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 | | ||
Line 6: | Line 6: | ||
introduced=1984 | | introduced=1984 | | ||
discontinued=1990 | | discontinued=1990 | | ||
series= | series=7000-series scopes| | ||
manuals= | manuals= | ||
* [ | * [[Media:070-4285-00.pdf|7A42 Operator Manual]] (OCR) | ||
* 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 | |||
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. | ||
Line 17: | Line 26: | ||
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 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}} | ||
{{Spec | Bandwidth | 350 MHz}} | {{Spec | Bandwidth | 350 MHz}} | ||
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 | | {{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 | * at 1 MΩ: 25 V (DC+peak AC) below 36 MHz, down to 3 V<sub>AC</sub> at 300 MHz | ||
* at | * 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 | ||
* | * −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 36: | Line 50: | ||
{{Spec | Weight | 2.8 kg / 6.2 lb}} | {{Spec | Weight | 2.8 kg / 6.2 lb}} | ||
{{EndSpecs}} | {{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== | ==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> | ||
{{Custom ICs|7A42}} | |||
[[Category:7000 series vertical plugins]] | [[Category:7000 series vertical plugins]] |
Revision as of 06:41, 10 March 2022
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 |
|
Input impedance | 1 MΩ // 15 pF 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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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 |