Sorry for the second post.. Its actually been a day since my first post. Sorry if two mails come up.
Hi, First Thanks to everyone for replying to my previous post for GPIBs. I found the subVIs required for communication with the Keithley 237 and also HP Agilent 34401A and started communicating. While reading from the HP multimeter I sometimes get error messages. This does not come always. The system works say N number of times and then sends an error message (N+1)th time. The error number is "1073807339" - Timeout expired before operation completed. To find out the exact place of error, I started doing the execution highlighting. Error occured after a couple of successful runs. The error was not in read/write of Keithley instrument. It was in the reading process of the Agilent multi meter. The VI for the HP Agilent has a subVI "HP34401A Read Meas.vi" where the error pops out from. Inside this suBVI it stops at "VISA wait for RQS" - Request for service from the device. The error for timeout expiration arises from here. This error does not come always - but whenever error comes it is right at this point. At this point, after the error popped up, I stop the VI and run it again. At this point, the front panel of the display of agilent meter displays "error". Then I switch off the instruments and shut down labview to start it again. It works. First time error is in RQS and if I stop and run again, front panel displays error which I feel is because of the error in RQS in previous run. Also one other problem I have is that, once the device has been used (agilent HP), I am not able to return it to the local mode. I used the "HP local/remote control" vi and put it in "local" but it does not change at the end of the process. Also, already there is a "Close" vi whose description is "Closes the IO mode and returns instrument to local mode". That does not work either. Could anyone let me know as to what mistake I am making. I hope I am clear in explaining the problem. Thank you all for the help, Gokul --- Gokul <[EMAIL PROTECTED]> wrote: > Hi > > I am pretty new to LabView programming and am having > a > project that involves acquisition using GPIB. I have > never used GPIB before. > > The two instruments that that I will be using are > Keithley 237 HV Source and a HP Agilent Multimeter. > The process is basically applying current from the > HVsource to material in test and measure the voltage > across using the HP multimeter. > > Being new to GPIB, I was wondering how to start on > this. I was wondering whether there are any standard > routines to reading/writing, configuring instead of > me > writing for the Keithley and HP instrument that I > will > be using. This would be helpful for me to start > with. > > Also, I would like to know where to start reading to > develop progams for the same. > I was kind of stuck for past 2 days when I saw the > LabView user group online. > > Thank you all for the help, > > Gokul > > __________________________________ > Do you Yahoo!? > Get better spam protection with Yahoo! Mail. > http://antispam.yahoo.com/tools > __________________________________ Do you Yahoo!? Yahoo! Search - Find what you’re looking for faster http://search.yahoo.com
