MIL-STD-1537 Revision C:2002

1 SCOPE
  1.1 Scope
2 APPLICABLE DOCUMENTS
  2.1 General
  2.2 NonGovernment publications
  2.3 Order of precedence
3 DEFINITIONS
  3.1 Volume resistivity
  3.2 Conductivity
  3.3 Percent IACS (International Annealed Copper Standard)
  3.4 Eddy current instrument
  3.5 Probe
  3.6 Nonferrous conductivity standards
  3.7 Standard depth of penetration
       3.7.1 English Units
       3.7.2 Metric Units
  3.8 Liftoff effect
  3.9 Direct reading eddy current instrument
  3.10 Indirect reading eddy current instrument
4 GENERAL REQUIREMENTS
  4.1 Equipment
       4.1.1 Instruments
       4.1.2 Instrument sensitivity
       4.1.3 Instrument accuracy
  4.2 Standards
       4.2.1 Laboratory conductivity standards
       4.2.2 Instrument conductivity standards
  4.3 Calibration and standardization
       4.3.1 Standardization
             4.3.1.1 Standardization frequency
             4.3.1.2 Liftoff effect
       4.3.2 Laboratory calibration
  4.4 Test article
       4.4.1 Surface
       4.4.2 Edge effect
             4.4.2.1 Curvature correction factor
       4.4.3 Sample thickness
             4.4.3.1 Thin specimens
       4.4.4 Clad Specimens
       4.4.5 Alclad specimens
  4.5 Personnel qualification
       4.5.1 Direct reading instruments
       4.5.2 Indirect reading instruments
5 DETAIL REQUIREMENTS
  5.1 Procedure
       5.1.1 Hardness tests
       5.1.2 Conductivity tests
             5.1.2.1 Acceptable mechanical properties
       5.1.3 Correction factors for conductivity readings
             on round stock
       5.1.4 Liftoff correction factors
       5.1.5 Operating precautions
  5.2 Conductivity requirements
6 NOTES
  6.1 Intended use
  6.2 Issue of DoDISS
  6.3 Subject term (key word) listings
  6.4 Report of results
  6.5 Changes from previous issues

Outlines ways of verifying aluminum alloy heat treatment using eddy current methods which measure electrical conductivity.

This standard contains procedures for verifying aluminum alloy heat treatment by means of eddy current techniques, which measure electrical conductivity. Aluminum alloy heat treatment can be verified when electrical conductivity measurements are used in conjunction with hardness measurements.