ipf electronic PY740025, Manual

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MANUAL [ PY740025/26 ]
•
Subject to alteration! Version: 22.10.2018
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5.6 OBJECT
To improve sensitivity to dark objects, the exposure time can be increased. This also changes the measuring
repetition time.
5.6.1 Object: Bright (Reflectivity > 18%, white-gray)
Exposure time (Pulse
duration)
Short
1
5.6.2 Object: Dark (Reflectivity 6…18%, dark gray-black)
Exposure time (Pulse
duration)
Long
1
5.7 PRECISION
By enabling filtering, the noise can be reduced and thereby the resolution can be increased.
Standard = normal resolution
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High = approx. twice the normal resolution
12
Very high = approx. four times the normal resolution
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The higher precision is set, the more measuring speed is reduced (response and the release time are
increased). The measuring frequency is not affected by using this filter.
PRECISION utilizes a moving median and a moving average filter.
Moving Median
The median of a finite list of numbers can be found by arranging all the observations from lowest value to
highest value and picking the middle one (e.g., the median of {3, 3, 5, 9, 11} is 5). The number of samples
stored in the array is called “Sample size” (e.g. {3, 3, 5, 9, 11} = 5 values). When a new sample is added the
oldest sample is removed (Moving filter). A sudden change of the measured values will only effect the output
after more than half of the samples stored resemble the new value (e.g. sample size=5 -> 3 samples until
output is effected).
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According to data sheet chapter 6.1
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Dependent upon object to be measured