Abstract: Isolation amplifier has the function of electric isolation between input circuit and output circuit. It usually uses transformer or light coupling to transfer signal. Nonlinear error is an important performance of technology. In the paper, an automeasurement system for isolation amplifier is introduced that is based on LabVIEW. In this system signal source and digit multi-meter are used as the standard, and they are connected with a computer by GPIB or TCPIP cables. It completes the numeration of nonlinear error, and builds the report automatically. Then some details about the theory, composing, arithmetic and software is introduced. Now this system has been used in work effectively, which is rewarding attempt for testing job.

Key words: LabVIEW, Isolation amplifier, Nonlinear error, Auto-measurement