Parameter setup and measuring operation
LDM52 OEM, Release 003, Revision 000
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Remarks:
In case of poor target reflectivity, it cannot be guaranteed at 100 % that the respective measure-
ment will be completed within the available time.
If the time between 2 measurement outputs is too short a warning will be generated
(--> w1910).
The output frequency will remain constant.
The frequency of warnings and error messages will increase if MF > 20 Hz. In addition an output
of wrong distance values could be happen with bare probability. For optimal results the recom-
mendation is to set MF to 20 Hz or lower in mode DT.
There are the following alternatives:
1.
A variable output frequency can be selected for surfaces with low reflectivity. The LDM52
OEM will keep measuring until a representative distance value can be determined.
Normally, the measuring period ranges between 0.01 and 3 seconds (no average determina-
tion). The maximum measuring time is 6 sec.
2.
Where a measured value output is not needed, a lower frequency can be set via the parame-
ter MF. While this parameter influences the output frequency, it has no impact on the inter-
nal measuring frequency.
The output frequency can also be reduced by using the average determination function.
For example, if an average determination covering 5 measured values (SA 5) includes a warn-
ing, only 4 measured values will be used for average determination. Where there is only one
measured value, there will be one output. The output of warnings is avoided.
The table below shows exemplary the ranges and accuracies in relation to the target surface for
outdoor applications. The conditions for the measurements were environmental temperature of
+25°C and ambient light around the target of 1.2 kLux.
The measuring range in an application depends on a large number of factors, e.g. target reflec-
tivity, stray light, output frequency and other enviromental conditions.
Before integration of LDM52 OEM in a whole system special tests are necessary, to get optimal
application results.
