ASTM E1256 PDF

A user without sufficient knowledge and experience should seek assistance from the equipment makers or other expert sources, such as those found at the National Institute of Standards and Technology in Gaithersburg, Maryland. About project SlidePlayer Terms of Service. You may delete a document from your Alert Profile at any time. It is hoped that it will result in a better understanding of the operation of radiation thermometers and also promote improved communication between the manufacturers and the end users. We have no amendments or corrections for this standard.

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A number in parentheses indicates the year of last reapproval. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Thisterm is used to differentiate single waveband radiation ther-mometers from those termed as ratio radiation thermometers,two channel radiation thermometers, two color radiationthermometers, multiwavelength radiation thermometers, mul-tichannel radiation thermometers, or multicolor radiation ther-mometers.

Referenced Documents2. Current edition approved July 1, Published July Originally approvedin Last previous edition approved in as E — 11a. DOI: United States Significance and Use4.

The test results can also serveas standard performance criteria for instrument evaluation orselection, or both. It is hoped that it will result in a better understandingof the operation of radiation thermometers and also promoteimproved communication between the manufacturers and theend users.

A user without sufficient knowledge and experienceshould seek assistance from the equipment makers or otherexpert sources, such as those found at the National Institute ofStandards and Technology in Gaithersburg, Maryland.

It is usually expressedas a temperature differential or a percent of full-scale value, orboth, and usually applies to value measured. See Fig. NOTE 3—Typical examples include nearly isothermal furnaces withinternal geometries, such as a sphere with an opening small relative to itsradius, or a right circular cylinder with one end closed having a radiussmall relative to its length.

The shuttermechanism shall activate within a time interval that is shortwhen compared with the response time of the test instrument. It shall be located with itsopening concentric with and perpendicular to the line of sightof the radiation thermometer.

In addition the iris should be shaded fromsources of intense extraneous radiation. See Note Eachaperture should be blackened and also mounted and protectedfrom extraneous sources of radiation as discussed in 5. Calibration Accuracy Test Method6. NOTE 4—The calibration accuracy is generally expressed as a tempera-ture difference or a percent of full-scale value, or both.

NOTE 5—The value applies across the entire measurement range. NOTE 6—If the reference temperature source is measured with otherthan a calibrated reference or secondary standard radiation thermometer,then the emissivity of the source enters into the calibration of the testradiation thermometer. Repeatability Test Method8. NOTE 8—The repeatability of the temperature indication is generallyexpressed as a temperature difference or a percent of full-scale value, orboth.

NOTE 9—The value for the repeatability can be applied across the entiremeasuring temperature range, or, the same test can be performed at otherselected temperatures across the measuring temperature range in order toassess the repeatability of the radiation thermometer at those temperatures.

Field—of—View Test Method9. See Figs. NOTE 10—Some radiation thermometers have a field-of-view so largethat a commercially available reference temperature source cannot beused; a separate test method is under preparation for use in such cases.

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