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Anfatec USB LOCKIN 250 Manual

10 mhz to 250 khz
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USB LOCKIN 250
LOCKIN AMPLIFIER AMPLIFIER 10 mHz to 250 kHz
Anfatec Instruments AG
Melanchthonstr. 28
08606 Oelsnitz /V.
Germany
Tel.: +49 (0) 37421 24212
Tel.: +49 (0) 37421 24221
http://www.anfatec.de
email:
mailbox@anfatec.de
Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13
Page 1 (37)

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Summary of Contents for Anfatec USB LOCKIN 250

  • Page 1 LOCKIN AMPLIFIER AMPLIFIER 10 mHz to 250 kHz Anfatec Instruments AG Melanchthonstr. 28 08606 Oelsnitz /V. Germany Tel.: +49 (0) 37421 24212 Tel.: +49 (0) 37421 24221 http://www.anfatec.de email: mailbox@anfatec.de Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 1 (37)

  • Page 2: Table Of Contents

    • Parameter settings ......................17 • Time constant ...........................17 • RollOff .............................18 • Dynamic ...........................18 • Coupling ...........................18 • The Meters ..........................18 • Frequency ..........................19 • Amplitude ..........................19 • Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 2 (37)
  • Page 3 Anfatec. Other product and brand names may be trademarks or registered trademarks of their respective owners. Anfatec Instruments AG assumes no responsibility for any damage or loss resulting from use of this manual. Anfatec Instruments AG assumes no responsibility for any damage or loss resulting from use of the software.

  • Page 4: General Information

    < 7 nV < 5 nV 10 kHz 10 ms < 60 nV < 8 nV < 6 nV 1 kHz < 1 µV < 160 nV < 15 nV Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 4 (37)

  • Page 5: Reference Output

    The Source code for the remote control software and the DLL source code are provided with the General Public Licence (GPL). All examples for LabView can be freely implemented and changed by the user. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 5 (37)

  • Page 6: Installation

    Allow the setup.bat program to do changes on your PC. During installation, a command window is opened and closed when finished. For the 1 installation, this procedure might take about 20 seconds. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 6 (37)

  • Page 7: Get Started

    1 This copies the scaling data for the lockin amplifier into the registry of the PC. Afterwards, all other applications and all users can use these registry entries. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 7 (37)

  • Page 8: Driver Update

    In Windows XP and Windows 2000, start “setup.bat” in the path of the new driver ☑ In Windows 7, start “setup7.bat” in the path of the new driver ☑ Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 8 (37)

  • Page 9: Lockin Amplification Basics

    X and the imaginary part Y of the analysed signal relating to the phase position of the reference signal. Out of them the amplitude R as well as the relative phase shift φ are calculated. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 9 (37)

  • Page 10: Mathematical Description

    ) with m = 1,2,... of the input signal Y(t), which are given as  /2 ∫ −i m  t Y  m  = Y  X t e  − /2 Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 10 (37)

  • Page 11: Noise Measurements

    Butterworth filters. It is calculated by ∞ ∫ d  1 The normalized Butterworth filter noise bandwidths are: Filter order Bandwidth / τ 1.570796 1.110721 Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 11 (37)

  • Page 12: Example: Electrical Force Microscope

    The distance between tip and sample can be controlled by monitoring the oscillation amplitude of the cantilever, because Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 12 (37)
  • Page 13 Now two additional lock-in amplifiers (see Figure 6) can be used to analyse photo-detector signal frequency ω 2·ω simultaneously. The measured amplitudes of the signals are proportional to the strength of the electrical forces. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 13 (37)

  • Page 14: Hardware Description

    When the (maximum) range is 200 mV, then 200 mV signal would be shown as 10 V; and 10 mV are scaled to 500 mV, only. B) Auxiliary Outputs defined by the user to control external experiments. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 14 (37)

  • Page 15: Software Description

    70 mV low reserve. With this option can be selected whether a beep and/or a color change is shown in case of overload. ext. reference • Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 15 (37)

  • Page 16: View

    (= left number, hint: “y-scale in /div”, example: 12.90 nV/div) and the mean value. Both are calculated from all data acquired from the left oscilloscope edge till the current oscilloscope time. Therefore, these numbers are subsequently re-calculated. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 16 (37)

  • Page 17: Parameter Settings

    This option selects the used time constant for the low-pass filter. The internal LockIn functions give the lower limit of 0.2 ms (5 kHz). The possible time constants range in a logarithmic scale between 0.2 ms and 1 s. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 17 (37)

  • Page 18: Rolloff

    2 Hz and below may cause misleading results. ETERS The meters display the LockIn output channels, which are X and Y as well R and Phi, in physical units. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 18 (37)

