Instruction manual

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, configure jumpers as
shown in Figure 14.3f.
Figure 14.3f Jumper configuration for applying external voltage to sample
(for systems without the Basic Extender Module).
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
+
–
V
>10 MΩ
Tip
Indicates jumpers
External Voltage
Source
>10 MΩ
Ground
Analog 2
Gain Select
Auxiliary D
To AFM Tip
Unused
STM
Piezo Cap
(–)
(+)