DESIGN OF A LOCK-IN AMPLIFIER MICRO-OHMMETER USING PROTEUS VSM

This paper presents the design of a lock-in amplifier micro-ohmmeter using Proteus VSM. To achieve a seamless complex design, it is usually better and easier to break the design task into stages and this paper used that approach in Proteus to achieve the task of designing the micro-ohmmeter. The paper introduced the concept of a micro-ohmmeter and its constituent segments. Each segment was analyzed at component level with appropriate mathematical equations. The result and implementation of each analysis was verified through simulation in Proteus. The paper makes a comparison between the theoretical operation of the circuit and the operational result obtained via the simulation. The comparison confirms that the design of the circuit using Proteus was successful due to the fact that the simulation results matched that of theory.