Automatic range selection circuit

Details Automatic range selection circuit Automatic range selection circuit

H - Electricity

03

F

324/66

H03F 99/00 (2009.01) G01R 15/09 (2006.01)

Patent

CA 1065408

AUTOMATIC RANGE SELECTION CIRCUIT ABSTRACT OF THE DISCLOSURE The automatic range selection circuit is particularly useful with a photomultiplier tube linear microphotometer and includes an amplifier, adjustable and switchable impedances coupled between an input and an output of the amplifier for adjusting the gain thereof, two comparators for comparing the output from the amplifier with upper and lower reference voltage levels, an integrator for integrating the output of the comparators, and an analog control circuit responsive to the output signal level at the output of the integrator for controlling the amount of impedance coupled between the input and output of the amplifier thereby to automatically adjust the gain thereof. -1-

273463

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