Tektronix 7S12

The 7S12 TDR/Sampler Without Sampling Heads Plug-in has vertical scales calibrated in mp (reflection coefficient 0.001) and mV from 2 to 500 units/div in 8 steps. The unit has a tape dial of 4900 ft, 490 ft, 49 ft (air dielectric); 3200 ft, 320 ft, 32 ft (polyethylene dielectric); and 10, 1, and 0.1 ?s (time). The unit also provides time/division settings of 20 ps to 1 ?s in 1-2-5 sequence.