MIL-DTL-15109D
TABLE I. Qualification, retention, and conformance inspections.
Description and order of
Qualification
Retention of
Conformance
Requirement
Test method
tests
Inspection
qualification
inspection
Examination
X
X
X
3.2
4.5.1
Weight
X
X
4.5.2
Creepage and
X
X
4.5.3
clearance
Resistance
X
X
X
3.2.1
4.5.4
General operation
X
X
X
4.5.5
Enclosures
X
X
3.3.5
4.5.6
Temperature rise
X
X
3.3.6
4.5.7
Life
X
3.5.1
4.5.8
Vibration
X
3.5.3
4.5.10
Insulation resistance
X
X
3.5.5
4.5.12
Dielectric
X
X
X
4.5.13
Shock
X
X
3.5.4
4.5.11
Salt spray
X
3.5.2
4.5.9
4.2.1 Number of samples. Three resistors or rheostats of each size and wattage shall be furnished. Minimum,
median, and maximum resistance values shall be represented.
4.3 Retention of qualification. Every 12 months, one resistor and rheostat of each size and wattage shall be
subjected to the retention of qualification inspection specified in table I. In the event that qualification tests are made
on preproduction units, the first retention of qualification inspection shall be made on samples from the first
production run. It is not required for the tests to be conducted on more than 1 out of 50 resistors or rheostats of a
given design manufactured over a period of 3 years.
4.4 Conformance inspection. Each resistor and rheostat shall be subjected to the conformance inspection
specified in table I. If this inspection reveals variations beyond normal manufacturing tolerances, the Government
may require that any portion, or all of the retention of qualification inspections be repeated to demonstrate
conformance with this specification.
4.5 Test methods.
4.5.1 Examination. Each resistor or rheostat shall be subjected to examination to ascertain that the fit, materials
and workmanship conform to this specification.
4.5.2 Weight. The weight of the equipment shall be taken and recorded. The weight shall not differ from the
design value by more than 10 percent.
4.5.3 Creepage and clearance distances. Creepage and clearance distances shall be demonstrated by actual
measurement to be in accordance with MIL-E-917.
4.5.4 Resistance. The overall resistance of resistors and rheostats shall be measured to determine that they are
within 10 percent of the design values. The temperature at which resistance readings are taken shall be recorded.
4.5.5 General operation. General operation shall include any tests necessary to ascertain that the required
operating requirements have been met.
4.5.6 Enclosures. No tests are required. Dripproof enclosures shall be given an examination to determine that
falling moisture or dirt will not interfere with the mechanical or electrical operation of the equipment enclosed when
inclined to any angle not exceeding 45 degrees from the vertical.
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