A-A-50599
6. Thermal Overload Protector Test. Place a rod in between the impeller blades to prevent the impeller from rotating. Start the portable fan at 115 volts. Measure the time needed for the thermal overload protector to stop the current to the fan and the time needed for the fan to restart. If the thermal overload protector fails to operate properly, then it constitutes a failure of this test.
7. Resistance Test. The fan shall not be in physical or electrical contact with any electrical ground. Insert the fan’s electrical plug into a dummy three prong receptacle. Measure the resistance between the dummy receptacle ground and each exposed metal part of the fan. Ensure that the resistance does not change while the fan’s electrical cord is being twisted or bent. Remove the fan’s plug from the dummy receptacle and position the fan’s switch to the opposition. Measure the resistance between each of the fan’s electrical plug line contacts to each exposed metal part of the fan. A multimeter is recommended for measuring these circuit resistances.
8. Drop Test. Perform drop test on the portable fan. “The portable fan shall be resting on its feet on a steel plate as described in paragraph 2. The portable fan shall then be raised to a vertical distance of at least two feet above the steel plate and then shall be dropped four times on each side as follows:
a. normal position (resting on its feet)
b. right side (90 degrees from normal position)
c. top (opposite of feet)
d. left side (opposite of right side)
e. ventilation discharge end I
f. ventilation suction end
After each side is completed, the portable fan shall be inspected for broken or loose parts or casing damage. At the end of the test, the portable fan shall be operated for five minutes. There shall be no noticeable difference in the fan operation when compared to the operation before the test. A noticeable difference in the fan operation would include areas such as a new noise, impeller wheel not moving freely, change in fan speed, or additional time needed for the fan to attain full operating speed.
c. Each completed production unit fan shall be tested to ensure it meets the electrical circuit resistance to ground, grounding circuit resistance to ground, inrush current, and running current requirements. The fan shall be operated for at least one minute after the above tests have been completed.
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