Every experiment implies acquiring some measurement data, saving and analyzing it. While workinng at P.L. Kapitza Institute for Physical Problems of Russian Academy of Sciences I was asked to wrtite a software to perform afore mentioned tasks for several instruments:
- 6221 Keithley Precision DC and AC+DC Low Noise Current Source
- 2000 Keithley Precision Multimeter
- 5110 EG&G Princeton Applied Research Lock-In Amplifier
- KUSB-3116 Keithley 16-Bit USB DAQ Module
As a result I have written 9 Pre-Alpha versions, 6 Alpha versions and 3 Beta versions.
The current version is Beta Ver 1.2.vi.
Most of the instruments did not give any trouble while indtalling all the necessary libraries. Practically all of them had a support from National Instruments. However, Lock-In's libs were a little bit outdated, so I had to fix it by replacing the 'Visa open' function with the new one.
To our greatest fears the DAQ was a pain in the ass. Not only did it have faulty drivers, it also got possesed by a demon. Actually, Keithley company was purchased by Tektronix and consequently they canceled the support for this product. As a result, the libs could only be installed only on the LabVIEW 7.1. After some magic was applied I found the manufacturing company who producers the original DAQ boards for other brands and got from their official website all the needed drivers and libs.
Here I will explain the main parts in order for the users to speed up the compilation process.
This is the main VI which acquires data from our instruments writes it into the measurement file and also represents it in the real time plot figure.
This subVI creates the measurement file in this pattern: 'hh_mm_ss.dat'. It can be used in other projects.
This subVI checks if the folder has already been created or creates one in this pattern: 'prename_dd_mm_yyyy'. It can be used in other projects too.
This subVI outputs a string with initial instruments' settings that is futher written into the measurements file. As a part of the experiment the users need to know how the instruments were preconfigured.
This subVI gets Lock-In's sensitivity.
This subVI gets Lock-In's Time Constant.
If by any chance you know Russian, you can read a very detailed explanation of the project in this report: Report
Here is a demonstration of the working software without preamplifiers.
Here is a demonstration of the working software with preamplifiers.
# 1kOhm 08/12/2017 PREAMPS EXPERIMENT
# Lock-In: 5110 Sensitivity: 100mV Time Constant: MIN | | Keithley: 6221 Start current: 1.00E-6 A Stop current: 2.00E-6 A
# t, ms 6221, A 2000, V 5110_X, V 5110_Y, V DAQ A0, V DAQ A1, V DAQ A2, V DAQ A3, V DAQ A4, V
00000648 1.00E-6 0.998236 3.35000E-3 9.1000E-4 -9.0332E-1 -3.0518E-4 0.0000E+0 -3.0518E-4 -0.000610
