implemented new I-V measurement

alsmost nothing is available to the user and data are exported to csv file

implemented new I-V measurement
d0d9abf8 · JupyterHub User · ee97361d · d0d9abf8 · d0d9abf8 · d0d9abf8
Commit d0d9abf8 authored 1 year ago by JupyterHub User
--- a/hp4155/.ipynb_checkpoints/HP4155a_class-checkpoint.ipynb
+++ b/hp4155/.ipynb_checkpoints/HP4155a_class-checkpoint.ipynb
--- a/hp4155/.ipynb_checkpoints/measurements-checkpoint.py
+++ b/hp4155/.ipynb_checkpoints/measurements-checkpoint.py
--- a/hp4155/.ipynb_checkpoints/results 2023-08-28 09:11:29-checkpoint.csv
+++ b/hp4155/.ipynb_checkpoints/results 2023-08-28 09:11:29-checkpoint.csv
+,Voltage(V),Current(A)
+0,0.0,-2.0172e-07
+1,0.05,1.7837e-05
+2,0.1,3.7577e-05
+3,0.15,6.0445e-05
+4,0.2,8.5833e-05
+5,0.25,0.000113797
+6,0.3,0.00014604
+7,0.35,0.0001823
+8,0.4,0.00022479
+9,0.45,0.00027261
+10,0.5,0.00032461
+11,0.55,0.00038161
+12,0.6,0.00044615
+13,0.65,0.00051651
+14,0.7,0.00059047
+15,0.75,0.00066731
+16,0.8,0.00075451
+17,0.85,0.0008448
+18,0.9,0.00093602
+19,0.95,0.00102376
+20,1.0,0.0011258
+21,1.05,0.0012281
+22,1.1,0.0013295
+23,1.15,0.0014353
+24,1.2,0.0015563
+25,1.25,0.0016701
+26,1.3,0.0017803
+27,1.35,0.0018951
+28,1.4,0.002029
+29,1.45,0.0021518
+30,1.5,0.0022691
+31,1.55,0.0023878
+32,1.6,0.0025273
+33,1.65,0.0026616
+34,1.7,0.0027876
+35,1.75,0.002916
+36,1.8,0.0030592
+37,1.85,0.0032063
+38,1.9,0.0033439
+39,1.95,0.003475
+40,2.0,0.0036308
+41,2.05,0.0037965
+42,2.1,0.0039297
+43,2.15,0.0040698
+44,2.2,0.0042341
+45,2.25,0.004404
+46,2.3,0.0045565
+47,2.35,0.0046994
+48,2.4,0.0048693
+49,2.45,0.0050476
+50,2.5,0.0052095
+51,2.55,0.0053543
+52,2.6,0.0055203
+53,2.65,0.0057068
+54,2.7,0.0058664
+55,2.75,0.0060137
+56,2.8,0.0061811
+57,2.85,0.0063717
+58,2.9,0.0065344
+59,2.95,0.0066796
+60,3.0,0.0068391
+61,3.05,0.0070318
+62,3.1,0.0072005
+63,3.15,0.0073433
+64,3.2,0.0074938
+65,3.25,0.0076875
+66,3.3,0.0078528
+67,3.35,0.0079939
+68,3.4,0.0081331
+69,3.45,0.008324
+70,3.5,0.0084877
+71,3.55,0.0086322
+72,3.6,0.0087642
+73,3.65,0.0089491
+74,3.7,0.0091169
+75,3.75,0.0092587
+76,3.8,0.0094001
+77,3.85,0.0095756
+78,3.9,0.0097471
+79,3.95,0.0098836
+80,4.0,0.0100007
+81,4.05,0.0101695
+82,4.1,0.0103403
+83,4.15,0.0104739
+84,4.2,0.0105835
+85,4.25,0.010747
+86,4.3,0.0109165
+87,4.35,0.0110492
+88,4.4,0.0111549
+89,4.45,0.0113035
+90,4.5,0.011437
+91,4.55,0.011582
+92,4.6,0.011752
+93,4.65,0.011885
+94,4.7,0.01199
+95,4.75,0.012118
+96,4.8,0.012294
+97,4.85,0.012424
+98,4.9,0.012515
+99,4.95,0.012631
+100,5.0,0.012812
+101,5.05,0.012943
+102,5.1,0.013039
+103,5.15,0.013146
+104,5.2,0.013317
+105,5.25,0.01345
+106,5.3,0.013551
+107,5.35,0.013645
+108,5.4,0.013811
+109,5.45,0.01394
+110,5.5,0.014039
+111,5.55,0.014122
+112,5.6,0.014289
+113,5.65,0.014246
+114,5.7,0.014127
+115,5.75,0.014193
+116,5.8,0.014335
+117,5.85,0.014895
+118,5.9,0.014997
+119,5.95,0.015063
+120,6.0,0.01521
+121,6.05,0.01535
+122,6.1,0.015448
+123,6.15,0.015513
+124,6.2,0.015641
+125,6.25,0.015792
+126,6.3,0.015895
+127,6.35,0.015949
+128,6.4,0.016056
+129,6.45,0.016203
+130,6.5,0.016302
+131,6.55,0.016362
+132,6.6,0.016492
+133,6.65,0.016636
+134,6.7,0.016745
+135,6.75,0.016774
+136,6.8,0.016874
+137,6.85,0.017036
+138,6.9,0.017124
+139,6.95,0.017172
+140,7.0,0.017251
+141,7.05,0.01741
+142,7.1,0.017513
+143,7.15,0.017609
+144,7.2,0.017646
+145,7.25,0.017794
+146,7.3,0.017869
+147,7.35,0.017955
+148,7.4,0.01802
+149,7.45,0.018137
+150,7.5,0.018244
+151,7.55,0.018323
+152,7.6,0.018396
+153,7.65,0.018502
+154,7.7,0.018611
+155,7.75,0.018682
+156,7.8,0.018713
+157,7.85,0.018826
+158,7.9,0.018934
+159,7.95,0.019005
+160,8.0,0.019042
+161,8.05,0.019156
+162,8.1,0.019268
+163,8.15,0.019344
+164,8.2,0.019375
+165,8.25,0.019478
