Problem using expression source

[maxascent]

I am trying to use the expression source from the article "Using an Expression Source to Drive Your SPICE-Based Circuit". I do what the article says but when I try to select the expression source it is not listed in the instrument window. I can run the example but when I click on the expression source I get the following message.

Cannot find the LabVIEW instrument "LVInstrIF820/Expression_Source". The following instrument(s) will not work properly:XLV1

I have the LVInstrIF820.dll in the following directory C:\Program Files\National Instruments\Circuit Design Suite 11.0\lvinstruments. So I am not quite sure what is going on. I am using v11.0 of Multisim.

TIA

Jon

[Mahmoud_W]

Hi Jon,

The Expression Source instrument in this tutorial was created using LabVIEW 8.2 so it's good that you have the corresponding .dll file in the instruments directory.

What you're missing is probably installing the LabVIEW run time engine for version 8.2 as well. It's available here.

Close Multisim, install the engine and then reopen Multisim and you should the instrument there.

Let me know if that didn't work.

Mahmoud W

National Instruments

[Lewis_G]

Hi Jon,

You need to add the Expression_Source.llb file to your LabVIEW instruments directory. You can find the file attached or I got it from the Using an Expression Source to Drive Your SPICE-Based Circuit example program. I placed the file in my directory and it appeared on the toolbar in Multisim.  

You could also check the directory is correct by going to Options>>Paths>>Miscellaneous>>User LabVIEW instruments path in Multisim.

Let me know if this doesn't work.

[maxascent]

It was the LabVIEW run time engine that was the problem.

Thanks everyone for the help.

Jon