BOXCAR SR245/250 : problem with scanning

[leonidd]

Hi, everyone!

I currently use BOXCAR SR245/250 Integrator to aquire voltages from photodiods. When I scan one value per second from every of two channels, using command "MA;I8;;?1;?2", everything goes allright. But any attempt to reduce period of scan lower then 800 milliseconds leads to absolutely wrong results! 

I also tried to use another  scanning commands from BOXCAR user's manual, but unsuccessfully - they have the same problem.

Is there any method to accelerate measurements but avoid wrong values?

Thanks!

Message Edited by leonidd on 10-22-2008 08:20 AM

[mr_]

leonidd -

I'm not familiar with the Boxcar SR 245/250 product.  However, others on the forum may have had experience with this device and may be able to provide you with more information.  Ultimately this sounds like a possible limitation with the Boxcar SR 245/250 integrator.  This may be a question best suited for the manufacturer of your device. 

I did look at your LabVIEW code.  If you plan to continually write and read to and from your instrument, you should place the VISA Configure Serial Port and VISA Close outside the for loop.  You may want to try this and see if it improves your scanning times because you are essentially re-configuring the serial port and closing your VISA connection every time (adds overhead), whereas you only need to do this once.

[leonidd]

Unfortunatelly your advice didn't decrease the scaning time. But thank you anyway. It's more correct to have VISA Configure Serial Port and VISA Close outside the for loop.

Hope that someone has experience in working with particullar that device.