Electric Force (EFM) Imaging
Electric Field Gradient Detection—Preparation
Rev. B
MultiMode SPM Instruction Manual
249
External Voltage Source Applied to the Tip
In some cases, it may be advantageous to use voltages greater than 12 VDC, or to use a pulsed
power supply. If an external source of voltage is to be applied to the tip, con
fi
gure jumpers as
shown in
Note:
In all con
fi
gurations which apply voltage to the tip, an E-
fi
eld cantilever holder
is required. Contact Veeco for more information.
Figure 14.3e
Jumper con
fi
guration for applying external voltage to tip
(for systems
without
the Basic Extender Module).
A current-limiting resistor (e.g., 10–100M
Ω
) should be placed in series with the external voltage
supply as shown to protect the tip and sample from damage. Current-limited power supplies may
also be used. Voltage leads should be connected to pins on the header using soldered, push-on
connectors.
Do not
solder leads directly to the header pins, as the heat may cause damage and/or
make jumpering the pins dif
fi
cult. The connection to ground can be made to the AFM chassis or
externally.
Sample
Tip
+
–
V
Ground
Analog 2
Gain Select
Auxiliary D (to NanoScope III controller)
To AFM Tip
Indicates jumpers
Unused
STM
Piezo Cap
(-)
(+)
External Voltage
Source
>10 MW
