The 7S12 TDR / Sampler ( $ 3, 390 in 1983 ) was a double-wide time domain reflectometry plug in; it needed both a sampling head ( such as the S-6 30 ps risetime 11.5 GHz pass through sampler, $ 2, 295 in 1983 ) and a pulse generator ( such as the S-52 25 ps risetime tunnel diode generator, $ 1, 655 in 1983 ).
