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The frequency sweep example consists of a loop, in which each single frequency value in the
spectrum is calculated based on the input parameters 'Start Frequency', 'Stop Frequency' and
'Number of Steps', while the results are stored and displayed in a graphical window.

Manual Anfatec PCI-Lockin Amplifier AMU5.0 – Rev. 1.01

Page 30 (34)

Figure 17: Diagram of the Frequency_Response_Lockin

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Summary of Contents for AMU5.0-LIA

Page 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...

Page 2: ...the card 8 APIC configuration 8 LockIn Basics 9 The general idea of LockIn 9 Mathematical description 10 Noise Measurements 11 Example Electrical Force Microscope 12 Software description 14 Overview 1...

Page 3: ...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...

Page 4: ...t Uac 0 V 50 1 kHz 1 MHz 100 kHz high dynamic reserve 100 nVrms Hz0 5 typ 35 nV Hz0 5 100 kHz normal dynamic reserve 5 nVrms Hz0 5 typ 3 6 nV Hz0 5 100 kHz low noise 4 nVrms Hz0 5 typ 2 5 nV Hz0 5 Rol...

Page 5: ...o get in trouble due to the users changes Most commercial software packages don t use this licence because they want to keep the right to sell the newer version later as update An open software can be...

Page 6: ...R APIC CONFIGURATION The APIC improves the interrupt control in your system The APIC will dramatically increase the performance of the PC It is installed together with the Power Manager while Windows...

Page 7: ...tor and call in the System control the topic system Chose the card hardware and open the device manager It shows all hardware components installed on your PC With a double click on the Anfatec Measure...

Page 8: ...ource Code of the DLL in DLL DLLSourceXE7 Driver Installation Connect the USB lockin first If the system asks for a driver browse on the USB Stick for Driver version x86 for 32 bit or Driver version x...

Page 9: ...shown Alle Hardwarekomponenten dieser Ger teklasse anzeigen It appears a list on the right sight which shows standard PC ACPI Uniprocessor PC and others Select now the ACPI Uniprocessor PC and say OK...

Page 10: ...igure 9 shows that the amplitude at the input frequency is always measured with the same value For other frequencies the measured amplitude is dependent on the distance between the actual centre frequ...

Page 11: ...can be developed into a Taylor Series Equ 1 For the value of Y at the time t all measurement values Y t detected in the period are used This period t should be a whole numbered multiple of 2pwref Due...

Page 12: ...7 64 15 128 NOISE MEASUREMENTS Lock in amplifiers are capable to measure noise They detect a signal at a certain center frequency ref with an equivalent noise bandwidth For a Gaussian noise the equiv...

Page 13: ...example about the local distribution of surface potentials on electronic devices or different dopant concentrations in semiconducting materials The fundamental experimental setup shown in Figure 6 is...

Page 14: ...eparating the impact of these electrical forces from other forces e g van der Waals forces U has to be modulated at the frequency ref As a result of this the measurable photo detector signal is modula...

Page 15: ...rs The menu line allows typical Windows functions while the button in the function line open new windows with specific functions FUNCTIONS IN THE MENU LINE FILE Exit Exit the program OPTION overload O...

Page 16: ...ed PLL the frequency given in the frequency window is written in black VIEW It can be selected which of the meters is shown HELP About shows the current program version LockIn help calls the table of...

Page 17: ...al scaling types 0 max the scaling is set to maximum value of the channel 0 fixed the maximum value can be changed by a slider appearing on the right sight of the scaling type selection 0 auto the pro...

Page 18: ...maximum signal amplitude is then 10 V The normal input amplification is 10 which equals maximum signal amplitudes of 1 V When the low dynamic is chosen the resolution of the LockIn is highest but the...

Page 19: ...saving and copying the acquired data can be changed in the option window WINDOW DESCRIPTION Delay is the time delay between each acquired data point During spectrum acquisition the frequency is set to...

Page 20: ...a copied to the clipboard have an ASCII structure The data are written in lines each frequency value one line and delimited by the given delimiter TAB in the example are saved The frequency values are...

Page 21: ...the right mouse button is used in the data screen of the Sweep Frequency window In the data screen several data curves can be displayed simultaneously Therein the History depth is the number of old cu...

Page 22: ...Manual Anfatec PCI Lockin Amplifier AMU5 0 Rev 1 01 Page 22 34 Figure 13 View options for the frequency sweep...

Page 23: ...ager there is no difference between PCI and PCIe card visible Use the driver version 8 0 0 2 dated 25th July 2018 Generate an icon link for each deveice on the desktop Right click on each icon to chan...

Page 24: ...ew 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 If the Desktop link is started next time the...

Page 25: ...ated in C Windows WORKING WITH THE DLL IN C PROJECTS Add the lib file genarated from the DLL to the project in Borland C Builder 5 0 by opening Project Add to Project see figure Chose the lockin lib a...

Page 26: ...is OFF the return value equals the sent value If the PLL is ON this function can be used to read the external frequency value SetLockInAmpl sets the output amplitude of the reference output in V and g...

Page 27: ...1 PLL off Time constant 1 ms RollOff 12 dB Input Gain 1 high reserve EXAMPLE PROGRAMS There are two program examples provided one in Borland Delphi 6 0 demo exe and one in Borland C Builder 5 0 They...

Page 28: ...of the lockin Input Gain Time Constant and Roll Off are given as integers The relation between the value and the integer is described together with the DLL Frequency Harmonic Amplitude and Phase are o...

Page 29: ...requency is monitored PROGRAMMING DIRECTIONS IN LABVIEW Switch into the diagram view of the vi files The parameters are set and read with the DLL functions or double click into these functions to open...

Page 30: ...the spectrum is calculated based on the input parameters Start Frequency Stop Frequency and Number of Steps while the results are stored and displayed in a graphical window Manual Anfatec PCI Lockin A...

Page 31: ...put_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 Figure 18 Diagram of t...

Page 32: ...rd Installation 6 configuration 6 8 Connections to the card 8 Coupling 17 description 10 14 directions 26 DLL in C projects 22 DLL support 22 DLL Functions 23 Driver Installation 7 Dynamic 17 Example...

Page 33: ...ements 11 Option 14 Options for the frequency sweep 19 Oscilloscope 15 Output 4 Parameter settings 16 Phase 18 PLL 4 Reference Output 4 requirements 6 Revision History 29 Revisions 29ff RollOff 17 set...

Page 34: ...View 15 8 21 28 Manual Anfatec PCI Lockin Amplifier AMU5 0 Rev 1 01 Page 34 34...

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