]], 300 MHz, 10 MΩ ×10 probe, and the [[P6230]], 1.5 GHz, 450/50 Ω ×10, variable-offset probe for ECL circuits.
Tektronix recommended the [[P6131]], 300&nbsp;MHz, 10 MΩ ×10 probe, and the [[P6230]], 1.5&nbsp;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 Also==
==See also==
* [[067-1155-99]]
* [[067-1155-99]]
* [[A6701]]
* [[A6701]]

Revision as of 03:36, 9 August 2021

Tektronix 7A42
350 MHz four-channel logic triggered amplifier
7A42 front view

Compatible with 7000-series scopes

Produced from 1984 to 1990

Manuals
Manuals – Specifications – Links – Pictures


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
  • 0.1 / 0.2 / 0.5 V/Div (TTL mode)
  • 20 / 50 / 100 mV/Div (ECL mode)
  • each direct or through 10:1 probe
Input impedance 1 MΩ or 50 Ω
Max. input voltage
  • at 1 MΩ: 25 V (DC+peak AC) below 36 MHz, down to 3 VAC at 300 MHz
  • at 50 Ω: 5 VRMS during any 1 ms interval
Trigger level
  • −1.27 to +1.28 V (TTL mode) in 10 mV steps
  • −254 mV to +256 mV (ECL mode) in 2 mV steps (or ×10)
Hysteresis 40 mV (TTL), 8 mV (ECL) (or ×10)
Features
  • NiCd battery to preserve front-panel control status
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