CROSS-PLATFORM VIRTUAL TWO-COORDINATE RECORDER BASED ON UT61E MULTIMETERS

Abstract

Scientific and technological progress is closely related to the development of means for measuring physical quantities (PQ). When conducting natural science research, digital multimeters and two-coordinate recorders (TCR) are often used.Digital multimeters have fairly high accuracy, low cost, and allow measuring various physical quantities in a wide range of their variation.Two-coordinate recorders record functional dependencies between PQ during various processes.Currently, two-coordinate recorders are created in the form of virtual devices that have hardware based on a data acquisition system and a computer program that controls the operation of the device and displays the measurement results.When operating virtual devices, it is important to ensure their functioning on different computer platforms.Development of cross-platform virtual TCR with the ability to measure various electrical quantities in a wide range of their variation is an urgent task. This problem can be solved by using digital multimeters as data collection systems, which have a COM or USB port for outputting measurement results to a connected computer.Cross-platform TCR on these devices can significantly expand the range of physical quantities that are measured, relative to existing two-coordinate recorders, without significantly deteriorating the accuracy of such measurements.Virtual cross-platform two-coordinate recorders based on multimeters have not been developed.Using the Java programming language, a cross-platform virtual two-coordinate recorder was created based on UT61E multimeters from Uni-Trend.The computer program of the device has a graphical user interface and allows the recorder to record, for each of the two coordinates (X and Y), a constant voltage within 0 ± 1000 V and a constant current within 0 ± 220 mA.In addition, it has the ability to save measurement results and access them if necessary.The functioning of the virtual recorder was tested when obtaining the volt-ampere characteristic of a zener diode, the transfer characteristic of a transistor by current in a circuit with a common emitter, and the dependence of the voltage on the transistor emitter on the voltage on the base in an emitter follower circuit.