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

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DSH 656 0 E+ r; I! ?+ P7 c

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 5 P2 {' s8 _' P8 J" a& z" T& `# K

60825-1(ed.1);am1;am2 & 60825-1(ed.2)

0 g9 T0 r! z$ z( c! A$ m. jStandard(s):
IEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
Sub clause(s):
. U) j( I( N& I' s) FClause 9.1 Tests
Clause 9.2 Measurement of laser radiation
! v8 Q* I' a# P0 o" iClause 9.3 Measurement geometry
8 y% c+ i# p2 [& D1 @Decision Sheet n°: DSH 656
Subject: Equivalent measurement setup for the Condition 1 for certain laser beams
Key words:
3 t7 k/ v9 M; E7 @- z# g* n- Condition 1
5 A- j, X* h+ s" d  G3 l- Telescoping viewing
- Aperture stop
8 O+ `* P0 n" X. M& \3 ~Approved by the 45th CTL Plenary meeting 2008
( l' z- {( y( e. {Question:
Is it necessary to always use a 50 mm aperture stop in order to fulfil the requirements for the measuring Condition 1?
. P5 O# w& r2 X+ B8 S6 E7 O+ IDecision:
6 y- S9 K) T- D* A5 U- |' `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.
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