00001857 1.02E-6 1.016245 3.24000E-3 1.8300E-3 -9.6069E-1 6.1035E-4 0.0000E+0 -3.0518E-4 0.000000
00002216 1.04E-6 1.037809 3.95000E-3 2.6800E-3 -9.9365E-1 -3.0518E-4 0.0000E+0 -3.0518E-4 0.000000
00003000 1.06E-6 1.048590 3.28000E-3 2.1600E-3 -1.0294E+0 -6.1035E-4 -3.0518E-4 -3.0518E-4 0.000000
00004000 1.08E-6 1.076034 3.24000E-3 2.1800E-3 -1.0544E+0 -3.0518E-4 -3.0518E-4 0.0000E+0 -0.000305
00005000 1.10E-6 1.095850 3.21000E-3 1.6600E-3 -1.0739E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 -0.000305
00006000 1.12E-6 1.115176 3.19000E-3 2.0600E-3 -1.0947E+0 0.0000E+0 -3.0518E-4 0.0000E+0 -0.000305
00007000 1.14E-6 1.136197 3.42000E-3 2.1100E-3 -1.1148E+0 0.0000E+0 -3.0518E-4 3.0518E-4 0.000000
00008000 1.16E-6 1.155186 3.49000E-3 2.2300E-3 -1.1346E+0 0.0000E+0 0.0000E+0 -3.0518E-4 0.000000
00009000 1.18E-6 1.175308 3.57000E-3 2.6300E-3 -1.1545E+0 -6.1035E-4 0.0000E+0 0.0000E+0 0.000000
00010000 1.20E-6 1.196291 4.00000E-3 6.7000E-4 -1.1749E+0 0.0000E+0 -6.1035E-4 0.0000E+0 -0.000305
00011000 1.22E-6 1.197205 3.77000E-3 4.2000E-4 -1.1942E+0 0.0000E+0 -3.0518E-4 0.0000E+0 0.000000
00012000 1.24E-6 1.236288 3.62000E-3 8.4000E-4 -1.2149E+0 -3.0518E-4 -6.1035E-4 0.0000E+0 0.000000
00013000 1.26E-6 1.243644 3.56000E-3 6.8000E-4 -1.2344E+0 0.0000E+0 -6.1035E-4 -3.0518E-4 -0.000305
00014000 1.28E-6 1.275445 3.46000E-3 4.7000E-4 -1.2537E+0 -6.1035E-4 3.0518E-4 0.0000E+0 0.000000
00015000 1.30E-6 1.295473 3.34000E-3 8.1000E-4 -1.2747E+0 0.0000E+0 0.0000E+0 -6.1035E-4 -0.000610
00016000 1.32E-6 1.316456 3.27000E-3 1.0800E-3 -1.2946E+0 3.0518E-4 0.0000E+0 -3.0518E-4 -0.000305
00017000 1.34E-6 1.335293 3.28000E-3 1.1600E-3 -1.3147E+0 0.0000E+0 -6.1035E-4 0.0000E+0 -0.000305
00018000 1.36E-6 1.356196 3.17000E-3 1.3600E-3 -1.3339E+0 0.0000E+0 -3.0518E-4 3.0518E-4 -0.000305
00019000 1.38E-6 1.375481 3.19000E-3 2.0100E-3 -1.3538E+0 0.0000E+0 3.0518E-4 -3.0518E-4 -0.000305
00020000 1.40E-6 1.395838 4.01000E-3 2.1300E-3 -1.3727E+0 -6.1035E-4 -3.0518E-4 -3.0518E-4 -0.000610
00021000 1.42E-6 1.414718 3.98000E-3 2.4900E-3 -1.3943E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 -0.000305
00022000 1.44E-6 1.435626 3.75000E-3 2.7700E-3 -1.4139E+0 0.0000E+0 0.0000E+0 -3.0518E-4 0.000000
00023000 1.46E-6 1.454992 3.62000E-3 2.4700E-3 -1.4349E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 0.000305
00024000 1.48E-6 1.475668 3.55000E-3 2.5500E-3 -1.4542E+0 0.0000E+0 -6.1035E-4 0.0000E+0 -0.000305
