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ASTM E 1458 Document Information:
Title
Standard Test Method for Calibration Verification of Laser Diffraction Particle Sizing Instruments Using Photomask Reticles
ASTM International
Publication Date:
May 20, 1992
Scope:
1. Scope
1.1 This test method describes a procedure necessary to permit a user
to easily verify that a laser diffraction particle sizing instrument
is operating within tolerance limit specifications, for example, such
that the instrument accuracy is as stated by the manufacturer. The
recommended calibration verification method provides a decisive
indication of the overall performance of the instrument at the
calibration point or points, but it is specifically not to be inferred
that all factors in instrument performance are verified. In effect,
use of this test method will verify the instrument performance for
applications involving spherical particles of known refractive index
where the near-forward light scattering properties are accurately
modeled by the instrument data processing and data reduction software.
The precision and bias limits presented herein are, therefore,
estimates of the instrument performance under ideal conditions.
Nonideal factors that could be present in actual applications and that
could significantly increase the bias errors of laser diffraction
instruments include vignetting (that is, where light scattered at
large angles by particles far away from the receiving lens does not
pass through the receiving lens and therefore does not reach the
detector plane), the presence of nonspherical particles, the presence
of particles of unknown refractive index, and multiple scattering.
1.2 This test method shall be used as a significant test of the
instrument performance. While the procedure is not designed for
extensive calibration adjustment of an instrument, it shall be used to
verify quantitative performance on an ongoing basis, to compare one
instrument performance with that of another, and to provide error
limits for instruments tested.
1.3 This test method provides an indirect measurement of some of the
important parameters controlling the results in particle sizing by
laser diffraction. A determination of all parameters affecting
instrument performance would come under a calibration adjustment
procedure.
1.4 This test method shall be performed on a periodic and regular
basis, the frequency of which depends on the physical environment in
which the instrumentation is used. Thus, units handled roughly or used
under adverse conditions (for example, exposed to dust, chemical
vapors, vibration, or combinations thereof) shall undergo a
calibration verification more frequently than those not exposed to
such conditions. This procedure shall be performed after any
significant repairs are made on an instrument, such as those involving
the optics, detector, or electronics.
1.5 The values stated in SI units are to be regarded as the standard.
1.6 This standard does not purport to address all of the safety
problems, if any, associated with its use. It is the responsibility of
the user of this standard to establish appropriate safety and health
practices and determine the applicability of regulatory limitations
prior to use.
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