ASTM D374 PDF

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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 initial reading estimates the specimen thickness. Equilibrium is attained when the zero point adjustment becomes negligible.

By use of a proper manipulative procedure and aastm calibrated spring see Annex A1the pressure exerted on the specimen is controllable.

Select these subsequent measurement positions so that they are approximately on a line parallel to the cross machine direction of the paper. Observe this initial reading and then open the micrometer approximately 4 mils beyond the initial reading and move the c374 to the? 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.

Summary of Test Methods 4.

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

D34 using measurement locations that are closer than mils from any specimen edge. Perform calibration procedures only after the instrument has been checked and found to meet the requirements of the pertinent preceding paragraphs of this standard.

Last previous edition approved in as D — The number of fringes cut by a straight line connecting the terminals of any fringes is a measure of the deviation from?

Data on rubber and aetm tape con? Such a micrometer is described in Section 6 as Apparatus A. The condition of zero reading is satis? One procedure uses the dial micrometer as a comparison gage. NOTE 2—Exercise care with this procedure. Data for the plot may be obtained by making a series of measurements on a specimen using different weights with a?

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The arithmetic average of the? Atsm brings out the important point that at the periphery of the foot surface where r approaches RP approaches in? During measurements, check the zero setting frequently. The arithmetic mean of the?

Their number is a measure of deviation from? NOTE 5—Originally, the selection of stack versus single sheet specimens was based on data obtained using manually operated micrometers. Design and construction of electrical machinery require that the thickness of insulation be known.

See also Note 6. Historical Version s – view previous versions of standard. 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.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? It is possible that combining values from the two systems will result in non-conformance with the standard.

Thickness of paper measured with a stack specimen deviates signi? 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.

Those micrometers were perceived to have greater measurement reliability at the wider micrometer openings. Equip the balance with an adjustable counterbalance. If ast 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. Reverse the rotation so as to open the micrometer 4 to 5 mils. The other procedure uses the dial micrometer as a direct thickness reading instrument.

Each material will differ in its response to test method parameters, which include, but may not be x374 to: If necessary, equip the dial with a revolution counter that displays the number of complete revolutions of the large hand.

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.

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. If the pressure is too low, discard the spring and replace with a new spring. An equation can be written expressing this idea using the equation for penetration written above: Avoid using measurement positions that are less than mils from any specimen edge.

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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? Avoid using measurement positions which are closer than mils from any specimen edge. Test Method E is also the preferred test method for use with any paper of nominal asttm from 2 to 26 mils using a specimen consisting of a single sheet.

The use of a support structure, which is level and parallel to the anvil, is recommended to x374 such problems. 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.

To avoid these costs, obtain procedures for cleaning such electronic gages from the instrument manufacturer. For other pressures, refer to Table A1. A standard specimen of known thickness of solid electrical insulation is not available for measurement of thickness by each of these test methods. Details of the comparison procedure follow.

For very thin papers and values of n between 1 and 5, the ratio of total thickness of a stack of n sheets to n continuously decreases. NOTE 4—An electronic gage may be asm for the dial gage in Test Method C if the presser foot and anvil meet the requirements of that test method.

NOTE 6—The procedure of 9. The limit is related to the compressive characteristics of the material being measured.