https://ni.lithium.com/t5/LabVIEW-Electrical-Power-Toolkit/Is-The-Resampler-Really-Capable-Of-Switching-Reference-Channel/m-p/3364481#M166 <P>We have had an issue where an application we have written based on the power quality examples was switching reference channel unexpected.</P><P>&nbsp;</P><P>The switching was caused by a bug in the example channel switcher which I have reported to NI directly.</P><P>&nbsp;</P><P>However it highlight an interesting issue - when the reference channels switchs there are a lot of spurious events generated - I believe due to filters in the resampling algorithm taking time to resettle (we see these for about a second).</P><P>&nbsp;</P><P>The question is, is there a way to use this and switch reference channels without causing filter effects? What other affects might this cause? We see ripples on dips which I believe to also be caused by the filters - could this be true and if so again, what could be done to remove these?</P><P>&nbsp;</P><P>I attach a screenshot of one such dip generated in the lab.</P><P><IMG src="https://ip1.i.lithium.com/11f9684387242d1ed492d119d7150578c2e4eab6/68747470733a2f2f6e692e6c69746869756d2e636f6d2f74352f696d6167652f736572766572706167652f696d6167652d69642f31393038343269413037464438333935333531453836362f696d6167652d73697a652f6f726967696e616c3f763d76322670783d2d31" border="0" alt="dip-with-ripple.png" title="dip-with-ripple.png" /></P> Wed, 02 Nov 2016 09:57:42 GMT James_McN 2016-11-02T09:57:42Z https://ni.lithium.com/t5/LabVIEW-Electrical-Power-Toolkit/Is-The-Resampler-Really-Capable-Of-Switching-Reference-Channel/m-p/3364481#M166 <P>We have had an issue where an application we have written based on the power quality examples was switching reference channel unexpected.</P><P>&nbsp;</P><P>The switching was caused by a bug in the example channel switcher which I have reported to NI directly.</P><P>&nbsp;</P><P>However it highlight an interesting issue - when the reference channels switchs there are a lot of spurious events generated - I believe due to filters in the resampling algorithm taking time to resettle (we see these for about a second).</P><P>&nbsp;</P><P>The question is, is there a way to use this and switch reference channels without causing filter effects? What other affects might this cause? We see ripples on dips which I believe to also be caused by the filters - could this be true and if so again, what could be done to remove these?</P><P>&nbsp;</P><P>I attach a screenshot of one such dip generated in the lab.</P><P><IMG src="https://ip1.i.lithium.com/11f9684387242d1ed492d119d7150578c2e4eab6/68747470733a2f2f6e692e6c69746869756d2e636f6d2f74352f696d6167652f736572766572706167652f696d6167652d69642f31393038343269413037464438333935333531453836362f696d6167652d73697a652f6f726967696e616c3f763d76322670783d2d31" border="0" alt="dip-with-ripple.png" title="dip-with-ripple.png" /></P> Wed, 02 Nov 2016 09:57:42 GMT https://ni.lithium.com/t5/LabVIEW-Electrical-Power-Toolkit/Is-The-Resampler-Really-Capable-Of-Switching-Reference-Channel/m-p/3364481#M166 James_McN 2016-11-02T09:57:42Z