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visual voltmeter with a timer that shows when a voltage changed ✔✔osciloscope
uses a cathode ray tube similar to a tv screen ✔✔analog scope
takes samples of the signals that can be stopped or stored ✔✔digital scope
transparent scale used for reference measurements ✔✔gratiucule
setting how much time will be displayed in each block ✔✔division
displays both alternating and direct current ✔✔DC coupling
a DC voltage that turns on and off in a series of pulses ✔✔pulse train
frequency is measured in this ✔✔hertz