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A rack receptacle loadbank testing system is disclosed for testing a power supply system in a data center from receptacles through a corresponding power distribution unit during both primary and secondary power source conditions. The testing system can include a portable loadbank cart and optionally

A rack receptacle loadbank testing system is disclosed for testing a power supply system in a data center from receptacles through a corresponding power distribution unit during both primary and secondary power source conditions. The testing system can include a portable loadbank cart and optionally one or more manual power source switches. The cart can include plural power cords that plug into plural rack receptacles at the same time, and includes a loadbank, a switch for coupling the loadbank to individual power cords, a power analyzer to detect high frequency voltage transients in the power circuitry, and a user interface to control the testing equipment. The power source switch is operable to switch between a first power source feeding the power distribution unit coupled to the rack receptacles, and a second power source feeding the power distribution unit.

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1. A testing system for loadbank testing of a power supply system in a data center, the power supply system including a power distribution unit and server rack receptacles being electrically coupled to the power distribution unit, the testing system comprising: a portable loadbank cart that includes

1. A testing system for loadbank testing of a power supply system in a data center, the power supply system including a power distribution unit and server rack receptacles being electrically coupled to the power distribution unit, the testing system comprising: a portable loadbank cart that includes: a frame adapted for portability within a data center;a loadbank supported by the frame;a plurality of power cords configured to attach to a corresponding number of the rack receptacles;a power cord selection switch electrically coupled to the loadbank and electrically coupled to each of the power cords, the power cord selection switch operable to electrically connect the loadbank to each of the power cords, one at a time, such that the loadbank is configured to draw power through a selected one of the power cords from a respective rack receptacle; anda power analyzer electrically coupled between the loadbank and the power cord selection switch, the power analyzer being operable to measure voltage of power flowing between the selected power cord and the loadbank to detect high frequency transients in the voltage;wherein the testing system is operable to loadbank test the data center power supply system from the rack receptacles through the power distribution unit, both when power is supplied to the power distribution unit from a first power source and when power is supplied to the power distribution unit from a second power source. 2. The testing system of claim 1, further comprising at least one manual power source switch that includes: a first power source input configured to be electrically coupled to the first power source;a second power source input configured to be electrically coupled to the second power source;a power output configured to be electrically coupled to the power distribution unit that supplies power to the rack receptacles coupled to the power cords; anda controller operable to switch between a first setting wherein the first power source input is electrically coupled to the power output and a second setting wherein the second power source input is electrically coupled to the power output. 3. The testing system of claim 2, wherein the at least one power source switch is configured to manually simulate functionality of an automatic transfer switch. 4. The testing system of claim 2, wherein the at least one power source switch is adapted to be temporarily attached to the data center power supply system during the loadbank testing, and then removed after the loadbank testing, such that the at least one power source switch is not included in the data center power supply system during normal operation of the data center. 5. The testing system of claim 1, wherein the portable loadbank cart comprises six or more power cords coupled to the power cord selection switch and operable to be coupled to six or more rack receptacles. 6. The testing system of claim 1, wherein the power analyzer is operable to record or store data corresponding the measured voltage. 7. The testing system of claim 1, wherein the testing system is operable to successively loadbank test a plurality of rack receptacles without unplugging any of the power cords from any rack receptacles. 8. The testing system of claim 1, wherein the power cord selection switch can be set such that none of the power cords is electrically coupled to the loadbank. 9. The testing system of claim 1, wherein the portable loadbank cart includes a user interface that comprises a control for the power cord selection switch, a control for the loadbank, and a display of the power analyzer. 10. A method for loadbank testing rack receptacles in a data center, the method comprising: coupling a plurality of power cords from a loadbank cart to a respective plurality of rack receptacles in a data center;setting the loadbank cart to draw power from a first rack receptacle of the plurality of rack receptacles through a first of the plurality of power cords;setting a power source switch to supply power from a first power source for the data center to a power distribution unit, which supplies power to the plurality of rack receptacles;analyzing power drawn by the loadbank cart from the first power source through the first rack receptacle to detect high frequency transients in the voltage of the drawn power;adjusting the power source switch to supply power from a second power source for the data center to the power distribution unit and the plurality of rack receptacles;analyzing power drawn by the loadbank cart from the second power source through the first rack receptacle to detect high frequency transients in the voltage of the drawn power;adjusting the loadbank cart to draw power from a second rack receptacle of the plurality of rack receptacles through a second of the plurality of power cords;analyzing power drawn by the loadbank cart from the first power source through the second rack receptacle to detect high frequency transients in the voltage of the drawn power; andanalyzing power drawn by the loadbank cart from the second power source through the second rack receptacle to detect high frequency transients in the voltage of the drawn power. 11. The method of claim 10, wherein the power source switch is a manual power source switch, and the method further comprises coupling the manual power source switch to the first and second power sources for the data center and to the power distribution unit to simulate the functionality of an automatic transfer switch. 12. The method of claim 11, further comprising decoupling the manual power source switch from the power distribution unit and re-coupling the manual power source switch to another power distribution unit to loadbank test another group of rack receptacles fed by the another power distribution unit. 13. The method of claim 10, further comprising recording or storing data corresponding to voltages measured by the power analyzer. 14. The method of claim 10, wherein the plurality of power cords remain coupled to the respective rack receptacles while both the first and second rack receptacles are loadbank tested. 15. The method of claim 10, wherein analyzing power drawn by the loadbank cart from the first power source through the first rack receptacle comprises applying a power load that simulates a power load drawn by a server rack. 16. The method of claim 10, wherein analyzing power drawn by the loadbank cart from the first power source through the first rack receptacle comprises monitoring high frequency transients in the voltage while viewing a display on a user interface of the loadbank cart. 17. A portable loadbank tester for loadbank testing a power supply system in a data center, the data center power supply system including a power distribution unit and server rack receptacles electrically coupled to the power distribution unit, the portable loadbank tester comprising: a loadbank;a plurality of power cords configured attach to a corresponding number of the rack receptacles;a power cord selection switch electrically coupled to the loadbank and electrically coupled to each of the power cords, the power cord selection switch operable to electrically connect the loadbank to each of the power cords, one at a time, such that the loadbank is operable to sequentially draw power through each of the plurality of power cords from the respective rack receptacles; anda power analyzer electrically coupled between the loadbank and the power cord selection switch, the power analyzer being operable to measure voltage of power flowing between the selected power cord and the loadbank to detect high frequency transients in the voltage;wherein the portable loadbank tester is operable to loadbank test the data center power supply system from the rack receptacles through the power distribution unit; andwherein the portable loadbank tester is operable to successively loadbank test a plurality of rack receptacles in sequence while each of the plurality of power cords remain attached to the respective rack receptacles. 18. The testing system of claim 17, wherein the portable loadbank tester comprises six or more power cords coupled to the power cord selection switch and operable to be coupled to six or more respective rack receptacles at the same time. 19. The testing system of claim 17, wherein the power analyzer is operable to record or store data corresponding to the measured voltage. 20. The testing system of claim 17, wherein the power cord selection switch is operable to be set such that none of the power cords are electrically coupled to the loadbank.