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

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DSH 656 ' \; E* k( |  \7 c4 M5 s7 W , }1 p2 T2 n5 X3 Y

Equivalent measurement setup for the Condition 1 for certain laser beams # H. e2 q5 N$ d

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)

Standard(s):
5 \/ X2 ?* ]4 x' X- L( GIEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
Sub clause(s):
9 Z* J* p% Y* Z+ N/ }9 Z) _Clause 9.1 Tests
9 l% J1 {9 i9 [6 b  p: d8 BClause 9.2 Measurement of laser radiation
% ^  n% r  i' V# }3 d+ ^Clause 9.3 Measurement geometry
2 x* X3 L/ G! A: y5 E3 j& H1 n1 Q+ qDecision Sheet n°: DSH 656
Subject: Equivalent measurement setup for the Condition 1 for certain laser beams
Key words:
- Condition 1
$ G/ J$ N, [8 a, z& d, g- Telescoping viewing
- Aperture stop
Approved by the 45th CTL Plenary meeting 2008
! c: ^9 R2 F; S! T9 a0 BQuestion:
0 [! o9 N; w: ZIs it necessary to always use a 50 mm aperture stop in order to fulfil the requirements for the measuring Condition 1?
Decision:
If 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.