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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This will minimize any tendency to disturb the thermal equilibrium between the instrument and the ambient during the thickness measurements. Data on rubber and recorder tape ast, Lower the presser foot to a dial reading approximately 0.

Perform calibration procedures only after the instrument has been checked and found to meet the requirements of the pertinent preceding paragraphs of this standard. Make the inside diameter of the coiled wire 6 3 mils with astj 78 6 2-mil spacing between coil turns. Observe this initial reading and then open the micrometer approximately 4 mils beyond the initial reading and move the specimen to the?

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The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other. The micrometer reading of the stack, corrected from the calibration chart, is divided by the number of layers in the stack and reported as the thickness. This is in contrast to previously held perceptions of the necessity for maintaining constant average pressure.

If necessary, equip the dial with a revolution counter that displays the number of complete revolutions of the large hand. Each material will differ in its response to test method parameters, which include, but may not be limited to: 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.

In such cases, it is permissible to ignore this requirement. Dressing the edge of the presser foot to have a slight radius avoids this effect. Diameter Spindles Pressure, psig 21 22 23 24 25 26 27 28 29 Weight, g clamping pressure of the arm support will not distort the micrometer frame.

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

If this is not achievable after disassembly, cleaning, and lubrication, replace the instrument. NOTE 5—Originally, the asstm of stack versus single sheet specimens was based on data obtained using manually operated micrometers. Calculations using the equations in X1.

NOTE 4—An electronic gage may be substituted for the dial gage in Test Method C if the presser foot and anvil meet the requirements of that test method. Data for the plot may be obtained by making a series of measurements on a specimen using different weights with a? Design and construction of electrical machinery require that the thickness of insulation be known. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

This condition necessitates the cleaning of these surfaces see 7. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

If the radius of the hemisphere is reduced by 4, the load on the gage must be reduced by a factor of 2 to maintain the same penetration.

This brings out the important point that at the periphery of the foot surface where r approaches RP approaches in? Test Method E is also the preferred test method for use with any paper of nominal thickness from 2 to 26 mils using a specimen consisting of a single sheet.

Historical Version s – view previous versions of standard. There may be instances, particularly when measuring very narrow strip specimens used for tensile tests, and so forth, when this requirement cannot be satis? NOTE 6—The procedure of 9. Avoid using measurement positions that are less than mils from any specimen edge.

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Hold the micrometer by this arm in such e374 way that the FIG. Use these test methods except as otherwise required by a material specification.

Mount the ball in aetm fork-shaped holder to allow the ball to be conveniently moved from one location to another between d74 presser foot and the 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. That error magnitude will increase as specimen thickness decreases. Summary of Test Methods 4.

The presser foot and anvil are regarded as in? A 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. The shape, location, and number of these bands indicate the deviation from? Place the gage block on the anvil, and slowly lower the presser foot. This pressure is the result of the ratio of the asym on the specimen exerted by gravity on the 3 oz weight of the presser foot assembly, out of contact with the lifting mechanism to the speci?

The arithmetic mean of the?

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Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness. Until something better is established, the effects of time need evaluation astj each material over the range of thicknesses, forces, and foot diameters expected in testing. Avoid using measurement positions that are closer than mils from any specimen edge. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Equip the balance with an adjustable counterbalance. Details of the comparison procedure follow.