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.
|Input impedance||1MΩ or 50 Ω|
|Max. input voltage||
|Hysteresis||40 mV (TTL), 8 mV (ECL) (or ×10)|
|Weight||2.8 kg / 6.2 lb|
The 7A42's functions are controlled by an 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.