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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. | ||
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}} | ||
| 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== | ||
| Line 48: | 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]] | ||