Usually in testing in routine electric machine , fetch voltage , electric current , power , etc need be examined . we utilize the accurate operation function of the microcomputer to calculate power value , enable the circuit simplify notably , improve dependability accurate and therefore reduce the degree of difficulty of testing greatly 在常规的电机实验中常常要测取电压、电流、功率等，要准确地测出电压和电流的瞬时值，可以利用微型计算机的运算功能，准确地算出功率值，使电路显著简化，提高了可靠性，并大大降低了测试难度。
Supervisor point is behind the postposition of power amplifier , optic signals coming from a tap of 99 : 1 enter into optic spectrum scan module , then the power levels which have been calculated by iterative algorithmic are sent to power control module to guide a set of tunable electronic attenuators 此方案将监测点放在后置功率放大器的后面，从分束器中分出99 ： 1的光进入光频谱扫描模块，传给功率控制模块的光功率值经过选代算法后计算出均衡后的功率值送到功率控制模块的控制中心去调节电可调节衰减器。
Adopt advanced microprocessor carry out smart control and to the simultaneous inputed three phase ac voltage and current signal carry out accurate measurement , through cpu automatic count the three phase ac active power value , reactive power value , which is displayed clearly and visually by the high brilliance led digital tube or high resolution light column , uper screen display active power and down screen display reactive power , and can select serial communication function 采用先进的微处理器进行智能控制，对同时输入的三相交流电压与电流信号进行精确测量，经过cpu自动计算出三相交流有功功率值，无功功率值。上屏显示有功功率下屏显示无功功率，并可选择串行通讯功能。
At last the audio - visual filter can get and regroup the pcm audio data which transformed into the time - frequency signals by the fft . at the same time the power spectrum can be displaying on the windows by using the win32 api functions . finally the test of this system shows the processes about transport stream of receiving in the collecting card , pushing in the bridge , separating in the parser , displaying in the audio - visual filter are satisfied with the data rata at the server 音视频效果filter内部通过获取解码后的pcm格式数据,并利用缓冲管理器对这些数据进行重新分组,然后对分组后的数据进行fft变换将时域信号变换到频域之中,同时对变换后的数据作数学处理后得到其功率值,最后利用api画图函数对这些功率值进行了实时的特殊效果显示。
Intelligent three phase ac active reactive power instrument adopt advanced microprocessor carry out smart control and to the simultaneous inputed three phase ac voltage and current signal carry out accurate measurement , through cpu automatic count the three phase ac active power value , reactive power value , which is displayed clearly and visually by the high brilliance led digital tube or high resolution light column , uper screen display active power and down screen display reactive power , and can select serial communication function 智能三相交流有功无功功率仪表采用先进的微处理器进行智能控制，对同时输入的三相交流电压与电流信号进行精确测量，经过cpu自动计算出三相交流有功功率值，无功功率值，由高亮度led数码管或高分辨率光柱进行清晰直观的显示，上屏显示有功功率下屏显示无功功率，并可选择串行通讯功能。
