Miniature universal oscilloscope S1-101 is designed to study the form of periodic electrical signals by visual observation and measurement of amplitudes in the range from 0.01 V to 300 V and time intervals from 0.3-10 - 6 s to 0.4 s. Frequency range from 0 to 5 MHz. According to metrological characteristics, oscilloscope S1-101 belongs to class III GOST 22737-77 "Electron beam oscilloscopes. Nomenclature of parameters and general technical requirements."