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The Tektronix 7A42 is a four-channel 350 MHz plug-in for 7000-series.
{{Plugin Sidebar 2|
It supports triggering based on Boolean conditions of the four inputs.
title=Tektronix 7A42|
summary=350 MHz four-channel logic triggered amplifier|
image=Tek-7a42-crop.jpg |
caption=7A42 front view|
introduced=1984 |
discontinued=1990 |
series=[[7000-series scopes]]|
manuals=
* [http://w140.com/tek_7a42_service1_ocr.pdf 7A42 Service Manual Volume 1 (PDF)]
* [http://w140.com/tek_7a42_service2_ocr.pdf 7A42 Service Manual Volume 2 (PDF)]
* [[Media:Tek 7a42 advanced triggering techniques.pdf | 7A42 Advanced Triggering Techniques]]
}}
 
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]] 10 MΩ probe, and the [[P6230]] variable-offset 450 Ω probe for ECL circuits.
 
{{BeginSpecs}}
{{Spec | Bandwidth | 350 MHz}}
{{Spec | 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}}
{{Spec | Input impedance | 1 MΩ or 50 Ω}}
{{Spec | Max. input voltage |
* at 1 MΩ: 25 V (DC+peak AC) below 36 MHz, down to 3 V<sub>AC</sub> at 300 MHz
* at 50 Ω: 5 V<sub>RMS</sub> during any 1 ms interval}}
{{Spec | 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)}}
{{Spec | Hysteresis | 40 mV (TTL), 8 mV (ECL) (or ×10)}}
{{Spec | Features |
* NiCd battery to preserve front-panel control status}}
{{Spec | Weight | 2.8 kg / 6.2 lb}}
{{EndSpecs}}
 
==Internals==
The 7A42's functions are controlled by an [[Intel 8085]]A 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==
* [[067-1155-99]]
* [[A6701]]
* [[821]]
 
==Pictures==


<gallery>
<gallery>
Image:Tek 7a42 1.jpg
Tek 7a42.jpg
Image:Tek 7a42 2.jpg
Tek 7a42 1.jpg
Image:Tek 7a42 3.jpg
Tek 7a42 2.jpg
Image:Tek 7a42 4.jpg
Tek 7a42 3.jpg
Tek 7a42 4.jpg
Tek 7a42 fr1.jpg
Tek 7a42 fr2.jpg
Tek 7a42 fr3.jpg
Tek 7a42 fr4.jpg | display - four signal traces plus trigger view
Tek 7a42 fr5.jpg
Tek 7a42 fr6.jpg | 7A42 rear view
Tek 7a42 fr7.jpg | 7A42 top view
Tek 7a42 fr8.jpg | memory backup battery
Tek 7a42 fr9.jpg | internal switch mode PSU for digital logic supplies
Tek 7a42 fr10.jpg | microprocessor board
Tek 7a42 fr11.jpg | amplifier board front - attenuators, amplifiers, channel switches
Tek 7a42 fr12.jpg | amplifier board rear - channel switches, two 15 ns delay lines
Tek 7a42 11.jpg
Tek 7a42 12.jpg
Tek 7a42 13.jpg
Tek 7a42 14.jpg
Tek 7a42 15.jpg
</gallery>
</gallery>
[[Category:7000 series vertical plugins]]

Revision as of 07:49, 19 June 2020

Template:Plugin Sidebar 2

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 10 MΩ probe, and the P6230 variable-offset 450 Ω probe for ECL circuits.

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