THORLABS Kinesis PFM450E, Руководство пользователя

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Rev E Mar 2022
Page 24
Chapter 4 PC Operation - Tutorial
4.6 Moving the Piezo Mount
The piezo mount can be manually positioned in two ways: by entering a voltage/
position, or by clicking the ‘Jog’ buttons.
4.6.1 Setting the Zero Position
Upon power up, the controller is set to 0V and open loop. Typical operation involves
moving to a position visually in open loop and then switching to closed loop, which
maintains the stage position to that achieved at the moment of switch over. Due to
factors such as objective mass, piezo mount orientation, and environmental
temperature, the position of the mount with 0V applied can vary by tens of microns.
Therefore a true position of 0 µm (or a required offset positiuon value) must be set
before the position attained by a specific applied voltage and the position attained by
a corresponding specified distance can be rationalized. This is particularly important
when operating in open loop via the GUI Output control to find an area of interest, and
then switching to closed loop and exploring this area using an external voltage
source.
To adjust the zero position:
1) Ensure that any external signal (External BNC input or joystick) is set to 0V, then
in the GUI panel, select ‘Closed Loop’ mode.
2) Move the stage to 0 µm as detailed in Section 4.6.2.
4.6.2 Entering the piezo position
1) Click the ‘Closed Loop’ button.
2) Click the ‘Position’ button in the Main
Display..
3) Click the Set Arrow to display the Target window..
4) Enter a position, e.g. 10.00. This can be entered directly into the field, or by
clicking on the up/down arrows.
Note
The piezo position can be entered only when operating in ‘Closed Loop’ mode.