Changes between Version 8 and Version 9 of WikiStart

Timestamp:

Mar 17, 2017, 11:52:55 AM (7 years ago)

Author:

bouyer

Comment:

--

WikiStart

@@ -45 +45 @@
 full range (or +/- 4.4mA on the 2.45A range input). Below are plots for measures on the 0.61A scale.
 
-[[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")]]
+[[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")]]
+
+From 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:
+adc(i)=3851/536.7 * i (with i in mA). With this conversion function, and
+excluding the value at 0mA, the error with the measured ADC output is
+at most 4, which is within the noise.
+[[Image(i_o.gif, 50%, align=right, title="current to ADC outut",longdesc="current to ADC output")]]