The system can generate sweep frequency signal with frequency range from 100khz to 150mhz and power range from - 40dbm to + 18dbm , and measure the gain and phase of the crystal . according to the gain and phase information and the iec - 444 standard , crystal parameters can be calculated , such as nominal frequency , series resistance , shunt capacitance , motion capacitance , motion inductance , q factor and so on 该系统能产生频率范围达100khz 150mhz ，功率范围为? 40dbm + 18dbm的扫频信号，并能对晶振的增益和相位差进行测量，其测量结果按照iec - 444晶振测量标准进行实时处理和计算，从而得到晶振的串联谐振频率、并联谐振频率、等效电阻、静态电容、动态电容、动态电感和品质因数等主要电参数。
In the paper , the design of the real - time test system for crystal parameters is presented . the signal generator of sweep frequency based on dds device ad9852 , the signal measuring circuit based on gain and phase detector ad8302 , and the real - time control and deal circuit based on tms320vc5416 and the design of high - speed printed digital & analog circuit board are discussed in details 本文阐述了晶振实时测量系统的设计，介绍了以dds芯片ad9852为核心的扫频信号源电路，以增益相位检测器ad8302为核心的信号检测电路，以dsp芯片tms320vc5416为核心的实时控制与运算电路，以及高速数模混合电路板的设计方法。
In the design of hardware , frequency sweep signal is based on dds + pll . by the control the singlechip c8051f060 , ad9852 , the dds chip , can achieve stepped frequency signal . with amplifying and detector circuits , the instrument can achieve the measurement and receiving of amplitude frequency characteristic result . by means of pdiusbd12 finish the usb1 . 1 protocol conversion , communicate with usb interface of pc , the instrument give the measurement resul of amplitude - frequency characteristic in lcd of pc 硬件方面,扫频信号源基于dds + pll的技术,由c8051f060单片机控制dds芯片ad9852实现频率步进。再加上外围放大、检波等电路,测量和接收幅频特性。并借助于pdiusbd12完成测量数据usb1 . 1协议转换,实现与pc机的usb接口通信,将幅频特性测量结果在pc机的液晶显示屏上表达出来。
By using single - chip microcomputer c8051f060 and dds ad9852 , the instrument is easy to measure the transport characteristic of the high frequency tuner . by using c8051f060 to control dds chip ad9852 , a signal with high resolution , high transferring speed and pure spectrum is obtained . the output frequency range is up to 1000mhz . the system can give the frequency characteristic drawing of the high frequency tuner by connecting pc with usb 采用cygnal公司的专利cip51微处理器内核的c8051f060单片机作为控制器,使用锁相环+直接数字合成+下变频的方法构成扫频信号源,用直接数字频率合成( dds )芯片ad9852实现扫频信号的控制,产生测量用的扫频信号的范围为1 ~ 1000mhz 。
We equip the following machines for the environmental testing and the reliability test : test box with high and low temperature , test box with high temperature , test box with invariableness temperature and humidity , salt - spray test box , vibrant and impactive test machine , tensile test machine , frequency tester and scanner , oscillograph , oven with invariableness temperature etc . pic the 3d machine 环境试验可靠性测试等方面配置有以下仪器设备：高低温试验箱高温恒温试验箱恒定湿热试验箱盐雾腐蚀箱振动冲击试验台拉力试验机谐振频率f0快速测试仪扬声器f0快速测试仪音频扫频信号发生器示波器电热恒温干燥箱等。
