| Manufacturer's Description |
The 17 MPZ 001 modular piezoelectric controller is a singlechannel
closed-loop controller for use with the ultraprecision range
of active feedback actuators incorporated in various Melles Griot
nanopositioners. Because these actuators are fitted with zerotemperature-coefficient transducers, use of the controller enables
active position feedback control.
In the closed-loop mode, there is automatic compensation for
any small positional perturbations. Well-behaved positional control
is provided in a monotonic manner down to nanometric levels. The
controller utilizes an ultrasensitive position transducer to monitor
the exact extension of the piezoactuator and then generates an error
signal to close the position loop.
Piezoelectric hysteresis and creep are eliminated, and position
on demand is available at a low nanometric level, with the
piezoelectrics fulfilling their potential as the ultimate positioning
actuators.
The feedback system from the transducer attached to the
appropriate piezo is connected via a self-latching connector to the
front panel of the controller. When the position control switch is
switched on, the transducer control loop is closed, the position
control LED illuminates, and the voltage to the piezo will
automatically adjust to maintain the chosen extension. Alternatively,
the system will automatically track any changes in the applied
external or manual controls, ensuring that the piezo extension
changes linearly with the control voltages. Each axis can be zeroed
by the controller to align the zero of each transducer to the zero output voltage setting. |
| Specifications |
| Output Voltage | 0-75 VDC, SMC screw connectors |
| Input Drive Source | BNC 0-10 VDC inputs, SUMed or DIFFerenced with output from a 10-turn manual offsetting potentiometer |
| Output Protection | Thermal Trip |
| Voltage Stability | 100 ppm over 24 hours |
| Noise | < 3mV rms |
| Output Current | 0-500 mA per channel |
| Bandwidth | Open Loop: DC - 8.5 kHz
Closed Loop: DC - 1 kHz |
| Modes | Voltage and Position in µm: < 5 nm accuracy
< 5 nm repeatability |
| Feedback Socket | Lemo miniature 7-pin female |
| Dimensions (W x H x D) | 12 HP (61 mm)3U (134 mm) 220 mm |
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