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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The arithmetic average of the? See also Appendix X1. The condition of zero reading is satis?
The arithmetic mean of all thickness values is the thickness of the specimen. NOTE 6—The procedure of 9. Do not stop the motor until all of the measurements are made.
Table 1 and Table 2 display basic differences of each test method and identify test methods applicable for use on various categories d3774 materials. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Design and construction of electrical machinery require that the thickness of insulation be known.
The wire or the plug gage has a diameter dimension that is known to be within 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. There will be different precisions between test methods and between materials. This condition necessitates the cleaning of these surfaces see 7. The arithmetic mean of the? Place the gage block on the anvil, and slowly lower the presser foot.
Test Method E does not prohibit the testing of single sheet specimens of paper having nominal thickness under 2 mils. Summary of Test Methods 4. Equip the balance with an adjustable counterbalance. If the pressure is too low, discard the spring and replace with a new spring. Hold the micrometer by this arm in such a way that the FIG. NOTE 1—Avoid pulling any edge of the bond paper between the surfaces to reduce the probability of depositing any lint particles on the surfaces.
Perform calibration procedures at least once every 30 days. The use of a support structure, which is level and parallel to the anvil, is recommended to minimize such problems. The limit is related to the compressive characteristics of the material being measured. Dressing the edge of the presser foot to have a slight radius avoids this effect.
Observe this initial reading and then open the micrometer approximately 4 mils beyond the initial reading and move the specimen to the?
Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness. The initial reading estimates the specimen thickness. A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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.
Procedures NOTE 3—In the remainder of this section the word test method denotes a combination of both a speci? Test results using either procedure are not signi? In selecting loads to apply to the specimen, make a calculation to see if the resulting load and radius combination is too near the yield strength. The test methods identi? To help prevent this interference, select only clean specimens for testing and keep them and the thickness measuring instrument covered until ready to make measurements.
Make an initial reading 5 s after the presser foot has contacted the specimen surface. A standard specimen of known thickness of solid electrical insulation is not available for measurement of thickness by each of these test methods.
This brings out the important point that at the periphery of the foot surface where r approaches RP approaches in? For large specimens of such materials there may be a tendency to overhang the anvil and cause a bulging-up near the position of the presser foot. Prior to calibration or thickness measurements, clean such surfaces by inserting a piece of smooth, clean bond paper between the anvil and the presser foot and slowly moving the bond paper between the surfaces.
The procedures that follow are categorized according to the materials to which each applies.
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It is possible that combining values from the two systems will result in non-conformance with the standard. Their ashm is a measure of deviation from? After correcting the observed indicated thickness using the calibration chart obtained in accordance with 7.
D — 99 stock or music-wire of known diameter are suitable substitutes. Design and construction of electrical machinery require that the thickness of insulation be known.
An equation can be written expressing this idea using the equation for penetration written above: Use these test methods except as otherwise required by a material speci? Adjust the zero point. The ratchet or thimble asstm bring up the pointer easily if a g weight is selected. Data for the plot may be obtained by making a series of measurements on a specimen using different weights with a?
ASTM D – THICKNESS OF INSULATION (METHOD A-C)
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. Determination of certain properties, such as relative permittivity dielectric constant and volume resistivity, usually require a knowledge of the thickness.
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.
Use these test methods except as otherwise required by a material specification.