-
Notifications
You must be signed in to change notification settings - Fork 1
/
ums.py
3319 lines (3173 loc) · 178 KB
/
ums.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Unified measurement software UMS
# New measurement software for the electrochemical materials group, Prof. Jennifer Rupp
#
# Copyright (c) 2013 Reto Pfenninger, department of materials, D-MATL, ETH Zürich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
version = "2.19"
print "Unified measurement software UMS. Version:",str(version)
import time
import string
import struct
import os
import datetime
import sys
import numpy as np
import math
import source.pyqtgraph as pg
import source.pyqtgraph.multiprocess as mp
from source.pyqtgraph.Qt import QtGui, QtCore
from scipy.special import lambertw # for cooling curve extrapolation
def change_gpib_address(new_address):
device = open(GPIB_adapter, "w+")
device.write("++addr " + str(new_address) + "\n")
device.close()
return
pg.mkQApp()
# Create remote process with a plot window
proc = mp.QtProcess()
rpg = proc._import('source.pyqtgraph')
window_title = "Plotting"
# import all Keithley/Tektronix device drivers
from devices.tektronix_AFG2021 import tektronix_AFG2021
from devices.keithley_2601B import keithley_2601B
from devices.keithley_2602B import keithley_2602B
from devices.tektronix_AFG3021C import tektronix_AFG3021C
from devices.keithley_2612B import keithley_2612B
from devices.keithley_6517B import keithley_6517B
from devices.keithley_2700 import keithley_2700
from devices.keithley_2701 import keithley_2701
from devices.keithley_2182A import keithley_2182A
from devices.keithley_2000 import keithley_2000
from devices.keithley_2001 import keithley_2001
from devices.keithley_7001 import keithley_7001
from devices.keithley_740 import keithley_740
from devices.keithley_6220 import keithley_6220
from devices.keithley_4200gpib import keithley_4200gpib
#from devices.keithley_197A import keithley_197A
# import all oven device drivers
from devices.eurotherm_2404 import eurotherm_2404
from devices.eurotherm_2416 import eurotherm_2416
from devices.eurotherm_3216 import eurotherm_3216
from devices.eurotherm_nanodac import eurotherm_nanodac
# import power supply device drivers
from devices.tti_QL564TP import tti_QL564TP
# Import impedance bridges
from devices.gamry_R600 import gamry_R600
from devices.zahner_IM6 import zahner_IM6
from devices.solartron import solartron
# Import all flow meters
from devices.voegtlin_gsc import voegtlin_gsc
#from devices.bronkhorst_hitec import bronkhorst_hitec
#from devices.sensirion_mfc import sensirion_mfc
# Import Linkam stage controller for T-95
from devices.linkam import linkam
# Import WiTec Raman instrument alpha 300
#from devices.witec_alpha import witec_alpha
# Import data_writer-class for pretty output
from tools.data_writer import data_writer
GPIB_USB_adapter = "/dev/ttyUSB0" # here Prologix
USB = "/dev/ttyUSB0" # another synonym for Prologix
tektronix_AFG2021_ip_address = "172.31.46.10"
tektronix_AFG3021C_ip_address = "172.31.46.25"
keithley_2601B_ip_address = "172.31.46.11"
keithley_2612B_ip_address = "172.31.46.17"
keithley_2602B_ip_address = "172.31.46.18"
keithley_2701_ip_address = "172.31.46.19"
electrochem_m26_ip_address = "172.31.46.26"
electrochem_m27_ip_address = "172.31.46.27"
electrochem_m28_ip_address = "172.31.46.28"
keithley_6517B_address = 27 # GPIB Address
keithley_740_address = 14 # GPIB Address
keithley_2182A_address = 7 # GPIB Address
keithley_6220_address = 12 # GPIB Address
keithley_2000_GPIB_1_address = 1 # GPIB Address
keithley_2000_GPIB_4_address = 4 # GPIB Address
keithley_2001_GPIB_5_address = 5 # GPIB Address
keithley_2700_GPIB_3_address = 3 # GPIB Address
keithley_2700_GPIB_18_address = 18 # GPIB Address
keithley_7001_GPIB_2_address = 2 # GPIB Address
keithley_7001_GPIB_6_address = 6 # GPIB Address
#this is a python function that calls the KULT module pulsing in the electrochem library and executes set read and reset pulses
def pulsing4200(device, channel, Vset, Vreset, Vread, Vset_width, Vreset_width, Vread_width, points_per_rise, currentRng, measStart, measStop, preDatapct, postDatapct, maxpointSet, maxpointReset, maxpointRead, num_pulses, measureType, new_row = False, GUI = True):
#this function measures with the waveform the read, set and reset pulses and plots them
baseV = 0
#allocate the output arrays
dataRead = []
dataPuls = []
dataSM = []
dataSet = []
dataReset = []
dataReadS = []
dataReadR = []
if(measureType == 2):
set_size = 10000
reset_size = 10000
read_size = 10000
elif(measureType == 1):
set_size = 2
reset_size = 2
read_size = 2
elif(measureType == 0):
set_size = 2*maxpointSet
reset_size = 2*maxpointReset
read_size = 2
else:
print "Invalid measureType variable input. Please choose between 0, 1 or 2."
