Oscilloscope, dual beam cathode ray, Type 547, with plug-in modules (3), metal / plastic / glass, made by Tektronix Guernsey Ltd, Channel Islands, 1968, used by the Ultrasonics Institute, Sydney, New South Wales, Australia, probably 1968-1975
An oscilloscope (sometimes abbreviated CRO, for cathode-ray oscilloscope, or commonly just scope or O-scope) is a piece of electronic test equipment that allows signal voltages to be viewed, usually as a two-dimensional graph of one or more electrical potential differences (vertical axis) plotted as a function of time or of some other voltage (horizontal axis). The complete apparatus comprises a cathode ray tube which forms the measuring and indicating portion of the instrument, and a number of subsidiary units or circuits for providing suitable power supplies, for amplifying or attenuating the voltage to be measured, and for ensuring that the instantaneous values of that voltage are displayed on the screen in succession so that the trace takes the form of a graph in which the voltage is plotted against time.
This unit operates in a differential mode, with a plotting frequency of 50 mHz (milli hertz).
Included with the oscilloscope are 3 plug in modules
1x Type 547, four channel amplifier
1x Type Z, calibrated differential comparator
1x Type 1A1, dual trace
And also one electrical test lead.