Patent ID: 6866639

Claim:
A sub-microvolt electrical signal testing device, comprising: a portable hand-held enclosure; a processor housed by said enclosure; a memory operatively coupled to said processor, said memory storing one or more operating instructions; a display device mounted to said enclosure, said display device being operatively connected to said processor; a multi-channel input-output interface operatively coupled to said processor with a bi-directional communications channel, said multi-channel input-output interface configured with at least one input channel to receive external electrical signals and communicate said external electrical signals to said processor; a plurality of electrical shock protection components coupled between said at least one input channel and said bi-directional communications channel; a switching network coupled between each of said plurality of electrical shock protection components and said bi-directional communications channel, said switching network configured to selectively couple one of a plurality of electrodes to said bi-directional communications channel; a differential operational amplifier coupled between said switching network and said bi-directional communications channel, said differential operational amplifier having an adjustable gain setting; and wherein said processor is configured to utilize said one or more operating instructions to perform one or more tests on signals received from said multi-channel input-output interface, and to display results of said one or more tests on said display device.