定价： 598元

定价： 316元

定价： 689元 / 折扣价： 586 元

定价： 325元

定价： 598元

定价： 220元

定价： 424元

This test method permits interlaboratory comparison and intralaboratory correlation of instrumental temperature scale data.Dielectric analyzers are used to characterize a broad range of materials that possess dielectric moments. One of the desired values to be assigned by the measurement is the temperature at which significant changes occur in the properties of the test specimen. In order to obtain consistent results from one period of time to another and from one laboratory to another, the temperature signal from the apparatus must be calibrated accurately over the temperature range of interest.1.1 This test method covers the temperature calibration of dielectric analyzers over the temperature range from -100 to 300°C and is applicable to commercial and custom-built apparatus. The calibration is performed by observing the melting transition of standard reference materials having known transition temperatures within the temperature range of use.1.2 Electronic instrumentation or automated data analysis and data reductions systems or treatment equivalent to this test method may be used.1.3 The values stated in SI units are to be reported as the standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.

定价： 0元

1.1 This practice covers a means for calibration of the heat flow meter apparatus in conjunction with Test Method C518. The apparatus shall be calibrated as a unit, with the heat flux transducer(s) installed in the apparatus using either standard reference materials (SRM), calibrated transfer specimens (CTS), or other appropriate reference standards. 1.2 This practice applies to the calibration of a heat flow meter apparatus over a wide range of heat flow rates and temperatures that permits the testing of a wide variety of insulation materials over an extended temperature range. It is applicable to materials with the same requirements and temperature ranges allowed in Test Method C518. 1.3 This standard does not purport to address all of the safety concerns, 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.

定价： 0元

5.1 Differential scanning calorimetry is used to determine the heat or enthalpy of transition. For this information to be meaningful in an absolute sense, heat flow calibration of the apparatus or comparison of the resulting data to that of a known standard is required.5.2 This practice is useful in calibrating the heat flow axis of differential scanning calorimeters or quantitative differential thermal analyzers for subsequent use in the measurement of transition energies and specific heat capacities of unknowns.1.1 This practice covers the heat flow calibration of differential scanning calorimeters over the temperature range from − 130°C to  +800°C.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 Computer or electronic based instruments, techniques or data manipulation equivalent to this practice may also be used.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See also Section 7.

定价： 0元

The strength and performance of heat-strengthened and fully tempered glass is greatly affected by the surface and edge stress induced during the heat-treating process.The edge and surface stress levels are specified in Specification C 1048, in the Engineering Standards Manual of GANA , and in foreign specifications.Surface stresses can be measured nondestructively using methods, such as Test Method C 1279. The calibration of surface measuring devices used in those procedures and periodic verification of calibration are needed. This test method offers a convenient way to accomplish this task.1.1 This test method covers calibration or verification of calibration, or both, of surface-stress measuring devices used to measure stress in annealed and heat-strengthened or tempered glass using polariscopic or refractometry based principles.1.2 This test method is nondestructive.1.3 This test method uses transmitted light, and therefore, is applicable to light-transmitting glasses.1.4 This test method is not applicable to chemically tempered glass.1.5 Using the procedure described, surface stresses can be measured only on the “tin” side of float glass.1.6 This standard does not purport to address all of the safety concerns, 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.

定价： 0元

1.1 This practice provides for the establishment and maintenance of calibration procedures for measuring and test equipment used for electrical insulating materials. It provides a framework of concepts and practices, with definitions and specifications pertaining to measurement, adequacy of standards, necessary environmental controls, tables of corrections, intervals of calibration, calibration procedures, calibration of standards, and personnel training system documentation.1.2 This practice is intended for control of the accuracy of the equipment used for measurements that are made in accordance with ASTM standards or other specified requirements.1.3 The values stated in metric units are regarded as the standard. The values in inch-pound or English units are for information only.1.4 This standard does not purport to address all of the safety concerns, 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.

