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BS 7920:2005

BS 7920:2005

$102.76

Luminance meters. Requirements and test methods

Published By Publication Date Number of Pages
BSI 2005 20
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This British Standard specifies performance requirements for luminance meters for the measurement of photopic luminance for applications other than the measurement of luminaires. It specifies the performance requirements for two types of luminance meter, Type L (laboratory instruments) and Type F (field instruments). This standard is intended for use by meter manufacturers and users.

NOTE The requirements specified for a Type L meter in this standard are identical to the requirements specified for a luminance meter in BS EN 13032-1. However, BS EN 13032-1 specifies additional requirements which are not specified in this standard.

PDF Catalog

PDF Pages PDF Title
1 BRITISH STANDARD
2 Committees responsible for this British�Standard
3 Contents
5 Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 luminance
6 3.2 luminance meter
3.3 photoelectric detector
3.4 selective or coloured filter
3.5 colour temperature
3.6 photometer head
3.7 measurement field
3.8 measurement field angle
3.9 effective range
3.10 field of view
3.11 fifty percent, ten percent and one percent measurement angles, of a photometer head
7 Figure 1 Diagram showing characteristic ray paths in a luminance meter
4 Classification
5 Digital ranges and readouts
8 6 Analogue scales
7 Calibration and testing temperature
8 Power supply
9 Performance requirements for laboratory and field luminance meters
Table 1 Test and calibration methods
9 Table 2 Error tolerances for luminance meters
10 Marking
10 Annex A (informative) Guidance on choice of meter range
A.1 General
A.2 Choice of range
Annex B (normative) Calibration
A.1 General
B.2 Calibration methods
B.2.1 Calibration using a reference luminance source
B.2.2 Calibration using a reference meter
11 Annex C (normative) Test methods
C.1 Test for linearity
C.1.1 Principle
C.1.2 Apparatus
C.1.3 Procedure
12 C.1.4 Calculation of non-linearity
C.2 Calculation of spectral correction error
C.3 Infra-red response test
C.3.1 Apparatus
C.3.2 Procedure
13 C.3.3 Expression of results
C.4 Ultraviolet response test
C.4.1 Apparatus
C.4.2 Procedure
C.4.3 Expression of results
C.5 Directional response test
C.5.1 General
C.5.2 Procedure for measurement of directional response
14 C.5.3 Calculation
Figure C.1 Co-ordinates for calculation of the directional response function
15 C.6 Surrounding field luminance (veiling glare) test
C.6.1 Apparatus
Figure C.2 Diagram showing gloss traps for determining surrounding field error
C.6.2 Procedure
C.6.3 Expression of results
C.7 Test for fatigue
16 C.8 Focus error test
C.8.1 General
C.8.2 Apparatus
C.8.3 Procedure
C.8.4 Calculation
C.9 Test for error due to temperature change
C.10 Test for error due to range change
C.11 Calculation of spectral correction factors
C.11.1 Principle
17 C.11.2 Calculation
C.11.3 Example of calculation of correction factor for high pressure sodium lamp
18 Table C.1 Example of calculation of correction factor for a high pressure sodium lamp

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BS 7920:2005
$102.76