The nearly avalanche expansion of the information and communication technology (ICT) strongly influenced many domains of our lives. From the viewpoint of an academic teacher specialized in the area of instrumentation and measurement (I&M) these influences alter both measurement techniques and didactic process. Distance learning based on the Internet technology is becoming more and more popular. In this context remote virtual laboratories are very useful tools. Students can access virtual instruments via a computer network and carry out real experiments directly by using a standard Web browser. In the paper there is presented a proposal of a virtual laboratory structure. To the key elements of the proposed system architecture belong: the main server, the so called system manager and measurement server. The software is created for Microsoft Windows 2003 Server and Windows XP Professional. The system has a modular structure which can be scalable in a simple way