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 |  
Line 6: Line 6:
introduced=1984 |
introduced=1984 |
discontinued=1990 |
discontinued=1990 |
series=[[7000-series scopes]]|
series=7000-series scopes|
manuals=
manuals=
* [http://w140.com/tek_7a42_service1_ocr.pdf 7A42 Service Manual Volume 1 (PDF)]
* [[Media:070-4285-00.pdf|7A42 Operator Manual]] (OCR)
* [http://w140.com/tek_7a42_service2_ocr.pdf 7A42 Service Manual Volume 2 (PDF)]
* 7A42 Service Manual
** [[Media:070-4286-00.pdf|070-4286-00 Volume 1]] (OCR)
** [[Media:070-4654-00.pdf|070-4654-00 Volume 2, Signature Analysis Tables]] (OCR)
* [[Media:Tek 7a42 advanced triggering techniques.pdf|7A42 Advanced Triggering Techniques]]
<small>
'''ROM images'''
* [[Media:160-1959-00.bin|160-1959-00.bin A8U145]]
* [[Media:160-1960-00.bin|160-1960-00.bin A8U245]]
* [[Media:160-1961-00.bin|160-1961-00.bin A8U340]]
</small>
}}
}}
 
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.


A fifth trace, "Trigger View", displays the trigger function output or external clock input.
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&nbsp;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.


{{BeginSpecs}}
{{BeginSpecs}}
Line 24: Line 38:
* 20 / 50 / 100 mV/Div (ECL mode)
* 20 / 50 / 100 mV/Div (ECL mode)
* each direct or through 10:1 probe}}
* each direct or through 10:1 probe}}
{{Spec | Input impedance | 1MΩ or 50 Ω}}
{{Spec | Input impedance | 1 MΩ // 15 pF or 50 Ω}}
{{Spec | Max. input voltage |
{{Spec | Max. input voltage |
* at 1 MΩ: 25 V DC+peak AC below 36 MHz, down to 3 V AC at 300 MHz
* at 1 MΩ: 25 V (DC+peak AC) below 36 MHz, down to 3 V<sub>AC</sub> at 300 MHz
* at 50Ω: 5 V RMS during any 1 ms interval}}
* at 50 Ω: 5 V<sub>RMS</sub> during any 1 ms interval}}
{{Spec | Trigger level |
{{Spec | Trigger level |
* -1.27 to +1.28 V (TTL mode) in 10 mV steps
* −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)}}
* −254 mV to +256 mV (ECL mode) in 2 mV steps (or ×10)}}
{{Spec | Hysteresis | 40 mV (TTL), 8 mV (ECL) (or ×10)}}
{{Spec | Hysteresis | 40 mV (TTL), 8 mV (ECL) (or ×10)}}
{{Spec | Features |
{{Spec | Features |
Line 38: Line 52:


==Internals==
==Internals==
The 7A42's functions are controlled by an 8085A microprocessor.
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.
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.
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==
==Pictures==
Line 55: Line 74:
Tek 7a42 fr2.jpg
Tek 7a42 fr2.jpg
Tek 7a42 fr3.jpg
Tek 7a42 fr3.jpg
Tek 7a42 fr4.jpg
Tek 7a42 fr4.jpg | display - four signal traces plus trigger view
Tek 7a42 fr5.jpg
Tek 7a42 fr5.jpg
Tek 7a42 fr6.jpg
Tek 7a42 fr6.jpg | 7A42 rear view
Tek 7a42 fr7.jpg
Tek 7a42 fr7.jpg | 7A42 top view
Tek 7a42 fr8.jpg
Tek 7a42 fr8.jpg | memory backup battery
Tek 7a42 fr9.jpg
Tek 7a42 fr9.jpg | internal switch mode PSU for digital logic supplies
Tek 7a42 fr10.jpg
Tek 7a42 fr10.jpg | microprocessor board
Tek 7a42 fr11.jpg
Tek 7a42 fr11.jpg | amplifier board front - attenuators, amplifiers, channel switches
Tek 7a42 fr12.jpg
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>


{{Custom ICs|7A42}}


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

Revision as of 06:41, 10 March 2022

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 // 15 pF 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

Custom ICs used in the 7A42

Page Model Part nos Description Designers Used in
155-0038-01 155-0038-01 155-0038-00 155-0038-01 5-bit current source D/A converter Mike Metcalf 7A42 7D13 7D14 7M13 T4005
155-0078-00 M084 155-0078-xx 155-0273-00 155-0274-00 broadband amplifier John Addis 464 465 466 468 475 475A 475M 485 7834 7844 7854 7904 R7903 R7912 7912AD 7912HB 7104 7A16A 7A16P 7A24 7A26 7A42 067-0587-01 067-0680-00 AM503 PG502 PG508 DC510 DC5010 FG5010
155-0236-00 155-0236-00 155-0236-00 channel switch 2445 2465 7A42