System Effects on Accuracy and Repeatability - Changchun Rongde Optics Co.,Ltd.

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Changchun Rongde Optics
Co.,Ltd.
Add：No.1666 Yaan Road,
North Lake Development District,
Changchun 130102,China
Tel：86-431-81881745
Fax：86-0431-85256892
E-mail：rongdecui@roundss.net
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System Effects on Accuracy and Repeatability！

Changchun Rongde Optics Co.,Ltd. Release time：2016/10/12 Browse：743

System Accuracy: An encoder’s performance is typically stated as resolution rather than accuracy of measurement. The encoder may be able to resolve movement into precise bits very accurately, but the accuracy of each bit is limited by the quality of the machine motion being monitored. For example, if there are deflec tions of machine elements under load, or if there is a drive screw with 0.1 inch of play, using a 1000 count-per-turn encoder with an output reading to 0.001 inch will not improve the 0.1 inch tolerance on the

measurement. The encoder only reports position encoder; it cannot improve on the basic accuracy of the shaft motion from which the position is sensed.Note: Given a particular machine design, some errors in measuring motion such as mechanical backlash and errors in leadscrews or gearing systems, can be electronically compensated by some of the more advanced motion controllers.

System Repeatability: Repeatability is the tolerance to which the controlled

machine element can be repeatedly positioned to the same point in its travel.

Repeatability is generally less than system resolution, but somewhat better than system accuracy. 10,000 pulses per turn can be generated from a 2500 cycle, two channel encoder. Typically with a Roundss encoder, this 4× signal will be accurate to better than ±1 count

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