  • Page 19: Frequency

    The upper one is a standard range, which can be changed in the “Option/acquire” part. The next three are, from the bottom to the top, the last three used frequency ranges. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 19 (37)

  • Page 20: Options For The Frequency Sweep

    The frequency values are only saved, if “Save x-Axis” is checked. All history data are saved too and also delimited the same character. Data file example: 1000,00 234,09 1200,00 237,98 ... Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 20 (37)
  • Page 21 “Standard frequency” - is the range, which appears at the topmost position, if the right mouse button is used in the data screen of the “Sweep Frequency” window. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 21 (37)
  • Page 22 Figure 15: View options for the frequency sweep. next colours from the Windows palette. If “Draw vectors” is checked, the lines are closed, otherwise data points are drawn as pixel, only. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 22 (37)

  • Page 23: Dll Description

    _declspec(dllimport) cdecl SetLockInAmpl (double Ampl); double _declspec(dllimport) cdecl SetLockInPhase (double Phase); long _declspec(dllimport) cdecl SetLockInHarm (long Harm); long _declspec(dllimport) cdecl SetLockInPllOn (long PllOn); long _declspec(dllimport) cdecl SetLockInTimeConst (long Time); Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 23 (37)

  • Page 24: Dll-Functions

    (Harmonic : integer) : integer; sets the harmonic at which the signal is analysed. The harmonic can vary between 1 and 15. It returns the harmonic value. SetLockInPllOn Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 24 (37)
  • Page 25 Returns a value in which bit 1 (corresponding to 2 ) equals 1, if the input of the USBLockIn250 is in overload state. The values of the other bits might be undefined. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 25 (37)
  • Page 26 MaxRange of Phi is always 180° while for the other channels it can be any value between -10 V and 10 V. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 26 (37)

  • Page 27: Example Programs

    12 dB Input Gain: 1 (high reserve) XAMPLE PROGRAMS Currently, there is a program examples provided in Borland Delphi 6.0 (demo.exe). It can be found in the directory %YourPath/DLL/Delphi Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 27 (37)

  • Page 28: Remote Control With Labview

    The LabView driver is based on the provided DLL file “lockin.dll”. The 'lockin.dll' is best located in the same directory as the vi-files or in any path that is known to LabView as library path. Anfatec has prepared LabView examples for LabView6.1, LabView11 and saved some special applications also for Labview9.
  • Page 29 'Start Frequency', 'Stop Frequency' and 'Number of Steps', while the results are stored and displayed in a graphical window. Figure 16: Diagram of the Frequency_Response_Lockin Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 29 (37)

  • Page 30: Description Of Example Vi Files

    USB-Lockin in LabView. The user provides the corner data for the spectra acquisition (Start Frequency, Stop Frequency, Number of Values). When the VI-file runs, one Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 30 (37)
  • Page 31 180 degrees. To get different AUX outputs here, the Phase offset in LabView- Frontpanel. Figure 20: Part of the Block Diagram of the SetAUX_Simple.vi Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 31 (37)
  • Page 32 If the chosen output channel is “Phi” the “Display Range”- Combobox is not shown because the maximum range for Phi is always 180 degrees. For the other channels the MaxRange calculated SubVI “GetUnitAndRangeFromString.vi”. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 32 (37)
  • Page 33 The VI now takes a spectrum with the selected settings and shows the resulting amplitude and phase in the diagrams. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 33 (37)
  • Page 34 LockIn amplifier. The corresponding scheme of this nose application is shown below: Output Amplitude φ Δφ * 10 F0 + kP * Δφ * 100 PhaseX Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 34 (37)

  • Page 35: Multiple Lockin Amplifiers In Labview

    Now, this “.vi” is set specifically for the chosen lockin. Repeat the above steps to create more “.dll” and “.vi” for the other USBLockIn250. (Don't forget to close the 'Lockin.exe' again for testing the '.vi'!) REVISION HISTORY REVISION HISTORY Not yet available. Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 35 (37)
  • Page 36 • Menu Line.......................15 • Meters........................18 • Multiple LockIn Amplifiers in LabView................35 • Noise Measurements....................11 • Option........................15 • Options for the frequency sweep................20 • Oscilloscope......................16 • Output........................5 • Parameter settings....................17 Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 36 (37)
  • Page 37 • RollOff........................18 • settings........................17 • Signal Input.......................4 • Software Description....................15 • Software Installation....................6 • Specification of the ....................4 • Sweep Frequency....................19f. • System requirements....................6 • Time constant......................17 • View........................16 Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13 Page 37 (37)

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