I have been using DI 3100 with nanoscope controller III for TPE phase imaging. Recently, I have started using Dimension V with Nanoscope V. I am having problem in getting phase image contrast in TPE system with Dimension V. I am using TESP with 10% offset frequency and setpoint ratio of .2-.5. The taget amplitude in DI V is 500 mV whereas in DI 3100