#set-up the GUI
if GUI:
# create an empty list in the remote process
p1 = win.addPlot(title="Voltage vs. time Set pulse")
if measureType == 2 or measureType == 0:
curve_V_t_Puls = p1.plot(pen='y')
else:
curve_V_t_Puls = p1.plot(pen = None, symbol = 'o')
p1.setLabel('left', "Voltage", units='V')
p1.setLabel('bottom', "time", units='s')
curve_V_t_Puls.setData([], _callSync='off')
p2 = win.addPlot(title="Current vs. time Set pulse")
if measureType == 2 or measureType == 0:
curve_I_t_Puls = p2.plot(pen='y')
else:
curve_I_t_Puls = p2.plot(pen = None, symbol = 'o')
p2.setLabel('left', "Current", units='A')
p2.setLabel('bottom', "time", units='s')
curve_I_t_Puls.setData([], _callSync='off')
win.nextRow()
p5 = win.addPlot(title="Voltage vs. time Reading")
if measureType == 1 or measureType == 0:
curve_V_t_Read = p5.plot(pen=None, symbol = 'o')
else:
curve_V_t_Read = p5.plot(pen = 'y')
p5.setLabel('left', "Voltage", units='V')
p5.setLabel('bottom', "time", units='s')
curve_V_t_Read.setData([], _callSync='off')
p6 = win.addPlot(title="Current vs. time Reding pulse")
if measureType == 1 or measureType == 0:
curve_I_t_Read = p6.plot(pen = None, symbol = 'o')
else:
curve_I_t_Read = p6.plot(pen = 'y')
p6.setLabel('left', "Current", units='A')
p6.setLabel('bottom', "time", units='s')
curve_I_t_Read.setData([], _callSync='off')
if new_row:
win.nextRow()
#KXCI command to access the KULT library calling page
device.access_usrlib_mode()
t_lastPulse = 0
t_lastread = 0
#loop over the number of SET-RESET pairs
for p in range(num_pulses):
#int pulsing2( int channel, double Vset, double Vreset, double Vset_width, double Vreset_width, double Vread, double Vread_width, int points_per_rise, double baseV, int measureType, double measStart, double measStop, double preDatapct, double postDatapct, int MaxNumPoints_set, int MaxNumPoints_reset, int MaxNumPoints_read,double currentMeasureRng, double *Vms, int size_Vms, double *Ims, int size_Ims, double *Ts, int size_Ts, double *Vmr, int size_Vmr, double *Imr, int size_Imr, double *Tr, int size_Tr , double *Vmsr, int size_Vmsr, double *Imsr, int size_Imsr, double *Tsr, int size_Tsr, double *Vmrr, int size_Vmrr, double *Imrr, int size_Imrr, double *Trr, int size_Trr )
exe_str = 'pulsing2txt(%d,%.4f,%.4f,%.9f,%.9f,%.4f,%.9f,%d,%.4f,%d,%.4f,%.4f,%.4f,%.4f,%d,%d,%d,%.4f, ,%d, ,%d, ,%d, ,%d, ,%d, ,%d, ,%d, ,%d, ,%d, ,%d, ,%d, ,%d)' %(channel, Vset, Vreset, Vset_width, Vreset_width, Vread, Vread_width, points_per_rise, baseV, measureType, measStart, measStop, preDatapct, postDatapct, maxpointSet, maxpointReset, maxpointRead, currentRng,set_size,set_size,set_size,reset_size,reset_size,reset_size,read_size,read_size,read_size,read_size,read_size,read_size)
#execute the kult function
device.execute_usrlib('electrochem_pulsing',exe_str)
#get the set puls
device.wait_for_meas_end()
device.wait_for_meas_end() #this function does not work for the first puls??!
time.sleep(0.1)
print "Measurement done. Retrieving data ..."
temp = device.get_csv(os.path.join(device.path2dir_temp_4200,"set.csv"))
for i in range(len(temp)):
temp[i].append(p)
dataSet.append(temp[i])
t = temp[i][2]+t_lastPulse
dataPuls.append([temp[i][0],temp[i][1],t])
t_lastPulse = t_lastPulse + temp[-1][2]
temp[:] = []
temp = device.get_csv(os.path.join(device.path2dir_temp_4200,"read1.csv"))
for i in range(len(temp)):
temp[i].append(p)
dataReadS.append(temp[i])
t = temp[i][2]+t_lastread
dataRead.append([temp[i][0],temp[i][1],t])
t_lastread = t_lastread + temp[-1][2]
temp[:] = []
temp = device.get_csv(os.path.join(device.path2dir_temp_4200,"reset.csv"))
for i in range(len(temp)):
temp[i].append(p)
dataReset.append(temp[i])
t = temp[i][2]+t_lastPulse
dataPuls.append([temp[i][0],temp[i][1],t])
t_lastPulse = t_lastPulse + temp[-1][2]
temp[:] = []
temp = device.get_csv(os.path.join(device.path2dir_temp_4200,"read2.csv"))
for i in range(len(temp)):
temp[i].append(p)
dataReadR.append(temp[i])
t = temp[i][2]+t_lastread
dataRead.append([temp[i][0],temp[i][1],t])
t_lastread = t_lastread + temp[-1][2]
temp[:] = []
if GUI:
curve_V_t_Puls.setData(x=[k[2] for k in dataPuls], y=[k[0] for k in dataPuls], _callSync='off')
curve_I_t_Puls.setData(x=[k[2] for k in dataPuls], y=[k[1] for k in dataPuls], _callSync='off')
curve_V_t_Read.setData(x=[k[2] for k in dataRead], y=[k[0] for k in dataRead], _callSync='off')
curve_I_t_Read.setData(x=[k[2] for k in dataRead], y=[k[1] for k in dataRead], _callSync='off')
return[dataSet,dataReadS,dataReset,dataReadR]
def dualSweep4200(device, channel, irange, ilimit, startv, topv, rate, points, new_row = False, GUI = True):
data_all = []
if GUI:
# create an empty list in the remote process
p1 = win.addPlot(title="Voltage vs. current")
curve_V_I = p1.plot(pen='y')
p1.setLabel('left', "Current", units='A')
p1.setLabel('bottom', "Voltage", units='V')
curve_V_I.setData([], _callSync='off')
p2 = win.addPlot(title="Voltage vs. time")
curve_V_t = p2.plot(pen='y')
p2.setLabel('left', "Voltage", units='V')
p2.setLabel('bottom', "time", units='s')
curve_V_t.setData([], _callSync='off')
p3 = win.addPlot(title="Current vs. time")
curve_I_t = p3.plot(pen='y')
p3.setLabel('left', "Current", units='A')
p3.setLabel('bottom', "time", units='s')
curve_I_t.setData([], _callSync='off')
if new_row:
win.nextRow()
