FAQ?
What is the difference between the ANP series and the ECS series?
• The ECS series is a dedicated industrial series which is bearing based, cost efficient and convinces with a rugged design and high load capacities. The ECS / RT models are made out of aluminum and the ECS /( U) HV out of stainless steel. The ANP series is more research focused with smaller footprints and a nonmagnetic positioner body out of titanium.
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 / NUM or / RES encoder are driven in " closed loop " mode, which means that a feedback loop integrated into the control electronics minimizes the difference between target position and actual position.
What is the difference between NUM and NUM +?
• The NUM + encoder features a reduced thermal dissipation of only 50 mW making it especially suited for / HV and / UHV positioners. The necessary amplifier has been detached from the sensor itself and placed in the connector of the cable outside of the vacuum chamber.
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’ s sales engineers help you to find the suitable motion controller as well as cables. Moreover, there are different kinds of accessories like feedthroughs or adapter plates.
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 5 x 10-11 mbar. Please note, our ECS series rotators and goniometers are specified for 1 x 10-9 mbar due to a special UHV compatible grease.
What is the temperature range for the positioners? Are they bakeable?
• All attocube open loop positioners and all closed loop positioners of the ANP series(/ RES & / RES +) are specified from 0 ° C to 100 ° C( dedicated low temperature positioners are specified down to the mK range). ECS positioners with a / NUM encoder work up to a temperature of 50 ° C(/ NUM + up to 55 ° C). All UHV positioners can be baked out up to 150 ° C.
What is the load capacity in a specific environment or mounting direction?
• All positioners are specified at ambient conditions. For specific requests please contact attocube’ s sales engineers.
There is only limited space available for my setup, are there positioners with a comparatively small footprint?
• Yes, the ANP series positioners all have a relatively small footprint starting at 15 x 15 mm.
What is the difference between accuracy and repeatability?
• Please refer to the glossary.