THORLABS Kinesis PFM450E, Руководство пользователя

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Page 31 ETN018233-D03
PFM450E Piezo Focus Mount and Controller
5.2.2 Advanced tab.
Fig. 5.2 Piezo Settings panel - Advanced tab
IO Settings
Control Mode
- determines the input source(s) which control the output from the HV
amplifier circuit (i.e. the drive to the piezo actuators).
Software Only - the unit responds only to software inputs and the piezo drive
output is that set using the Software message calls (or the GUI panel ).
So External BNC - the unit sums the signal on the rear panel EXT IN BNC
connector with the voltage set using the software (or the GUI panel).
So Joystick - the unit sums the signal from the joystick control with the
voltage set using the software (or the GUI panel).
So Jo BNC - the unit sums all three signals.
Output Mode
- the EXT OUT BNC connector on the rear panel can be used to monitor
the piezo actuator on an external device, e.g. oscilloscope. This can be a useful
Caution
When driving the piezo mount from an external input source, the external signal
is summed with the software input (GUI panel or SetVoltOP software method)
and, if connected and selected, the Joystick.
In closed loop a smaller drive voltage than 150V is required to give 450 µm
travel. However, in open loop the drive voltage can be set from
-30 V to 150 V with a typical travel of over 600 µm. When using an external
source and switching from open loop to closed loop, care must be taken that
the travel range is not pushed to its limit. If closed loop is selected with
excessive drive voltages applied, the stage may jump position and/or drift.
If absolute positioning is required use closed loop mode only