device.access_usrlib_mode()
exe_str = 'DCDualSweep(SMU%d,%.4f,%.4f,%.4f,%.4f,%d,%.4f, ,%d, ,%d, ,%d)' %(channel, irange, ilimit, startv, topv, points, rate,points,points,points)
#here we send the command to execute the DCDualSweep.c module in the library of KULT
device.execute_usrlib('electrochem_cycling',exe_str)
#have to have this function twice? not sure why
device.wait_for_meas_end()
device.wait_for_meas_end()
#get the data from a file that was generated by the module in KULT - the location is in umdata - check the device file if the path is correct
temp = device.get_csv(os.path.join(device.path2dir_temp_4200,"DualSweep.csv"))
#copy the data from the file to a python file - much easier
for row in temp:
data_all.append(row)
if GUI: #this visualizes the plots
curve_I_t.setData(x=[k[2] for k in data_all], y=[k[1] for k in data_all], _callSync='off')
curve_V_t.setData(x=[k[2] for k in data_all], y=[k[0] for k in data_all], _callSync='off')
curve_V_I.setData(x=[k[0] for k in data_all], y=[k[1] for k in data_all], _callSync='off')
return data_all
def cycling4200(device, channel, startv, topv, bottomv, ramp_speed, cycles, irange_pos, irange_neg, ilimit_pos, ilimit_neg, points, new_row = False, GUI = True):
data_all = []
if GUI:
# create an empty list in the remote process
p1 = win.addPlot(title="Voltage vs. current")
curve_V_I = p1.plot(pen='y')
p1.setLabel('left', "Current", units='A')
p1.setLabel('bottom', "Voltage", units='V')
curve_V_I.setData([], _callSync='off')
p2 = win.addPlot(title="Voltage vs. time")
curve_V_t = p2.plot(pen='y')
p2.setLabel('left', "Voltage", units='V')
p2.setLabel('bottom', "time", units='s')
curve_V_t.setData([], _callSync='off')
p3 = win.addPlot(title="Current vs. time")
curve_I_t = p3.plot(pen='y')
p3.setLabel('left', "Current", units='A')
p3.setLabel('bottom', "time", units='s')
curve_I_t.setData([], _callSync='off')
if new_row:
win.nextRow()
if topv - startv > 0:
irange1 = irange_pos
ilimit1 = ilimit_pos
irange2 = irange_neg
ilimit2 = ilimit_neg
else:
irange1 = irange_neg
ilimit1 = ilimit_neg
irange2 = irange_pos
ilimit2 = ilimit_pos
ramp_speed = np.absolute(ramp_speed)
pointDual = points/(2*cycles)
last_time = 0
for i in range(cycles):
#this is the execution of the dualSweep function that calls KULT through KXCI
temp = dualSweep4200(device, channel, irange1, ilimit1, startv, topv, ramp_speed, pointDual, False, False)
for row in temp:
row[2] = row[2] + last_time
row.append(i)
data_all.append(row)
last_time = temp[-1][2]
if GUI: #this visualizes the plots
curve_I_t.setData(x=[k[2] for k in data_all], y=[k[1] for k in data_all], _callSync='off')
curve_V_t.setData(x=[k[2] for k in data_all], y=[k[0] for k in data_all], _callSync='off')
curve_V_I.setData(x=[k[0] for k in data_all], y=[k[1] for k in data_all], _callSync='off')
#this is the execution of the dualSweep function that calls KULT through KXCI
temp = dualSweep4200(device, channel, irange2, ilimit2, startv, bottomv, ramp_speed, pointDual, False, False)
for row in temp:
row[2] = row[2] + last_time
row.append(i)
data_all.append(row)
last_time = temp[-1][2]
if GUI: #this visualizes the plots
curve_I_t.setData(x=[k[2] for k in data_all], y=[k[1] for k in data_all], _callSync='off')
curve_V_t.setData(x=[k[2] for k in data_all], y=[k[0] for k in data_all], _callSync='off')
curve_V_I.setData(x=[k[0] for k in data_all], y=[k[1] for k in data_all], _callSync='off')
return data_all
def DCVoltage4200(device, channel, irange, ilimit, voltage_level, duration, new_row = False, GUI=True):
data_all = []
if GUI:
# create an empty list in the remote process
p2 = win.addPlot(title="Voltage vs. time")
curve_V_t = p2.plot(pen='y')
p2.setLabel('left', "Voltage", units='V')
p2.setLabel('bottom', "time", units='s')
curve_V_t.setData([], _callSync='off')
p3 = win.addPlot(title="Current vs. time")
curve_I_t = p3.plot(pen='y')
p3.setLabel('left', "Current", units='A')
p3.setLabel('bottom', "time", units='s')
curve_I_t.setData([], _callSync='off')
if new_row:
win.nextRow()
points = 10000
device.access_usrlib_mode()
exe_str = 'DCVoltage(SMU%d,%.4f,%.4f,%.4f,%.4f, ,%d, ,%d, ,%d)' %(channel, irange, ilimit, voltage_level, duration,points,points,points)
#here we send the command to execute the DCDualSweep.c module in the library of KULT
device.execute_usrlib('electrochem_cycling',exe_str)
#have to have this function twice? not sure why
device.wait_for_meas_end()
device.wait_for_meas_end()
#get the data from a file that was generated by the module in KULT - the location is in umdata - check the device file if the path is correct
temp = device.get_csv(os.path.join(device.path2dir_temp_4200,"DCVoltage.csv"))
#copy the data from the file to a python file - much easier
for row in temp:
data_all.append(row)
if GUI: #this visualizes the plots
curve_I_t.setData(x=[k[2] for k in data_all], y=[k[1] for k in data_all], _callSync='off')
curve_V_t.setData(x=[k[2] for k in data_all], y=[k[0] for k in data_all], _callSync='off')
return data_all
def pulse_rnone(device_smu,device_function_generator,V_peak,const_pulse_width,time_between_pulses, num_pulses,new_row=False,GUI=True):
# This function just measures the current responce to a series of voltage pulses - there is no reading voltage and the currents starts and ends at zero voltage.
