Timeout error during Fluke 8842a GPIB interfacing

[blood29]

I have one Fluke 8842a connected using GPIB to USB interface (I have a UGPlus controller-cable and not a NI version). I am trying to use Labview to read the instrument data using call library function - dlls. In specific, I am reading ultra-low resistance values from Fluke.

The problem is that the read function doesn't work if I set high-precision (smallest resistance range - 0.xxxx ohms) on Fluke and gives me a timeout error. Even a single input read command doesn't work in this range. Strangely, all other ranges like 0.xxx or more higher ranges work just fine. The only problem occurs is in the lowest range/high-precision data reading.

Fluke manual portrays that it takes approx 1.24 reading/sec in high-precision ranges. Any ideas what may be wrong with this?

Thanks!

[cstorey]

It would be good to see your code.  But, as you increase precision the time it takes to accurately make the measurement is probably longer.  What timeout are you setting for the instrument?  Why just make it 10-100x longer and see if you are able to use the range you want.

You say you are using LbaVIEW and DLLs.  Have you tried the LabVIEW driver - http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=01609CFA7F8A1E9CE0440003BA7CCD...

Craig

[blood29]

This is one program I am using. The call lib function takes the input integer address and respective trigger command (these are based on a function in the dll i am calling). Output is a string from the instrument.

The timeout you talked about, I am assuming you are talking about the timeout set at the labview software level. If so, it appears I do not have an option to do that - I have a third party software (UGPlus GPIB to USB) and there is a separate software for this. Afte I install the software, I get the dll and I am inputting the dll in labview - doesn't seem there is a way to alter the timeout. What do you suggest?

About the labview driver, I tried using the NI driver, however do you think it would be compatible with the UGPlus GPIB to USB?

I am a bit newbie in this area, there may be a chance I am making a blunder...