INFLUENCE OF A MEASUREMENT UNCERTAINTY OF A COLD JUNCTION IN TESTING OF HEATING
Gaber Begeš, Valentin Batagelj, Igor Pušnik
Abstract:
Testing of safety of electrical appliances is very important for assuring of safety of users. One of the safety tests is testing of heating of appliances and their surrounding. The test is performed in a measurement system so called "black test corner", which is partially standardised. Measurement of heating is performed with thermocouples. This paper describes the analysis of the influence of the measurement uncertainty of a cold junction of a thermocouple in testing of heating. Heating of appliances is measured as a difference between the temperature of the appliance and the temperature of the surrounding. If the cold junction of a thermocouple is exposed to temperature of the surrounding the thermocouples measure the heating and not the absolute temperature. The measurement uncertainty and the temperature value of the cold junction must be known for proper measurement and uncertainty evaluation.
Keywords:
testing, cold junction, heating
Download:
PWC-2003-TC8-020.pdf
DOI:
-
Event details
Event name:
XVII IMEKO World Congress
Title:

Metrology in the 3rd Millennium

Place:
Dubrovnik, CROATIA
Time:
22 June 2003 - 28 June 2003
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