+166,8.3,0.019604
+167,8.35,0.019675
+168,8.4,0.019701
+169,8.45,0.019793
+170,8.5,0.019926
+171,8.55,0.019996
+172,8.6,0.020026
+173,8.65,0.020103
+174,8.7,0.020242
+175,8.75,0.020314
+176,8.8,0.020345
+177,8.85,0.020408
+178,8.9,0.020549
+179,8.95,0.020624
+180,9.0,0.021077
+181,9.05,0.020751
+182,9.1,0.020862
+183,9.15,0.02093
+184,9.2,0.020973
+185,9.25,0.021014
+186,9.3,0.021131
+187,9.35,0.021219
+188,9.4,0.021269
+189,9.45,0.021204
+190,9.5,0.02139
+191,9.55,0.02151
+192,9.6,0.021572
+193,9.65,0.02159
+194,9.7,0.021701
+195,9.75,0.021798
+196,9.8,0.021869
+197,9.85,0.021896
+198,9.9,0.021991
+199,9.95,0.022039
+200,10.0,0.022167
--- a/hp4155/I-V_new.ipynb
+++ b/hp4155/I-V_new.ipynb
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "8b118521-4ded-405e-95fd-3c5642ef8585",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import measurements\n",
+    "from measurements import *"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "2d031d5e-a683-4def-8bc0-9008e5ae87eb",
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "ValueError",
+     "evalue": "Could not locate a VISA implementation. Install either the IVI binary or pyvisa-py.",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
+      "\u001b[0;32m/tmp/ipykernel_16728/3105077528.py\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      3\u001b[0m \u001b[0mstop\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m10\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      4\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mI_V_Measurement\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mstart\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mstop\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mstep\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "\u001b[0;32m~/cst/labcode/hp4155/measurements.py\u001b[0m in \u001b[0;36mI_V_Measurement\u001b[0;34m(start, stop, step)\u001b[0m\n\u001b[1;32m      9\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mI_V_Measurement\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mstart\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mstop\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mstep\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     10\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 11\u001b[0;31m     \u001b[0mdevice\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mmodule\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mHP4155a\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'GPIB0::17::INSTR'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     12\u001b[0m     \u001b[0mdevice\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0minst\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mwrite\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\":PAGE:MEAS\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m     13\u001b[0m     \u001b[0mdevice\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0minst\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mwrite\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\":PAGE:CHAN:MODE SWEEP\"\u001b[0m\u001b[0;34m)\u001b[0m \u001b[0;31m#go to sweep page and prepare sweep measurement\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;32m~/cst/labcode/hp4155/module.py\u001b[0m in \u001b[0;36m__init__\u001b[0;34m(self, adress)\u001b[0m\n\u001b[1;32m      5\u001b[0m     \u001b[0;32mdef\u001b[0m \u001b[0m__init__\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mself\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0madress\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      6\u001b[0m         \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0madress\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0madress\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 