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Anfatec AMU5.0-LIA Manual

Pci-bus lockin amplifier 1 hz to 2 mhz
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PCI-BUS LOCKIN AMPLIFIER 1 HZ TO 2 MHZ
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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01
Page 1 (34)

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Summary of Contents for Anfatec AMU5.0-LIA

  • Page 1 PCI-BUS LOCKIN AMPLIFIER 1 HZ TO 2 MHZ 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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 1 (34)

  • Page 2: Table Of Contents

    • Sweep frequency..........................15 • Sweep bias............................15 • • Oscilloscope..........................15 Parameter settings........................16 • Time constant...........................16 • • RollOff.............................17 • Dynamic............................17 • Coupling............................17 Meters............................17 • • Frequency............................18 • Amplitude............................18 • Phase..............................18 Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 2 (34)
  • 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

    Frequency range 1 Hz .. 2 MHz Locking time < (100 ms + 10 Cycle) Phase error < 4 deg @ f = 1 kHz Input amplitude TTL, sine wave Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 4 (34)

  • Page 5: General

    Therefore, GPL protects the software so, that all programs which are based on a GPL protected source code has to provided with the same GPL again. The licence also hinders software patenting. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 5 (34)

  • Page 6: Get Started

    PC” is found there, even the changes of the BIOS will not help, to make Windows use the APIC. If you find the entry “Standard PC”, you can follow the instructions in the APIC configuration. NSTALLATION Switch off the PC. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 6 (34)

  • Page 7: Driver Installation

    “other sources”. It is the path, where the new *.inf file is located. Eventually, you have to select again the right device from a list of possible devices. Check the Anfatec Measurement Unit again and say “OK” and “Finish”. The PC has to be rebooted in order to activate the new driver.
  • Page 8 Click on Start • Enter “devmgmt.msc” in the Search Line to open the Device Manager • Select the “Anfatec Lockin Interface” and right-click to “Update Driver Software” • “Browse for driver software on your computer” • provide the path “%YourPath/Driver/version/..”...

  • Page 9: Connections To The Card

    Remark: Wrong BIOS settings can cause, that Windows refuses to repair the system from CD. It will stop with “could not find ntkrnlmp.exe – error code 7” for instance. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 9 (34)

  • Page 10: Lockin Basics

    X and the imaginary part Y of the analyzed 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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 10 (34)

  • Page 11: 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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 11 (34)

  • Page 12: Noise Measurements

    Butterworth filter. It is calculated by ∞ ∫ d  . 1 The normalized Butterworth filter noise bandwidths are: Bandwidth / τ Filter order 1,570796 1,110721 1,026172 Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 12 (34)

  • Page 13: Example: Electrical Force Microscope

    Waals forces. Therefore a reflected laser beam and a position-sensitive photo-detector are used. A lock-in amplifier analyzes the detector signal at the cantilever resonance frequency ω and passes the determined amplitude value to a feedback control Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 13 (34)
  • Page 14 Now two additional lock-in amplifiers (see Figure 6) can be used to analyze the photo-detector signal at the frequency ω and 2·ω simultaneously. The measured amplitudes of the signals are proportional to the strength of the electrical forces. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 14 (34)

  • Page 15: Software Description

    With this option can be selected whether a beep and/or a color change is shown in case of overload. ext. reference • For LockIn-amplifier versions with PLL (Phase locked loop), the reference frequency can be either Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 15 (34)

  • Page 16: View

    Help as PDF – calls the current manual (AMU24_Manual.pdf) and opens it in the Microsoft Internet Explorer. UNCTIONS IN THE FUNCTION LINE WEEP FREQUENCY Opens the "frequency sweep" window WEEP BIAS Opens the "bias sweep" window Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 16 (34)

  • Page 17: Oscilloscope

    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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 17 (34)

  • 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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 18 (34)

  • 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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 19 (34)

  • 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 Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 20 (34)
  • Page 21 The last is red, and the last but one is green. More curves get the usual next colours from the Windows palette. It can be chosen between pixel and vector drawing of data. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 21 (34)
  • Page 22 Figure 13: View options for the frequency sweep. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 22 (34)

  • Page 23: How To Use Two Lockin Cards In One Pc

    Behind the entry „Target“, add the name of an independent user.ini file: In the folder, in which the executable is located, two independent ini- files will be created: Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 23 (34)

  • Page 24: Simultaneous Usage Of Two Cards

    Open both Desktop links. If not already correctly selected, choose View --> Devices: Then, a list of availabe „Anfatec LockIn Devices“ is shown at the bottom of the user interface: Select the device, you like to address with this link.

  • Page 25: Dll Support

    To call functions residing in the DLL, headers are necessary, so add 'import.cpp' also to the project, which contains: extern "C"{ double _declspec(dllimport) cdecl SetLockInFreq (double freq): double; void _declspec(dllimport) cdecl SetLockInAmpl (double Ampl); Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 25 (34)

  • Page 26: Dll-Functions

    0.25 ms 0.5 ms 1 ms 2 ms 5 ms ..SetLockInRollOff sets the RollOff for the low pass filter: Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 26 (34)

  • Page 27: Example Programs

    Windows Registry. Later, the DLL just uses the entries in the Registry. If the lockin.ini is not available in this directory, an error message appears when the program starts: Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 27 (34)

  • Page 28: Labview Driver And Support

    If the PLL is OFF, it shows the same frequency that the user has set in the frequency input. The Frequency_Response_LockIn.vi is one possible example which shows how spectra might be Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 28 (34)

  • Page 29: Programming Directions In Labview

    DLL-function and its exchange value: The used library is the 'lockin.-dll'. The example sets the frequency with the function 'SetLockInFreq'. The value is of numerical type and 8-Byte Double long. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 29 (34)
  • Page 30 'Start Frequency', 'Stop Frequency' and 'Number of Steps', while the results are stored and displayed in a graphical window. Figure 17: Diagram of the Frequency_Response_Lockin Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 30 (34)
  • Page 31 Figure 18: Diagram of the Input_Lockin Both sub-vi's 'Input_Lockin' and 'Output_LockIn' are used in the frequency sweep. They only connect the numerical data and DLL function. Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 31 (34)

  • Page 32: Revision History

    • Example programs..........................24 • Example: Electrical Force Microscope...................12 • File..............................14 • Files and Locations.........................25 • Frequency............................18 • frequency sweep..........................19 • Frequency Sweep..........................18 • function line............................15 • Functions in the function line......................15 Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 32 (34)
  • Page 33 • Software description........................14 • Software installation.........................6 • Specification of the AMU2.4-LIA....................4 • start..............................6 • Surface and basic description......................25 • sweep frequency..........................19 • Sweep Frequency..........................18 • System requirements.........................6 • Time constant..........................16 Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 33 (34)
  • Page 34 • View..............................15 • ..............................8, 21, 28 Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01 Page 34 (34)

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