7A42: Difference between revisions
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The input V/Div setting can only be seen in the mainframe's readout. | The input V/Div setting can only be seen in the mainframe's readout. | ||
Tektronix recommended the [[P6131]] | 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. | The [[067-1155-99]] calibration fixture is specific to the 7A42. |
Revision as of 04:11, 17 July 2021
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 |
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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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