FAQ ?
Is the travel range dependent on temperature or pressure ?
• For the ANP positioners , rotators and goniometers it is not dependent on that . The scan range of the ANS scanners is however limited at lower temperatures .
Is the maximum load dependent on temperature or pressure ?
• Yes , at lower temperatures as well as in vacuum conditions the maximum load capacity is lowered ( compared to ambient conditions ).
What is the difference between the / HV and / UHV positioners ?
• For the / UHV positioners special UHV compatible ( i . e . not outgasing ) materials are used . Moreover , a test in a baked out UHV environment is performed for all UHV positioners to guarantee full functionality usually down to 5x10 -11 mbar .
What ’ s the maximum pressure and magnetic field ratings ?
• attocube / UHV-positioners are specified down to 5x10 -11 mbar and the maximum tested magnetic field is currently 35 T .
What is the temperature range for the positioners ? Are they bakeable ?
• There are different attocube ANP positioners specified from the mK range up to 373 K . All UHV positioners can be baked out up to 423 K .
Is the controller included with the purchase of a positioner ? What else do I need ?
• A motion controller is not included with the positioner . attocube sales engineers help you to find the suitable motion controller as well as cables . Moreover , there are different kinds of accessories like feedthroughs or thermal coupling devices .
What is meant with " open loop " and " closed loop "?
• The positioners without an encoder are driven in " open loop " - those positioners can only be driven forward or backward without an actual readout of the position . Whereas the positioners with an encoder are driven in " closed loop " mode , which means that a feedback loop is integrated into the control electronics and minimizes the difference between target position and actual position .
What is the difference between / RES and / RES +?
• Both encoders are based on a potentiometer . The / RES + encoder is explicitly for our / ULT positioners .
What ' s the meaning of " fine positioning mode "?
• The fine positioning mode is the " scan " -mode of our positioners . For that , a DC voltage can be applied to obtain sub-step-size resolution .
What ' s the thermal conductivity of the ATC ?
• It mostly depends on the type of link ( sheets or braids ) between the upper and lower plate and of the length of the link .
What is the difference between accuracy and precision ?
• Please refer to the glossary .