MIL-STD-1537C
CONTENTS
Paragraph Page
1 SCOPE·························································································· 1
1.1 Scope. ---------------------------------------------------------------------------------------------------- 1
2 APPLICABLE DOCUMENTS ····························································· 1
2.1 GeneraI. -------------------------------------------------------------------------------------------------- 1
2.2 Non-Government pubIications. --------------------------------------------------------------------- 1
2.3 Order of precedence. --------------------------------------------------------------------------------- 2
3 DEFINITIONS ················································································· 2
3.1 VoIume resistivity.-------------------------------------------------------------------------------------- 2
3.2 Conductivity.--------------------------------------------------------------------------------------------- 2
3.3 Percent IACS (InternationaI AnneaIed Copper Standard). ---------------------------------- 2
3.4 Eddy current instrument. ----------------------------------------------------------------------------- 2
3.5 Probe. ----------------------------------------------------------------------------------------------------- 3
3.6 Nonferrous conductivity standards.---------------------------------------------------------------- 3
3.7 Standard depth of penetration. --------------------------------------------------------------------- 3
3.7.1 EngIish Units. ------------------------------------------------------------------------------------------- 3
3.7.2 Metric Units. --------------------------------------------------------------------------------------------- 4
3.8 Lift-off effect. -------------------------------------------------------------------------------------------- 4
3.9 Direct reading eddy current instrument.---------------------------------------------------------- 4
3.10 Indirect reading eddy current instrument.-------------------------------------------------------- 4
4 GENERAL REQUIREMENTS····························································· 4
4.1 Equipment.----------------------------------------------------------------------------------------------- 4
4.1.1 Instruments. --------------------------------------------------------------------------------------------- 4
4.1.2 Instrument sensitivity.--------------------------------------------------------------------------------- 5
4.1.3 Instrument accuracy.---------------------------------------------------------------------------------- 5
4.2 Standards. ----------------------------------------------------------------------------------------------- 5
4.2.1 Laboratory conductivity standards. ---------------------------------------------------------------- 5
4.2.2 Instrument conductivity standards. ---------------------------------------------------------------- 5
4.3 CaIibration and standardization.-------------------------------------------------------------------- 5
4.3.1 Standardization. ---------------------------------------------------------------------------------------- 5
4.3.1.1 Standardization frequency. -------------------------------------------------------------------------- 5
4.3.1.2 Lift-off effect.--------------------------------------------------------------------------------------------- 6
4.3.2 Laboratory caIibration. -------------------------------------------------------------------------------- 6
4.4 Test articIe. ---------------------------------------------------------------------------------------------- 6
4.4.1 Surface.--------------------------------------------------------------------------------------------------- 6
4.4.2 Edge effect.---------------------------------------------------------------------------------------------- 6
4.4.2.1 Curvature correction factor.-------------------------------------------------------------------------- 6
4.4.3 SampIe thickness.-------------------------------------------------------------------------------------- 7
4.4.3.1 Thin specimens. ---------------------------------------------------------------------------------------- 7
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