device_smu.reset()
device_function_generator.reset()
device_smu.setup_current_measurement()
device_smu.turn_output_off()
data_V_t_2 = []
data_I_t_2 = []
if GUI:
if new_row:
win.nextRow()
p5 = win.addPlot(title="Voltage vs. time")
curve_V_t_2 = p5.plot(pen='y')
p5.setLabel('left', "Voltage", units='V')
p5.setLabel('bottom', "time", units='s')
curve_V_t_2.setData([], _callSync='off')
p6 = win.addPlot(title="Current vs. time")
curve_I_t_2 = p6.plot(pen='y')
p6.setLabel('left', "Current", units='A')
p6.setLabel('bottom', "time", units='s')
curve_I_t_2.setData([], _callSync='off')
device_function_generator.set_burst_on()
device_function_generator.set_burst_mode("TRIG")
device_function_generator.set_burst_number_of_cycles(1)
device_function_generator.set_trigger_input("EXT")
device_function_generator.set_function_type("PULS")
device_function_generator.set_load_impedance("INF")
device_function_generator.set_burst_trig_delay(0)
device_function_generator.set_frequency(1/(const_pulse_width))
if V_peak < 0:
device_function_generator.set_waveform_polarity("INV")
device_function_generator.set_offset_voltage(0.5*V_peak)
device_function_generator.set_low_voltage(V_peak)
device_function_generator.set_high_voltage(0)
else:
device_function_generator.set_waveform_polarity("NORM")
device_function_generator.set_offset_voltage(0.5*V_peak)
device_function_generator.set_high_voltage(V_peak)
device_function_generator.set_low_voltage(0)
device_function_generator.turn_output_on()
device_function_generator.set_pulse_duty_cycles(99.9)
pulse_end_time = 0
V_pulse = V_peak
measuring = True
if np.absolute(V_pulse) > device_function_generator.get_maximum_pulse_amplitude(): # limitation of function generator
V_pulse = device_function_generator.get_maximum_pulse_amplitude()*np.sign(V_pulse)
cycle = 1
pulse_off = True
t0 = time.time() # measurement start time
timestamp = 0
while measuring:
V = 0
if time.time()-t0 >= cycle*time_between_pulses + (cycle-1)*const_pulse_width: #gives the time to start pulsing
pulse_off = False
timestamp = time.time()-t0
device_function_generator.trigger() # apply pulse
cycle = cycle + 1
pulse_end_time = timestamp+const_pulse_width
data_V_t_2.append([timestamp,V_pulse])
data_V_t_2.append([pulse_end_time,V_pulse])
I = device_smu.get_current() #read the current from the keithley device
timestamp = time.time()-t0 #get the correct time for the current read-out
data_I_t_2.append([timestamp,I]) #writes into the plot variable the current and time (at any case)
if timestamp > pulse_end_time: # if the pulse is not ongoing we need to stop the cycle
pulse_off = True #turn the puls off
if pulse_off:
data_V_t_2.append([timestamp,V]) #this line is saving the voltage vs. time curve
if cycle == num_pulses + 1 and timestamp >= pulse_end_time + 0.8*time_between_pulses:
measuring = False
if GUI: #this visualizes the plots
curve_I_t_2.setData(x=[k[0] for k in data_I_t_2], y=[k[1] for k in data_I_t_2], _callSync='off')
curve_V_t_2.setData(x=[k[0] for k in data_V_t_2], y=[k[1] for k in data_V_t_2], _callSync='off')
device_function_generator.turn_output_off()
return [data_V_t_2,data_I_t_2] #here are the variable we are saving
def pulse_rsquare(device_smu,device_function_generator,Vset_peak,Vreset_peak,reset_pulse_width,set_pulse_width,time_between_pulses, num_pulses,time_at_zero, V_read,alternate=True,new_row=False,GUI=True):
# This function allows you to measure also the resistance during (depending on the time scale) and between pulses. - that means that there is a square reading scheme between the pulses.
# Vset_peak will be used as first pulse so make sure it is the correct polarity - need to put a sign before it
# if alternate = False just the set parameters will be used - that means Vset_peak and set_pulse_width
# be careful so far works just for positive V_read if alternate = True
if V_read < 0:
V_read = abs(V_read)
read_time = time_between_pulses - 2*time_at_zero
if read_time <= 0:
print "The time the voltage is at zero between two pulses is too long. Please decrease the time_at_zero or increase time_between_pulses."
