MIL-DTL-17060G(SH)
APPENDIX C
C.4.4.2 Temperature stabilization. The efficiency test shall be conducted after the heat run test. The motor
shall be operated at 100 percent of rated load until the winding temperature rise has stabilized as determined in the
heat run test. Verification of achieving rated temperature rise shall be by either a rise by resistance test or by
thermocouple. If verification is by thermocouple, the thermocouples shall be the same ones used in the heat run and
the thermocouple installation shall be unmodified from that of the heat run test. Temperature shall be stabilized
when either the rise by resistance or the rises by all thermocouples are within 37.4 °F (3 °C) of the values attained
during the heat run test.
C.4.4.3 Core loss and friction and windage loss. The core loss and friction and windage loss tests shall be
conducted immediately after the temperature test and at no-load.
C.4.4 Efficiency calculation. When calculating efficiency, the stator winding resistance shall be corrected to a
centigrade temperature equal to the rise by resistance at 100 percent load, as determined in the heat run test, plus
77 °F (25 °C). The 77 °F (25 °C) represents a standardized ambient temperature.
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