Hi all I would like to ask about lowpass filter.Is there any way of making a simple lowpass filter without any add on in Labview 7.1. We are trying to connect a micro-switch into a DAQmx device, but the thing is, since the switch is somehow ground-connected to a stepper motor, whenever the motor runs, it will have spikes, and those spikes were read as 1 logic in the labview. Since we don't have any signal processing add ons in the labview, we are trying to make it ourself. Thank you

Though all suggestions are meaningfulBut solution has not been achieved. So actually, we tried to change from analog input to digital input in our DAQ device. Hopefully the -up-to-10V-spike will not spoil our DAQ device. And it turned out OK. In the digital input, the spikes has not appeard even once, and we consider it done. @ t06afre: thanks for the hardware set up suggestion, but since this is a testbox that we are dealing with, its not gonna be easy to put capacitors in the motors and unlikely considered to be done. The twisted pair cable is not a bad idea though. We thought that software filter solution would be the best (less time needed and less messy) but its not like we have not thought of using hardware filter (R-C circuit, duuh).And about the "minimum pulse width" setting, isn't only applicable for some DAQ device? CMIIW

LabVIEW

lowpass filter in labview 7.1

Solved!

t06afre

Nice list of noise reducing tricks. I'm keeping a copy in my Data Acquisition Reference folder.

Labview 8.5
Meas Studio 2008

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LabVIEW

lowpass filter in labview 7.1

Re: lowpass filter in labview 7.1