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.
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. 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.
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. accuracy measurement value true value
Figure 1: Difference between measurement accuracy( trueness) and measurement repeatability.
Center of rotation
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.
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.
Θ positioner
ECGt5050
Figure 2: Combination of two ECG-goniometers for 2-angle alignment with one center of rotation
Φ positioner
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