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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
09-09-2007 01:51 PM
09-10-2007 10:46 AM
09-10-2007 11:12 AM
09-10-2007 12:10 PM
09-13-2007 11:50 AM - edited 09-13-2007 11:50 AM
Message Edited by Zeyad on 09-13-2007 11:51 AM
09-14-2007 05:01 PM
02-23-2010 05:15 PM
Hi zeyad,
were you able to get a faster reading rate afterwards? I know it's been a long time but I'm encountering the same problem right now with 6485. Could you update with a new vi file?
02-24-2010 10:56 AM
rodmanhust,
Did you try any of the other suggestions above? Did you have problems with those?
02-24-2010 11:16 AM
Hi rodmanhust,
I gave up on trying to speed up the picoameter with lab view. I reached the conclusion that there were limitations in the speed of the device and the Labview. Keep in mind that I’m using R232. Finally I decided to record the analog signal with a BNC concoction and I dumped the idea of automating my experiment.
02-24-2010 01:30 PM
Zeyad and Eric,
thanks for your comments.
I'm also using a RS232 connection for KE6485, and with the Fetch function I used (as in the attached vi file) I could still only get fastest sampling rate at about 0.5s. With Read function I get ~0.7s, so the fetch is only slightly better (only one device connected, so no need for Multi Point, right?) . However, in the vi file if I place the "Initiate" function ("help" says it has to be used before Fetch function) outside the while loop the sampling rate is much faster, reaching down to ~0.01 sec, the problem is that it only reads a static signal. I think KE6485 is capable of generating fast sampling, because if I switch "rate" to fast on the front panel, it shows a really fast changing current. Maybe RS232 is the bottleneck? I'm not quite sure what's a BNC, but did it help Zeyad?
In my setup, frequency is 60HZ, and NPLC is 1. When I tried to change NPLC and run, program freezes w/o any data reading. so right now I really don't know how to improve sampling rate. Even ~0.2 sec would be a huge help. I wonder if you guys could take a look at the vi file for me and let me know if there is anything I can do. thanks!