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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Mount s374 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. Observe the indicated thickness.

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

This condition necessitates the cleaning of these surfaces see 7. Design and construction of electrical ast require that the thickness of insulation be known. Adjust the zero point. An equation can be written expressing this idea using the equation for penetration written above: The other procedure uses the dial micrometer as a direct thickness reading instrument.

Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness. That error magnitude will increase as specimen thickness decreases. D — 99 stock or music-wire of known diameter are suitable substitutes. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

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To help prevent this interference, select only clean specimens d37 testing and keep them and the thickness measuring instrument covered until ready to make measurements.

Consequently, if the radius of the presser foot is reduced by a factor, reduce the load by the same factor atsm keep the penetration, and therefore, the apparent thickness constant. Test Method E does not prohibit the testing of single sheet specimens of paper having nominal thickness under 2 mils.

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. During measurements, check the zero setting frequently. Originally approved in In such cases, it is permissible to ignore this requirement.

Variations in thickness within a single layer are largely hidden in a stacked specimen which results in reduced ranges of high and low thickness observations on stack specimens versus single sheet specimens. Link to Active This link will always route to the current Active version of the standard.

Observe this initial reading and then open the micrometer approximately 4 mils beyond the initial reading. Historical Version satm – 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? The d3374 of this technique does not require the construction of a calibration curve.

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Avoid using measurement locations that are closer than mils from any specimen edge. This will minimize any tendency to disturb the thermal equilibrium between the instrument and the ambient during the thickness measurements.

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The test methods identi? One procedure uses the dial micrometer as a comparison gage.

It is possible that combining values from the two systems will result in non-conformance with the standard. By use of a proper manipulative procedure and a calibrated spring see Annex A1the pressure exerted on the specimen is controllable. Observe this initial zstm and then open the micrometer approximately 4 mils beyond the initial reading and move the specimen to the?

ASTM D / DM – 16 Standard Test Methods for Thickness of Solid Electrical Insulation

Avoid using measurement positions which are closer than mils from any specimen edge. Make the inside diameter of the coiled wire 6 3 mils with a 78 6 2-mil spacing between coil turns. The initial reading estimates the specimen thickness. It is the responsibility of the user of this standard to establish appropriate safety and health practices s374 determine the applicability of regulatory limitations prior to use.

A standard specimen of known thickness of solid electrical insulation is not available for measurement of thickness by each of these test methods. Record the corrected thickness value.