I am adding some new entries to the AFM FAQ. Here they are below. To get the answer to your question, contact me with the contact page.
Sandhya asks:Can you please tell me about feed back control. I found it difficult to understand Proportional control, gain and band
and integral gain. From your FAQ AFM, I understand that set point is force
applied on sample by tip.
A: This is a very common question when people start to use AFM. Most AFMs use a PI controller. This is a kind of simplified PID controller. To control the feedback circuits, you change the P and I values. P stands for proportional and I for Integral. However, commonly in the AFM software they are referred to simply as P and I. To understand what these really mean, look at PID controllers on wikipedia, or look at chapter 3. In some instruments, D (derivative) may also be available.
I am adding quizzes based on each chapter, to enable a self-test check after you've read it, or to help in using the book in a course.
There is a freely-downloadable
