Missing "ButterworthLowpass.VI"

[davey31415]

I'm upgrading to LV8.5 and when loading a program I get an error stating that ButterworthLowpass.VI can not be found.  I've searched the web and haven't found a reference to this.  LV is looking in ".....\LabVIEW 8.5\instr.llb\Agilent 34401\Public\Utility\ButterworthLowpass.VI"

Is ButterworthLowpass an old VI which is no longer available?

[RavensFan]

It looks like that VI was part of an Agilent Instrument driver. Try reinstalling that Agilent driver now that you have LV 8.5 installed.

[Coq_Rouge · Accepted solution]

It could also be that you have "downgraded" to base version of labview. Filter VIs are not included in labview base

[Dennis_Knutson]

A driver for the 34401 has shipped with every version of LabVIEW for many years and I doubt that it was ever part of the driver. I suspect that the search is just showing you the last place it is looking. Unless of course, someone modified the shipping driver to include a custom function. If that's the case, you need to find the original. It would also help if you mentioned the version of LabVIEW that you are upgrading from and if you posted the VI you aer trying to load.

[davey31415]

I am using the Base verison, that is probably the issue.

Is it possible to modify a program which uses filter VIs with the Base version?  Would copying the VIs from the other, older version work?

Or will an installation of the older version be my only option here?

The upgrade is from 7.1- I believe it was Professional but I will need to verify that.  I know it supported events whereas the new version does not.

Thanks,

Dave

Message Edited by davey31415 on 03-16-2009 11:50 AM

[Coq_Rouge]

I guess you can use the old filter VIs. But if you build an application you may have some problems. Your old filter functions is located in a DLL file ...\National Instruments\LabVIEW 7.1\resource\lvanlys.dll. Perhaps you can rename this dll, and modify all filter VIs to call the renamed DLL instead. I will not recommend replacing the new lvanlys.dll with the old one.