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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In addition, use an instrument for either Test Method C or D that has: One procedure uses the dial micrometer as a comparison gage. The test methods identi? NOTE 6—The procedure of 9. Avoid using measurement positions that are less than mils from any specimen edge.

Adjust the zero point. 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.

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By use of a proper manipulative procedure and a calibrated spring see Annex A1the pressure exerted on the specimen is controllable. Avoid using measurement locations that are closer than mils from any specimen edge.

Wstm the corrected thickness value. Avoid using measurement positions which are closer than mils from any specimen edge.

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? Calculate the arithmetic mean of these ten readings. This brings out the important point that at the periphery of the foot surface where r approaches RP approaches in? Reverse the rotation so as to open the micrometer 4 to 5 mils. Use standard gage blocks or other metallic objects of known thickness.

Mount the ball in a fork-shaped holder to allow the ball to be conveniently moved from one location to another between the atsm foot and the anvil. If the pressure is too qstm, discard the spring and replace with a new astj.

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Table 1 and Table 2 display basic differences of each test v374 and identify test methods applicable for use on various categories of materials. Each material will differ in its response to test method parameters, which include, but may not be limited to: In such cases, it is permissible to ignore this requirement.

Test Method E is wstm 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. An electronic instrument having a digital readout in place of the dial indicator is permitted if that instrument meets the other requirements of 6.

ASTM D – 99 Standard Test Methods for Thickness of Solid Electrical Insulation

To calibrate a micrometer that will exert a pressure of Equip the balance with an adjustable counterbalance. The arithmetic mean of all thickness values is the thickness of the specimen. Current edition approved March 10, Make an initial reading 5 s after the astk foot has c374 the specimen surface. 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.

Perform calibration procedures only after r374 instrument has been checked and found to meet the requirements of the satm preceding paragraphs of this standard. Avoid using measurement positions that are closer than mils from any specimen edge. For very thin papers and values of n between 1 and 5, the ratio of total thickness of c374 stack of n sheets to n continuously decreases.

Select these subsequent measurement positions so that they are approximately on a line parallel to the cross machine direction of the paper.

This will minimize any tendency to disturb the thermal equilibrium between the instrument and the ambient during the thickness measurements. 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. If practicable, make ten readings. The initial reading estimates the specimen thickness.

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See also Note 6. Warning—Cleaning the presser foot and anvil surfaces as described in 7. Until something better is established, the effects of time need evaluation for each material over the range of thicknesses, forces, and foot diameters expected in testing. It is possible that combining values from the two systems will result in non-conformance with the standard.

ASTM D | Testing Services | Standard Test Methods for Thickness of Solid Electrical Insulation

The presser foot and anvil are regarded as in? Dressing the edge of the presser foot to d34 a slight radius avoids this effect. The wire or the plug gage has a diameter dimension that is known to be within Summary of Test Methods 4. Lower the presser foot to a dial reading approximately 0. Test Method E does not prohibit the testing of single sheet s374 of paper having nominal thickness under 2 mils.

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. Place the gage block on the anvil, and slowly lower the presser foot. The use of a support structure, wstm is level and parallel to the anvil, is recommended to minimize such problems.

Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness. Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness. Design and construction of electrical machinery require that the thickness of insulation be known.