E-662 Closed-Loop Piezo Servo Controller and Piezo Amplifier / Driver

36 W Peak Power
Position Servo Control
For Strain Gages & LVDT Sensors
RS-232 Computer Interface with 12-bit D/A Converter

E-662 is a bench-top, closed-loop feedback servo controller with integrated high voltage piezo driver / amplifier. It also has a digital RS-232 computer interface and 12 bit D/A converter and can operate piezo nanopositioning stages and actuators. The piezo voltage amplifier can output and sink a peak current of 360 mA and an average current of 120 mA. The closed-loop piezo servo controller works with either strain gage sensors (E-662.SR) or LVDT sensors (E-662.LR). E-662 can be operated in 6 ways.

I. Open loop (amplifier / driver mode)

Manual operation

Piezo driver output voltage can be set by a 10-turn, DC offset potentiometer in the range of 0 to 100 V.

External operation

Piezo driver output voltage is controlled by an analog signal applied to the BNC input ranging from -2 to +12 V. Multiplying by the gain factor of 10, an output voltage range of -20 to +120 V results. The DC offset potentiometer allows for a continuous variation of the input voltage range between -2 V to +12 V and -12 V to +2 V.

Computer Control (toggle switch selected)

Piezo driver voltage is controlled via the RS-232 computer interface in the range of 0 to 100 V with a resolution of 12 bits. The DC offset potentiometer and BNC analog input are inactive when in computer control mode.

II. Closed loop position feedback servo control mode

Manual operation

Displacement of the piezo nanopositioning stage or piezo mechanism can be set by a 10-turn, DC offset potentiometer in the range of zero to nominal displacement.

External control operation

Displacement of the Piezo stage or mechanism is controlled by an analog signal in the range of 0 to +10 V, applied to the BNC input. The controller is calibrated in such a way that 10 V corresponds with maximum nominal displacement and 0 V corresponds with 0 displacement. The DC offset potentiometer can be used to add an offset voltage of 0 to 10 V to the input signal.

Computer Control (toggle switch selected)

Displacement of the Piezo nanopositioning stage / piezo mechanism is controlled via the RS-232 computer interface in the range of 0 to maximum nominal displacement, with a resolution of 12 bits. The DC offset potentiometer and BNC analog input are inactive when in computer control mode.

More than 40 SCPI (Standard Commands for Programmable Instruments) ASCII commands are available to program the E-662. An internal function generator provides sine, square, ramp and triangular functions up to 150 Hz. User defined functions can be stored in a table with up to 200 entries. Minimum time between two samples is 1 msec.

ORDERING INFORMATION:
E-662.LR Piezo Amplifier/ Closed-Loop Piezo Servo Controller, LVDT, RS-232 Interface
E-662.SR Piezo Amplifier/ Closed-Loop Piezo Servo Controller, SGS, RS-232 Interface

TECHNICAL DATA: E-662
Function	Power amplifier & sensor/position servo control of PZTs
Channels	1
Amplifier
Maximum output power	36 W
Average output power	12 W
Peak output current < 5 ms	360 mA
Average output current > 5 ms	120 mA
Current limitation	short-circuit proof
Voltage gain	10 Â±0.1
Polarity	Positive
Control input voltage	-2 to +12 V
Output voltage	-20 to 120 V
DC offset setting	0 to 100 V with 10-turn pot.
Input impedance	100 kW
Display	2 x 3 1/2 digit, LED
Control input socket:	BNC
PZT voltage output socket	LEMO ERA.00.250.CTL
Dimensions	288x235x103 mm
Weight	2.5 kg
Operating voltage	90-120 / 220-240 VAC, 50-60 Hz (linear P/S)
Position Servo Control
Sensor Types	strain gages (E-662.SR); LVDTs (E-662.LR)
Servo Characteristics	P-I (analog) + notch filter
Sensor socket	LEMO ERA.0S.304.CLL
Sensor monitor output socket	BNC
D/A Converter & Computer Interface
Resolution	12 bit (=^ 2.5 mV input)
Computer interface	RS-232