Test method for photometric characteristics of retroreflectors
1 Scope
This standard specifies the apparatus, samples, test methods and calculation methods used in the photometric performance test of retroreflectors.
This standard is applicable to the test for photometric performance of retroreflectors.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
JT/T 688 Retroreflection vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 688 and the following apply.
3.1
circular aperture
diameter of circular hole surface with maximum field angle
3.2
source aperture
field angle size from the retroreflector center to exit diaphragm or pupil of light source. See Figure 1
Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Test apparatus 5 Sample 6 Testing method 7 Calculation
JT/T 690-2007, JT 690-2007, JTT 690-2007, JT/T690-2007, JT/T 690, JT/T690, JT690-2007, JT 690, JT690, JTT690-2007, JTT 690, JTT690
Introduction of JT/T 690-2007
Test method for photometric characteristics of retroreflectors
1 Scope
This standard specifies the apparatus, samples, test methods and calculation methods used in the photometric performance test of retroreflectors.
This standard is applicable to the test for photometric performance of retroreflectors.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
JT/T 688 Retroreflection vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 688 and the following apply.
3.1
circular aperture
diameter of circular hole surface with maximum field angle
3.2
source aperture
field angle size from the retroreflector center to exit diaphragm or pupil of light source. See Figure 1
Contents of JT/T 690-2007
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Test apparatus
5 Sample
6 Testing method
7 Calculation
