Electric Force (EFM) Imaging
Electric Field Gradient Detection—Preparation
250
MultiMode SPM Instruction Manual
Rev. B
External Voltage Source Applied to the Sample
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 sample, con
fi
gure jumpers as
shown in
.
Figure 14.3f
Jumper con
fi
guration for applying external voltage to sample
(for systems
without
the Basic Extender Module).
A current-limiting resistor (e.g., 10–100 M
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.
Sample
+
–
V
>10 M
Ω
Tip
Indicates jumpers
External Voltage
Source
>10 M
Ω
Ground
Analog 2
Gain Select
Auxiliary D
To AFM Tip
Unused
STM
Piezo Cap
(–)
(+)