00025000 1.50E-6 1.495000 3.52000E-3 2.7600E-3 -1.4743E+0 0.0000E+0 -3.0518E-4 -3.0518E-4 -0.000305
00026000 1.52E-6 1.515557 3.32000E-3 2.5200E-3 -1.4941E+0 -3.0518E-4 0.0000E+0 0.0000E+0 0.000000
00027000 1.54E-6 1.534987 4.25000E-3 2.2000E-3 -1.5137E+0 -3.0518E-4 -3.0518E-4 -6.1035E-4 -0.000305
00028000 1.56E-6 1.555247 4.23000E-3 2.1800E-3 -1.5338E+0 -3.0518E-4 0.0000E+0 0.0000E+0 0.000000
00029000 1.58E-6 1.574216 4.28000E-3 1.8600E-3 -1.5533E+0 -3.0518E-4 0.0000E+0 -3.0518E-4 0.000000
00030000 1.60E-6 1.582733 4.30000E-3 1.2500E-3 -1.5738E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 -0.000305
00031000 1.62E-6 1.613834 4.12000E-3 1.1600E-3 -1.5933E+0 0.0000E+0 -3.0518E-4 -3.0518E-4 -0.000305
00032000 1.64E-6 1.621248 4.03000E-3 9.6000E-4 -1.6135E+0 -3.0518E-4 0.0000E+0 -6.1035E-4 0.000000
00033000 1.66E-6 1.654703 3.88000E-3 5.5000E-4 -1.6336E+0 -3.0518E-4 0.0000E+0 -3.0518E-4 -0.000305
00034000 1.68E-6 1.668042 3.68000E-3 6.2000E-4 -1.6531E+0 -3.0518E-4 -6.1035E-4 0.0000E+0 -0.000305
00035000 1.70E-6 1.694603 3.58000E-3 7.9000E-4 -1.6733E+0 0.0000E+0 -3.0518E-4 -3.0518E-4 -0.000305
00036000 1.72E-6 1.702710 3.54000E-3 4.8000E-4 -1.6934E+0 0.0000E+0 -9.1553E-4 -3.0518E-4 0.000000
00037000 1.74E-6 1.734313 3.38000E-3 2.7100E-3 -1.7136E+0 0.0000E+0 0.0000E+0 -3.0518E-4 -0.000610
00038000 1.76E-6 1.744599 3.27000E-3 1.0700E-3 -1.7325E+0 -3.0518E-4 -3.0518E-4 0.0000E+0 -0.000305
00039000 1.78E-6 1.773869 3.33000E-3 2.1700E-3 -1.7529E+0 -3.0518E-4 0.0000E+0 -3.0518E-4 -0.000305
00040000 1.80E-6 1.779540 3.21000E-3 2.0300E-3 -1.7722E+0 0.0000E+0 0.0000E+0 -3.0518E-4 -0.000305
00041000 1.82E-6 1.812543 3.21000E-3 1.3200E-3 -1.7935E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 0.000000
00042000 1.84E-6 1.829009 3.33000E-3 1.2000E-3 -1.8130E+0 0.0000E+0 0.0000E+0 0.0000E+0 0.000000
00043000 1.86E-6 1.852889 3.48000E-3 1.1600E-3 -1.8329E+0 -3.0518E-4 0.0000E+0 0.0000E+0 -0.000305
00044000 1.88E-6 1.872276 3.54000E-3 8.1000E-4 -1.8527E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 0.000000
00045000 1.90E-6 1.893485 3.71000E-3 5.6000E-4 -1.8732E+0 0.0000E+0 3.0518E-4 0.0000E+0 0.000000
00046000 1.92E-6 1.911982 3.89000E-3 6.4000E-4 -1.8927E+0 -3.0518E-4 3.0518E-4 -3.0518E-4 -0.000610
00047000 1.94E-6 1.931789 3.98000E-3 8.3000E-4 -1.9128E+0 3.0518E-4 -3.0518E-4 3.0518E-4 -0.000610
00048000 1.96E-6 1.953195 3.98000E-3 5.5000E-4 -1.9327E+0 -3.0518E-4 0.0000E+0 -3.0518E-4 -0.000610
00049000 1.98E-6 1.972151 4.15000E-3 4.9000E-4 -1.9528E+0 -3.0518E-4 0.0000E+0 -3.0518E-4 0.000000
00050000 2.00E-6 1.993207 4.28000E-3 1.0700E-3 -1.9730E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 0.000000
