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Chapter 4 Explanation of Functions
4-37
4
■ Filter Operation
This function cuts the unnecessary signal element to stabilize the
measurement data.
The filter operation is selectable from the moving average, low-pass filter,
and high-pass filter. The filter picks out the measurement data for required
amount of frequency, cuts the unnecessary signal element, then, acquires the
stabilized measurement value.
● Filter setting
Moving average
Performs moving average on the
measurement result for the
setting average times.
Low-pass filter
Select Low-pass filter when you want
to pick out only the signal with low
frequency from the measurement data.
The signal elements lower than the
setting cutoff frequency are picked
out.
Low-pass filter is able to measure the stabilized displacement by
minimizing noise that might occur depending on the metal surface
condition.
High-pass filter
Select High-pass filter when you want
to pick out only the signal with high
frequency from the measurement data.
The signal elements higher than the
setting cutoff frequency are picked
out.
High-pass filter is effective for detecting a joint line or slot of
objects such as the eccentricity of a revolving object under a state of
largely vibration or inclination since the influence of gradual change
is minimized.
● Average Times
Sets the average times for performing the moving average . This is used for
stabilizing the unstable (including variation) measurement value. This
becomes valid when "Moving Average" is selected.
● Cutoff Frequency
Sets the cutoff frequency for Low-pass filter and High-pass filter . This
becomes valid when "Low-pass Filter" or "High-pass Filter" is selected. For
stability of filter effectiveness, set the value to below than 1/2 of the
"Sampling Cycle" setting value.
For setting of the "Sampling Cycle", refer to
"4-3-3 Common Setting" - "Sampling Cycle".