Different configurations for each channel

[Neo6]

Hello all,

I am using Signal Express 3.0. My task is to acquire signals from 6 channels. In my signal processing I am using steps like filtering, tone extraction and data averaging.

Is it possible to configure each channel with different parameters ?? for example 

for channel 1 - max 10v, min-10v , filtering lowpass 10KHz, tone extraction-5KHz

for channel 2-  max 5v ,  min-5v   , filtering highpass 30kHZ, tone extraction 35KHz

for channel 3-  max 2v, min -2v, filtering lowpass 25KHz, tone extraction 20KHz

Thanks 

Vaidhin.

[DFGray]

Your success will depend upon your hardware. The biggest issue is that you want to take the data with different ranges on each channel. If your data acquisition device is simultaneously sampled, this is not a problem, since each channel will have independent amplifiers.  If your data acquisition device is scanned, the range will need to change at each data point, which will require a settling time, reducing the maximum rate you can take data.  If you are taking data slowly enough, and your device is fast enough, this is not a problem.  You can reduce the problem by minimizing the range changes and the amount of range change in your scan order.  Don't forget the finish to start transition.  Let us know what you are using and the parameters you want to run with and we can offer suggestions.  Please include both range and data acquisition rate for each channel.

Once you have the data, analysis can easily be done on a per channel basis, so that should not be an issue.

Good luck and let us know if you need more information.

<shamelessPlug>I would also recommend you upgrade to SignalExpress 2012.  It is our best version yet and includes several features not found in 3.0 (e.g. zero offset).  Full disclosure: I am a National Instruments employee.</shamelessPlug>

[Neo6]

Thanks for the quick reply and giving such a good explanation from hardware prespective. I have few question from software side.

For example in signal Express, if I add filter step (or any other), Is it possible to configure filtering parameters for each channels seperately ?  For Voltage, I can configure each channel with different parameters, but when comes to filtering and tone extractions, I am not able to configure for each channel seperately? is there any way to to this???

I have Signal express license for Signal express 3.0.  Is it possible to activate signal express 2012 with same key? Does it have any effect on my Labview 8.6?

Thanks and regards

Vaidhin Polisetti

Using Labview 8.6, signal express 3.0 with windows XP.

[DFGray]

You can use different filter parameters for each channel by using a different filter step for each channel.  The same is true of tone extraction.  The steps are designed to take either groups or single channels as input.  When selecting the input, select the individual channel, not the group of channels.

Unfortunately, SignalExpress 2012 will require a different activation key than 3.0.  It will also not work with LabVIEW 8.6, although it will not effect your installation or the working of LabVIEW 8.6.  The oldest LabVIEW version SignalExpress 2012 supports is LabVIEW 2009.

[Neo6]

Thanks for the reply. I am planning to install Labview 2009 SP1.  I will  try and get you back, if I have any querie

Thanks

Vaidhin.