MIL-DTL-9398D
4.2.1 Standard test conditions. Unless otherwise specified herein, all required tests shall
be made under the following conditions:
a. Temperature - ambient room ((77 °F ± 9 °F) (25 °C ± 5 °C)).
b. Pressure - normal atmospheric (approximately 29.92 inches of mercury (Hg)).
c. Humidity - room ambient up to 90 percent relative humidity.
4.2.2 Test indicator. Whenever a tachometer indicator is specified for conducting tests, a
magnetic drag-type indicator in accordance with MIL-I-22596 or MIL-I-25623 shall be used.
4.2.3 Voltage. All voltages specified herein are root-mean-square (RMS) values.
Voltmeters used to measure voltage shall be of a type free from frequency errors. If the voltmeter
draws appreciable current, the specified loads shall be adjusted so that the combined voltmeter and
load will form a balanced load equivalent to the specified load. The voltmeter shall have an
accuracy of 1 percent or better and meter errors shall not be included in the errors attributed to the
generator. Unless otherwise specified, all voltage readings shall be made after a five and before a
ten minute generator warm-up at 4,200 RPM with a load of three 40-ohm Y-connected resistances.
4.3. Qualification inspection. The qualification inspection shall consist of all the tests in
the order specified in paragraph 4.5.
4.3.1 Qualification inspection sample. The qualification test samples shall consist of four
generators representative of the production process. The generators submitted for qualification shall
have previously been subjected to the individual tests specified in paragraph 4.4.1.
4.4 Conformance inspection. Conformance inspection shall consist of the individual tests
of 4.4.1 for each unit produced and, if required by the procuring activity (see 6.2), sampling
plan A (see 4.4.2) or sampling plan B (see 4.4.3). Conformance inspection shall be in accordance
with MIL-STD-1916 as specified. The contractor shall furnish test reports showing quantitative
results for all tests required by this specification that have been signed by an authorized
representative of the contractor or laboratory, as applicable.
4.4.1 Individual tests. Each generator shall be subjected to the following tests.
a.
Examination of product (see 4.5.1).
b.
Dielectric strength (see 4.5.2).
c.
Continuity and resistance (see 4.5.3).
d.
Phase rotation (see 4.5.4).
e.
Voltage (4.5.5).
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