Method and apparatus for combining an optical and electrical cha

Details Method and apparatus for combining an optical and electrical cha Method and apparatus for combining an optical and electrical cha

1988-10-27

1989-08-22

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

324115, 333 81R, G01R 3500, H03H 724

Patent

active

048599352

ABSTRACT:
A combined electrical and optical channel for use in an oscilloscope is provided in which the vertical deflection factor is set by a single input attenutation selector switch. The electical input is passed through an attenuator. The optical input is passed through an input transimpedance amplifier having at least two gain modes and an attenuator. The output from the input attenuation selector switch is encoded to form a digital output. The attenuators for the electrical channel are driven directly by the input attenuation selector switch or by the digital output corresponding to the setting of the input attenuation selector switch. The digital output is also decoded by a logic block to generate a gain mode logic signal to switch the gain modes of the input transimpedance amplifier. In addition, the logic block generates a logic signal to select an appropriate attenuation factor for the optical channel according to the setting of the input attenuation selector switch and the gain mode of the input transimpedance amplifier. The attenuated voltage output of each channel is selectively switched and passed to a common vertical amplifier section in the oscilloscope.

REFERENCES:
patent: 4553091 (1985-11-01), Bristol
patent: 4654610 (1987-03-01), DaSilva
patent: 4806888 (1989-02-01), Savage et al.

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