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The 3T77 is a [[sampling_oscilloscope|sampling]] | The 3T77 is a [[sampling_oscilloscope|sampling]] | ||
sweep plug-in for [[560-series scopes]]. | sweep plug-in for [[560-series scopes]]. | ||
It was [[introduced in 1962]], along with the [[567]] | |||
and [[3S76]]. | |||
It triggers on either the internal trigger | It triggers on either the internal trigger | ||
pick-off from the vertical plug-in or from an external | pick-off from the vertical plug-in or from an external |