Patent ID: 7184901

Claim:
A digitizing electrical measurement system, comprising: a microcomputer; a programmable sinusoidal signal generator for generating analog sinusoidal test signal; a voltage follower or buffer; a serial three terminals network comprised of a first reference resistor and a two open terminals which is coupled to a DUT (device under test ), wherein said serial three terminals network has a first node coupled to said programmable sinusoidal signal generator, a second node coupled to a first node of said voltage follower or buffer and a third node coupled to signal ground; and an analog-to-digital conversion having a first node coupled to said first node of said serial three terminals network, a second node coupled to a second node of said voltage follower or buffer, and a third node coupled to said microcomputer for delivering a first and a second digital sinusoidal signal to determine a physical quantity of said DUT (device under test) by said microcomputer based on said first, second digital sinusoidal signal and the resistance of said first reference resistor.