7\u001b[0;31m         \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mrm\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mpyvisa\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mResourceManager\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      8\u001b[0m         \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0minst\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mrm\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mopen_resource\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0madress\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      9\u001b[0m         \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0minst\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mtimeout\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;32mNone\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;32m/opt/conda/lib/python3.9/site-packages/pyvisa/highlevel.py\u001b[0m in \u001b[0;36m__new__\u001b[0;34m(cls, visa_library)\u001b[0m\n\u001b[1;32m   2990\u001b[0m         \"\"\"\n\u001b[1;32m   2991\u001b[0m         \u001b[0;32mif\u001b[0m \u001b[0;32mnot\u001b[0m \u001b[0misinstance\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mvisa_library\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mVisaLibraryBase\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 2992\u001b[0;31m             \u001b[0mvisa_library\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mopen_visa_library\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mvisa_library\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   2993\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   2994\u001b[0m         \u001b[0;32mif\u001b[0m \u001b[0mvisa_library\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mresource_manager\u001b[0m \u001b[0;32mis\u001b[0m \u001b[0;32mnot\u001b[0m \u001b[0;32mNone\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;32m/opt/conda/lib/python3.9/site-packages/pyvisa/highlevel.py\u001b[0m in \u001b[0;36mopen_visa_library\u001b[0;34m(specification)\u001b[0m\n\u001b[1;32m   2897\u001b[0m             \u001b[0mwrapper\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m\"ivi\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   2898\u001b[0m         \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 2899\u001b[0;31m             \u001b[0mwrapper\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0m_get_default_wrapper\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m   2900\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   2901\u001b[0m     \u001b[0mcls\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mget_wrapper_class\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mwrapper\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
+      "\u001b[0;32m/opt/conda/lib/python3.9/site-packages/pyvisa/highlevel.py\u001b[0m in \u001b[0;36m_get_default_wrapper\u001b[0;34m()\u001b[0m\n\u001b[1;32m   2856\u001b[0m     \u001b[0;32mexcept\u001b[0m \u001b[0mValueError\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   2857\u001b[0m         \u001b[0mlogger\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mdebug\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Did not find pyvisa-py package\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m-> 2858\u001b[0;31m     raise ValueError(\n\u001b[0m\u001b[1;32m   2859\u001b[0m         \u001b[0;34m\"Could not locate a VISA implementation. Install either the IVI binary or pyvisa-py.\"\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m   2860\u001b[0m     )\n",
+      "\u001b[0;31mValueError\u001b[0m: Could not locate a VISA implementation. Install either the IVI binary or pyvisa-py."