const_pulse_width = set_pulse_width
device_smu.reset()
device_function_generator.reset()
device_smu.setup_current_measurement()
device_smu.turn_output_off()
data_cycle_R_2 = []
data_cycle_post_R_2 = []
data_V_t_2 = []
data_I_t_2 = []
if GUI:
if new_row:
win.nextRow()
p3 = win.addPlot(title="Resistance between pulses")
curve_cycle_post_R_2 = p3.plot(pen=None, symbol='o')
p3.setLabel('left', "Resistance", units='Ohm')
p3.setLabel('bottom', "Cycles", units='')
curve_cycle_post_R_2.setData([], _callSync='off')
p4 = win.addPlot(title="Resistance during pulse")
curve_cycle_R_2 = p4.plot(pen=None, symbol='o')
p4.setLabel('left', "Resistance", units='Ohm')
p4.setLabel('bottom', "Cycles", units='')
curve_cycle_R_2.setData([], _callSync='off')
p5 = win.addPlot(title="Voltage vs. time")
curve_V_t_2 = p5.plot(pen='y')
p5.setLabel('left', "Voltage", units='V')
p5.setLabel('bottom', "time", units='s')
curve_V_t_2.setData([], _callSync='off')
p6 = win.addPlot(title="Current vs. time")
curve_I_t_2 = p6.plot(pen='y')
p6.setLabel('left', "Current", units='A')
p6.setLabel('bottom', "time", units='s')
curve_I_t_2.setData([], _callSync='off')
device_function_generator.set_burst_on()
device_function_generator.set_burst_mode("TRIG")
device_function_generator.set_burst_number_of_cycles(1)
device_function_generator.set_trigger_input("EXT")
device_function_generator.set_trigger_mode("EXT")
device_function_generator.set_function_type("PULS")
device_function_generator.set_burst_trig_delay(0)
device_function_generator.set_load_impedance("INF")
device_function_generator.set_pulse_duty_cycles(99.9)
device_function_generator.set_low_voltage(0)
device_function_generator.set_pulse_period(const_pulse_width)
device_function_generator.turn_output_on()
vset_pol = np.sign(Vset_peak)
vreset_pol = np.sign(Vreset_peak)
Vs_pulse = Vset_peak
if np.absolute(Vs_pulse) > device_function_generator.get_maximum_pulse_amplitude(): # limitation of function generator
Vs_pulse = device_function_generator.get_maximum_pulse_amplitude()*vset_pol
Vr_pulse = Vreset_peak
if np.absolute(Vr_pulse) > device_function_generator.get_maximum_pulse_amplitude(): # limitation of function generator
Vr_pulse = device_function_generator.get_maximum_pulse_amplitude()*vreset_pol
pulse_end_time = 0
cycle = 1
read_average = []
read_average_post = []
pulse_off = True
read_pulse = False
measuring = True
reset = False
t0 = time.time() # measurement start time
timestamp = 0
V = 0
data_V_t_2.append([timestamp,V])
data_V_t_2.append([timestamp+5,V])
while measuring:
if cycle == 1:
pulse_cond = 5 #just wait 5 seconds before starting to pulse
elif not alternate:
pulse_cond = 5+(cycle-1)*time_between_pulses + (cycle-1)*const_pulse_width
elif (cycle%2)==0:
pulse_cond = 5+(cycle-1)*time_between_pulses + np.floor(0.5*cycle)*set_pulse_width + (np.floor(0.5*cycle)-1)*reset_pulse_width
else:
pulse_cond = 5+(cycle-1)*time_between_pulses + np.floor(0.5*cycle)*set_pulse_width + np.floor(0.5*cycle)*reset_pulse_width
if time.time()-t0 >= pulse_cond: #gives the time to start pulsing
if read_average_post: # its not empty. This means we catched an event. this variable traces everything between pulses
i_post = abs(V_read/np.average(read_average_post))
data_cycle_post_R_2.append([cycle-1,i_post])
read_average_post = []
device_function_generator.set_pulse_duty_cycles(99.9)
#since we changed the options of the function generator for the reading scheme we need to save them here again for pulsing
if cycle == 1 or not alternate:
const_pulse_width = set_pulse_width
V_pulse = Vs_pulse
if V_pulse > 0:
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_high_voltage(V_pulse)
device_function_generator.set_low_voltage(0)
device_function_generator.set_waveform_polarity("NORM")
device_function_generator.set_pulse_period(const_pulse_width)
else:
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_high_voltage(0)
device_function_generator.set_low_voltage(V_pulse)
device_function_generator.set_waveform_polarity("INV")
device_function_generator.set_pulse_period(const_pulse_width)
else:
if reset:
V_pulse = Vr_pulse
const_pulse_width = reset_pulse_width
else:
V_pulse = Vs_pulse
const_pulse_width = set_pulse_width
if V_pulse > 0:
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_high_voltage(V_pulse)
device_function_generator.set_low_voltage(0)
device_function_generator.set_waveform_polarity("NORM")
device_function_generator.set_pulse_period(const_pulse_width)
else:
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_low_voltage(V_pulse)
device_function_generator.set_high_voltage(0)
device_function_generator.set_waveform_polarity("INV")
device_function_generator.set_pulse_period(const_pulse_width)
pulse_off = False
timestamp = time.time()-t0
reset = not(reset) #change reset to einther True or False - switch the pulse
pulse_end_time = timestamp+const_pulse_width
data_V_t_2.append([timestamp,V_pulse])
data_V_t_2.append([pulse_end_time,V_pulse])
cycle = cycle + 1
device_function_generator.trigger() # apply pulse
I = device_smu.get_current() #read the current from the keithley device
timestamp = time.time()-t0 #get the correct time for the current read-out (this is under no if statement - it is read every time)
data_I_t_2.append([timestamp,I]) #writes into the plot variable the current and time (at any case)
if timestamp < pulse_end_time and cycle != 1: #if the pulse is ongoing now we save the current value in read_average
read_average.append(I)
elif not pulse_off: #we turn on the pulse_off variable so we know that we are in between the pulses
if read_average: # its not empty. This means we catched an event
i = abs(V_pulse/np.average(read_average)) #this actually calculates the resistance but is called i
data_cycle_R_2.append([cycle-1,i]) #this saves the resistance
#here we iterate all the variables since we came to an end of an pulse
read_average = []
pulse_off = True #turn the pulse off
read_pulse = True #this is a variable to control the reading pulses - set it just once to true between the pulses
