Nina Mae Dela Cruz, Agnes de Asis, Sean Estrada, Rosa Ella Felipe, Nerissa Aguilar, Marlon Aguinaldo
Proficiency testing (PT) results from PT schemes in Salmonella sp. detection in octopus powder (ICSM-2022-01), and in shrimp powder (ICSM-2023-01) were described. Participants’ performance was assessed based on accurate determination of presence or absence of the target organism. Reported results from all 29 participants in ICSM-2022-01 achieved 93.10% sensitivity and 86.21% specificity. Out of 29 laboratories, 23 received satisfactory evaluation while six received unsatisfactory evaluation. In ICSM-2023-01, reported results from all 28 participants obtained 96.43% sensitivity and 78.57%...
IMEKO TC8, TC11 and TC24 Conference
· TC24
· 2025
· 10.21014/tc24-2025.027
· Download
Giorgio Brida, Marco Terzi, Mauro Rajteri
Many medical measuring devices (MMD), such as those used in clinical diagnostics, use optical absorbance as the measurand. Optical absorbance in MMDs is usually measured in microvolumes, according to pharmaceutical quality standards; some instruments should also be calibrated for absorbance at required specific wavelengths due to their construction. Optical absorbance liquid filters (OALF) are used to calibrate optical absorbance measurement equipment, but there is currently a capability gap across NMIs in the characterization and use of such filters, which leads to a lack of traceability....
IMEKO TC8, TC11 and TC24 Conference
· TC8
· 2025
· 10.21014/tc8-2025.026
· Download
Maja Grbic
The paper is related to measurements of power frequency (50 Hz) electric and magnetic fields. The measurements are carried out in order to check the compliance of the field levels with the reference levels prescribed by national and international legislation. For the purpose of the conformity assessment, it is necessary to evaluate the expanded measurement uncertainty for each particular case and to adopt the decision rule. It is analyzed how the expanded measurement uncertainty and the adopted decision rule affect the conformity assessment. The analysis is carried out on a set of several...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.025
· Download
Maja Grbic, Aleksandar Pavlović
Measurements of electromagnetic fields in the vicinity of overhead power lines are carried out in order to assess the exposure of the general public to these fields and to check whether the field levels are within the prescribed limits. Since the measurement results are compared with the prescribed reference levels, the measurement uncertainty should be evaluated and taken into account in the conformity assessment. The paper analyzes the most relevant uncertainty components related to measurements of electric and magnetic fields near overhead power lines. The uncertainty components related...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.024
· Download
Emanuel Paquete Correia
The world is filled with 3d printers and materials, allowing people to fulfil the fruits of their creative minds. However, certain projects require the production of objects within tight tolerances, and this can be a challenge for the majority of 3d printers. This paper aims to present a study on the dimensional accuracy and precision of a Qidi Tech X-Max 3d printer, by manufacture of three perforated plastic plates, equivalent to test sieve perforated metal plates, and measurement of these parts on an optical CMM, using a VBA program for calibration according to ISO 3310. This procedure...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.023
· Download
Marija Cundeva-Blajer, Gjorgji Dimitrovski, Monika Nakova, Kiril Demerdziev
The calibration of high frequency instruments, like oscilloscopes or frequency counters, is a metrologically very intensive task, due to: complex measurement procedures, unattested SI measurement traceability chain for high frequencies signals, and numerous uncertainty contributions. These calibrations are to some extent prescribed in the Euramet cg-7 Guideline. The uncertainty models for calibration of oscilloscopes, introduced by the Laboratory for Electrical Measurements at the Ss. Cyril and Methodius University in Skopje are presented. An original software developed in LabVIEWTM,...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.022
· Download
Marija Cundeva-Blajer, Monika Nakova, Kiril Demerdziev
The development of a calibration procedure for impedance parameters meters in the Laboratory for Electrical Measurements at the Ss. Cyril and Methodius University in Skopje is presented. The procedure encompasses evaluation of the measurement uncertainty in calibration of meters for electrical inductance and capacitance by two approaches: the mainstream GUM methodology and the stochastic Monte Carlo technique. For the Monte Carlo evaluation, an original universal software MonteCalc Uncertainty Toolkit is developed in LabVIEWTM. The Toolkit is applied on real experimental data derived from...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.021
· Download
Jelena Jankovic, Valentina Vasovic, Draginja Mihajlovic, Neda Kovacevic, Dejan Kolarski
The application of analytical methods in power transformer (PT) condition assessment enables the separation, identification and quantification of degradation products or contaminants, which are present in mineral transformer oils in low concentrations (mg/kg, μg/kg). This paper presents a review of the key instrumental methods applied in the laboratory of the Nikola Tesla Institute (NTI) and emphasizes the importance of their application during transformers life cycle. Gas chromatography (GC) is applied for assessment of PT operating condition and fault detection, cellulose degradation and...
IMEKO TC8, TC11 and TC24 Conference
· TC24
· 2025
· 10.21014/tc24-2025.020
· Download
Dragana Naumovic-Vukovic, Nevena Malesevic, Savo Marinkovic
The calibration laboratories accredited according to the standard ISO/IEC 17025:2017 should continuously monitor the validity of measurement results. By ensuring the validity of calibration results, the laboratory also monitors its own performance. There are several different techniques for confirming the validity of results and they are a matter of choice and capability of the accredited laboratory. The paper describes two different methods that the Laboratory for testing and calibration of the Nikola Tesla Institute of Electrical Engineering uses in intra-laboratory comparison as a...
IMEKO TC8, TC11 and TC24 Conference
· TC8
· 2025
· 10.21014/tc8-2025.019
· Download
Kiril Demerdziev, Marija Cundeva-Blajer
Adherence to ISO/IEC 17025:2017 requires inter-laboratory comparisons and proficiency testing, alongside other measures, for ensuring test and calibration data validity. This study explores intra-laboratory comparison, as an additional quality assurance method. The presented procedure is conducted in an accredited calibration laboratory, by comparing results sourced/measured with multiple reference standards, including a high-voltage decade resistor, 8 ½ and 6 ½ digit multimeters, and a multifunction calibrator with a high-resistance measurement adapter, all of them covering the range of...
IMEKO TC8, TC11 and TC24 Conference
· TC11
· 2025
· 10.21014/tc11-2025.018
· Download