TI中文支持网请教专家：
我现在手上有一个线圈，但没有阻抗分析仪，怎么样才能测得到此线圈Rp_max、Rp_min和谐振频率？视频中测量这三个参数时，也需要和LDC模块连接起来吗？谢谢!
Nick Dai：
Hi Sally,
Impedance analyzer is not required, it just provides a more scientific way of tuning Rp min/max values for optimal performance.
You should connect LC circuit with LDC use an empirical way of Rp tuning:
1) Set Rpmin to 3F, RpMAX to 0.2) Expose the coil to the maximum metal coverage for your application (closest target position, thickest part etc)3) Start reducing RpMIN setting 1 code at a time, and take Rp Measurements (they will go up with each change).4) When Rp gets in the range of 20,000 – 30,000 codes, that is your optimal RpMIN setting.5) Move your target to a position where it's exposed the least (farthest position, thinnest part) etc.6) Start increasing RpMAX setting 1 code at a time, and take Rp Measurements (they will go down with each change).7) When Rp gets in the range of 2,000 – 3,000 codes, OR the difference between RpMIN and RpMAX values reaches x25 – x26, that is your optimal RpMAX setting. It may get too noisy, then back off 1-2 RpMAX codes.P.S To speed up tuning, you may change the codes by more than 1 code at a time, for example – binary search etc.
shan dong：
回复 Nick Dai:
Nick Dail 你好，我现在想把处理器换成TMS320F28062，但是在编程时我发现对Rp_MAX寄存器无法设置参数，而且每次读出来的频率值都是不一样的，这是怎么回事呀？
