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ASTM F — ASTM A ASTM F ASTM B ASTM D Designation: E? A number in parentheses indicates the year of last reapproval. A superscript epsilon? Scope 1. The testing apparatus must be able to achieve the coplanar geometry. In this case the methods of Procedure B in Practice E apply. Additional information on the use of portable retrore? 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.

Referenced Documents 2. Terminology 3. An equivalent term used for coefficient of retrore? The term coefficient of retrore? RA may also be used to determine the minimum area of retrore? RA has been used extensively in the speci? Current edition approved Jan.

Published January Originally approved in Last previous edition approved in as E — 03 DOI: Since by de? The full range is de? The retrore? For retrore? The de? More generally, rotation angle is the angle from the positive part of second axis to the datum axis, measured counterclockwise from a viewpoint on the retrore?

Summary of Test Method 4. The specimen holder is separated from the light source by 15 m. This test method has been found useful for tests at observation angles between 0.

It has been used to determine coefficient of retrore? Apparatus 6. The projection lamp together with the projection optics shall be operated such that it illuminates the test specimen with this spectral power distribution. This corresponds to 0. This is commonly accomplished by placing a restrictive aperture in the projector slide port. Correction factors may be used to ensure a linear response.

Linearity veri? This corresponds to a 0. The size of the entrance aperture stop must be small so that the receiver may be positioned physically close to the source exit aperture without shadowing any of the illuminating light beam.

It must allow the observation angle to be varied see Fig. The usual range is at least 0. For most materials, a positioning accuracy of A common method of? Flat black paint, black curtains, black tape and other means shall be used to eliminate unwanted light.

Sampling 7. The average value of these three specimens will be reported. One method of meeting this requirement is to take three specimens—left, center, and right—diagonally across the roll. At least three 0. Test Specimen and Sample 8. Historically a mm square specimen 1 ft2 has been used but this large a specimen can be clumsy to handle and does not signi?

Specimens mm square have been successfully used with modern receiver systems. This can be accomplished by applying the sample to a? This may be done by marking an arrow on the back of the specimen pointing toward the center of one of the m sides. Calibration and Standardization 9. When the proper voltage or current has been established for this requirement, the values or setting shall be recorded and used during the measurement procedure see Annex A3 of Practice E Procedure Measure the actual distance to When making this measurement, the source exit aperture is to be centered in the?

Record the mean of the four readings as the initial incident illuminance, m2. Background light from directions other than the projector exit aperture must be negligible that is, less than 0. ASTM recommends that the test speci? With a black surface substituted for the test specimen, measure the background light level mb.

Make linearity corrections to this reading if required and record as m1. The rotation angle is changed by rotating the specimen about its own retrore?

The datum mark may be provided at the time of sampling or may be implied by the production process. In some cases the datum mark is indicated directly on the material at time of manufacture. See Section 7. The starting position is determined and indicated in Fig. It can be in any position as determined by the equipment con? A speci? With rotational uniformity, no datum mark is needed. See Section 13, which reports results of this test method.

This will result in a series of mb and m1 readings for the? Follow the same procedure for testing additional specimens. The average of the four initial readings when compared to the four? Average all eight readings, correct for linearity if required, and record as m2. Record this as A. Calculation These average values are to be reported, and used to determine conformance to speci? Report Precision and Bias There are three parameters which must be considered when analyzing the precision of a measurement of coefficient of retrore?

Each laboratory measured each material four times. These four measurements were made on at least two different days.

There are 14 different materials. Calculations were made for six different geometries. The values in Table 1 indicate the magnitude of coefficient of retrore? They are essentially averages. Table 3 contains the estimates of between laboratory precision. This table contains estimates of a combination of the within- and between-laboratory component of variance.

The reproducibilities of test results including both within- and between-laboratory variability are indicated by the coefficient of variation in Table 4. These values are given as percentages. Keywords Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.


ASTM E810 - 03(2013)



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Standard Test Method for. A number in parentheses indicates the year of last reapproval. The testing apparatus must be able to achieve the coplanar geometry. In this case the methods of Procedure B in Practice E apply.

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