I know in todays world we have more sophisticated equipment to measure the propagation delay of electronics equipment, but for my own curiosity i want to know how historically the propagation delay was measured for electronics device such as transistor. or in more simple words how pico seconds propagation delay is measured or experimentally verified or experimentally discovered in early days of electronics

 

Picosecond delays were measured on analog oscilloscopes using a delayed sweep technique. A repetitive test signal was applied to the DUT. On each successive sweep the test pulse was delayed incrementally in picosecond steps. In this manner, the complete picture was created over time. This was called a sampling oscilloscope. We had one made by Philips.

 

Picosecond delays were measured on analog oscilloscopes using a delayed sweep technique. A repetitive test signal was applied to the DUT. On each successive sweep the test pulse was delayed incrementally in picosecond steps. In this manner, the complete picture was created over time. This was called a sampling oscilloscope. We had one made by Philips.

Can you please give me the model number of that oscilloscope