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The Tektronix Type P plug-in is a step response calibrator [[introduced in 1962]] for [[500-series scopes]].   
The Tektronix Type P plug-in is a step response calibrator [[introduced in 1959]] for [[500-series scopes]].   
It applies a step signal to the vertical input (plug-in connector pins 1 and 3) of the scope.   
It applies a step signal to the vertical input (plug-in connector pins 1 and 3) of the scope.   
The step is generated by a [[mercury switch]] in the Type P and it has a 4 nanosecond risetime.   
The step is generated by a [[mercury switch]] in the Type P and it has a 4 nanosecond risetime.