MIL-STD-1537C
4.5 Personnel qualification.
4.5.1 Direct reading instruments.
Personnel performing tests using direct reading instruments shall receive sufficient instruction
for proper performance of the test and utilization of the equipment. Proper performance includes the capability to demonstrate operation and standardization of the equipment in accordance with the requirements of this standard.
4.5.2 Indirect reading instruments.
Personnel performing conductivity tests using indirect reading eddy current instruments shall be qualified to level II requirements in accordance with AIA/NAS 410.
5 DETAIL REQUIREMENTS
5.1 Procedure.
5.1.1 Hardness tests.
Measure the hardness of the first part in the lot to be tested to determine if the parts are in proper heat-treated condition or the as quenched condition. Perform Rockwell hardness in accordance with either ASTM E10 or ASTM E18.
5.1.2 Conductivity tests.
Maintain the temperature of the test probe, the standards and the test material within 3°C (5.4°F) of each other. Operate the electrical conductivity instrument in accordance with this standard and the manufacturer's recommendations. When tests are being made, the probe must be firmly pressed against the surface of the material or part. The condition of the part or material being tested shall meet the requirements (see 4.4). Readings of unsatisfactory or questionable conductivity must always be verified by a recheck of the instrument calibration
standards and then a hardness measurement must be performed on the material before making a disposition.
5.1.2.1 Acceptable mechanical properties.
Acceptable hardness or conductivity, or both, of aluminum alloy materials does not guarantee acceptable mechanical properties. Inspection shall be based upon evidence of specified heat treatment or cold working on the accompanying fabrication outline or written certification, as well as on acceptable hardness and conductivity readings.
5.1.3 Correction factors for conductivity readings on round stock.
A suggested procedure for establishing a curvature correction factor for round stock (see
4.4.2.1) is by using flat stock of the same material and temper as the round stock to be tested or material having conductivity within 5 %IACS of the stock to be tested. Measure the conductivity of the flat stock with an eddy current instrument (reading "a"). Then machine the flat stock to a radius within the tolerance of the radius on the round stock to be tested. Again measure the conductivity (reading "b") using a fixture to hold the probe in the same position as is to be used on the round stock to be tested. The correction factor to be added to the readings on the round
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