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

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DSH 656 ; y$ q( Z, T8 N: J' }: M

Equivalent measurement setup for the Condition 1 for certain laser beams % g; a* s2 B" ^7 c. o5 J) x: i9 R

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) & v7 w, `( a+ A! S

. }( F4 b' u2 L- ~. J( k# r: O" IStandard(s):
, G; R9 N- u7 nIEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
Sub clause(s):
  P, l5 I$ s/ q7 j) q3 u" N5 sClause 9.1 Tests
Clause 9.2 Measurement of laser radiation
- x9 @  H/ p9 D7 ]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
+ M1 U! X, ^2 U9 Q# v& X! ?Approved by the 45th CTL Plenary meeting 2008
0 i1 H7 W- x3 i6 ~6 @- mQuestion:
5 T5 _3 r* x8 y0 t0 IIs it necessary to always use a 50 mm aperture stop in order to fulfil the requirements for the measuring Condition 1?
6 I+ |. k9 a' R4 ]: B% \# QDecision:
% l+ y, h, a2 J  \9 N1 dIf 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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