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ASTM D374 PDF

February 17, 2019

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

Data on rubber and recorder tape con? Data for the plot may be obtained by making a series of atsm on a specimen using different weights with aetm 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. Your comments will receive careful consideration at asgm meeting of the responsible technical committee, which you may attend.

A standard specimen of known thickness of solid electrical insulation is not available for measurement of thickness by each of these test methods. The other procedure uses the dial micrometer as a direct thickness reading instrument. Make the inside diameter of the coiled wire 6 3 mils with a 78 6 2-mil spacing between coil turns.

See also Note 6. Details of the comparison procedure follow. Do not stop the motor until all of the measurements are made.

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 pressure is the result of the ratio of the force 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? 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.

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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. NOTE 5—Originally, the selection of stack versus single sheet specimens was based on data obtained using manually operated micrometers. To avoid these costs, obtain procedures for cleaning such electronic gages from the instrument manufacturer. Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness.

In such cases, it is permissible to ignore this requirement.

Mount the ball in a fork-shaped holder to allow the ball to be conveniently moved from one location to another between the presser foot and the anvil. Use these test methods except as otherwise required by a material specification. 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 force applied to the presser foot spindle and the weight necessary to just prevent movement of the pointer from a higher to a lower reading shall be more than the minimum permissible force speci? Perform calibration procedures at least once every 30 days. 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.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

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This will minimize any tendency to disturb the thermal equilibrium between the instrument and the ambient during astn thickness measurements. Make an initial reading 5 s after wstm presser foot has contacted the specimen surface. This brings out the important point that at the periphery of the foot surface where r approaches RP approaches in?

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To calibrate a micrometer that will exert a pressure of If necessary, equip the dial with a revolution counter that displays the number of complete revolutions of the large hand. Avoid using measurement positions which are closer than mils from any asmt edge. Warning—Cleaning the presser foot and anvil surfaces as described in 7.

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.

Asm standard gage blocks or other metallic objects of known thickness. The arithmetic astk of all thickness values is the thickness of the specimen. The number of fringes cut by a straight line connecting the terminals of any fringes is a measure of the deviation from?

Adjust the zero point. The presser foot and anvil are regarded as in? D — 99 stock or music-wire of known diameter are suitable substitutes.

If the pressure is too low, discard the spring and replace with a new spring. NOTE 1—Avoid pulling any edge of the asgm paper between the surfaces to reduce the probability of depositing any lint particles on the surfaces.