Instruction manual

Electric Force (EFM) Imaging
Electric Field Gradient Detection—Preparation
248 MultiMode SPM Instruction Manual Rev. B
Voltage Applied to the Sample
The jumper configuration in Figure 14.3d connects the Analog 2 signal from the NanoScope III
controller (± 12 VDC range) to the sample chuck.
Enabling the Analog 2 Voltage Line
The “Analog 2” voltage line is normally used by the NanoScope to control the attenuation (1x or
8x) of the main feedback signal. This application of EFM imaging uses the Analog 2 signal for
EFM data. Therefore, input attenuation must be disabled for the duration of the EFM experiments.
To do this, select di > Microscope Select > Edit > Advanced to display the Equipment dialog
box. Set Analog 2 to User-defined. Return to the main Feedback Controls panel; the Analog 2
field should now be enabled. This signifies that voltage is now being supplied via the “Analog 2”
pin located on the MultiMode baseplate header.
Remember to restore (Allow in attenuation) upon completion of EFM imaging.
Figure 14.3d Jumper configuration for application of voltage to sample
(for systems without the Basic Extender Module).
Sample
Tip
Analog 2
Ground
Analog 2
Gain Select
Auxiliary D (to NanoScope III controller)
To AFM Tip
Indicates jumpers
Analog 2
STM
Piezo Cap