noun
cathode-ray oscilloscope
Technical term for an electronic instrument that displays waveforms using a cathode-ray tube; used in electronics and physics.
陰極線オシロスコープで信号の波形を観測した。
We observed the signal waveform with a cathode-ray oscilloscope.
General term for oscilloscope; 陰極線オシロスコープ specifically refers to the older cathode-ray tube type, while modern digital oscilloscopes are often just called オシロスコープ.
Compound of 陰極線 (cathode ray) and オシロスコープ (oscilloscope), a loanword from English.