+2

VIN Low Error - Can we add a delay or disable the error

J C. Crow 3 weeks ago in IQANdesign updated 2 weeks ago 2

We have had multiple issues using ratiometric sensors that end up sending voltages below the 0.5 threshold. If the input drops to 0.250 then the system throws a VIN low error. The error value only exists for an instant. The sensor output is jumpy. I wish we could add some averaging, signal stabilization or add a delay on the error to filter out these events. Or maybe we could define the low error value instead of using the minimum/2. 

In retrospect, it realize I could have set the range to 0 V and extrapolated the value of the output to keep the calibration the same, but I cannot do this on an existing program because the min and max outputs are not part of the calibration. 

+1

Put the vin in a function group and enable it after delay

The sensor is going out of range for an instant at various times. I can't reliable predict the out of range condition to disable the input. I have a 500-4500 mV ratiometric pressure sensor with a range of 0 to 100 psi. In certain transient conditions, the signal is dropping below 0 psi and the sensor is dropping below 250 mV and causing a low error. I would like to be able to lower low threshold or add a delay before the low error comes on. 


I considered changing the range of the sensor to 250 to 4500 mV and adjust the output to -6.25 to 100, but this will not be backwards compatible without recalibrating the sensor.