Automatic function selecting multimeter

Details Automatic function selecting multimeter Automatic function selecting multimeter

G - Physics

01

R

324/68, 324/71

G01R 19/25 (2006.01) G01R 15/09 (2006.01) G01R 15/12 (2006.01) G01R 17/02 (2006.01)

Patent

CA 2030938

Abstract of the Disclosure A digital multimeter having automatic function selection capability includes a signal type detector and an analog-to-digital converter formed as an application specific integrated circuit. The signal type detector has a comparator circuit that compares the analog input signal to be measured with predetermined thresholds and stores the resulting values, which are related to the type of analog input signal, in a memory that is also a part of the signal type detector. A controller executes an automatic function selection program that causes the controller to read the stored values and generate a corresponding function code, which causes an analog-to-digital converter to be configured to perform an appropriate conversion function on the analog input signal. When a change in the type of analog input signal is sensed, the controller aborts the present measurement cycle and proceeds with a next measurement cycle in which the changed analog input signal is measured. The controller also produces a changing alert signal to indicate that a change in signal type has occurred.

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