Anfatec AMU5.0-LIA, Руководство пользователя

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LABVIEW DRIVER AND SUPPORT
F
ILES AND
L
OCATIONS
The LabView driver is based on the provided DLL file “lockin.dll”.Te 'lockin.dll' has to be located
in the directory '
c:/Windows '.
Three different vi-files are provided:
Output_Lockin.vi
read the four output channels X, Y, R and Phi
Input_Lockin.vi sets the input and internal parameters of the lockin board
Frequency_Response_LockIn.vi acquires a spectrum of R and Phi
S
URFACE AND BASIC DESCRIPTION
The file Ouput_Lockin.vi reads the channels 0 to 3. Channel 0 equals X,
channel 1 equals Y. Channel 2 and 3 are R and Phi, respectively. The
numbers given here are unit-less, but meant in Volts.
The file Input_Lockin.vi allows to set the main parameters 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 of the numeric type
'Double'. They are used unit-less in this file, but their 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 frequency display shows the external frequency, onto which the system is locked. 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)
Figure 14: Frontpanel of the
Output_Lockin.vi
Figure 15: Frontpanel of the Input_Lockin.vi