５
MEASUREMENT OPERATION
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TMPM5200-2
the tip position; then press and hold down the left mouse
6.
Move the cursor to
button and drag it to the point where an I-V measurement is to be performed.
Measurement
position
Be careful not to drag the mouse cursor very fast because the cantilever is
actually moving in real time.
7.
After placing the “+” mark at the measurement point, press the right
mouse-button.
The I-V Parameters window will be displayed.
8.
Deselect Retract On by clicking on it.
Release the Retract On button for measurement.
9.
Specify the I-V measurement parameters according to the following proce-
dure.
a.
Specify the voltage range to perform the I-V measurement.
Here, as an example, we will explain how to set the I-V measurement range to –1.0
V to +1.0 V.
•
Double-click on the input box for Low Voltage/V and enter –1 using the key-
board.
•
Double-click on the input box for High Voltage/V and enter 1 using the keyboard.
ffset current is capacitance-corrected in such a way that
In this system, the o
when the input voltage is 0 V, the current is 0 nA. Therefore, the Low and High
Voltages must be entered so that they encompass 0 V.
b.
Click on the
button in the No to Average selection box and select 1 from
the pull-down menu.
This specifies the number of I-V measurements for data averaging. Increasing the
number of measurement is effective particularly when data is noisy or when a very
small current must be measured.
10.
Click on the Scan button.
The I-V measurement will start.
When you want to change the I-V display method, change it using the Plot parameters of
the Display menu after grabbing the data.
If the measurement position is changed with this method, the changed position
becomes the initial position. Therefore, when scanning has been finished or Abort
has been performed, the tip is at the initial position.
