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7-6

IM 05P03D21-01EN

7.1.4 Correcting Input Value

 (1)SettingBiasandFilter

Description

PV Input Bias

The PV input bias allows bias to be summed with input to develop a measured value for

display use inside the indicator.

Thisfunctioncanalsobeusedforfineadjustmenttocompensateforsmallinter-

instrument differences in measurement reading that can occur even if all are within the

specified instrument accuracies.

PV input bias is used for normal operation.

PV input value + =PV input bias PV value inside the indicator

Temperature sensed

by thermocouple

Compensation

value

Estimated material

temperature

PV Input Filter

If input noise or variations cause the low-order display digits to fluctuate so that the

displayed value is difficult to read, a digital filter can be inserted to smooth operation.

This filter provides a first-order lag calculation, which can remove more noise the larger

the time constant becomes. However, an excessively large time constant will distort the

waveform.

PV input filter is used for normal operation.

Actual input

With a small time constant With a large time constant

Input

Filtering for 2 sec

Filtering for 10 sec

Analog Input Bias

Analog input bias is used to correct sensor-input characteristics, compensating lead wire

errors, and so on.

Analog Input Filter

The analog input filter is used to remove noise from an input signal. This filter provides

a first-order lag calculation, which can remove more noise the larger the time constant

becomes. However, an excessively large time constant will distort the waveform.

7.1SettingFunctionsofPVInput

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