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ADCPro ratioing data from two channels

Robert Jarratt
Prodigy 60 points
Other Parts Discussed in Thread: ADS1258EVM-PDK, ADCPRO

I am using ADCPro with an ADS1258EVM-PDK and it appears to be working well.  Is there a way to ratio data from two A/D channels within ADCPro?  I have used the custom units conversions but this seems to be for  operating on data from all channels in the same way.  I understand that data can be exported to a text file and then imported into a program such as Excel for manipulation but is there a more direct or straightforward way to ration just two channels of data?

Thanks,

Bob Jarratt

  • 0
    TI__Mastermind 23235 points

    Mr Jarrett -

    The same scaling is applied to all channels, whether it is the default or any custom equation that you apply to the data.  ADCPro doesn't support independent channel scaling.  You can view each channel individually, which would scale the graph to each channel, but not multiple channels at once.

  • 0 in reply to Greg Hupp
    Prodigy 60 points

    Greg,

    Thank you for your answer and I understand that all channel data is acted upon in the same way.  I am now trying to the Data Recorder function to store the acquired data so that I can work with it externally.   I have been able to sort of do this but not in an exactly predictable way.  For example, the ADCPro User Guide ( section 3.5.5 Data Recorder) indicates I can select the number of samples to record by putting a number in the "Length" control.  The closest thing I see to a Length control is the "Sample" box.  But when I put a number in this it does not equal the number of samples I actually get recorded.  For example, if I enter a block size of 1 and a sample size of 1 I get 128 data values for each channel stored.  If I enter a block size of 512 and a sample size of 1000, I get 1024 data values for each selected channel.  What am I not understanding correctly about this?  What I really want is to get only one data value for each channel selected.  Is there a way to do this?

    Thanks,

    Bob Jarratt

  • 0 in reply to Robert Jarratt
    TI__Mastermind 23235 points

    I think the behavior you are seeing is that the data collection always happens at either 256 or 128 multiples (depends on the software).  This is due to USB data transfer size.

    While the data recorder should round to the next highest multiple, when you import the data, you should be able to display only the input number of samples.