Keithley 2750 interfacing with LabVIEW 8.5?

[James H]

I downloaded the Keithley 27XX - Certified LabView Plug and Play (project-style) rated 4.25.  I placed the folder into my C:\Program Files\National Instruments\Keithley 27XX.  And yes, in this folder, there are the Examples, Public, and Private folders, the Keithley 27XX LabVIEW Library, and the Keithley 27XX LabVIEW Project.  (And a Readme.)

I'm not sure how to post a print screen here, the image comes out blank.

[Dennis_Knutson]

If that is the path you installed it in, then you did not install it to the correct location. It should be \National Instruments\LabVIEW 8.5\instr.lib. If you are using a different version of LabVIEW, obviously the 8.5 part will be different.

To post a screen shot, save it as a png or jpg file and click the Browse button next to the Attachment box below the message body.

[James H]

Okay, can I simply move the Keithley 27XX folder into this directory: \National Instruments\LabVIEW 8.5\instr.lib

Or, do I need to download again.  I think we are only downloading the folder, not installing?

http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=0470C9F181C02E75E0440003BA7CCD...

Keithley 27XX

Certified LabVIEW Plug and Play (project-style) Instrument Driver

I clicked on the link under "Download Process" - LabVIEW 8.0 - download keithley_27xx.  This opens a zip folder which I have extracted.

Is this correct?

Inside the Example folder, I opened the Keithley Acquire and Graph vi  and attached is the error message that I'm getting.

[Dennis_Knutson]

You can simply move the unzipped folder to the correct location.

In any case, you got the example to open and you ran it. The error you get is usually because the instrument had no data to send and with serial, it probably did not receive the correct command or no command at all. As I already mentioned, it is vital to have the serial port on the pc set to be exactly the same as the port settings of the instrument. There are settings on the front panel to configue the pc. I don't have the driver here but I think the default is 9600 baud. Change either the VI's settings or the instrument's.

[James H]

Hi Dennis,

Okay, I got LabVIEW to pick up something and plot something in the graph, using Acquire and Graph vi example.  How do I specify LabView to take data and plot different graphs for each channel?  Where does the triggering function come in?

Thanks.

[Dennis_Knutson]

I don't have the instrument to experiment with but it looks to me that with each scan, you get an array of measurements back. I think each element in the array corresponds to a channel. So, you can use the Index Array function to get each channel and wire them to a waveform chart.

As far as triggering, I don't see an example of a triggered acquisition, I no longer have the instrument, and it has been too long since I did for me to remember exactly the process. Sorry.