if pulse_off and cycle != 1:
#timestamp = time.time()-t0 #get the correct time
if timestamp >= pulse_end_time + time_at_zero and read_pulse: #now we trigger the reading pulse
device_function_generator.set_pulse_duty_cycles(99.9)
if V_pulse > 0 or alternate:
device_function_generator.set_high_voltage(V_read)
device_function_generator.set_low_voltage(0)
device_function_generator.set_offset_voltage(0.5*V_read)
device_function_generator.set_waveform_polarity("NORM")
data_V_t_2.append([timestamp, V_read])
data_V_t_2.append([timestamp + read_time, V_read])
else:
device_function_generator.set_high_voltage(0)
device_function_generator.set_low_voltage(-V_read)
device_function_generator.set_offset_voltage(-0.5*V_read)
device_function_generator.set_waveform_polarity("INV")
data_V_t_2.append([timestamp, -V_read])
data_V_t_2.append([timestamp + read_time, -V_read])
device_function_generator.set_pulse_period(read_time)
read_pulse = False #now turn the read pulse off so we trigger it just once
device_function_generator.trigger() # apply reading pulse
if pulse_end_time + time_at_zero < timestamp < pulse_end_time + time_at_zero + read_time: #if the read pulse is ongoing then save the current
read_average_post.append(I)
else:
data_V_t_2.append([timestamp,V]) #this line is saving the voltage vs. time curve
if timestamp >= pulse_end_time + 0.9*time_between_pulses:
if cycle > num_pulses:
measuring = False
if GUI: #this visualizes the plots
curve_I_t_2.setData(x=[k[0] for k in data_I_t_2], y=[k[1] for k in data_I_t_2], _callSync='off')
curve_cycle_post_R_2.setData(x=[k[0] for k in data_cycle_post_R_2], y=[k[1] for k in data_cycle_post_R_2], _callSync='off')
curve_cycle_R_2.setData(x=[k[0] for k in data_cycle_R_2], y=[k[1] for k in data_cycle_R_2], _callSync='off')
curve_V_t_2.setData(x=[k[0] for k in data_V_t_2], y=[k[1] for k in data_V_t_2], _callSync='off')
device_function_generator.turn_output_off()
return [data_V_t_2,data_I_t_2,data_cycle_R_2,data_cycle_post_R_2] #here are the variables we are saving
def pulse_rbipolar(device_smu,device_function_generator,Vset_peak, Vreset_peak,set_pulse_width,reset_pulse_width,time_between_pulses, num_pulses,time_at_zero, V_read, alternate=True, new_row=False,GUI=True):
# This function allows you to measure also the resistance during (depending on the time scale) and between pulses.
# There is a bipolar pulse reading scheme between the pulses. This is an advantage over a constant reading scheme since the device will not be disturbed.
# No resistence will be measured during the time at zero. This is just an option to leave the current to equilibrate.
if V_read < 0:
V_read = abs(V_read)
read_time = time_between_pulses - 2*time_at_zero
if read_time <= 0:
print "There is not enough time to implement a reading scheme. Please decrease the time_at_zero or/and increase time_between_pulses."
const_pulse_width = set_pulse_width
device_smu.reset()
device_function_generator.reset()
device_smu.setup_current_measurement()
device_smu.turn_output_off()
data_cycle_R_2 = []
data_cycle_post_R_2 = []
data_V_t_2 = []
data_I_t_2 = []
if GUI:
if new_row:
win.nextRow()
p3 = win.addPlot(title="Resistance between pulses.")
curve_cycle_post_R_2 = p3.plot(pen=None, symbol='o')
p3.setLabel('left', "Resistance", units='Ohm')
p3.setLabel('bottom', "Cycles", units='')
curve_cycle_post_R_2.setData([], _callSync='off')
p4 = win.addPlot(title="Resistance during pulse")
curve_cycle_R_2 = p4.plot(pen=None, symbol='o')
p4.setLabel('left', "Resistance", units='Ohm')
p4.setLabel('bottom', "Cycles", units='')
curve_cycle_R_2.setData([], _callSync='off')
p5 = win.addPlot(title="Voltage vs. time")
curve_V_t_2 = p5.plot(pen='y')
p5.setLabel('left', "Voltage", units='V')
p5.setLabel('bottom', "time", units='s')
curve_V_t_2.setData([], _callSync='off')
p6 = win.addPlot(title="Current vs. time")
curve_I_t_2 = p6.plot(pen='y')
p6.setLabel('left', "Current", units='A')
p6.setLabel('bottom', "time", units='s')
curve_I_t_2.setData([], _callSync='off')
device_function_generator.set_burst_on()
device_function_generator.set_burst_mode("TRIG")
device_function_generator.set_burst_number_of_cycles(1)
device_function_generator.set_trigger_input("EXT")
device_function_generator.set_trigger_mode("EXT")
device_function_generator.set_function_type("PULS")
device_function_generator.set_burst_trig_delay(0)
device_function_generator.set_low_voltage(0)
device_function_generator.set_load_impedance("INF")
device_function_generator.set_pulse_duty_cycles(99.9)
device_function_generator.set_pulse_period(const_pulse_width)
device_function_generator.turn_output_on()
pulse_end_time = 0
Vs_pulse = Vset_peak
if np.absolute(Vs_pulse) > device_function_generator.get_maximum_pulse_amplitude(): # limitation of function generator
Vs_pulse = device_function_generator.get_maximum_pulse_amplitude()*np.sign(Vs_pulse)
Vr_pulse = Vreset_peak
if np.absolute(Vr_pulse) > device_function_generator.get_maximum_pulse_amplitude(): # limitation of function generator
Vr_pulse = device_function_generator.get_maximum_pulse_amplitude()*np.sign(Vr_pulse)
cycle = 1
read_average = []
read_average_post = []
pulse_off = True
read_pulse_first = False
read_pulse_second = False
reset = False
t0 = time.time() # measurement start time
timestamp = 0
measuring = True
data_V_t_2.append([timestamp,V])
data_V_t_2.append([timestamp+5,V])
while measuring:
V = 0
if cycle == 1:
pulse_cond = 5 #just wait 5 seconds before starting to pulse
elif not alternate:
pulse_cond = cycle*time_between_pulses + (cycle-1)*const_pulse_width
elif (cycle%2)==0:
pulse_cond = cycle*time_between_pulses + np.floor(0.5*cycle)*set_pulse_width + (np.floor(0.5*cycle)-1)*reset_pulse_width
else:
pulse_cond = cycle*time_between_pulses + np.floor(0.5*cycle)*set_pulse_width + np.floor(0.5*cycle)*reset_pulse_width
if time.time()-t0 >= pulse_cond: #gives the time to start pulsing
if read_average_post: # its not empty. This means we catched an event.
