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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:

[email protected]

Manual USB Lockin 250 – Rev. 1.03 dated 07/11/13

Page 1 (37)

Summary of Contents for USB LOCKIN 250

Page 1: ...PLIFIER 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...

Page 2: ...Driver Update 8 LockIn Amplification Basics 9 The general idea of Lockin Amplification LockIn 9 Mathematical description 10 Noise Measurements 11 Example Electrical Force Microscope 12 Hardware Descr...

Page 3: ...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...

Page 4: ...te 20 MHz Bandwidth dc to 250 kHz f 3dB 250 kHz Input Ranges 3 5 Vrms 350 mVrms 35 mVrms Input Sensitivity 10 nV to 10 V Typical Input Noise Uac 0 V 50 input see table RollOff 6 dB oct 12 dB oct 24 dB...

Page 5: ...Sampling rate 1 MHz 1 s group delay Output Voltage 10 V 10 V Output Noise 300 nV sqrt Hz Accuracy 2 GENERAL Interface Plug Play USB 2 0 interface Drivers Windows NT 2000 Windows XP Win7 32 bit Power...

Page 6: ...ws right click on the top most folder and select properties select the tab Security select Users and click on Edit allow Full control and use Apply and OK to verify DRIVER INSTALLATION Connect the USB...

Page 7: ...the software selected scaling Phi Y is the analogue output connected to Panel meter 2 or the Auxiliary Output 1 if these outputs are used as customer specific outputs It provides an analogue signal o...

Page 8: ...ur computer provide the path YourPath Driver select the driver USB Lockin Say OK when Windows recommends not to install from an unknown driver vendor B install with setup program in C Users USBLockin...

Page 9: ...f around the input frequency fin Figure 11 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 dist...

Page 10: ...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 11: ...3 32 7 64 15 128 NOISE MEASUREMENTS Lock in amplifiers are capable to measure noise They detect a signal at a certain centre frequency ref with an equivalent noise bandwidth For Gaussian noise the equ...

Page 12: ...to detect electrical forces to learn something about the electrical properties of a surface for example about the local distribution of surface potentials on electronic devices or different dopant con...

Page 13: ...m the physical point of view potential differences caused by different electronic work functions and charges For separating the impact of these electrical forces from other forces e g van der Waals fo...

Page 14: ...t scaling automatically is set to 180 10 V and 180 10 V For X Y and R one can set a range between 10 nV 1E 8 and 10 V The lockin amplifier scales the data to 10 V 10 V so that range equals 10 V Exampl...

Page 15: ...tected external frequency from the reference input grey numbers The menu line allows typical Windows functions while the button in the function line open new windows with specific functions FUNCTIONS...

Page 16: ...iew HELP About shows the current program version and the version of the used hardware driver LockIn help calls the table of contents of the HTML help file supplied with the program Help as PDF calls t...

Page 17: ...caled Time scaling is done with the edit window right sight in seconds Save Pic saves the oscilloscope screen in a bitmap file Draw mode selects whether the data are drawn as dots or lines PARAMETER S...

Page 18: ...e 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 th...

Page 19: ...he 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...

Page 20: ...the data 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 val...

Page 21: ...en the neighboured values while the data are taken This makes sure that even small peaks can be found in an overview spectrum with only some 100 data points Standard frequency is the range which appea...

Page 22: ...and the last but one curves are displayed The actual curve is always of black colour The last is red and the last but one is green More curves get the usual next colours from the WindowsTM palette If...

Page 23: ...project in Borland C Builder 5 0 by opening Project Add to Project see figure Chose the lockin lib as the file to be added If the lockin lib does not exist it can be created from the command line open...

Page 24: ...rnal frequency when then PLL is ON SetLockInTimeBase gives back the IdleCount which is calculated from the given TimeBase and PointsPerDivision If the setting of the current device succeeded is given...

Page 25: ...integer sets the time constant for the low pass filter TimeConst 0 10 s 1 20 s 2 50 s 3 0 1 ms 4 0 2 ms 17 5 s SetLockInRollOff function SetLockInRollOff RollOff integer integer sets the RollOff for t...

Page 26: ...filled SetLockInTimeBase function SetLockInTimeBase timeBase Double Double timeBase is the time between two data points The function returns the calculated idle count IsUSBLockin function IsLockInUSB...

Page 27: ...be addressed independently see also page 35 GetVersion function GetVersion PChar Returns the hardware serial number e g 280007 the version number of the driver e g 0 07 0 3 and the version of the dll...

Page 28: ...d_Input_Lockin vi sets the input and internal parameters of the lockin specified by a device string only useful if more than one USB LockIn250 is used at the same time Frequency_Response_LockIn vi acq...

Page 29: ...array type 8 Byte Double 1 dimension array pointer longbool numerical type signed 32 Bit Integer PChar string type pointer to C String The frequency sweep example for instance consists of a loop in wh...

Page 30: ...units are meant in Hz Volts and Degree respectively Beside the frequency input the current frequency is displayed Also an additional switch allows to enable the PLL function When the PLL is ON this fr...

Page 31: ...GetUnitAndRangeFromString vi to get MaxRange in Volts from the string provided by the Display Range Combobox e g 0 01 from 10 mV With an Output Amplitude of 10 mV the AUX0 output at a display range of...

Page 32: ...iew is the VI SetAUX_Lockin vi It has nearly the same functionality as the lockin exe It sets the TimeConst Combobox with different arrays if the device is an USB LockIn250 or a PCI LockIn If the chos...

Page 33: ...d in the second part of the VI It depends on the Range of the supplied String The VI Nase_LockIn vi in LabView9 folder only consists of two part First comes an initialization Start the VI after you co...

Page 34: ...point will also be set as the reference phase These two values will be shown as f0 and PhaseX accordingly Now the two diagrams become invisible and a new graph appears The new diagram shows the new ph...

Page 35: ...ram Lockin exe enable View Devices if not already shown right click on the device string that corresponds to the chosen USBLockIn250 and copy it paste the copied string into the input of the function...

Page 36: ...9f Functions in the Function Line 16 Functions in the Menu Line 15 General Information 4 Hardware 14 Harmonic 19 Help 16 Input 4 Installation 6 LabView 28 Licence for the software 5 Locations 28 LockI...

Page 37: ...28 Revision History 35 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...

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