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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A number in parentheses indicates the year of last reapproval.

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

If you feel that your comments have not received a fair hearing you should make e374 views known to the ASTM Committee on Standards, at the address shown below. Perform calibration procedures at least once every 30 days.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. In such cases, it is permissible to ignore this requirement.

The condition of zero reading is satis? Last previous edition approved in as D — The balls used commercially in ball bearings are almost perfect spheres having diameters constant within a few microinches. The ratchet or thimble should bring up the pointer easily if a g weight is selected. This is in contrast to previously held perceptions of the necessity for maintaining constant average pressure.

The presser foot and anvil are regarded as in? Thickness of paper measured with a stack specimen deviates signi? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Hold the micrometer by this arm in such a way that the FIG.

Test Method E does not prohibit the testing of single sheet specimens of paper having nominal thickness under 2 mils. The initial reading estimates the specimen thickness. Procedures NOTE 3—In the remainder of this section the word test method denotes a combination of both a speci?

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

Adjust the wstm point. Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness. The other procedure uses the dial micrometer as a direct thickness reading instrument. This will minimize any tendency to disturb the thermal equilibrium between the instrument and the ambient during the thickness measurements. The arithmetic mean of the?

The number of fringes cut by a straight line connecting the terminals of any fringes is a measure of the deviation from? astn

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NOTE 6—The procedure of 9. The test methods identi? Equilibrium is attained when the zero point adjustment becomes negligible. 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. If practicable, make ten readings. This brings out the important point that at the periphery of the foot surface where d74 approaches RP approaches in?

Each material will differ in its response to test method parameters, which include, but may not be limited to: Calculate the arithmetic mean of these ten readings. An electronic instrument having a digital readout in place of the dial indicator is permitted if that instrument meets the other requirements of 6.

This standard has been approved for use by agencies of the Department of Defense.

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. The limit is related to the compressive characteristics of the material being measured. There may be instances, particularly when measuring very narrow strip specimens used for tensile tests, f374 so forth, when this requirement cannot be satis?

Precision and Bias Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

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

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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. D — 99 stock ast music-wire of known diameter are suitable substitutes. Those micrometers were perceived to have greater measurement reliability at the wider micrometer openings. Avoid using measurement positions that are less than mils from any specimen edge.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Design and construction of electrical machinery require that the thickness of insulation be known. By use of a proper manipulative procedure and a calibrated spring see Annex A1the pressure exerted on the specimen is controllable. Use these test methods except as otherwise required by a material specification.

After correcting the observed indicated thickness using the calibration c374 obtained in accordance with 7. If necessary, equip the asgm with a revolution counter that displays the number of complete revolutions of the large hand.

Determination of certain properties, such f374 relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness. Table 1 and Table 2 display basic differences of each test method and identify test methods applicable for use on various categories of materials. Reverse the rotation so as to open the micrometer 4 to 5 mils. This occurs unless the loads and radius are such that: Your comments are invited either for revision of this standard or f374 additional standards and should be addressed to ASTM International Headquarters.

Use standard gage blocks at points greater than 10 mil. Prior to calibration or thickness measurements, clean such surfaces by d3744 a piece of smooth, clean bond paper between the anvil and the presser foot and slowly moving the bond paper between the surfaces.