+     ]
+    }
+   ],
+   "source": [
+    "start = 0\n",
+    "step = 0.05\n",
+    "stop = 10\n",
+    "\n",
+    "I_V_Measurement(start,stop,step)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "2bcfdbc2-8b0a-4d41-b8bf-fca0da5b1e08",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.7"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
+%% Cell type:code id:8b118521-4ded-405e-95fd-3c5642ef8585 tags:
+
+``` python
+import measurements
+from measurements import *
+```
+
+%% Cell type:code id:2d031d5e-a683-4def-8bc0-9008e5ae87eb tags:
+
+``` python
+start = 0
+step = 0.05
+stop = 10
+
+I_V_Measurement(start,stop,step)
+```
+
+%% Output
+
+    ---------------------------------------------------------------------------
+    ValueError                                Traceback (most recent call last)
+    /tmp/ipykernel_16728/3105077528.py in <module>
+          3 stop = 10
+          4
+    ----> 5 I_V_Measurement(start,stop,step)
+
+    ~/cst/labcode/hp4155/measurements.py in I_V_Measurement(start, stop, step)
+          9 def I_V_Measurement(start,stop,step):
+         10
+    ---> 11     device = module.HP4155a('GPIB0::17::INSTR')
+         12     device.inst.write(":PAGE:MEAS")
+         13     device.inst.write(":PAGE:CHAN:MODE SWEEP") #go to sweep page and prepare sweep measurement
+    ~/cst/labcode/hp4155/module.py in __init__(self, adress)
+          5     def __init__(self,adress):
+          6         self.adress = adress
+    ----> 7         self.rm = pyvisa.ResourceManager()
+          8         self.inst = self.rm.open_resource(adress)
+          9         self.inst.timeout = None
+    /opt/conda/lib/python3.9/site-packages/pyvisa/highlevel.py in __new__(cls, visa_library)
+       2990         """
+       2991         if not isinstance(visa_library, VisaLibraryBase):
+    -> 2992             visa_library = open_visa_library(visa_library)
+       2993
+       2994         if visa_library.resource_manager is not None:
+    /opt/conda/lib/python3.9/site-packages/pyvisa/highlevel.py in open_visa_library(specification)
+       2897             wrapper = "ivi"
+       2898         else:
+    -> 2899             wrapper = _get_default_wrapper()
+       2900
+       2901     cls = get_wrapper_class(wrapper)
+    /opt/conda/lib/python3.9/site-packages/pyvisa/highlevel.py in _get_default_wrapper()
+       2856     except ValueError:
+       2857         logger.debug("Did not find pyvisa-py package")
+    -> 2858     raise ValueError(
+       2859         "Could not locate a VISA implementation. Install either the IVI binary or pyvisa-py."
+       2860     )
+    ValueError: Could not locate a VISA implementation. Install either the IVI binary or pyvisa-py.
+
+%% Cell type:code id:2bcfdbc2-8b0a-4d41-b8bf-fca0da5b1e08 tags:
+
+``` python
+```
--- a/hp4155/__pycache__/measurements.cpython-39.pyc
+++ b/hp4155/__pycache__/measurements.cpython-39.pyc
--- a/hp4155/__pycache__/module.cpython-39.pyc
+++ b/hp4155/__pycache__/module.cpython-39.pyc
--- a/hp4155/measurements.py
+++ b/hp4155/measurements.py
+# this is a python file that minimizes the amount of code seen to the user
+
+import module
+import matplotlib.pyplot as plt
+import pandas as pd
