MIL-PRF-62061D
4.4.2 Laboratory test conditions. Tests shall be conducted under general laboratory
conditions acceptable to the Government. The ambient room temperature shall be maintained at
77 ±15 F. The test units shall be stabilized for 1 hour before being subjected to the tests. The
generator shall be tested in combination with a blower and adapter (see 6.7).
4.4.3 Stabilized temperature. The generator system shall be considered to be
temperature stabilized when operations under constant conditions fails to cause a change in the
test unit temperature in excess of 2 F in any 5-minute period of any 20 minute test.
4.4.4 Laboratory test condition. The test circuit of figure 5 or Government approved
equivalent shall be used whenever applicable. Readings shall be corrected for variations in the
ambient temperature by use of the following formula:
Output (observed)
Output(corrected) =
1 + .00214 (77-T)
Where T = ambient temperature, F
4.5 Operating requirements verification.
4.5.1 Polarity. To determine conformance to 3.3.1, the negatively grounded electrical
circuit shall be verified by the circuit design/layout.
4.5.2 Output. To determine conformance to 3.3.2, the generator shall be stabilized at the
highest attainable frame temperature, not exceeding 165 F above ambient temperature, at
28.5 V. The generator shall be stabilized at this temperature, unless some factor other than
temperature, such as poor commutation, limits the performance at the particular point. To
determine conformance, at least six points shall be established on the performance curve,
including the following as applicable:
a. Cut-in speed. This speed shall be determined with no resistance in series with the
field.
b. Minimum speed at rated output. This speed shall be determined with no resistance in
series with the field.
c. Maximum operating speed. This shall be the maximum operating speed as shown on
figure 1. It shall be established by adjusting the field resistance.
d. Performance checkpoint.
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