Terminology glossary
Resolution
The measurement resolution is the smallest increment of displacement that the sensor can show .
Accuracy
Accuracy is the deviation of a device ' s measured displacement value compared to the true displacement of the target . Accuracy is defined as a percentage of the measured range .
Repeatability
Repeatability is the standard deviation ( σ ) of a set of a device ' s moving target approach measurements , all made under the same conditions . Approach measurements may be done from one or both sides of a target , specifying a devices uni- or bi-directional repeatability respectively .
Precision
The precision is the standard deviation ( σ ) of a measurement . Its value is strongly related to the system ’ s noise level , its repeatability and – over duration – its stability . accuracy measurement value true value repeatability
Figure 1 : Difference between measurement accuracy ( trueness ) and measurement repeatability .
Combining Goniometers
Each size of goniometer is available in two versions which are usually used as a pair for theta ( Θ ) and phi ( Φ ) motion . The Θ positioner mounted on top of the Φ positioner forms a tip-tilt stage with a common center of rotation . Mounting is done directly via two or four screws .
Combinations with other positioners are explained above respectively in the accessories sections on our webpage .
Center of rotation
Combination of two ECG-goniometers for 2-angle alignment with one center of rotation
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Noise
Noise is the standard deviation ( σ ) of all additionally captured random values made during any static or dynamic ongoing measurement at a specific bandwidth .
Stability
The stability is the change in bias over time .
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Maximum load
Maximum normal load refers to the maximum amount of weight or force applied perpendicularly to the center of the mounting surface that a positioner can bear without damaging its structure . The positioner needs to be mounted in the intended orientation . Loads around the maximum may influence other specifications .
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Θ positioner
ECGt5050
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Φ positioner
ECGp5050
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