Changes between Version 8 and Version 9 of WikiStart


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Timestamp:
Mar 17, 2017, 11:52:55 AM (8 years ago)
Author:
bouyer
Comment:

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  • WikiStart

    v8 v9  
    4545full range (or +/- 4.4mA on the 2.45A range input). Below are plots for measures on the 0.61A scale.
    4646
    47 [[Image(0mA.gif, 50%, align=left, title="ADC values for 0mA",longdesc="ADC values for 0mA")]] [[Image(536.7mA.gif, 50%, align=right, title="ADC values for 536.7mA",longdesc="ADC values for 536.7mA")]]
     47[[Image(0mA.gif, 50%, align=left, title="ADC values for 0mA",longdesc="ADC values for 0mA")]]
     48[[Image(536.7mA.gif, 50%, align=right, title="ADC values for 536.7mA",longdesc="ADC values for 536.7mA")]]
     49
     50From the 536.7mA measure we have a 8% error for the ADC's output (we expect 3559, we get 3851). We can use this to correct our convertion ratio:
     51adc(i)=3851/536.7 * i (with i in mA). With this conversion function, and
     52excluding the value at 0mA, the error with the measured ADC output is
     53at most 4, which is within the noise.
     54[[Image(i_o.gif, 50%, align=right, title="current to ADC outut",longdesc="current to ADC output")]]