Setting The Temporal Filter [Oxm]; Processing An Invalid Measured Value [Oxm] - Baumer OX200 Operating Manual

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9.3.3

Setting the Temporal Filter [OXM]

With the Temporal Filter function, the noise can be reduced and thus the resolution and re-
peatability increased. The response and drop-off times are increased and moving objects detec-
ted less precisely as a result. The temporal filter calculates the results in the form of moving val-
ues. The oldest measurement value is removed as soon as a new measurement is added.
Therefore the measuring frequency is not affected by the temporal filter.
To set the Temporal Filter function, proceed as follows:
Instruction:
a) In the menu, select the Parametrization | Measurement Tools Parametrization mode.
b) In the Measurement Tools window, go to the desired measurement tool and select Tem-
poral Filter.
c) Set the Temporal Filter function.
You can set the following filters:
Average:
n
This filter calculates the average value of an array. You can set the length of the filter.
Median:
n
This filter calculates the median value of an array of measurement values, the length of the
array can be set. The median is defined as the value below which 50 % of the values in the
array are located. The median filter can be used to suppress individual outliers. With greater
filter lengths, the filter can also suppress several successive outliers.
Example: Calculating the response time with a measurement frequency of 500 Hz
Formula:
n
▪ Response time = 1 / measurement frequency × (median + average)
Sample values:
n
▪ Measurement frequency: 500 Hz
▪ Median = 4
▪ Average = 16
Calculation:
n
▪ Response time = 1/500 Hz × (4 + 16) = 0.04 s = 40 ms
9.3.4

Processing an invalid measured value [OXM]

With the Invalid Value Handling function, you can define how long a valid measurement value
is to be held at the output if the measurement value is followed by invalid measurement values.
In this way, sudden but expected signal interruptions can be compensated. Each measuring tool
can be set independently.
To configure the processing of invalid measurement values, proceed as follows:
Instruction:
a) In the menu, select the Parametrization | Measurement Tools Parametrization mode.
b) In the Measurement Tools window, go to the desired measurement tool and select Invalid
Value Handling.
c) Enter the desired holding time for the invalid measured value.
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