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style computer power supplies. Connecting an ATX 20-pin or 24-pin connector to the MAIN POWER connector of this tester will …
ATX Computer Power Supply Tester
The Tenma Model 72-1086 ATX Power Supply Tester is designed to provide fast convenient verification of proper operation of ATX style computer power supplies. Connecting an ATX 20-pin or 24-pin connector to the MAIN POWER connector of this tester will provide immediate visual indication of operation of the power supply. An analog voltage meter is also included to verify correct voltage of all applicable pins on this connector, as well as the peripheral power, floppy drive power, +12V CPU and Serial ATA power connectors.
Typically, ATX style power supplies are switched on/off from the motherboard. The Tenma ATX Power Supply Tester simulates this command by pulling PIN-16 low (on the 24-pin connector), and placing an appropriate current load across Pin-4 and Pin-5. When the tester rocker switch is placed in the ON position, the power supplies cooling fan will engage and the LED indicator, located in the tester rocker switch, will light. This indicates that the power supply is functioning. In many situations, this level of pass/fail testing is all that is required. In circumstances where the supply is operational yet erratic behavior exists, it may be desirable to verify correct voltage at all pins. The DC panel meter, and 14-position and 15-position rotary switches allow easy verification of voltages at each of the MAIN POWER connections, as well as the SECONDARY power connectors, which are used to power external peripherals such as DVD/CD ROM, floppy and hard drives and Serial ATA devices. Many low cost computer power supplies have one internal circuit for each of 3.3V, 5V and 12V voltages. In this case, all outputs whether on the motherboard, the processor or a peripheral connector, of the same voltage, are internally tied tog