Quadera Pfeiffer программа управления (1248465), страница 15
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Create a new calibration project: In the "Templates" list, double-click e.g.Background Determination.qmt. This way you create a new calibrationproject based on the selected template. You can modify it according to yourneeds.5. The new measurement project window appears. The working area displays thecalibration project.• Edit the recipe according to your needs (if necessary): Click thecorresponding tab in the working area selection.The measurement tasks must not contain mass numbers where peaks ofthe zero gas appear.• Display the measuring data: Click the corresponding tab in the workingarea selection.NOTE:You can start the measurement regardless whether the recipe editor or theworking area has been selected.6.
Start the measurement: In the device status view, click on the "Start" icon.The connection to the device is automatically established. The device nowreceives the parameters for the current measurement task. The measurementis running automatically.7. Check the measured values, e.g. display the measuring data in a table.8. Click Apply to Background Library to forward the background measurementto the Background Library. Note:• New background measurements (mass numbers) are added to theBackground Library,• Current measuring values replace existing data sets in the BackgroundLibrary.128QUADERA9.
Close and save the measurement project. In the File menu, click Close. Youare requested if you want to save the measurement project. QUADERA®suggests an automatically generated file name that is based on date/time ofthe measurement and the used template.• Yes: the "Save As" window used for saving measuring data opensup.
Select a suitable name and path and then click Save. Themeasurement project will be saved and closed.Please note: The file extension for measurement projects is *.qmp• No (recommended option): the measurement project will be closedwithout saving the data.• Cancel: the action is cancelled. You will return to the measurementproject without saving the data.NOTE:The data sets in the Background Library will be subtracted in MID and MCDmeasurements. If you wish to skip this subtraction then reset the data setsin the Background Library ("Delete Background Library" button).129QUADERA HTML HelpBackground LibraryThe Background Library in the section of the calibration project displays theparameters required to determine the background.
Changed parameters take effect inthe next measurement task.The Background Library contains the corresponding background data for all measuredmass numbers in tabular form. You can use various zero gases and performconsecutive background determinations. The results can be combined in theBackground Library (function "Apply to Background Library"). Note that an individualBackground Library is created for each installed detector.Image of background library (example)ParameterRangeDescription•Dropdown listThe Background Library is displayedfor the selected detector type:Detector•Faraday: the table for theFaraday detector is displayed.•SEM: the table for the SEMdetector is displayed.•IonCounter (only QMG700): thetable for the ion counter isdisplayed.•MassMass number(not editable)Mass number for which thebackground has been determined:applied from the related MID recipe("Mass" parameter).•IntensityMeasured valueBackground intensity at the relatedmass number:corresponds to the currentlymeasured value for this massnumber.•Apply toBackgroundLibraryButtonApply the result of the currentbackground determination to theBackground Library for the detectorthat is selected in the recipe.NOTE:130•New backgroundmeasurements are addedto the Background Library,•Current measuring valuesreplace existing data setsin the Background Library.QUADERAParameterRangeDescription•ButtonDelete all data sets of the BackgroundLibrary, for all detectors.DeleteBackgroundLibraryNOTE:"Delete Background Library"deletes the data sets of theBackground Library irretrievably.In this case, a new backgrounddetermination is required for newdata sets.131QUADERA HTML HelpGas Specific CalibrationGas Specific CalibrationNOTE:Perform the following preparatory measurements before the gas specificcalibration:• Calibrate the mass scale,• Determine the offset,• Determine the background.BasicsAn MCD measurement project uses a matrix of calibration factors (analysis matrix) toconvert ion currents into gas concentrations.
The calibration factors are notuniversally valid. They have to be quantified by a separate calibration measurementusing known gases (calibration gases). Calibration gases are selected according to thecomponents in the measurement project whose concentrations are to be measured.NOTE:Gas mixtures that contain components with overlapping masses are notsuited for use as calibration gas. The same mass number must not beassigned to several components.ProcedureOne MID measurement project is created per calibration gas. The recipe parametersinclude the mass numbers of the calibration gas components and can be modified inthe recipe editor.
The "GSC Matrix" editor specifies the concentration of eachcalibration gas component and its contribution on the related mass number. The gasspecific calibration factors are required for the actual MCD measurement project.They are determined in the calibration project (GSC Result View) and saved in theMCD Calibration Factor Library.132QUADERADetermining the GSC FactorsNOTE:Before starting the measurement, check the correct calibration of the massspectrometer components. If calibration is necessary, perform the followingpreparatory measurements:• Calibrate the mass scale,• Determine the offset.• Determine the background.NOTE:Gas mixtures that contain components with overlapping masses are notsuited for use as calibration gas.
The same mass number must not beassigned to several components.1. Feed a suitable calibration gas into the vacuum chamber.2. Open the start page: In the View menu, click Show Start Page.3. Click on the icon for the required device.4. Create a new calibration project: In the "Templates" list, double-click e.g. GasSpecific Calibration.qmt. This way you create a new calibration projectbased on the selected template.
You can modify it according to your needs.5. The new measurement project window appears. The working area displays thecalibration project.• Edit the recipe according to your needs (if necessary): Click thecorresponding tab in the working area selection.• Display the measuring data: Click the corresponding tab in the workingarea selection.6.
Input the parameters which define the calibration gas in the "GSC Matrix"editor.• Use the commands of the related context menu to edit themeasurement tasks and masses.• Note: Use an identical name for the gas component in an MCDproject. Otherwise, QUADERA® cannot refer to this component. Asan example, QUADERA® does not equate "O2" and "Oxygen".NOTE:You can start the measurement regardless whether the recipe editor or theworking area has been selected.7. Start the measurement: In the device status view, click on the "Start" icon.The connection to the device is automatically established. The device nowreceives the parameters for the current measurement task.
The measurementis running automatically.8. In the GSC Result View, check the measured values and the calculatedcalibration factors.133QUADERA HTML Help9. Click Apply to MCD Calibration Factor Library to save the calibrationfactors in the MCD calibration factor library. Note:• New calibration factors are added to the MCD Calibration FactorLibrary,• Current values replace existing data sets in the MCD CalibrationFactor Library.10. When required for future applications: save the calibration project as template(menu File > Save as Template…).11.
Close and save the measurement project. In the File menu, click Close. Youare requested if you want to save the measurement project. QUADERA®suggests an automatically generated file name that is based on date/time ofthe measurement and the used template.• Yes: the "Save As" window used for saving measuring data opensup. Select a suitable name and path and then click Save.
Themeasurement project will be saved and closed.Please note: The file extension for measurement projects is *.qmp• No (recommended option): the measurement project will be closedwithout saving the data.• Cancel: the action is cancelled. You will return to the measurementproject without saving the data.134QUADERAGSC Matrix EditorThe parameters that define the calibration gas are displayed in the "GSC Matrix"editor of the calibration project. Each calibration gas component is defined by itsname, concentration, and the measurement task(s).
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