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

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DSH 656 , o* C/ F; R) U, L2 Q( L 1 ~# O7 e+ X! C2 E) q, n

Equivalent measurement setup for the Condition 1 for certain laser beams + `! S( p; Y9 U: d. r4 U/ h

Clause 9.1 Tests Clause 9.2 Measurement of laser radiation Clause 9.3 Measurement geometry   o- b' T$ C# z

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

Standard(s):
IEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
Sub clause(s):
Clause 9.1 Tests
Clause 9.2 Measurement of laser radiation
2 V/ _/ B* z' L' l+ r7 CClause 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
- }$ b" k3 F/ ]/ R5 B7 t- Telescoping viewing
( r8 h! }7 Z& {" N; S0 l- M7 i- Aperture stop
& x* D- D" w9 m! [! t9 zApproved 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?
6 x4 R0 B  E0 M1 w, lDecision:
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.
. o3 C" J) ?6 U5 N6 G2 HNote: National Certification Bodies shall provide objective evidence that the whole laser beam is captured with the reduced aperture size.
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