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Thread: ADC value Units

  1. #1

    Default ADC value Units

    On the Original Thoughtstream, for the 5th and 6th bytes that make up the 12 bit ADC value (from the ThoughtStream Interface Software User's Guide), can somebody tell me what units the number is in or some way to convert it to ohms?

    thanks,
    EM
    Last edited by Andy; 05-05-2011 at 02:10 PM.

  2. #2

    Default Re: ADC value Units

    The conversion for the RS-232 TS is ...
    Probe resistance (in Megohms) = (1925 / (12 bit ADC value)) - 0.47

    Todd
    Last edited by Andy; 08-12-2011 at 02:28 AM. Reason: Clarification

  3. Default Re: New USB Thoughtstream, new software?!

    Concerning the software:
    What I would really love being able to do with the software is to export every measured value and the time when it was measured into an excel file for further statistical operations.
    Although I am not sure if this can somehow be accomplished with the current TS software, I think it could easily be implemented in a future version, don't you think?


    Thanks a lot,
    Thomas
    Last edited by Andy; 05-01-2011 at 09:15 AM.

  4. #4
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    Default Re: New USB Thoughtstream, new software?!

    Hi Thomas;

    I know you can save the session - have you checked to see what sort of format the data is in?

    -Andy.

  5. Lightbulb Re: New USB Thoughtstream, new software?!

    Hi Andy,

    my reseller here in Germany just sent me an example txt. file presumably from a TS USB where the interface software stores its saved data. It looks like this:

    7484,60991
    7490,60991
    7495,60991
    7499,60991.2
    7503,60991.2
    7505,60991.2
    7509,60991.2
    7512,60991.41
    7517,60991.41
    7521,60991.41
    7525,60991.41
    7530,60991.61
    7534,60991.61
    7539,60991.61
    7543,60991.61
    7548,60991.81
    7552,60991.81
    7557,60991.81
    7559,60991.81
    7563,60992.02
    7566,60992.02
    7570,60992.02
    7574,60992.02
    7579,60992.22
    7584,60992.22
    7588,60992.22
    7592,60992.22
    7595,60992.42
    7598,60992.42
    7602,60992.42
    7606,60992.42
    7610,60992.63
    7614,60992.63
    7617,60992.63
    7618,60992.63
    7619,60992.82
    7619,60992.82
    7620,60992.82
    7621,60992.82
    7623,60992.82
    7624,60993.03

    First column is the measured resistance value in kilo-ohm, second column after the comma is the time it was measured in seconds of the day (for example 17 o'clock in the afternoon = 17 hours * 60 minutes * 60 seconds = 61200 seconds).

    Ok, so with this, exporting into Excel or any other statistical software is a breeze. The only thing I don't like too much is the format of the measurement time. It could be more precise and starting from zero... well, maybe one can at least edit the starting point to zero seconds oneself.


    Thanks,
    Thomas
    Last edited by Andy; 05-15-2011 at 07:34 AM. Reason: clarification of TS version

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    Default Re: New USB Thoughtstream, new software?!

    Hi Thomas;

    That's good news that it's already in a simple fomat.

    I heard that the format may change with the new software. I should hear fairly soon as to what that format will be.

    -Andy.

  7. Default Re: New USB Thoughtstream, new software?!

    Hi Andy,

    now that you mention it I assume the txt. file was probably from the "old" interface software. Let me know what you can find out regarding the new USB interface software.

    Thanks,
    Thomas

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    Default Re: New USB Thoughtstream, new software?!

    Here's the poop on the new software:

    When you save a session it saves the data in a 'txt' file.
    The format of the file is comma delimited with two entries per line.
    First entry is the 14 bit probe reading , the second entry is the session time in 100th of seconds.

    To convert the 14 bit probe reading to resistance put it in the following equation...
    Probe Resistance = (7,700,010,000 / 14 bit probe reading) - 470,000 ohms

    Divide the time value by 100 to get the time in seconds

    -Andy.

  9. Default Re: New USB Thoughtstream, new software?!

    Hi Andy,

    thanks for letting me know!

    So that means that time measurement starts from 0 seconds with the new software, no matter when the measurement takes place?
    Also how many times does the 14 bit probe take readings per second (sorry - per second, not per minute)?


    Thanks,
    Thomas
    Last edited by Thomas; 01-13-2011 at 10:07 PM.

  10. #10
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    Default Re: New USB Thoughtstream, new software?!

    Hi Thomas;

    The TS USB puts out 20 readings / second.
    The record usually starts at 30 which = 0.3 secs.
    The reading that is sent is an average of six readings.
    The buffer has to fill before the first reading is sent, so that's why the first reading is at 0.3 seconds.

    Hope that helps.

    -Andy.

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