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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> | ||
Tek 7a42.jpg | |||
Tek 7a42 1.jpg | |||
Tek 7a42 2.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
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 |
|
Input impedance | 1 MΩ or 50 Ω |
Max. input voltage |
|
Trigger level |
|
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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