+from datetime import datetime
+
+
+def I_V_Measurement(start,stop,step):
+    
+    device = module.HP4155a('GPIB0::17::INSTR')
+    device.inst.write(":PAGE:MEAS")
+    device.inst.write(":PAGE:CHAN:MODE SWEEP") #go to sweep page and prepare sweep measurement
+    
+    #setup sweep
+    device.inst.write(":PAGE:CHAN:MODE SWEEP") #go to sweep page and prepare sweep measurement
+
+    #smu2 and smu4 are disabled
+    device.smu_disable_sweep(2)
+    device.smu_disable_sweep(4)
+
+    #smu1 is constant and common
+    device.smu_mode_meas(1,'COMM')
+    device.smu_function_sweep(1,'CONS')
+
+    #smu3 is VAR1 and V
+    device.smu_mode_meas(3,'V')
+    device.smu_function_sweep(3,'VAR1')
+
+    #define start-step-stop
+    device.start_value_sweep(start)
+    device.step_sweep(step)
+    device.stop_value_sweep(stop)
+    
+    #start measurement
+    device.single_measurement()
+    while device.operation_completed() == False:
+        pass
+    
+    voltage_values = device.return_data('V3')
+    current_values = device.return_data('I3')
+    
+    # show plot
+    plt.plot(voltage_values,current_values)
+    plt.show()
+    
+    #export data to csv file
+    #add title to the results
+    
+    header = ['Voltage(V)', 'Current(A)']
+
+    data = {header[0]:voltage_values,header[1]:current_values}
+    df = pd.DataFrame(data)
+    date = str(datetime.today().replace(microsecond=0))
+    
+    print(df)
+    
+    #exporting the data frame in an excel file
+    file_name = 'results '+date+'.csv'
+    df.to_csv(file_name)
+    
+    del device
\ No newline at end of file
--- a/hp4155/module.py
+++ b/hp4155/module.py
@@ -154,3 +154,20 @@ class HP4155a(object):
    def measurement_mode(self,mode):
        command =f":PAGE:CHAN:MODE {mode}"
        self.inst.write(command)
+        
+    #this is a method that returns data from a variable and converts them to a list of real numbers
+    def return_data(self, variable):
+        
+        #send command to instrument returns a string of comma seperated values
+        command = f":DATA? '{variable}'" 
+        data = self.inst.query(command)
+        
+        # separate the string to a list of strings
+        values = data.replace("\n",",").split(",")
+        values.pop()
+        
+        #convert the string to float numbers 
+        for i in range(len(values)):
+            values[i] = float(values[i])
+        
+        return values
\ No newline at end of file
--- a/hp4155/.ipynb_checkpoints/test-checkpoint.ipynb
+++ b/hp4155/.ipynb_checkpoints/test-checkpoint.ipynb
--- a/hp4155/.ipynb_checkpoints/hp4155a_no_class-checkpoint.ipynb
+++ b/hp4155/.ipynb_checkpoints/hp4155a_no_class-checkpoint.ipynb
--- a/hp4155/old/.ipynb_checkpoints/test-checkpoint.ipynb
+++ b/hp4155/old/.ipynb_checkpoints/test-checkpoint.ipynb
+{
+ "cells": [],
+ "metadata": {},
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
--- a/hp4155/HP4155a_class.ipynb
+++ b/hp4155/HP4155a_class.ipynb
--- a/hp4155/hp4155a_no_class.ipynb
+++ b/hp4155/hp4155a_no_class.ipynb
--- a/hp4155/test.ipynb
+++ b/hp4155/test.ipynb
--- a/hp4155/pandas.ipynb
+++ b/hp4155/pandas.ipynb
--- a/hp4155/results 2023-08-28 09:11:29.csv
