DSH 656 Equivalent measurement setup for the Condition 1 for certain laser beams

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DSH 656 7 m% E' S/ H0 S9 D3 h

Equivalent measurement setup for the Condition 1 for certain laser beams

Clause 9.1 Tests Clause 9.2 Measurement of laser radiation Clause 9.3 Measurement geometry

60825-1(ed.1);am1;am2 & 60825-1(ed.2) " ]4 \6 N2 g  K% s2 j' _5 P6 `# d

+ a$ g- o# Q  n+ |Standard(s):
IEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
Sub clause(s):
8 x6 V' X2 I! c- l' HClause 9.1 Tests
8 E$ Z* x1 a  B/ [- g/ ~, h8 J  vClause 9.2 Measurement of laser radiation
Clause 9.3 Measurement geometry
Decision Sheet n°: DSH 656
Subject: Equivalent measurement setup for the Condition 1 for certain laser beams
Key words:
- Condition 1
- Telescoping viewing
- Aperture stop
Approved by the 45th CTL Plenary meeting 2008
Question:
- u  Z, i; F1 i- E0 Y$ [5 [Is it necessary to always use a 50 mm aperture stop in order to fulfil the requirements for the measuring Condition 1?
Decision:
5 e: w) w- C) m, YIf the laser beam is well collimated so that the entire radiant power is passing through a 7 mm aperture within 2000 mm distance, it is acceptable to use a 7 mm aperture stop for the purpose of testing according to Condition 1.
Note: National Certification Bodies shall provide objective evidence that the whole laser beam is captured with the reduced aperture size.

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