Cathode ray oscilloscope with a waveform storage capability

Details Cathode ray oscilloscope with a waveform storage capability Cathode ray oscilloscope with a waveform storage capability

1983-07-25

1985-09-17

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

315 9, 328124, G01R 1320, H01J 2950

Patent

active

045423393

ABSTRACT:
A CRO comprising a scan converter storage tube for storing the input waveform, and a CRT for displaying the input waveform received either directly from the signal input of the instrument or via the storage tube. As the center-to-center distance between the vertical and horizontal deflection plates of the storage tube unavoidably differs from the center-to-center distance between the vertical and horizontal deflection plates of the CRT, the input waveform is displayed in horizontally different positions on the CRT screen depending upon whether it is fed directly from the signal input or has been stored in the storage tube. In order to minimize this horizontal positional difference a position corrector circuit is provided which puts out a correction signal in proportion with a horizontal sweep speed determined by a sweep speed selector switch built into a sweep generator in a horizontal deflection circuit. In a preferred embodiment the correction signal is added to the sawtooth sweep signal put out by the sweep generator when the input waveform is being written on the storage tube. Additional embodiments are disclosed.

REFERENCES:
patent: 3337766 (1967-08-01), Malaby

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