+++ b/hp4155/results 2023-08-28 09:11:29.csv
+,Voltage(V),Current(A)
+0,0.0,-2.0172e-07
+1,0.05,1.7837e-05
+2,0.1,3.7577e-05
+3,0.15,6.0445e-05
+4,0.2,8.5833e-05
+5,0.25,0.000113797
+6,0.3,0.00014604
+7,0.35,0.0001823
+8,0.4,0.00022479
+9,0.45,0.00027261
+10,0.5,0.00032461
+11,0.55,0.00038161
+12,0.6,0.00044615
+13,0.65,0.00051651
+14,0.7,0.00059047
+15,0.75,0.00066731
+16,0.8,0.00075451
+17,0.85,0.0008448
+18,0.9,0.00093602
+19,0.95,0.00102376
+20,1.0,0.0011258
+21,1.05,0.0012281
+22,1.1,0.0013295
+23,1.15,0.0014353
+24,1.2,0.0015563
+25,1.25,0.0016701
+26,1.3,0.0017803
+27,1.35,0.0018951
+28,1.4,0.002029
+29,1.45,0.0021518
+30,1.5,0.0022691
+31,1.55,0.0023878
+32,1.6,0.0025273
+33,1.65,0.0026616
+34,1.7,0.0027876
+35,1.75,0.002916
+36,1.8,0.0030592
+37,1.85,0.0032063
+38,1.9,0.0033439
+39,1.95,0.003475
+40,2.0,0.0036308
+41,2.05,0.0037965
+42,2.1,0.0039297
+43,2.15,0.0040698
+44,2.2,0.0042341
+45,2.25,0.004404
+46,2.3,0.0045565
+47,2.35,0.0046994
+48,2.4,0.0048693
+49,2.45,0.0050476
+50,2.5,0.0052095
+51,2.55,0.0053543
+52,2.6,0.0055203
+53,2.65,0.0057068
+54,2.7,0.0058664
+55,2.75,0.0060137
+56,2.8,0.0061811
+57,2.85,0.0063717
+58,2.9,0.0065344
+59,2.95,0.0066796
+60,3.0,0.0068391
+61,3.05,0.0070318
+62,3.1,0.0072005
+63,3.15,0.0073433
+64,3.2,0.0074938
+65,3.25,0.0076875
+66,3.3,0.0078528
+67,3.35,0.0079939
+68,3.4,0.0081331
+69,3.45,0.008324
+70,3.5,0.0084877
+71,3.55,0.0086322
+72,3.6,0.0087642
+73,3.65,0.0089491
+74,3.7,0.0091169
+75,3.75,0.0092587
+76,3.8,0.0094001
+77,3.85,0.0095756
+78,3.9,0.0097471
+79,3.95,0.0098836
+80,4.0,0.0100007
+81,4.05,0.0101695
+82,4.1,0.0103403
+83,4.15,0.0104739
+84,4.2,0.0105835
+85,4.25,0.010747
+86,4.3,0.0109165
+87,4.35,0.0110492
+88,4.4,0.0111549
+89,4.45,0.0113035
+90,4.5,0.011437
+91,4.55,0.011582
+92,4.6,0.011752
+93,4.65,0.011885
+94,4.7,0.01199
+95,4.75,0.012118
+96,4.8,0.012294
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+98,4.9,0.012515
+99,4.95,0.012631
+100,5.0,0.012812
+101,5.05,0.012943
+102,5.1,0.013039
+103,5.15,0.013146
+104,5.2,0.013317
+105,5.25,0.01345
+106,5.3,0.013551
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+111,5.55,0.014122
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+120,6.0,0.01521
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+172,8.6,0.020026
+173,8.65,0.020103
+174,8.7,0.020242
+175,8.75,0.020314
+176,8.8,0.020345
+177,8.85,0.020408
+178,8.9,0.020549
+179,8.95,0.020624
+180,9.0,0.021077
+181,9.05,0.020751
+182,9.1,0.020862
+183,9.15,0.02093
+184,9.2,0.020973
+185,9.25,0.021014
+186,9.3,0.021131
+187,9.35,0.021219
+188,9.4,0.021269
+189,9.45,0.021204
+190,9.5,0.02139
+191,9.55,0.02151
+192,9.6,0.021572
+193,9.65,0.02159
+194,9.7,0.021701
+195,9.75,0.021798
+196,9.8,0.021869
+197,9.85,0.021896
+198,9.9,0.021991
+199,9.95,0.022039
+200,10.0,0.022167
--- a/hp4155/.ipynb_checkpoints/results-checkpoint.pdf
+++ b/hp4155/.ipynb_checkpoints/results-checkpoint.pdf
--- a/hp4155/results 2023-08-25 11:04:27.xlsx
+++ b/hp4155/results 2023-08-25 11:04:27.xlsx
--- a/hp4155/results 2023-08-25 11:31:46.xlsx
+++ b/hp4155/results 2023-08-25 11:31:46.xlsx
--- a/hp4155/results/results 2023-08-28 09:11:29.xlsx
+++ b/hp4155/results/results 2023-08-28 09:11:29.xlsx