7A12

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The Tektronix 7A12 is a 120MHz dual-trace vertical plug-in for 7000-series scopes. The 7A12 has relays in the signal path for the input attenuators. The relays are controlled by logic in the 7A12, which is controlled by switches on the front panel of the 7A12.

Front view
Attenuator schematic with relays

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