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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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. This is in contrast to previously held perceptions of the necessity for maintaining constant average pressure.

Design and construction of electrical machinery require that the thickness of insulation be known.

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. Observe the indicated thickness. 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.

NOTE 2—Exercise care with this procedure. 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.

If this is not achievable after disassembly, cleaning, and lubrication, replace the instrument. It is possible that combining values from the two systems will result in non-conformance with the standard.

Record the corrected thickness value. D734 previous edition approved in as D — NOTE 5—Originally, the selection of stack versus single sheet specimens was based on data obtained using manually operated micrometers. 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.

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NOTE 1—Avoid pulling any edge of the bond paper between the surfaces to reduce the d3744 of depositing any lint particles on the surfaces. Calculations using the equations in X1. Equilibrium is attained when the zero point adjustment becomes asgm.

Their number is a measure of deviation from? 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 atsm To calibrate a micrometer that will exert a pressure of Test Method E does not prohibit the testing of single sheet specimens of paper having nominal thickness under 2 mils.

Warning—Cleaning the presser foot and anvil surfaces as described in 7. Each material will differ in its response to test method parameters, which include, but may not be limited to: This will minimize 3d74 tendency to disturb the thermal equilibrium between the instrument and the ambient during the thickness measurements.

Calculate the arithmetic mean of these ten readings. 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 and move the specimen to the? If necessary, equip the dial with a asmt counter that displays the number of complete revolutions of the large hand.

Grind the ends of the spring? 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.

ASTM D | Testing Services | Standard Test Methods for Thickness of Solid Electrical Insulation

Perform calibration procedures only after the instrument has been checked and found to meet the requirements of the pertinent preceding paragraphs of this standard. The shape, location, and number of these bands indicate the deviation from? If the pressure is too low, discard the spring and replace with a new spring. Variations in thickness within a single layer are largely hidden in a stacked specimen which results in reduced ranges of high atsm low thickness observations on stack specimens versus single sheet specimens.

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This standard has been approved for use by agencies of the Department of Defense. Do not stop the motor until all of the measurements are made. The reader is directed to seek precision statements in those other ASTM standards that deal with speci? Those micrometers were perceived to have greater measurement reliability at the wider micrometer openings.

Such a micrometer is described in Section 6 as Apparatus A. See also Note 6. The number of fringes cut by a straight line connecting the terminals of any fringes is a measure of the deviation from?

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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. Reverse the rotation so as to open the micrometer 4 to 5 mils. Make the inside diameter of the coiled wire 6 3 mils with a 78 6 2-mil spacing between coil turns.

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. 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.