MIL-DTL-5846D
4.3.1 Examination of product. The wire shall be subjected to a thorough general
inspection to ascertain that the materials, workmanship, and design are in strict
conformity with the requirements of this specification. The general inspection shall cover
requirements such as dimensions, color coding, weight, conformity of materials to
specification requirements, and ease of insulation stripping.
4.3.2 Electromotive force. (see 3.3.1.3)
4.3.2.1 Type 1, Classes A, B, C, D, and E. A thermocouple shall be formed from a
specimen taken from each coil or reel to be supplied in the contract or purchase order.
The electromotive force characteristics of the wire shall be determined at temperatures of
approximately 0°, 200°, 400°, 600°, 800°, and 1,000° C. The electromotive force
characteristics shall meet the tolerances specified in Table III.
4.3.2.2 Type 2, 3, and 4, Class A wire. A thermocouple shall be formed from a specimen
of the wire, and the electromotive force characteristics of the wire shall be determined at
temperatures of approximately 0°, 100°, and 200 ° C. The measured electromotive force
shall meet the tolerances listed in Table III. One specimen shall be taken from each coil
or reel of the wire.
4.3.3 Resistance. The total resistance (chromel and alumel conductor) of each finished
coil or reel of wire shall be determined at, or the determined resistance corrected to, 25°C
and shall be expressed as resistance per 25 feet for Type 2 wire, 50 feet for Type 3 wire,
and 100 feet for Type 4 wire. The wire shall be certified, stating the resistance to two
decimal places calculated for a length of 25, 50, or 100 feet as applicable for 25° C, date
of test, and name of person performing the test. In making this test, care shall be
exercised so that any thermal emf developed by joining the chromel and alumel wire does
not affect the results. The resistance of the wire shall conform to Table I. The following
expressions may be used for converting resistances measured at temperatures other than
25° C to resistance at 25° C:
Chromel conductor
3125 Rt
R25 = 3100 +c
Alumel conductor
457.96 Rt
R25 = 432.96 +c
Where R25 is Resistance at 25° C
Rt is Resistance at temperature (t) in ohms.
Temperature at which resistance was measured in degrees
Celsius.
4.3.4 Dielectric strength. One inch of the insulation shall be removed from each end of
three 36-inch specimens of the wire. The samples shall be immersed in a saturated
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