Laser LS8000-3 manual Starting/Ending Length Correction

LaserSpeed 8000-3 Instruction Handbook

Installing the System

Starting/Ending Length Correction

The Validation Time Limit feature is used because the Material Present signal tells the gauge that material is indeed moving through the measurement zone. If valid velocity measurements cannot be made, then a small amount of length will not be accumulated which, in turn, will cause a length error. This may or may not be a problem, depending on the velocity of the material when it passes through the measurement volume during this time. The start-up length-correction is executed to obtain a more accurate length reading. Each measurement update is divided into small subintervals. When the Material Present signal is received within an update period, the time it was received is recorded with a subinterval clock. The length is calculated by using valid velocity and integrating over the time measured with the subinterval clock. For example, if the material speed is 10 meters per minute and material enters the measurement volume in the middle of the 1-millisecond update period, the subinterval time of 0.5ms is used to calculate length rather than the 1- millisecond period. In this case, a 0.083 mm correction would be made. The same type of correction is made when the material leaves the measurement volume.

If problems are encountered during any of the installation steps, contact Beta LaserMike for assistance.

Part No. 93463 / Drawing No. 0921-01561 Page 33 of 221 Revision A (Sep 2007)