i_post = abs(V_read/np.average(read_average_post))
data_cycle_post_R_2.append([cycle-1,i_post])
read_average_post = []
device_function_generator.set_pulse_duty_cycles(99.9)
#since we changed the options of the function generator for the reading scheme we need to set them here again
if cycle == 1 or not alternate:
const_pulse_width = set_pulse_width
V_pulse = Vs_pulse
if V_pulse > 0:
device_function_generator.set_high_voltage(V_pulse)
device_function_generator.set_low_voltage(0)
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_waveform_polarity("NORM")
device_function_generator.set_pulse_period(const_pulse_width)
else:
device_function_generator.set_high_voltage(0)
device_function_generator.set_low_voltage(V_pulse)
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_waveform_polarity("INV")
device_function_generator.set_pulse_period(const_pulse_width)
else:
if reset:
V_pulse = Vr_pulse
const_pulse_width = reset_pulse_width
else:
V_pulse = Vs_pulse
const_pulse_width = set_pulse_width
if V_pulse < 0:
device_function_generator.set_high_voltage(0)
device_function_generator.set_low_voltage(V_pulse)
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_waveform_polarity("INV")
device_function_generator.set_pulse_period(const_pulse_width)
else:
device_function_generator.set_high_voltage(V_pulse)
device_function_generator.set_low_voltage(0)
device_function_generator.set_offset_voltage(0.5*V_pulse)
device_function_generator.set_waveform_polarity("NORM")
device_function_generator.set_pulse_period(const_pulse_width)
pulse_off = False
timestamp = time.time()-t0
device_function_generator.trigger() # apply pulse
reset = not(reset)
cycle = cycle+1 #append cycle count
data_V_t_2.append([timestamp,V_pulse])
pulse_end_time = timestamp+const_pulse_width
data_V_t_2.append([pulse_end_time,V_pulse])
I = device_smu.get_current() #read the current from the keithley device
timestamp = time.time()-t0 #get the correct time (this is under no if statement - it is read every time)
data_I_t_2.append([timestamp,I]) #writes into the plot variable the current and time (at any case)
if timestamp < pulse_end_time and cycle != 1: #if the pulse is ongoing now we save the current value in read_average
read_average.append(I)
elif not pulse_off: #we turn on the pulse_off variable so we know that we are in between the pulses
if read_average: # its not empty. This means we catched an event
i = float(V_pulse)/np.average(read_average) #this actually calculates the resistance but is called i
data_cycle_R_2.append([cycle,i]) #this saves the resistance
#here we set the Boolean variables since we came to an end of an pulse
read_average = []
pulse_off = True #turn the pulse_off variable on - now we are between two pulses
read_pulse_second = True #this is a variable to control the reading pulses - set it just once to true between the pulses
read_pulse_first = True
if pulse_off and cycle != 1: #here we are in between the pulses and we employ the whole reading scheme
start_read = pulse_end_time + time_at_zero
#here we set the function generator to the correct reading parameters
device_function_generator.set_pulse_period(0.5*read_time)
device_function_generator.set_pulse_duty_cycles(99.9)
#these are conditions for triggering
#they will just be called once (therefore the read_pulse_first and read_puls_second variables)
if timestamp >= start_read and read_pulse_first: #condition to trigger the first part of the bipolar reading pulse
device_function_generator.set_offset_voltage(0.5*V_read)
device_function_generator.set_waveform_polarity("NORM")
device_function_generator.set_low_voltage(0)
device_function_generator.set_high_voltage(V_read)
device_function_generator.trigger() # apply pulse
read_pulse_first = False
data_V_t_2.append([timestamp, V_read])
data_V_t_2.append([timestamp + 0.5*read_time, V_read])
elif timestamp >= start_read + 0.5*read_time and read_pulse_second: #condition to trigger the second part of the bipolar reading pulse
device_function_generator.set_offset_voltage(-0.5*V_read)
device_function_generator.set_waveform_polarity("INV")
device_function_generator.set_high_voltage(0)
device_function_generator.set_low_voltage(-V_read)
device_function_generator.trigger() # apply pulse
read_pulse_second = False #now turn the read_pulse_second off so we trigger it just once
data_V_t_2.append([timestamp, -V_read])
data_V_t_2.append([timestamp + 0.5*read_time, -V_read])
#now that we triggered the pulses we can record the data (I)
#the current will be recorded at all times (not just once)
timestamp = time.time()-t0
if start_read <= timestamp <= start_read + read_time:
read_average_post.append(abs(I))
else:
data_V_t_2.append([timestamp,V]) #V is actually just 0 - this saves the time_at_zero voltage
if cycle == num_pulses+1 and timestamp >= pulse_end_time + 1.8*time_at_zero + read_time:
measuring = False
if GUI: #this visualizes the plots
curve_I_t_2.setData(x=[k[0] for k in data_I_t_2], y=[k[1] for k in data_I_t_2], _callSync='off')
curve_cycle_post_R_2.setData(x=[k[0] for k in data_cycle_post_R_2], y=[k[1] for k in data_cycle_post_R_2], _callSync='off')
