| | | in a place where the label Is clearly visible, before somebody can look into the beam. Laser radiation is so weak, that the human eye will not be hurt, while the closing reflex will prevent further damage to the retina. Looking to the diffuse reflected laser light is not dangerous. Follow the safety instructions: •Do not stare into the beam •Do not stare into beam reflections on shiny surfaces •Only authorised personal may open the sensor | | Accuracy Difference between real distance and measured distance. Accuracy includes all errors ofthe measurement like linearity, resolution, noise, drift thermal growth of sensor head and mounting. Measurement frequency Reciprocal value of reaction time, also known as "bandwith". The measurement frequency specified by MEL specifies, which frequency of mechanical change ofthe object will be translated into a corresponding electrical output signal. MEL has sensors with a bandwith from 0.1 up to 500 kHz. To achieve the measurement frequency at the output, the internal sampling frequency must be (theoretically) minimum 2 x the highest measurement frequency. For MEL sensors, the sampling frequency is 4 x measurement frequency (exception M500). Light intensity The intensity ofthe diffuse reflected spot creates a signal in the sensor proportional to the intensity or brightness of the spot. This signal is an indicator of "how good is this mesurement". The intensity signal is fast, and can change from one spot to the next within milliseconds. This can help to recognise small changes in a surface, like scratches, weld seams or other artefacts, which will not create a change in the distance output signal. Linearity Difference between the actual measurement and the ideal curve. Linearity is specified in % of total measurement range, or in absolute values. Shutter time Defines Laser on time for appropriate measurement. Shorter shutter time gives better measurement results for moving targets. | | |
| | | CLASSIILASER PRODUCT '\ Fig. 8 Warranty The warranty period is 24 months. Warranty does not include damage due to false handling or attempt to repair or modifications by third party. In case of repair, send the unit free of charge and free of customs, packed in the original packaging materials to: MEL Mikroelektronik GmbH Breslauer Str.2 85386 Eching / Germany Send transport reference and tracking information to MEL by email or Telefone: phone: +49-89-327150-0 fax: +49-89-319 20 23 Changes and further development reserved. Definition ofterms Range The range where the sensor can measure. Resolution Smallest recognisable change in the signal. Noise Random noise in the system, unwanted deviation of the output signal. | | |