DIGITAL CONVERTERS METROLOGICAL SPECIFICATION FOR RESISTANT THERMAL THERMOSENSORS COMPARE

In this paper presents comparative metrological analysis of two options for connecting Pt100 resistive temperature sensors to high-precision analog-to-digital converters is carried out: a proportional circuit in which the reference resistor serves to form the reference voltage, and a canonical 4-wire circuit where the resistance of the reference resistor is measured in the same way as the resistance of the temperature sensor are presented. It is shown that the error of the one-stroke proportional circuit is determined by the long-term instability of the gain, while the resulting error of the push-pull canonical circuit is determined by the short-term instability of several elements. The insignificant advantage of the canonical circuit with the accuracy of conversion and in the absence of additional requirements for the input of the reference voltage is affirmed, which gives recommendations for the practical application of the circuits considered in meters of temperature. References 10, figures 2, table 1.

DISEMINASI RESISTOR STANDAR 1 KΩ KE STANDAR KERJA

<p>Abstrak<br />Diseminasi nilai kalibrasi resistor standar kepada standar kerja di Puslit Metrologi - LIPI telah dilakukan. Hal ini bertujuan untuk mendapatkan hasil kalibrasi dan estimasi ketidakpastiannya yang valid dan tertelusur ke SI pada standar kerja. Desiminasi dilakukan dengan cara mengimplenmentasikan nilai kalibrasi resistor standar 1 kΩ ke resistor acuan dan kemudian ke standar kerja. Nilai yang telah diturunkan kepada standar kerja, reference multimeter, telah dibandingkan dengan nilai pengukuran yang dilakukan oleh KRISS (Korea Research Institute of Standards and Science) melalui kriteria derajat ekuivalensi. Error number berdasarkan kriteria derajat ekuivalensi antara Metrologi - LIPI dan KRISS pada resistor-resistor 100Ω, 10Ω, dan 1Ω masing-masing adalah sebesar 0,51, 0,73, dan 0,87. Berdasarkan error number tersebut, hasil pengukuran Metrologi - LIPI memiliki kesesuaian nilai ukur dengan hasil ukur KRISS. Lebih daripada itu, hal tersebut telah memvalidasi hasil kalibrasi dan estimasi ketidakpastian dari resistor acuan dan standar kerja di Puslit Metrologi - LIPI.<br />Kata kunci: nilai kalibrasi, resistor standar, standar kerja, kriteria derajat kebebasan, validasi.</p><p><br />Abstract<br />Dissemination of calibration value of standard resistor to working standard in Research Center for Metrology LIPI has been done. It aims to get the calibration result and the uncertainty estimation that are valid and traceable to SI on the working standard. The desimination was performed by implementing calibration value of 1 kΩ standard resistor to reference resistor and then to working standard. The value that had been disseminated to working standard, reference multimeter, had been compared to the measurement value made by KRISS (Korea Research Institute of Standards and Science) through a degree of equivalence criteria. The error numbers based on the degree of equivalence criteria between Metrology-LIPI and KRISS for the resistors measurement of 100Ω, 10Ω, and 1Ω were 0.51, 0.73, and 0.87 respectively. Based on those error numbers, Metrology-LIPI measurement results had the measuring value agreement with KRISS measurement results. Moreover, Its had validated calibration result and the uncertainty estimation of reference resistor and working standard in Metrology LIPI<br />Keywords: calibration value, standard resistor, working standard, degree of equivalence criteria, validation.</p>

Novel Temperature Sensor Fabricated with Oxide and Metal

Resistance of metal depends on temperature. Therefore, the metal can be used as a temperature sensor with a reference resistor. The reference resistor is connected serially and the voltages of the sensor metal are measured after applying DC voltage. However, it is not easy to keep the reference resistance constant while measuring temperatures. We studied the temperature dependence of resistance of oxide material to apply it to the bridge type temperature sensor which is insensitive to the environmental temperature. We made bridge type temperature sensor with oxide material and metal. The novel temperature sensor does not need a reference resistor, and composed of oxide and metal. Therefore, we could remove error induced by environmental temperature variation. Moreover, the novel bridge type temperature sensor provides higher sensitivity than conventional sensor structure. By different thermal coefficient of the oxide material, it was possible to remove an external reference resistance. The proposed bridge type temperature sensor is a self-reference temperature sensor which is insensitive to the environmental temperature.