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Basis of App lication 6. E ï¿½ 11 6. Calibration and Standardization 8. Procedure 7. Standardization should be checked at frequent intervals during use. Attention should be given to Section 5 and Section 8. There are instances, however, where reference standards are made by other than instrument manufacturers. Foils are advantageous for standardizing on curved surfaces and are often more readily available than a coated standard.
To prevent measurement errors due to poor contact betwee n foil and substrate, make sure of intimate contact betwee n them. Foils are subject to indentation and should, therefore, be replaced when damaged. Nonconductive plastic foils can be used to standardize eddy-current instruments for measurement of nonconductive coatings. Local variations in coating thickness may also require that a number of measurements be made in any given area; this applies particularly to a rough surface.
E ï¿½ 11 same orientation as that used during standardization. In appropriate cases when a constant pressure probe is not being used, the use of a measuring stand is strongly recommended. For some instruments of the attractive force type, this is essential. With some instruments, however, it is desirable to tilt the probe slightly and select the angle of inclination giving the minimum reading. If, on a smooth this mayCleaning also be advisable with two-polematerials instruments.
Excess oil shall be wiped off so that the surface is virtually dry. If a magnetic instrument is to be used in a horizontal or upside-down position, calibrate it for that position.
Do not use this procedure with other coatings. For example, the pressure applied to a probe, or the rate of applying a balancing force to a magnet, will vary from one individual to another. Reduce or minimize such effects either by having the instrument calibrated by the same operator who will make the measurement or by using 9.
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|Netgear xet1001 software download||Foils are advantageous for standardizing on curved surfaces and are often more readily available than a coated standard. Nonconductive plastic foils can be used to standardize eddy-current instruments for measurement of nonconductive coatings. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor [email protected] e-mail ; or through the ASTM website www. To avoid the influences of severe or localized heat fected by article source astm e376 pdf free download. Roughness also may cause certain instruments to read high since their probes may rest on peaks. The store will not work correctly in the case when cookies are disabled. The accuracy is also affected by the interferences listed in Section 5, such as part geometry curvaturemagnetic permeability, and surface roughness.|
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Home astm-e Words: 3, Pages: 5. Designation: E ï¿½ 11 Standard Practice for Measuring Coating Thickness by Magnetic-Field or EddyCurrent Electromagnetic Testing Methods1 This standard is issued under the fixed designation E; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
This standard has been approved for use by agencies of the Department of Defense. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 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. Referenced Documents 2.
Current edition approved July 1, Published July Originally approved in Last previous edition approved in as E ï¿½ DOI: Terminology 3. Significance and Use 4. The limitations of a particular instrument are generally delineated by its manufacturer. Box , Arlingate Ln. AIA , Wilson Blvd. No further reproductions authorized. E ï¿½ 11 or reluctance of a magnetic flux path passing through the coating and substrate.
These gauges are designed to measure thickness of a nonmagnetic coating on a magnetic substrate. Some of them will also measure thickness of nickel coatings on a magnetic or nonmagnetic substrate. They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate.
The accuracy is also affected by the interferences listed in Section 5, such as part geometry curvature , magnetic permeability, and surface roughness.
See exceptions in Appendix X2. Interferences 5. Generally, the precision is a percentage of the coating thickness except at the lower end of the ranges where it is a fixed thickness. For practical purposes, magnetic variations in low-carbon AISI steels may be considered to be insignificant.
To avoid the influences of severe or localized heat treatments and cold working, the instrument should be standardized using a reference standard having a base metal with the same magnetic properties as that of the test specimen or, preferably and if available, with a sample of the part to be examined before application of the coating. This is the critical depth or thickness beyond which the instrument will no longer be affected by increase of substrate thickness.
Since it depends on the instrument probe and substrate, it should be determined experimentally. For example, such instruments are sensitive to differences between: 1 aluminum alloys, 2 chromium coatings deposited at different temperatures, and 3 organic coatings containing variable amounts of metallic pigments. Edge effect is usually a function of coil diameter. This sensitivity varies considerably between instruments and becomes more pronounced with increasing curvature.
Roughness also may cause certain instruments to read high since their probes may rest on peaks. For example, operation of gauge in a horizontal or upside-down position may require a new standardization or may be impossible. Basis of Application 6. The practice or standard used and its applicable revision shall be identified in the contractual agreement between the using parties.
The applicable edition of Specification E shall be specified in the contractual agreement. E ï¿½ 11 6. Since acceptance criteria are not specified in this standard, they shall be specified in the contractual agreement.
Very often it is possible to back up the substrates of standard and examination specimens with sufficient thickness of the same material to exceed the critical thickness and make readings independent of substrate thickness. The substrate may be ferrous or nonferrous. The coating or plating being measured may be electrically conducting or insulating as well as ferrous or non-ferrous.
The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
The limitations of a particular instrument are generally delineated by its manufacturer. The substrate material and coating combination to be measured as well as the inherent variations in the substrate and coating shall be reviewed prior to selecting the instrument to be used and the measurement accuracy required. These gauges are designed to measure thickness of a nonmagnetic coating on a magnetic substrate. Some of them will also measure thickness of nickel coatings on a magnetic or nonmagnetic substrate.
They can only be used if the electrical conductivity of the coating differs significantly from that of the substrate.
WebE Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Exami-nation Methods 1 This speci?cation is under the jurisdiction of . WebDownload Free PDF. Download. ASTM STANDARDS COVERING MAGNETIC AND EDDY CURRENT THICKNESS GAGES There are several other ASTM standards . WebMay 1, ï¿½ï¿½ ASTM E Standard Practice for Measuring Coating Thickness by Magnetic-Field or Eddy Current (Electromagnetic) Testing Methods English About Us .