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Notes (Technical Data)
A2 Open loop tilt angle @ 0 to 100 V
Typical open loop tilt angle at 0 to 100 V operating voltage. For differential drive tilt platforms 0 ° is reached at 50 V drive voltage, the maximum negative angle at 0 V and the maximum positive angle at 100 V. Max. operating voltage range is -20 to +120 V, short term only. For details see Lifetime of Piezos in "Tutorial: Piezoelectrics in Positioning" section.A3 Closed loop travel
Tilt provided in closed loop operation. For differential drive tilt platforms tilt is specified in + / - range around 0 °. PI LVPZT amplifiers have an output voltage range of -20 to +120 V to provide enough margin for the controller to compensate for load changes etc.A5 Open loop linear travel @ 0 to 100 V
Typical open loop travel at 0 to 100 V operating voltage. Max. operating voltage range is -20 to +120 V, short term only. For details see Lifetime of PZTs in "Tutorial: Piezoelectrics in Positioning" section.A6 Closed loop linear travel
Travel provided in closed loop operation. PI LVPZT amplifiers have an output voltage range of -20 to +120 V to provide enough margin for the controller to compensate for load changes etc.B Integrated feedback sensor
Absolute measuring SG (Strain Gage) and LVDT (inductive) sensors are used to provide position information to the controller. For details see High Resolution Sensors, click here, in "Tutorial: Piezoelectrics in Positioning" section.C1 Closed / open loop resolution
Resolution of Piezo Tilt Platforms is basically infinite because it is not limited by stiction and friction. Instead of resolution, the noise equivalent motion is specified. Values are typical results (RMS, 1 s), measured with E-503 amplifier module in E-500/501 chassis.C3 Full range repeatability (typ.)
Typical values in closed loop mode. Repeatability is a percentage of the total angle traveled. For small ranges, repeatability is significantly better.D1 Stiffness
Static large signal stiffness of the Piezo ceramic at room temperature and 0 V applied to the Piezo actuators. Small signal stiffness and dynamic stiffness may differ because of effects caused by the active nature of piezo material, compound effects, etc. Further details see "Tutorial: Piezoelectrics in Positioning" section, click hereF1 Electrical capacitance
The Piezo capacitance values indicated in the technical data tables are small signal values (measured at 1 V, 1000 Hz, 20° C, no load; large signal values at room temperature: 30 to 50% up). The capacitance of Piezo ceramics changes with amplitude, temperature, and load, up to 200% of the unloaded, small signal capacitance at room temperature. For detailed information on power requirements, refer to the amplifier frequency response graphs in the "Piezo Control Electronics" section of this catalog.F2 Dynamic operating current coefficient (DOCC)
Average electrical current (supplied by the amplifier) required to drive a piezo actuator per unit frequency and unit displacement (sine wave operation). E.g. to find out if a selected amplifier can drive a given Piezo Tilt Platform at 50 Hz with 300 µrad amplitude, multiply DOC coefficient by 50 and 300 and check if the result is smaller or equal to the output current of the selected amplifier. For details see Dynamic Operation (Analog) in "Tutorial: Piezoelectrics in Positioning" section.G2 Unloaded resonant frequency (f0)
First tilt resonant frequency around active axis without mirror attached to platform (does not specify the maximum operating frequency). For further details see Resonant Frequency in "Tutorial: Piezoelectrics in Positioning" section.G3 Resonant frequency with Æ a, x b mm mirror
Example on how a load (mirror) attached to the platform affects the resonant frequency (calculated data). See "Dynamic Behavior" on page 3.5 for further details.H2 Operating temperature range
Standard range, other temperature ranges on request. Closed Loop Systems are calibrated for optimum performance at room temperature. Recalibration is recommended if operation is at a significantly higher or lower temperature.J1 Voltage connection
Typical operating voltage connectors are LEMO type connectors.VL (Voltage Low): LEMO FFS.00.250, male. Cable: coaxial, RG 178, Teflon coated, 1m.
For extension cables and adapters, see "Accessories" at the end of "Piezo Control Electronics" section.
J2 Sensor connection
Typical sensor connectors are LEMO type connectors.L: L: LEMO FFA.0S.304, female.
Cable: PUR, 1m.
For extension cables and adapters, see "Accessories" at the end of "Piezo Control Electronics" section.
L Material (case / platform)
Small amounts of other materials can be used internally for spring preload, piezo coupling, mounting, etc.Al: Aluminum.
N-S non magnetic stainless steel
S: ferromagnetic stainless steel
I: InvarM Recommended Amplifier/Controller
See reference list at the end of "Piezo Control Electronics" section.
