Input Bias Settings; Input Digital Filter - Autonics TM Series User Manual

6.1.4

Input Bias Settings

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6.1.5

Input Digital Filter

It is not possible to perform high accuracy control if the PV (Present Value) fluctuates
because of noise elements, disturbance, or instabilities in the input signal. Using the Input
Digital Filter function can stabilize PV to realize more reliable control.
Initial Setting Group
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This feature is used to compensate for input bias produced by thermocouples, RTDs,
or analog input devices, but NOT by the controller itself.
The input bias adjustments function is mainly used when the sensor cannot be
attached directly to control object. It is also used to compensate for temperature
variance between the sensor's installation point and the actual measuring point.
Group
Initial Setting Group
If the controller displays 78℃ when the actual temperature is
80 ℃, set the input bias to 2 in order to adjust the controller's
display temperature to 80℃.
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Group
Input Digital Filter
When the Input Digital Filter is set to 0.4 seconds, the digital filter is
applied according to a sampling value collected over 0.4 seconds (400
ms).
When the Input Digital Filter is used, PV (Present Value) can vary from
the actual input value.
Parameter
-999 to 999 (H)
Input Bias
-999.9 to 999.9 (L)
Make sure that an accurate temperature variance measurement
is taken before setting values of Input Bias. An inaccurate initial
measurement can lead to greater variance.
Many of today's temperature sensors are graded by their
sensitivity. Since higher accuracy usually comes at a higher
cost, most people tend to choose sensors with medium
sensitivity. Measuring each sensor's sensitivity bias and using
the Input Bias feature for correction can ensure higher accuracy
in temperature reading.
Parameter
6 Parameter Settings and Functions
Factory
Range
Default
0
Factory
Range
Default
0.1~ 120.0
Unit
Digit
Unit
0.1 Sec.
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