ELL18K Rotation Stage Evaluation Kit
Chapter 4: Operation
Page 6
DTN000524-D02
Chapter 4 Operation
4.1. Getting Started
Caution
Although the module can tolerate up to 8kV of air discharge, it must be treated as ESD sensitive device. When
handling the device, anti-static precautions must be taken and suitable anti-discharge appliances must be worn.
Do not expose the stage to magnetic fields as this could affect the positioning and homing sensor operation.
When power is applied, do not connect or disconnect the ribbon cable connecting the handset to the stage PCB.
Always remove power before making connections.
Warning
If the device is operated over a prolonged time period, the motor housing may become hot. This does not affect
motor operation but may cause discomfort if contacted by exposed skin.
1. Perform the mechanical installation as detailed in Section 3.2
2. Connect the handset to the stage if required.
Caution
The unit is easily damaged by connections with incorrect polarity. Pin 1 of the connector on the PCB is marked
with an arrow (see Figure 4 and Figure 5.) which should be adjacent to the red wire in the connecting cable.
3. Connect the stage to a 5V supply and switch ‘ON’. (A 5V PSU is supplied with the ELL18K/M).
4. Connect the unit to your PC if required, and wait for the drivers to be installed.
5. Home the stage. Homing is necessary to align the sensor and establish a datum from which all future
moves are measured.
4.1.1. Homing
Homing is achieved using a combination of a reflecting optical sensor (IR) for coarse (0.5 to 1.0 mm) positioning,
then a magnetic sensor for fine (1.0 µm resolution) positioning (the magnetic sensor is also used for positioning
during subsequent moves). Using the ELLO software, the user can modify the offset value to shift the homing
position (up to a ¼ of turn). Furthermore, coarse homing can be selected in a clockwise or counter clockwise
direction (the switch between coarse to fine homing is always performed in the same direction to guarantee
repeatability).
4.1.2. Position Error Compensation
The stage has a positioning error compensation algorithm. When moving from one position to another, the stage
detects the error between the requested and actual positions and will calculate an error compensation value,
which is then applied to the next movement. The calculation is applied automatically and is continually updated,
but generally the optimum value is calculated within 2 to 6 motions.
Содержание ELL18
Страница 1: ...ELL18 and ELL18K Rotation Stage Kit Operating Manual Original Instructions...
Страница 23: ...www thorlabs com...