Sensor Gain And Bias Override; Use Of Gain And Snsr_Offset In Yvib; Maximum Input Voltage Definition; Minimum Input Voltage Definition - GE Mark VIeS System Manual

8.3.2.7 Sensor Gain and Bias Override

Depending on the specific application of a sensor, a different gain or DC bias may be needed. The YVIB provides a
configurable override for the default values for Gain and Sensor Bias through the GnBiasOvride parameter. Setting
GnBiasOvride = Enable will replace the default Gain and Sensor Offset with the configured Gain and Snsr_Offset parameters.

Use of Gain and Snsr_Offset in YVIB

The sensor inputs relate to the YVIB Snsr_Offset and Input_Range values. Input_Range is a value determined by Gain
through the following formula:
_ =
Input_Range is centered on -Snsr_Offset, which allows us to define the valid input voltage range with the following formulas:

Maximum Input Voltage Definition

= − _

Minimum Input Voltage Definition

−
V = − _
It is critical that the values of Gain and Snsr_Offset are chosen correctly to avoid saturating the A/D Converter on that
input channel, which results in clipping the signal. Consider the following case, where Input Range is correctly determined,
but Snsr_Offset is too low.
Input Clipping due to Snsr_Offset
YVIB Vibration Monitor Modules GEH-6855_Vol_II System Guide 241
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