Laser LS8000-3 manual Material Present Dropout Time, Material Present Validation Time

LaserSpeed 8000-3 Instruction Handbook

RS-232/RS-422 Communication

F Material Present Dropout Time

F<CR> Read

Response Format: <N>

F<N><CR> Set

<N> is an integer from 0 to 500, specifying the Material Present Dropout Time in milliseconds.

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 to be end of the material. This function is very useful when making length measurements on poor reflecting material.

G Material Present Validation Time

G<CR> Read

Response Format: <N>

G<N><CR> Set

<N> is an integer from 0 to 500, specifying the Material Present Validation Time Limit in milliseconds.

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 the 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 signalled by setting the length output (either in continuous output mode or Final Length Mode) to all 9’s.

M Material Present Threshold Level

M<CR> Read

Response Format: <N>

M<N><CR> Set

<N> is an integer from 0 to 4095 that specifies relative threshold level of the Material Present (MP) signal. When using Internal Material Present, the LS8000-3 determines if there is something in the measurement area by measuring the amount of reflected light. This measurement is compared to the threshold.

A setting of 0 would take very little light back on the detector to trigger MP. A setting of 4095 will take a lot of light on the detector to trigger MP. A good starting place is in the center of the range.

Part No. 93463 / Drawing No. 0921-01561 Page 133 of 221 Revision A (Sep 2007)