AMO's proven and original technology for length and angle measurements uses techniques for scanning high precision graduations consisting of structures photo-lithographically etched onto steel. Based on this, inductive sensors and integrated evaluation electronics (in ASIC) have been developed further, to create a new and powerful generation of measuring systems. ® The AMOSIN angle measuring systems are open hollow-shaft measuring systems, and generally therefore do not have their own bearings, nor do they require any couplings for mechanical connection. ® Operating entirely on an inductive basis, the AMOSIN systems achieve high precision figures as close as +/- 5 µm arc length, but are nevertheless ver y well able to resist environmental influences such as dust, humidity and so forth, and also feature extremely high resistance to shock and vibration. The high precision is mainly due to the procedure used to manufacture the rigid steel measuring ring, and to the exceptionally high quality sensor signal, with deviations in the sine wave down to < 0.1 % harmonic content, as a measure of the achievable interpolation precision within the grating pitch.