科研试验常用仪器，5209锁相放大器编程手册，可以用该手册对5209锁相放大器变成，非常实用。-Scientific research and test commonly used instruments, programming manuals 5209 lock-in amplifier, you can use the manual to the 5209 lock-in amplifier becomes very useful.

基于matlab的锁相放大例程，稍加修改，即可实现功能-Matlab based on the lock-in amplifier routines, slightly modified, you can achieve the function

锁定放大器是利用相关技术从噪声中提取微弱信号的常用方法之一。可以证明，当信号的频率和相位已知时，使用相关检测技术能使输出信号信噪比最大。数字锁定放大器比模拟锁定放大器具有稳定、精度高等优点，并且数字滤波器的通带可以设置的非常窄，以便滤除噪声。-Lock-in amplifier is a common method using correlation techniques extracting weak signals the noise in. It can be shown when th