curve_cycle_R_2.setData(x=[k[0] for k in data_cycle_R_2], y=[k[1] for k in data_cycle_R_2], _callSync='off')
curve_V_t_2.setData(x=[k[0] for k in data_V_t_2], y=[k[1] for k in data_V_t_2], _callSync='off')
device_function_generator.turn_output_off()
return [data_V_t_2,data_I_t_2,data_cycle_R_2,data_cycle_post_R_2_plus, data_cycle_post_R_2_minus] #here are the variable we are saving
def preforming_ramp(device,start_voltage,ramp_speed_1,top_voltage,hold_time,ramp_speed_2,end_voltage,compliance_current=0,new_row=False, GUI=True):
device.reset()
device.setup_current_measurement(1)
if top_voltage>100:
device.set_voltage_range(1000)
else:
device.set_voltage_range(100)
if compliance_current is not 0:
device.set_compliance_current(compliance_current)
device.set_voltage(start_voltage)
device.turn_output_on()
device.init()
data_V_I = []
data_V_t = []
data_I_t = []
if GUI:
# create an empty list in the remote process
p1 = win.addPlot(title="Voltage vs. current")
curve_V_I = p1.plot(pen='y')
p1.setLabel('left', "Current", units='A')
p1.setLabel('bottom', "Voltage", units='V')
curve_V_I.setData(data_V_I, _callSync='off')
p2 = win.addPlot(title="Voltage vs. time")
curve_V_t = p2.plot(pen='y')
p2.setLabel('left', "Voltage", units='V')
p2.setLabel('bottom', "time", units='s')
curve_V_t.setData(data_V_t, _callSync='off')
p3 = win.addPlot(title="Current vs. time")
curve_I_t = p3.plot(pen='y')
p3.setLabel('left', "Current", units='A')
p3.setLabel('bottom', "time", units='s')
curve_I_t.setData(data_I_t, _callSync='off')
if new_row:
win.nextRow()
first_step_time = np.absolute(top_voltage-start_voltage)/np.absolute(ramp_speed_1)
v0 = start_voltage
t0 = time.time() # measurement start time
old_time = 0 # to remember the timestamp in the (t-1) cycle. You need to find out the time for each loop
timestamp = 0
keithley_time0 = 0 # Keithley saves also a time with each measurement
first_time = True
while True:
I = device.get_value()
V_actual = device.get_voltage()
if first_time:
keithley_time0 = I[1]
first_time = False
keithley_time = I[1]-keithley_time0
old_time = timestamp
device.set_voltage(v0)
timestamp = time.time()-t0
if timestamp < first_step_time:
delta_V = ramp_speed_1*(timestamp-old_time)*float(old_time>0)
elif timestamp >= first_step_time and timestamp-first_step_time < hold_time:
delta_V=0.0
if v0 is not top_voltage: # Did we reach the hold voltage? Adjust if not so...
delta_V = top_voltage-v0
else:
delta_V = ramp_speed_2*(timestamp-old_time)*float(old_time>0)
if (v0 < end_voltage and ramp_speed_2 < 0) or (v0 > end_voltage and ramp_speed_2 > 0):
device.set_voltage(end_voltage)
break
v0=v0+delta_V
if V_actual is None: # Means we are working on keithley_6517B
V_actual = v0
else: # Means we are working on keithley_26xxB
keithley_time = timestamp
data_I_t.append([I[0],keithley_time])
data_V_I.append([V_actual,I[0]])
data_V_t.append([V_actual,timestamp])
if GUI:
curve_I_t.setData(x=[k[1] for k in data_I_t], y=[k[0] for k in data_I_t], _callSync='off')
curve_V_I.setData(x=[k[0] for k in data_V_I], y=[k[1] for k in data_V_I], _callSync='off')
curve_V_t.setData(x=[k[1] for k in data_V_t], y=[k[0] for k in data_V_t], _callSync='off')
device.turn_output_off()
return [data_V_I,data_V_t,data_I_t]
def preforming_ramp_with_current_hold_time(device,start_voltage,ramp_speed_1,top_voltage,hold_time,ramp_speed_2,end_voltage,compliance_current=0,trigger_current=0,trigger_hold_time=0,new_row=False,GUI=True):
device.reset()
device.setup_current_measurement(1)
if top_voltage>100:
device.set_voltage_range(1000)
else:
device.set_voltage_range(100)
if compliance_current is not 0:
device.set_compliance_current(compliance_current)
if trigger_current is not 0:
if trigger_current >= compliance_current:
print "the trigger_current you specified will never be reached since it is bigger than the allowed maximum current in compliance_current"
return
device.set_voltage(start_voltage)
device.turn_output_on()
device.init()
data_V_I = []
data_V_t = []
data_I_t = []
if GUI:
# create an empty list in the remote process
p1 = win.addPlot(title="Voltage vs. current")
curve_V_I = p1.plot(pen='y')
p1.setLabel('left', "Current", units='A')
p1.setLabel('bottom', "Voltage", units='V')
curve_V_I.setData(data_V_I, _callSync='off')
p2 = win.addPlot(title="Voltage vs. time")
curve_V_t = p2.plot(pen='y')
p2.setLabel('left', "Voltage", units='V')
p2.setLabel('bottom', "time", units='s')
curve_V_t.setData(data_V_t, _callSync='off')
p3 = win.addPlot(title="Current vs. time")
curve_I_t = p3.plot(pen='y')
p3.setLabel('left', "Current", units='A')
p3.setLabel('bottom', "time", units='s')
curve_I_t.setData(data_I_t, _callSync='off')
if new_row:
win.nextRow()
first_step_time = np.absolute(top_voltage-start_voltage)/np.absolute(ramp_speed_1)
v0 = start_voltage
t0 = time.time() # measurement start time
old_time = 0 # to remember the timestamp in the (t-1) cycle. You need to find out the time for each loop
timestamp = 0
keithley_time0 = 0 # Keithley saves also a time with each measurement
triggered_remaining_time = 0 # this counter time tells you how many seconds have to pass till we will be done
first_time = True
trigger_armed = False
while True: