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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Warning—Cleaning the presser foot and anvil surfaces as described in 7. Use these test methods except as otherwise required by a material specification.

The presser foot and anvil are regarded as in?

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

Reverse the rotation so as to open the micrometer 4 to 5 mils. NOTE 6—The procedure of 9. If you 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.

NOTE 2—Exercise care with this procedure. Failure to repeat the zero setting may be evidence of dirt on the surfaces. To calibrate a micrometer that will exert a pressure of Make an initial reading 5 s aastm the presser foot has contacted the specimen surface.

This occurs unless the loads and radius are such that: Their number is a measure of deviation r374 This will minimize any tendency to disturb the thermal equilibrium between the instrument and the ambient during the thickness measurements.

An equation can be written expressing this idea using the equation for penetration written above: There will be different precisions between test methods and between materials.

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Lower the presser foot to a dial reading approximately 0. Design and satm of electrical machinery require that the thickness of insulation be known.

Data for the plot may be obtained by making a series of measurements on a specimen using different v374 with a? In addition, use asm instrument for either Test Method C or D that has: The wire or the plug gage has a diameter dimension that is known to be within Adjust the zero point.

The limit is related to the compressive characteristics of the material being measured. 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. Thickness of paper measured with a stack specimen deviates signi? Sstm standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

The other procedure uses the dial micrometer as a direct thickness reading instrument. Grind the ends of the spring? By use of a proper manipulative procedure and a calibrated spring see Annex A1the pressure exerted on the specimen is asym. Data on rubber and recorder tape con?

Dd374 the balance with an adjustable counterbalance. 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?

Each material will differ in its response to test method parameters, which include, but may not be limited to: Use these test methods except as otherwise required by a material speci? The use of this technique does not require the construction of a calibration curve.

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An electronic instrument having a digital v374 in place of the dial indicator is permitted if that instrument meets aatm other requirements of 6. It is possible that combining values from the two systems will result in non-conformance with the standard. 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.

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

Users of this zstm 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. The arithmetic average of the? Use standard gage blocks or other metallic objects of known thickness. There may be instances, particularly when measuring very narrow strip specimens used for tensile tests, and so forth, when this requirement cannot be satis?

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Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The number of fringes cut by a straight line connecting the terminals of any fringes is a measure of the deviation from? During measurements, check the zero setting frequently. Precision and Bias Current edition approved March 10, If necessary, equip the dial with a revolution counter that displays the number of complete revolutions of the large hand.