Hi vedita,
What version of LabVIEW are you using?
You should be able to select different gains for different analog input channels. If you want a 1000 gain, then you would need to set your limits to +/- 0.01 volts (0.01 V * 1000 = 10 V), the NI-PCI 6250 will select the most appropriate gain for each channel.
I modified your code a bit and attached it to this post. Now, you have two virtual channels (one with AI 0-6 set to +/- 0.01V and one with AI 7-8 set to +/- 10 V). Please let me know if you have any other questions.
Thanks and have a great day!
Regards,
Erik
Message Edited by Erik J on 11-06-2006 03:25 PM