Patent ID: 8803547
Filing Date: 2014-08-12
Classification: G01P

Abstract:
1. A method for testing rotation speed of a fan using a test board, wherein the test board is electrically connected to the fan, the method being executed by a processor of the test board, the method comprising: (a) receiving by the processor of the test board a signal representing a duty cycle ratio related to the fan from a dial switch on the test board, the duty cycle ratio being a ratio of a duration of a power-on state relative to a whole cycle of a pulse width modulation (PWM) signal; (b) transmitting the PWM signal comprising a duty cycle to the fan, to power rotation of the fan; (c) detecting the PWM signal transmitted to the fan and a tachometer (TACH) signal transmitted from the fan using the processor; (d) determining the duty cycle ratio related to the fan from the PWM signal and an actual rotation speed of the fan from the TACH signal; and (e) transmitting signals comprising the determined duty cycle ratio and the determined actual rotation speed to a display unit on the test board.