# 16/11/17
# Lock-In: 5110 Sensitivity: 500mV Time Constant: MIN | | Keithley: 6221 Start current: 1.00E-3 A Stop current: 1.20E-3 A
# t, ms 6221, A 2000, V 5110_X, V 5110_Y, V DAQ A0, V DAQ A1, V DAQ A2, V DAQ A3, V DAQ A4, V
00000664 1.00E-3 0.999635 2.30000E-2 3.0000E-4 9.9945E-1 0.0000E+0 -6.1035E-4 0.0000E+0 -0.000305
00001862 1.00E-3 1.003631 1.88500E-2 9.6000E-3 1.0037E+0 0.0000E+0 0.0000E+0 -3.0518E-4 0.000000
00002267 1.01E-3 1.007625 2.01500E-2 3.6000E-3 1.0083E+0 -6.1035E-4 0.0000E+0 -3.0518E-4 0.000000
00002995 1.01E-3 1.011620 1.56000E-2 1.3900E-2 1.0110E+0 -3.0518E-4 0.0000E+0 0.0000E+0 0.000000
00003995 1.02E-3 1.015577 2.14500E-2 7.9500E-3 1.0165E+0 -3.0518E-4 -3.0518E-4 0.0000E+0 -0.000610
00004995 1.02E-3 1.019607 1.87500E-2 8.4000E-3 1.0196E+0 -3.0518E-4 -3.0518E-4 0.0000E+0 0.000000
00005995 1.02E-3 1.023602 1.88500E-2 6.8000E-3 1.0242E+0 -3.0518E-4 0.0000E+0 0.0000E+0 0.000000
00006995 1.03E-3 1.027670 1.87500E-2 8.6000E-3 1.0269E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 -0.000305
00007995 1.03E-3 1.031628 1.84000E-2 8.8000E-3 1.0278E+0 0.0000E+0 -3.0518E-4 -3.0518E-4 -0.000305
00008995 1.04E-3 1.035662 1.89000E-2 8.6000E-3 1.0355E+0 0.0000E+0 0.0000E+0 3.0518E-4 0.000000
# Sensitivity: 100mV
00009995 1.04E-3 1.039618 -6.20000E-4 -2.3400E-3 1.0394E+0 -6.1035E-4 -3.0518E-4 0.0000E+0 0.000000
00010995 1.04E-3 1.043662 2.68000E-3 2.1200E-3 1.0437E+0 -3.0518E-4 -3.0518E-4 -6.1035E-4 0.000000
00011995 1.05E-3 1.047620 1.51000E-3 -1.3900E-3 1.0464E+0 -3.0518E-4 -3.0518E-4 -3.0518E-4 -0.000305
00012995 1.05E-3 1.051651 3.72000E-3 1.7600E-3 1.0519E+0 -3.0518E-4 3.0518E-4 0.0000E+0 0.000000
00013995 1.06E-3 1.055608 3.79000E-3 1.7100E-3 1.0550E+0 -6.1035E-4 0.0000E+0 -3.0518E-4 0.000000
00014995 1.06E-3 1.059641 2.89000E-3 -2.0000E-5 1.0587E+0 0.0000E+0 -3.0518E-4 -3.0518E-4 -0.000610
00015995 1.06E-3 1.063635 4.79000E-3 3.3600E-3 1.0635E+0 -3.0518E-4 0.0000E+0 -6.1035E-4 0.000000
00016995 1.07E-3 1.067631 3.75000E-3 1.7300E-3 1.0675E+0 -3.0518E-4 -9.1553E-4 -3.0518E-4 -0.000305
00017995 1.07E-3 1.071624 3.79000E-3 1.9200E-3 1.0712E+0 -3.0518E-4 -6.1035E-4 0.0000E+0 0.000305
- Sergey Chernayev - Initial work - lordonium
All other known bugs and fixes can be sent to chernayev.sergey.work@gmail.com
Reported bugs/fixes will be submitted to correction
This project is licensed under the MIT License - see the LICENSE.md file for details
- Arutyunov Konstantin Yurievich (for an exciting opportunity to work on this amazing project)
- Zavyalov Vitaly Vadimovich (inspiring ideas about DAQ and software in general)
- Khaldeev Stanislav Igorevich (amazing tips about the code)