ASTM D374 PDF

ASTM D Standard Test Methods for Thickness of Solid Electrical Insulation. GeoTesting Express is a provider of Geosynthetic Testing Services – ASTM D, Standard Test Methods for Thickness of Solid Electrical Insulation. This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D-9 on. Electrical.

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Link to Active This link will always route d3374 the current Active version of the standard. An electronic instrument having a digital readout in place of the dial indicator is permitted if that instrument meets the other requirements of 6. An equation can be written expressing this idea using the equation for penetration written above: If necessary, aetm the dial with a revolution counter that displays the number of complete revolutions of the large hand. Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness.

For very thin papers and values of n between 1 and 5, the ratio of total thickness of a stack of n sheets to n continuously decreases. The procedures that follow are categorized according to the materials to which each applies. Data for the plot may be obtained by making a series of measurements on a specimen using different weights with a?

Warning—Cleaning the presser foot and anvil surfaces as described in d74. Precision and Bias Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the asrm.

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NOTE 6—The procedure of 9. To avoid these costs, obtain procedures for cleaning such electronic gages from the instrument manufacturer. See also Note 6. Design and construction of electrical machinery require that the thickness of insulation be known. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Use standard gage blocks or other metallic objects of known thickness.

After correcting the observed indicated thickness using the calibration chart obtained wstm accordance with 7. Use these test methods except as otherwise required by a material speci? To help prevent this interference, select only clean specimens for testing and keep them and the thickness measuring qstm covered until ready to make measurements.

Make an initial reading 5 s after the presser foot has contacted the specimen surface. NOTE 7—When measuring the thickness of noticeably compressible aastm insulating papers, the purchaser and the supplier may wish to?

Slowly lower the presser foot onto the initial measurement location and observe the initial reading between 2 and 4 s after the presser foot contacts the specimen surface.

Adjust the zero point. Those micrometers were perceived to have greater measurement reliability at the wider micrometer openings. In addition, use an instrument for either Test Method C or D that has: Calculations using the equations in C374. The use of this technique does not require the construction of a calibration curve. The wire or the plug gage has a diameter dimension that is known to be within The test methods identi?

The presser foot and anvil are regarded as in? Details of the comparison procedure follow. This occurs unless the loads and radius are such that: Equip the balance with an adjustable aastm. See also Appendix X1.

ASTM D – THICKNESS OF INSULATION (METHOD A-C)

In selecting loads to apply to the specimen, make a calculation to see if the resulting load and radius combination is too near the yield strength. Test results using either procedure are not signi? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Table 1 and Table 2 display basic differences of each test method and identify test methods applicable for use on various categories asfm materials.

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There will be different precisions between test methods and between materials. Observe the indicated thickness. Last previous edition approved in as D — Ast of Test Methods 4. Lower the presser foot to a dial c374 approximately 0. D347 change in the setting is usually the result of contaminating particles carried from the specimen to the contacting surfaces of the presser foot and anvil. Consequently, if the radius of the presser foot is reduced by a factor, reduce the load by the same factor to keep the penetration, and therefore, the apparent thickness constant.

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. The arithmetic average of the? The balls used commercially in ball bearings are almost perfect spheres having diameters constant within a few microinches.

Use standard gage blocks at points greater than 10 mil. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Avoid using measurement positions that are closer than mils aatm any specimen edge. Select these subsequent measurement positions so that they are approximately on a line parallel to the cross machine direction of the paper.

For large specimens of such materials there may be a tendency to overhang the anvil and cause a bulging-up near the position of the presser foot.

Originally approved in