PZU-2000 Series XYZ Automated Stage with Piezo Z-axis Top Plate
The PZU-2000 XYZ stage has been specifically designed to provide a high resolution, and highly repeatable, means of controlling the X, Y, and Z position of the microscope stage. The XY axes derive their precise control through the use of closed-loop DC servomotors employing high-resolution rotary encoders for positioning feedback. By using closed-loop control for the stage position, there is no chance that the stage will become lost, as can occur with open-loop micro-stepped stages after a number of moves and direction changes. The XY stage utilizes crossed-roller slides, high-precision lead screws, and zero-backlash miniature geared DC servomotors for smooth and accurate motion. The top plate of the stage accepts standard K-size slide inserts that are available for any sample, i.e., slides, petri dishes, multi-well plates, etc. The slide insert is moved in the Z-axis via a piezo element with a range of 150 ÎĽm with nanometer accuracy (300 ÎĽm & 500 ÎĽm range is also available). By moving the sample in the Z-plane, any objective can be used, eliminating twisting wires or needed spacers as required when a piezo element is put onto a single objective. The microprocessor-controlled MS-2000 control unit provides for RS-232 and USB communication with a host computer for control of the XYZ axes.
PZU-2000 Features
- Closed-loop control of the X, Y and Z-axes for precise positioning and highly repeatable focusing.
- Wide dynamic speed range with adjustable trapezoidal move profiles.
- Smooth adjustable dual-range joystick control
- Backlit LCD display shows X, Y and Z coordinates
- “Zero” and “Home” button for simple stand-alone operations.
- Compact ergonomic tabletop control unit size is 6”D x 9”W x 3”H (9 x 23 x 16½ cm).
- Proven operation with many popular software packages.
PZU-2000 Options
- XY axes Linear Encoders for high-accuracy positioning. Linear encoder resolution is 10 nm, with a scale accuracy of 0.3 ÎĽm per 10 mm and 3 ÎĽm per 100 mm. Positioning resolution at sample is < 50 nm.
- Auto Focus (requires NTSC or PAL composite video signal).
- ASI’s proven line of Z-axis drives can also be added to the fine focus shaft of the microscope to provide Z-axis positioning with a resolution of 50 nm throughout the range of the microscope’s travel. The piezo unit can then be used for fast and accurate Z-axis positioning to any point within the range of travel.
- Other lead screw pitches are available for faster XY translation, or for more precise positioning when using standard rotary encoders.
ADEPT Piezo Controller Specifications
| Specification | PZ-2150 | PZ-2300 | PZ-2500 |
| Piezo Travel Range (+/- 5%) | 150 ÎĽm | 300 ÎĽm | 500 ÎĽm |
| Piezo smallest move / resolution* | 2.2 nm | 4.5 nm | 7.6 nm |
| Maximum Load for full range travel | 2Kg | 1Kg | 1Kg |
| Transient Response time** | 11 – 15 ms | ||
| External Analog input (BNC) | 0 to 10 Volts | ||
| Maximum Input Frequency | 20 Hz |
**Time taken to travel 10%-90% for moves below 30% travel range with 600 grams load.
*In external input mode, use of a higher bit DAC will increase resolution. For example a 0-10 analog voltage from the DAC results in the following:
| PZ-2150 | ||
| External Analog Input | Steps | Resolution |
| 16 Bit DAC | 65536 | 2.2 nm |
| 17 Bit DAC | 131075 | 1.1 nm |
| 18 Bit DAC | 262144 | 0.55 nm |
PZU-2000Â Specifications for Standard Configuration
| XY axis range of travel | 120 mm x 110 mm |
| XY axis resolution (encoder step) | 0.088 ÎĽm |
| XY axis lead screw accuracy | 0.25 ÎĽ/mm |
| XY axis RMS repeatability | < 0.7 ÎĽm |
| XY axis maximum velocity | 7 mm/sec |
| Z axis range of travel | 100 ÎĽm (175 ÎĽm version optional) |
| Z axis resolution | 1.5 nm |
| Z axis maximum velocity with settling time | 5 mm/sec (~ 10 ms per move) |
| Z axis resonant frequency (unloaded) | > 1 KHz |
| Z axis top plate maximum load | 500 grams |
| Z axis top plate stiffness (± 20%) | 3 N/μm |
| Z axis top plate in-plane tilt (typical) | 10 ÎĽrad |
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