Field Comparison of Illuminance Meters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F22%3A00360932" target="_blank" >RIV/68407700:21230/22:00360932 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/10467/107976" target="_blank" >http://hdl.handle.net/10467/107976</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Field Comparison of Illuminance Meters

Popis výsledku v původním jazyce

Illuminance meters used for measuring illuminance related to health protection, environmental protection or safety at work are legally controlled measuring instrument in Czech Republic and are subject to Decree of the Ministry of Industry and Trade No. 345/2002 Coll., item 5.1.2 which specifies measuring instruments for mandatory verification and measuring instruments subject to type approval. In the Czech Republic, the legislation defines a period, specified only for legally controlled measuring instrument, that have been type-tested. In the field of illuminance measurement, only a few types of illuminance meters on the market have this type verification. The period of validity of the verification is set by the Decree at 2 years for illuminance meters. The verification legally controlled measuring instrument is carried out by state or authorized testing institutes. Verification by an authorized metrology center confirms that the legally controlled measuring instrument has the required metrological characteristics in accordance with the procedure laid down by the Ministerial Decree, that the selected decisive parameters correspond to the values indicated by the manufacturer and that they meet the requirements of a measure of a general nature issued by the Czech Metrology Institute. For legally controlled measuring instrument, when they are introduced on the market, a type test is required, which is the verification of all the parameters of the instrument according to the type sheets. Only some important parameters are then checked during the actual verification. The legally controlled measuring instrument is marked with an official mark by the authorized metrology center and subsequently receives a verification certificate in accordance with the Ministerial Decree. Where illuminance meters are used in situations where the use of legally controlled measuring instrument is not required, calibration is used for their checking, which is also carried out by an authorized center, such as the Czech Metrology Institute. Calibration does not have a set time interval within the legislation when it is carried out. The calibration period is set by the measuring organizations in their own internal regulations. The voluntary national technical standard specifies a maximum interval between calibrations for field measurement illuminance meters of 3 years. During calibration, the response of the measuring instrument being monitored is determined for a specific standard. The result is a calibration curve from which the 'correct' value relative to a particular standard can be determined. It is clear from the above description that both verification and calibration can be quite time-consuming matters and, due to the financial cost of the test, are normally only undertaken when necessary. Furthermore, it is common for sites to also own indicating instruments without verification or proper calibration. However, even with these devices, it is necessary to verify, at least in a rudimentary way, the correctness of the quantities indicated. Not every workplace is equipped, for example, with a photometric bench where the instruments can be compared and any deviations in the measured values can be determined. This paper describes the design of an instrument used for comparison of illuminance meters, or field verification of the correct functionality of the illuminance meter, correctness of the displayed measurement results and, if necessary, determination of a simplified correction factor of illuminance values for individual illuminance meters. The device is used to ensure that the same amount of light falls on the two detector of the illuminance meters. The measured values are then read from the illuminance meters and the difference is used to determine a simplified correction factor for the illuminance value.

Název v anglickém jazyce

Field Comparison of Illuminance Meters

Popis výsledku anglicky

Illuminance meters used for measuring illuminance related to health protection, environmental protection or safety at work are legally controlled measuring instrument in Czech Republic and are subject to Decree of the Ministry of Industry and Trade No. 345/2002 Coll., item 5.1.2 which specifies measuring instruments for mandatory verification and measuring instruments subject to type approval. In the Czech Republic, the legislation defines a period, specified only for legally controlled measuring instrument, that have been type-tested. In the field of illuminance measurement, only a few types of illuminance meters on the market have this type verification. The period of validity of the verification is set by the Decree at 2 years for illuminance meters. The verification legally controlled measuring instrument is carried out by state or authorized testing institutes. Verification by an authorized metrology center confirms that the legally controlled measuring instrument has the required metrological characteristics in accordance with the procedure laid down by the Ministerial Decree, that the selected decisive parameters correspond to the values indicated by the manufacturer and that they meet the requirements of a measure of a general nature issued by the Czech Metrology Institute. For legally controlled measuring instrument, when they are introduced on the market, a type test is required, which is the verification of all the parameters of the instrument according to the type sheets. Only some important parameters are then checked during the actual verification. The legally controlled measuring instrument is marked with an official mark by the authorized metrology center and subsequently receives a verification certificate in accordance with the Ministerial Decree. Where illuminance meters are used in situations where the use of legally controlled measuring instrument is not required, calibration is used for their checking, which is also carried out by an authorized center, such as the Czech Metrology Institute. Calibration does not have a set time interval within the legislation when it is carried out. The calibration period is set by the measuring organizations in their own internal regulations. The voluntary national technical standard specifies a maximum interval between calibrations for field measurement illuminance meters of 3 years. During calibration, the response of the measuring instrument being monitored is determined for a specific standard. The result is a calibration curve from which the 'correct' value relative to a particular standard can be determined. It is clear from the above description that both verification and calibration can be quite time-consuming matters and, due to the financial cost of the test, are normally only undertaken when necessary. Furthermore, it is common for sites to also own indicating instruments without verification or proper calibration. However, even with these devices, it is necessary to verify, at least in a rudimentary way, the correctness of the quantities indicated. Not every workplace is equipped, for example, with a photometric bench where the instruments can be compared and any deviations in the measured values can be determined. This paper describes the design of an instrument used for comparison of illuminance meters, or field verification of the correct functionality of the illuminance meter, correctness of the displayed measurement results and, if necessary, determination of a simplified correction factor of illuminance values for individual illuminance meters. The device is used to ensure that the same amount of light falls on the two detector of the illuminance meters. The measured values are then read from the illuminance meters and the difference is used to determine a simplified correction factor for the illuminance value.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

PROCEEDINGS 14th European Lighting Conference LUX EUROPA 2022

ISBN

978-80-11-02269-3

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

355-359

Název nakladatele

Česká společnost pro osvětlování

Místo vydání

Ostrava

Místo konání akce

Praha

Datum konání akce

20. 9. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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