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How to configure different channels with different gains

Iam using SCXI 1102+pci 6250 DAQ for acquiring the voltage signals and i wanted to acquire first three channels with 100 gain and next channels with different gain(ex gain 1)
using DAQ mx create virtual channel VI,
is it possible to do it?
is it possible to acquire different channels with different sampling Rate?
Please send me some example if possible.

iam using Lab VIEW 7 express.
OS windows 2000.
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Iam using SCXI 1102+pci 6250 DAQ for acquiring the voltage signals and i wanted to acquire first three channels with 100 gain and next channels with different gain(ex gain 1)
using DAQ mx create virtual channel VI,
is it possible to do it?


It is possible. Just selecting a suitable high low limit in 'DAQ mx create virtual channel VI' will automatically select the corresponding gain settings for that channel

To do a variable gain settings on each channel, just keep this create virtual channel VI inside a 'for loop', build an array of Phyical channel names, arrays of corresponding High and low limits.

Ues enable indexing property at input to 'for Loop' and configure each physical channel along with its corresponding high and low limits. By doing this, you can configure each channel for a different gain in a single task

(Sorry i do not have labVIEW installed on my system right now, or i would have attached a sample code to illustrate this better)


is it possible to acquire different channels with different sampling Rate?


No, this is not possible

Hope this helps,

Regards,

Dev

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Hey Inst,

Dev is right. You can't sample at different rates with the 6250. Each channel shares the same sample clock and ADC. A good workaround is to sample at the highest data rate required and then to 'drop' samples in software. This obvioiusly doesn't cut down on the bandwidth being sent to your computer, but it will save you some space on disk.
Garrett H
National Instruments
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