7A42: Difference between revisions
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* 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 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 | | ||
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==Internals== | ==Internals== | ||
The 7A42's functions are controlled by an | 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, | 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== | ==See Also== |
Revision as of 02:53, 23 December 2019
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 |
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Deflection |
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Input impedance | 1 MΩ or 50 Ω |
Max. input voltage |
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Trigger level |
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Hysteresis | 40 mV (TTL), 8 mV (ECL) (or ×10) |
Features |
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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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