update 20180517 2100

data/m02_adccalib_48/adccalib_48.csv

@@ -0,0 +1 @@
+/remote_media/m03/home/pi/adccalib_48.csv

data/m02_adccalib_48/processing_adccalib_48.py

@@ -1,62 +1,64 @@
 #! /usr/bin/python3
 
+import scipy.optimize as opt 
 import numpy as np
 import pandas as pd
 import matplotlib.pyplot as plt
 
-lognum = 2
-
 plt.ioff()
 plt.style.use('bmh')
-plt.figure(figsize=(11.88, 8.4))
-data = pd.read_csv("./log_poticalib_ana_{:02d}.csv".format(lognum))
+fig, axarr = plt.subplots(2,1, sharex='col',figsize=(11.88, 8.4))
+data = pd.read_csv("./adccalib_48.csv")
 
+data['Dv'] = data['v_pit48/v'] - data['v_keith/v']
 print(data)
 
-#plt.errorbar(
-#    data['time'],
-#    data['act_curr_ps'], 
-#    yerr=data['act_curr_ps']*.002, 
-#    label="Spannungsquelle Ausgang",
-#    fmt='.'
-#)
-#plt.errorbar(
-#    data['time'],
-#    data['act_curr_el']-.125, 
-#    label="Elektronische Last Eingang",
-#    fmt='.'
-#)#
-
-data['val_poti'] = data['val_poti'].map(lambda x: int(x, base=16))
-data['r_bcu/kohm'] = 2*4.7+1/(1/data['r_restheo/kohm']+1/75)
-
-data['v_bcutheo/v'] = 0.7+0.7*30.1/(data['r_bcu/kohm']+6.49)
-
-plt.errorbar(
-    data['r_bcu/kohm'],
+axarr[0].errorbar(
     data['v_keith/v'],
-    yerr=data['dv_keith/v'],
-    label="V$_{Keith,IV8A}$",
+    data['v_pit48/v'],
+    yerr=data['dv_pit48/v'],
+    label="V$_{MONITOR\_48V}$",
     fmt='.'
 )
-plt.errorbar(
-    data['r_bcu/kohm'],
-    data['v_pit/v'],
-    yerr=data['dv_pit/v)'],
-    label="V$_{PIT,IV8A}$",
+axarr[0].errorbar(
+    data['v_keith/v'],
+    data['v_ps/v'],
+    yerr=data['dv_ps/v'],
+    label="V$_{PS}$",
     fmt='.'
 )
-plt.plot(
-    data['r_bcu/kohm'],
-    data['v_bcutheo/v'],
-    label="V$_{BCU,O}$"
-)
 
-plt.xlabel('$R_{BCU,Set}$/k$\Omega$')
-plt.ylabel('V$_{1V8A}$/V')
-plt.title("PowerIt Calibration: Analog Potentiometer")
-plt.legend()
+axarr[1].errorbar(
+    data['v_keith/v'],
+    data['Dv'],
+    yerr=data['dv_pit48/v'],
+    label=" absolute Error of ADC",
+    fmt='.'
+)
+
+# fit to abs dist
+linfnc = lambda x,m,c: x*m+c
+
+pfinal, pcov = opt.curve_fit(
+    linfnc,
+    data['v_keith/v'],
+    data['Dv'],
+    p0=(.1,2.6),
+    sigma=[.5 for e in range(data['Dv'].size)]
+)
+
+print( pfinal )
+
+axarr[1].plot(
+    data['v_keith/v'],
+    data['v_keith/v']*pfinal[0]+pfinal[1]
+)
+plt.xlabel('V$_{Keith}$/k$\Omega$')
+axarr[0].set_ylabel('V$_{IN}$/V')
+axarr[0].set_title("PowerIt ADC Calibration: 48V Input")
+axarr[1].set_ylabel('$\Delta$V$_{IN}$ / V')
+axarr[0].legend()
 #-plt.savefig("2kw_direct.png")
 
 plt.tight_layout()
-plt.savefig("adccalib_{:02d}.eps".format(lognum), format='eps', dpi=1000)
+plt.savefig("adccalib_48.eps", format='eps', dpi=1000)