Classification of Photometer by Performance
A photometer can be defined as an instrument for measuring visible light. Luminance and illuminance meters are the most common photometers and are easily available as turnkey solutions. However, there are quite a number of photometers to choose from, ranging from hundred dollars to a few thousand dollars, all capable of performing similar measurement. If you are not familiar with the performance criteria of photometer you may feel pretty overwhelmed by the abundance of product information and specifications.
Hence, it is important that we recognize the classification of photometers by their performance according to international standard bodies, such as DIN and JIS.
Photometers are generally classified into different classes based on its performance by international standard bodies. The most commonly recognized international standards for photometer’s classification are Japanese Industrial Standards – (JIS) and Deutsches Institut für Normung e.V. – The German Institute for Standardization – (DIN). The respective standards governing the classification of illuminance meter for JIS and DIN are as follows:
JIS C 1609-1: 2006 “Illuminance Meters Part 1: General Measuring Instruments”
- Four classes (precision, class AA, class A and class B) are prescribed under this standard
- Nine performance criteria are specified to ensure the required performance according to each classification as shown in Table-1.
DIN 5032 Part 7 “Classification of Illuminance and Luminance Measuring Equipment”
- Four classes (class L, class A, class B and class C) are prescribed under this standard
- Fifteen performance criteria are specified to ensure the required performance according to each classification as shown in Table-1.
Table (1) – Performance Criteria for JIS and DIN Standards’ Classification
The following table (Table-2) shows the comparison between the two standards in term of its classification.
Table (2) – Comparison between JIS and DIN Classification
Konica Minolta Illuminance Spectrophotometer CL-500A conforms to the illuminance meter requirements for General Class AA of JIS C 1609-1: 2006 and Class B of DIN 5032 Part 7. It is the world’s first compact, lightweight, display-equipped illuminance spectrophotometer to meet both JIS and DIN standards (as of January 2012). Please click here for more information on CL-500A.
Mervin Woo is currently the Sales Manager for Konica Minolta Sensing Singapore Pte Ltd. Mervin graduated from The Royal Melbourne Institute of Technology (RMIT University) and joined Konica Minolta (previously known as Minolta Singapore Pte Ltd) in 1996. With over 17 years’ experience in the field of light and colour instrumentation industry, Mervin has been invited to give talks in several conferences and seminars on light and colour management, jointly organised by various industry associations, such as Society of Information Display (Singapore and Malaysia Chapter), and International Commission on Illumination (CIE), Malaysia. He has also written an educational handbook, The Language of Light, which explains basic concepts in photometry and colorimetry. This handbook also gives an overview on photometric and colorimetric instrumentations and addresses important considerations on instrument’s selection.