如何测试同步

Test Name Synchronisation*
Settings Vo = Nominal, Io = 0A, Vin = Nominal (240Vac)
Method Measure frequency of Vo ripple. (Fvo)
Result Fvo
Pass criteria 200kHz <= Fvo <= 240kHz
*NOTE: Test jig PowerPac frequency must be 110kHz +/-10%.

请问 NOTE:Test jig PowerPac frequency must be 110kHz +/-10%. 什么意思？PowerPac是什么东西？

非常感谢！！