
Electric Techniques
Surface Potential Detection—Preparation
300 Dimension 3100 Manual Rev. D
Analog 2 Voltage Applied to Sample (With Extender Electronics)
The jumper configuration in Figure 16.2l connects the Analog 2 signal from the NanoScope III
controller (± 12V range) to the sample. Remember to enable the Analog 2 voltage line as described
in Section 16.2.2.
Figure 16.5c Jumper Configuration for Application of Voltage to Sample
A current-limiting resistor (e.g., 10–100MΩ) should be placed in series with the external voltage
supply 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. Heat may cause damage and/or make jumpering the
pins difficult.
The sample should be electrically connected directly to the chuck or a standard sample puck using
conductive epoxy or silver paint as shown below:
Chuck Ground/Bias
Unused
Auxiliary 2 Output
Ground
STM Signal
Indicates Jumpers
Unused
Ground
Ground
AFM Tip
Sample Chuck
Analog 2 or
Gnd/OSC + DC signal
Sample
Tip
Analog 2
Sample Chuck
Sample
Conductive Epoxy
or Paint
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