Norm Winningstad was hired by Tektronix and designed the Type N, Tektronix first sampling plug-in.  A sampling oscilloscope collects samples from successive cycles and assembles them to show a complete image of the waveform, thus increasing the bandwidth.  It was designed for the 500 series of oscilloscopes and was introduced in 1960.

The plug-in drives the oscilloscope in X-Y mode and so contains all of the necessary circuitry. The plug-in is fairly simple with a fixed sampling rate of 100 KHz, fixed vertical at 10 mV/Div, no delay line, and uses a single sampling diode. The Type 113 Delay Line could be added to the Type N. The Type N plug-in was soon replaced by the more-advanced 661 sampling oscilloscope the following year.

The museum has a Type N plug-in on exhibit which is displaying a sub-1 nS rise time. This specific Type N plug-in was owned by the designer Norm Winningstad. Norm later went on to head the Information Display Division, the first non-test and measurement division at Tektronix.


The museum was proud to host a tour for Norm's widow Dolores and his son Dennis. They are pictured here standing with Norm's Type N plug-in.