基于LabVIEW实现的隔离放大器非线性误差自动测试

An Auto-measurement for Isolation Amplifier based on LabVIEW

隔离放大器是一种输入电路和输出电路之间电气隔离的器件,一般采用变压器或光耦合传递信号,非线性误差是其一项重要的技术指标。本文介绍了一种基于LabVIEW实现的隔离放大器的自动测试技术,系统以标准信号源、数字多用表为标准装置,通过GPIB和TCPIP通信来实现计算机对隔离放大器的自动测试,完成非线性误差的计算,并自动生成测试报告。文中介绍了系统的测量原理、组成、非线性误差的算法以及软件编制。系统在实际的工作中取得了良好效果,显著提高了工作效率,为实验室检测工作的自动化作了有意尝试。

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 per- formance 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 nonlin- ear 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 at- tempt for testing job.