•
With interlaced mode 4x: ± 0.1875°
±0,1875°
2°
±0
±0,1
,1
,187
875°
5°
5°
2°
2°
2°
Figure 26: Jittering of the individual measuring points in the affected angular range
Formula for calculating the minimum object size in interlaced mode
For calculation of the minimum object size
With interlaced mode 2x: (10.4 + 26.2 + 13.1 mrad / 2) * 16,000 mm + 7 mm =
697 mm
With interlaced mode 4x: (10.4 + 26.2 + 13.1 mrad / 4) * 16,000 mm + 7 mm =
645 mm
3.4.11
RSSI values
RSSI (Received Signal Strength Indicator) is the measure of the signal strength that the
device receives. This value is calculated for every measurement. The device therefore
provides, for every echo signal, an associated RSSI value for the signal strength.
The RSSI values have a resolution of 8 bits with whole-number values between 1 and
255, where 1 represents the weakest signal and 254 the strongest signal (e.g., with a
reflector).
A value of 255 means “dazzled”. The value 0 (zero) means that the received energy
was too low to produce a valid measured value. A valid distance measurement has at
least an RSSI value of 1.
If the RSSI value is 0, then no distance measurement is possible. There can be two
reasons for this:
•
The target object lies outside the sensing range.
•
The target object has an extremely low remission.
Please note that white paper can have very similar values as a reflector at a short
distance.
The RSSI values are sensor-specific, relative values that can vary slightly between
different devices and during the service life of the device.
3.4.12
Contamination indication
The device has an front screen to protect it. This front screen can get dirty. Contamina‐
tion reduces the energy emitted and received by the laser beam. As a result, scanned
objects appear to have a lower remission than they actually have and, with a certain
level of contamination, it will no longer be possible to perform measurements.
The contamination is constantly measured by a separate system during operation. A
contamination warning is output first for the different degrees of contamination. If the
front screen is not cleaned and contamination increases, then a contamination error is
output.
Depending on the application in which the device is used, you can choose from differ‐
ent contamination measurement strategies.
3
PRODUCT DESCRIPTION
24
O P E R A T I N G I N S T R U C T I O N S | LMS1104C-111031S01
8023051/1AZG/2021-05-10 | SICK
Subject to change without notice
