Abstract: A server includes a chassis, a motherboard, a number of data storage devices, a number of system fans, and a power supply mounted in the chassis. The system fans generate an airflow flowing through the chassis, from a front portion of the chassis to a rear portion of the chassis. The power supply includes a power fan causing an airflow directed rearwards through the front portion of the chassis to prevent a disturbance with the airflow from the system fans.

Abstract: A fan rotation speed test device for testing rotation speed of a plurality of fans, includes a plurality of connectors, a display, a display control switch, and a single chip microcomputer (SCM). Each connector is connected to a corresponding fan, to output pulse signals in response to rotation of the corresponding fan. The SCM is electronically connected to the connectors, the display, and the display control switch. The SCM receives the pulse signals from the plurality of connectors, calculates and stores the rotation speed of each fan, and displays the rotation speed of one of the fans on the display at each close of the display control switch.

Abstract: A server includes a chassis, a motherboard, a number of data storage devices, a number of system fans, and a power supply mounted in the chassis. The system fans generate an airflow flowing through the chassis, from a front portion of the chassis to a rear portion of the chassis. The power supply includes a power fan causing an airflow directed rearwards through the front portion of the chassis to prevent a disturbance with the airflow from the system fans.

Abstract: A system is used to measure a fan rotational speed. The system includes a main controller, a first socket coupled to the linear fan, a second socket connected to the main controller, and an optical fiber amplifier connected to the main controller. A PWM (pulse width module) fan is coupled to the second socket, the PWM fan sends a first rotational speed signal, which represent a rotation speed of the PWM fan, to the main controller via the second socket. The optical fiber amplifier is capable of radiating light on fan blades of the linear fan, and sensing light reflected by the fan blades to count a rotational speed of the linear fan, and generating a second rotational speed signal which represents a rotational speed of the linear fan. The optical fiber amplifier sends the second rotational speed signal to the main controller.

Abstract: A system is used to measure a fan rotational speed. The system includes a main controller, a first socket coupled to the linear fan, a second socket connected to the main controller, and an optical fiber amplifier connected to the main controller. A PWM (pulse width module) fan is coupled to the second socket, the PWM fan sends a first rotational speed signal, which represent a rotation speed of the PWM fan, to the main controller via the second socket. The optical fiber amplifier is capable of radiating light on fan blades of the linear fan, and sensing light reflected by the fan blades to count a rotational speed of the linear fan, and generating a second rotational speed signal which represents a rotational speed of the linear fan. The optical fiber amplifier sends the second rotational speed signal to the main controller.

Abstract: A testing system for a power supply (40) includes a testing chamber (10), a control switch, an electrical load (50), an AC source (60), and a PLC (30). The power supply has a voltage choice switch. The testing chamber receives the power supply therein. The testing chamber provides a first or a second ambient temperature and supplies a testing environment for the power supply. The control switch switches the power supply to operate between a standby state and an operational state. The electrical load is connected to the power supply. The AC source is connected to the power supply. The AC source outputs the first voltage or the second voltage to the power supply. The PLC controls switching states of the voltage choice switch and the control switch in a manner such that the power supply selectively operates in one of combined switching states of the voltage choice switch and the control switch.

Abstract: A testing system for a power supply (40) includes a testing chamber (10), a control switch, an electrical load (50), an AC source (60), and a PLC (30). The power supply has a voltage choice switch. The testing chamber receives the power supply therein. The testing chamber provides a first or a second ambient temperature and supplies a testing environment for the power supply. The control switch switches the power supply to operate between a standby state and an operational state. The electrical load is connected to the power supply. The AC source is connected to the power supply. The AC source outputs the first voltage or the second voltage to the power supply. The PLC controls switching states of the voltage choice switch and the control switch in a manner such that the power supply selectively operates in one of combined switching states of the voltage choice switch and the control switch.