Anritsu MT9812B, Operation Manual, Page: 6 / 144

For Safety
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Class 1, 1M indicate the danger degree of the laser radiation specified
below according to IEC 60825-1:2001.
Class 1: Lasers that are safe under reasonably foreseeable conditions
of operation, including the use of optical instruments for
intrabeam viewing.
Class 1M: Lasers emitting in the wavelength range from 302.5 to 4000
nm that are safe under reasonably foreseeable conditions of
operation, but may be hazardous if the user employs optics
within the beam. Two conditions apply:
a) for diverging beams, if the user views the laser output with
certain optical instruments (for example, eye loupes,
magnifiers and microscopes) within a distance of 100 mm;
or
b) for collimated beams, if the user views the laser output with
certain optical instruments (for example, telescopes and
binoculars).
Class I, IIa, II, IIIa, IIIb indicate the degree of danger of the laser radiation
outlined below as defined by 21 CFR 1040.10:1995.
Class I: Class I levels of laser radiation are not considered to be
hazardous.
Class IIa: Class IIa levels of laser radiation are not considered to be
hazardous if viewed for any period of time less than or equal
to 1
×
10
3
seconds but are considered to be a chronic viewing
hazard for any period of time greater than 1
×
10
3
seconds.
The wavelength range of laser radiating is in 400 to 710 nm.
Class II: Class II levels of laser radiation are considered to be a chronic
viewing hazard. The wavelength range of laser radiating is
in 400 to 710 nm.
Class IIIa: Class IIIa levels of laser radiation are considered to be,
depending upon the irradiance, either an acute intrabeam
viewing hazard or chronic viewing hazard, and an acute
viewing hazard if viewed directly with optical instruments.
The wavelength range of laser radiating is in 400 to 710 nm.
Class IIIb: Class IIIb levels of laser radiation are considered to be an
acute hazard to skin and eyes from direct radiation.