In LabVIEW, how can I access the channels of my 40 channel single-ended multiplexer?

[LMT]

I need to access channels in order to increment them while I am using an external multimater to measure each channel.

[Brian_Vibert]

I think a little more information is needed. Like what kind of multiplexer...

[Dennis_Knutson]

If this is related to your earlier post about the HP34970, I think I might understand now what your problem is. The instrument library assumes that you are using the internal DMM. None of the other VIs have a numeric input for channl. I've attached a VI that should allow you to specify slot and channel #. Follow this VI with the one for taking a reading from the DMM.

[labviewhokie]

I have a similar question...except I am using a 20-channel mux (HP34901A without the internal DMM) instead of the 40 channel one. I looked through the code and it seems like there should not be any difference in scanning, i.e.I should also be able to use the channel_select.vi provided earlier without having to modify, but I want to confirm.

FYI, The difference between the 40- and 20- channel mux is the 40 channel is single ended and in the 20 channel one each channel has a HI and LO (differential)

Also, I have connected the COM on this 34901A module to an external DMM, so do I need to add any another VIs or can I just use the channel_select.vi as long as I initialize the 34970A instrument, etc? (and then write to file to save the data)

Thanks

[labviewhokie]

I am using Labview 7.1 and have downloaded the HP34970A drivers associated with the H34901A mux module.

[labviewhokie]

Sorry for the multiple posts.

Dennis I just saw that in August 2006 you had posted something that answered this question. Let me try what you showed and repost if I have further questions.

However, feel free to add any other suggestions you may have...

Thanks!

[MXI Master]

labviewhokie,

Could you post a link to the Forum you found the answer in to help future people with the same issue? Thanks

[labviewhokie]

http://forums.ni.com/ni/board/message?board.id=170&message.id=203411&query.id=42039#M203411

You can find it by typing "34901a" in the search box