
Electric Techniques
Electric Force Microscopy
284 Dimension 3100 Manual Rev. D
External Voltage Source Applied to Sample (No Extender Electronics)
In some cases, it may be advantageous to use voltages greater than 12 V, or to use a pulsed power
supply. If an external source of voltage is to be applied to the sample, configure jumpers as shown
in Figure 16.2i.
Figure 16.2i Jumper Configuration for Applying External Voltage to Sample
A current-limiting resistor (e.g., 10–100 MΩ) 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 difficult.
Sample Chuck Ground/Bias
Analog 2
Gain Select
Auxiliary D (to NanoScope III controller)
Ground
STM Signal (from Dimension head)
Indicates Jumpers
Unused
Ground
Ground
AFM Tip
Sample Chuck
(+)(-)
External Voltage
Source
>10 MΩ
Sample
–
V
Tip
+
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