The Nanoscale World

Kelvin Probe: ´Potential´signal is alternating.

rated by 0 users
Not Answered This post has 0 verified answers | 1 Reply | 2 Followers

Top 25 Contributor
58 Posts
Points 652
stsolong posted on Tue, Jul 10 2012 4:23 AM

Hi Friends,

I found the signal of ´potential´ is alternating while I increases the lift distance or drive phase.

For example, I measured the surface potential difference on the edge of Pt coating and isolator. I set the ´drive amplitude´ 1800mv, ´drive phase´ 105° and lift distance 150 nm. When I changed the lift distance to 200nm (other parameters kept constant), the data center of  ´potential´ shifted from 5V to -5V, and then back to 5V, -5V, 5V...

This happened as well when I only increased the ´drive phase´ 5° upper (other parameters kept constant).

What is the reason for this phenomenon?

Any reply will be appreciated.


  • | Post Points: 12

All Replies

Top 25 Contributor
55 Posts
Points 831
Bruker Employee

Hello Solong,

The potential value may change somewhat with lift heihgt, but should not jump/alternate at all. It is likely the phase is not set properly in the first place.

Please set the phase per the procedure outlined in a previous post, I expect the problem to go away.


Application Scientist

  • | Post Points: 10
Page 1 of 1 (2 items) | RSS
Copyright (c) 2011 Bruker Instruments