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

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DSH 656 # E. w4 Q, Y- ]

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)

; }! F# Q9 H: ?: y) P* W; fStandard(s):
  m) _& `! H. H/ mIEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
Sub clause(s):
0 x# K2 |4 U" i& Q3 B7 RClause 9.1 Tests
Clause 9.2 Measurement of laser radiation
& v9 Y' S: m- d( b4 DClause 9.3 Measurement geometry
1 s' ^5 @8 q/ `9 {6 g7 KDecision Sheet n°: DSH 656
Subject: Equivalent measurement setup for the Condition 1 for certain laser beams
Key words:
: K5 Z6 h: d7 y+ n- Condition 1
, x3 v6 Q2 {0 P$ }# K# ]1 T- y7 G- Telescoping viewing
- Aperture stop
0 ^  l- a' h8 y7 }1 q( VApproved by the 45th CTL Plenary meeting 2008
Question:
Is it necessary to always use a 50 mm aperture stop in order to fulfil the requirements for the measuring Condition 1?
3 w" P" ]3 X; {& {% `1 mDecision:
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.
2 `5 k# x. _+ t% a: i( u2 HNote: National Certification Bodies shall provide objective evidence that the whole laser beam is captured with the reduced aperture size.
1 G, N; R$ P5 ^! H! y

2 |& o. j3 D+ D0 V6 U$ r; v