Electric Force (EFM) Imaging
Electric Field Gradient Detection—Preparation
Rev. B
MultiMode SPM Instruction Manual
253
Voltage Applied to the Sample
The jumper con
fi
guration in
connects the Analog 2 signal from the NanoScope III
controller (± 12 VDC range) to the sample.
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-de
fi
ned
. Return to the main
Feedback Controls
panel; the
Analog 2
fi
eld should now be enabled. This signi
fi
es that voltage is now being supplied via the “Analog 2”
pin located on the baseplate header.
Remember to restore (
Allow in attenuation
) upon completion of EFM imaging.
Figure 14.3i
Jumper con
fi
guration for application of voltage to sample
(for systems
with
the Basic Extender Module).
Sample
Tip
Analog 2
Ground
Analog 2
Unused
Auxiliary D (to NanoScope III controller)
To AFM Tip
Indicates jumpers
Analog 2
STM
Piezo Cap
