CALIBRATION PROCEDURE AND UNCERTAINTY ANALYSIS OF AN ELECTRONIC SCALE BASED ON TWO-CURRENT SOURCE SUPPLIED CIRCUIT
Original scientific paper The article presents the prototype version of an original weight scale in which a non-conventional supplying circuit of strain gauge load cells is applied. The paper discusses construction of an electrical circuit, the way of strain gauge transducer connection and the measuring procedure. As far as the authors know, this novel electrical circuit and its application in a weight scale system have never been mentioned in literature. The specifications for directreading weight scales typically include readability, repeatability, linearity and eccentricity. The values of these parameters were estimated and used for calculation of the weight measurement uncertainty in the tested measuring range of the designed device.
Two-parameter measurement and signal conditioning in double-current supply four-terminal resistance circuits
A new type of the four-terminal (4T) bridge circuit unconventionally supplied by current sources connected in parallel to opposite arms, named double current bridge (2J) is presented. It has two different outputs from both diagonals. Three variants of such circuit are proposed. Their output voltages are given as functions of arm resistance increments in absolute and in relative units . Signal conditioning formulas of the two-parameter (2D) measurement of these increments and also of two external variables differently influencing them are discussed in detail. First results of instrumentation designed experimentally using 2J bridge circuits are shortly presented. A summary and prospective applications of 2J bridge circuits in multivariable measurements are given. Literature is included.
Educational innovation in Musical Language Course: responses and the overcoming of limitations
This article presents an innovative methodological proposal for the development of auditory education in the course of the Language of Music. Based on this proposal, we analyze an educational community’s response to the innovations implemented, and we identify the limitations recognized throughout the learning and teaching process, as well as the strategies developed to overcome them. To this end, we applied a qualitative methodology with the classroom-based research method. The compilation of data was carried out through participant observation, captured in the journals of the professor and researcher, interviews and analysis of documents. The research results demonstrate that patience, responsibility and perseverance in their work on behalf of the professors have been key to overcoming the limitations identified and in promoting that students enjoy and learn their class contents in meaningful ways. Recibido 05/02/2018 Aceptado: 09/03/2018