Laser LS8000-3 manual Material Present Adjustment, Material Present Dropout Time Selection

LaserSpeed 8000-3 Instruction Handbook

Installing the System

Alternatively, the analog port can be configured to output QF on a 0–1 V scale. The QF can then be monitored by connecting a panel meter to the analog output and displaying the voltage. A third method of monitoring the Quality Factor is to reassign one of the pulse outputs to output the Quality Factor as a frequency output.

To ensure quality measurements, the laser beams must maintain “contact” with the product. If the product exhibits large movements during operation, it should be stabilized with external roller guides. Beta LaserMike offers optional product guides. Contact your local Beta LaserMike sales representative or the factory for additional information.

Material Present Adjustment

The intensity of the light reflected from the measurement area can be used to determine whether material is in the measurement zone or not. To compensate for varying reflectivity of different materials, it is often necessary to adjust the threshold of the light detection circuit. This adjustment can be made with a serial command or by using the LaserTrak software.

Material Present Dropout Time Selection

If you are taking measurements and the Material Present signal is lost for less than the selected Material Present dropout time, the loss is considered to be a momentary loss of signal and is ignored. If the signal is lost for longer than the selected Material Present dropout time, it is considered the end of the material. This function is very useful when making length measurements on poor reflecting material.

Validation Time Limit Selection

The validation time limit is used to start making length calculations. Two conditions are necessary to start a length measurement: Material Present and valid velocity data. When material enters the measurement volume, the system determines the time between the Material Present signal and the first valid data. If the time is less than or equal to the validation time limit (selectable via LaserTrak or ‘G’ command), then the start-up length-correction is calculated and a length measurement is initialized. If the time between the Material Present signal and the first valid velocity data is longer than the validation limit, then the length calculation is aborted and an error or fault is sent. This error is sent by setting the length output (either in continuous output mode or Final Length Mode) to all 9’s.

Part No. 93463 / Drawing No. 0921-01561 Page 32 of 221 Revision A (Sep 2007)