定价： 0元

1.1 This method covers the calibration of reference pyranometers with field angles of 180° (2[pi] steradians) utilizing self-calibrating absolute cavity pyrheliometers having field angles of 5.0° and slope angles of 0.75 to 0.8° as the primary reference instrument. 1.2 This method is applicable to reference pyranometers regardless of the radiation receptor employed. 1.3 Two types of calibrations are covered: (1) Type I employs a self-calibrating absolute cavity pyrheliometer, and (2) Type II calibrations employ a secondary reference pyrheliometer as the standard instrument. 1.4 This standard calibration of reference pyranometers covers the sensitive element in the horizontal plane only, that is, with the axis vertical. The calibration of reference pyranometers at various tilt angles is covered in another ASTM standard (see Section 2.). 1.5 This method is only applicable to calibration procedures using light from the sun.

定价： 0元

5.1 This test method is suitable for determining the concentrations of known impurities in finished benzene and for use as an integral quality control tool where benzene is either produced or used in a manufacturing procedure. It is generally applied to impurities such as nonaromatics containing nine carbons or less, toluene, C8 aromatics, and 1,4-dioxane.5.2 Absolute purity cannot be determined if undetected impurities are present.1.1 This test method covers the determination of normally occurring trace impurities in, and the purity of, finished benzene by gas chromatography with external calibration. A similar test method, using the internal standard technique of calibration is Test Method D4492.1.2 This test method is applicable for nonaromatic hydrocarbon impurities at levels from 5 to 2000 mg/kg and for benzene purities of 99.80 weight % or higher.1.3 This test method is applicable for aromatic impurities from 5 to 2000 mg/kg in benzene.1.4 This test method has been found applicable to heteroatomic species such as 1,4-dioxane, from 10 to 2000 mg/kg in benzene.1.5 The limit of detection for aromatic impurities is 0.9 mg/kg, 2.7 mg/kg for 1,4-dioxane and 1.1 mg/kg for methyl cyclohexane.1.6 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.8 This standard does not purport to address all of the safety concerns, 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. For specific hazard statements, see Section 9.

定价： 0元

1.1 This practice covers procedures for calibrating and determining performance of an optical discrete airborne particle counter (DAPC) when presented with a challenge aerosol of near-monodisperse spherical particles. The practice is directed towards determination of accuracy and resolution of the DAPC for particles which have entered the sampling inlet of the DAPC. Consideration of inlet sampling efficiency is not part of this practice.1.2 The procedures covered here include inlet sample flow rate, zero count level, particle sizing accuracy, particle sizing resolution, particle counting efficiency, and particle concentration limit.1.3 The particle size parameter that is reported is the equivalent optical diameter based on projected area of a particle of known refractive index which is suspended in air. The minimum diameter that can be reported by a DAPC is normally specified by the manufacturer and the maximum diameter that can be reported for a single sample is determined by the dynamic range of the DAPC being used. Typical minimum diameters are in the range from approximately 0.05 m to 0.5 m and a typical dynamic range specification will be between 10 to 1 and 50 to 1.1.4 The counting rate capability of the DAPC is limited by temporal coincidence for the specific instrument and by the maximum counting rate capability of the electronic sizing and counting circuitry. Coincidence is defined as the simultaneous presence of more than one particle within the DAPC optically defined sensing zone at any time. The coincidence limit is a statistical function of the airborne particle concentration and the sensing zone volume (1). This limitation may be modified by the presence of particles with dimension so large as to be a significant fraction of the sensing zone dimension (2). The saturation level or maximum counting rate of the electronic counting circuitry shall be specified by the manufacturer and is always greater than the DAPC counting rate for the challenge aerosol used for any portion of this practice.1.5 Calibration in accordance with all parts of this practice may not be required for routine field calibration of a DAPC unless significant changes have been noted in operation of the DAPC or major DAPC component repairs or replacements have been made. In that situation, the DAPC should be taken to a suitable metrology facility for complete calibration, following necessary repairs or modifications. Normally, the routine field calibration may consist of determination of inlet flow rate, zero count level, and particle sizing accuracy. The DAPC functions to be calibrated shall be field or metrology facility calibrations shall be determined by agreement between purchaser and user, but shall not exceed 12 months, unless DAPC stability for longer periods is verified by measurements in accordance with this practice.1.6 This standard does not purport to address all of the safety concerns, 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.

定价： 0元