The ACS 5000 variable speed drive system enables Boeing to run the fan in adjustable speed mode or at constant speed, depending on the protocols and parameters of each test.
ACS 5000变速驱动系统使得波音公司可以根据每个测试的规程和参数，自由设定可调速度模式或者恒速模式。
By using the "USB Bootload" mode, the system can on-line change and maintain the test software, achieve high facility and high expansibility.
本系统采用USB自举加载模式，能够在线修改与维护测试软件，增强了系统灵活性和扩展性。
Its main reason is that the power assumption of digital circuits in test mode is very higher than that in normal system operation mode.
在可测试性设计中考虑功耗的主要原因是数字电路在测试方式下的功耗比系统在正常工作方式下高很多。
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