Oscilloscope, dual beam differential cathode ray, Type 502A, metal / plastic / glass / perspex, made by Tektronix Guernsey Ltd, Channel Islands, 1963-1969, used by Macquarie University, Sydney, New South Wales, Australia, [1967-1970]
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.
Type 502A was introduced in 1963 by Tektronix Australia Pty Ltd. The unit has a maximum band width of 1 MHz, dual differential channels, X-Y curve tracing with one or two beams, single sweep operation, and plotting frequency of 100 kHz. It is a differential type, permitting the pick-up of small signals in the presence of large interfering signals, which would have swamped small signals in previous non-differential types. It uses a sweep generation system, permitting very superior registering of infrequent pulses or widely spaced signals. This oscilloscope has an operating range of 210-280 volts and 50-60 cycles.
Tektronix replaced the metal casing of this unit with perspex to reveal its electrical components.
'Serial 104092' inscribed on front, upper left corner. Manufacturer and logo inscribed on front, lower right corner.