Laser beta lasermike LS8000-3 - Manual (Page 32)

LaserSpeed 8000-3 Instruction Handbook
Installing the System
Part No. 93463 / Drawing No. 0921-01561 Page 32 of 221 Revision A (Sep 2007)
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.