Quadera Pfeiffer программа управления (1248465), страница 13
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The currently set massscale parameters are applied and displayed in the working area. Perform the tuningprocedure during the course of the measurement: Modify the parameters to adjustthe peak positions to the nominal mass numbers. You can observe the effect ofmodified parameters during the next cycle and iteratively tune the mass scale.113QUADERA HTML HelpCoarse Tuning of the Mass Scale1.
Feed a suitable calibration gas into the vacuum chamber. Use air if specialcalibration gases are not available.2. Open the start page: In the View menu, click Show Start Page.3. Click on the icon for the required device.4. Only for QMG700: Reset the fine tuning data points before starting the coarsetuning procedure of the mass scale. Fine tuning is applied to scan analogmeasurements and will affect the coarse tuning.5. Create a new calibration project: In the "Calibration and Tuning" list, doubleclick e.g. Mass Scale Tuning (Coarse).qmt.
This way you create a newcalibration project based on the selected template. You can modify it accordingto your needs.6. 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.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. You can adjust thechart layout while the measurement is running.8.
Adjust the actual peak positions to the nominal mass numbers: change theparameters in the section of the calibration project ("Mass Scale Tuning"editor) while the measurement is running. You can observe the effect ofmodified parameters during the next measurement task and iteratively tunethe mass scale.• "Mass Scale Offset" shifts the mass scale,• "Mass Scale Slope" shrinks and stretches the mass scale.8. Perform a fine tuning of the mass scale (if required). Otherwise, reset the finetuning values to the default values.9.
Stop the measurement: In the device status view, click on the "Stop" icon.114QUADERA10. 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 coarse tuning of the mass scale will be applied to all measurements.115QUADERA HTML HelpFine Tuning of the Mass ScaleNOTE:Perform the fine tuning of the mass scale exclusively within a coarse tuningprocedure.1. Feed a suitable calibration gas into the vacuum chamber. Use air if specialcalibration gases are not available.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 "Calibration and Tuning" list, doubleclick e.g. Mass Scale Tuning (Fine).qmt. This way you create a newcalibration project based on the selected template. You can modify it accordingto 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 theworking area 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. You can adjust thechart layout while the measurement is running.7. Define the data points for the linear interpolation of the mass scale ("MassScale Tune Fine" editor):a. Enter the nominal mass number in the "Nominal Mass" fields.b. Enter the measured mass number in the "Actual Mass" fields.8. Adding and deleting data points:• Press ENTER when you have input the mass numbers. This way youadd a row for a new data point.• Use the context menu of the "Mass Scale Tune Fine" editor to deletedata points.• Delete all rows in the editor if there is no need for mass scale finetuning: Click Delete Mass Scale Tune Fine Entries.9.
Stop the measurement: In the device status view, click on the "Stop" icon.116QUADERA10. 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 fine tuning of the mass scale will be applied to MID/MCD measurementsand to scan-stair measurements, and also to scan-analog measurementswith the QMG700.117QUADERA HTML HelpParameters for Coarse TuningTwo parameters are used for coarse tuning, to shift and to shrink or stretch the massscale. This way you can match the actual peaks with the nominal mass numbers.The "Mass Scale Tune Coarse" editor in the calibration project displays theparameters for coarse tuning of the mass scale.
Modified parameters are forwarded tothe device and take effect in the next measurement cycle.Image of "Mass Scale Tune Coarse" editor" (example)ParameterRangeDescription•Mass ScaleOffset-0.12 < Offset< 0.12Shift the mass scale to the left andright for negative and positive values,respectively.•Mass ScaleSlope0.985 < Slope< 1.015Shrink and stretch the mass scale forvalues < 1.000 and > 1.000,respectively.118QUADERAParameters for Fine TuningThe fine tuning is based on the coarse tuning and compensates nonlinearity of themass scale. You have to perform the fine tuning when the coarse tuning has beenchanged. Modified parameters are forwarded to the device and take effect in the nextmeasurement cycle.Data points on the mass scale have to be input for the fine tuning.
These points areused for linear interpolation of mass numbers located in between. The "Mass ScaleTune Fine" editor lists the data points in a table. Use the context menu of this editordelete data points.Image of "Mass Scale Tune Fine" editor (example)ParameterRangeDescription•Integer numberNominal mass number: Data point forthe interpolation.NominalMass•The listed values are sorted byincreasing nominal mass number,•Only one input is allowed pernominal mass.•Actual Mass+/- 0.5 amuaround thenominal massnumberMeasured mass number•Delete MassScale TuneFine EntriesButtonDelete the data points input by theuser in the "Mass Scale Tune Fine"editor.Context menu for the "Mass Scale Tune Fine" editorIn this context menu the following commands are available:•Delete selected rows: Delete the selected rows, i.e.
remove the data points.119QUADERA HTML HelpOffsetOffsetBasicsThe offset is caused by a drift of the measuring amplifier and can be compensated bya correction measurement. The measured intensity will be applied to futuremeasurement projects by subtracting it from the results of the correspondingmeasurement tasks. You cannot switch on and off the offset values for saved data.ProcedureThe measurement of the offset is performed by the device automatically. However,there is no real measurement. Instead, the offset of the electronic circuit of themeasuring amplifier is determined for each measuring range at a defined massnumber.
The values are automatically stored in the device and will remain after thepower has been cut.120QUADERADetermining the OffsetNOTE:Determine the offset for the electrometer preamplifier and detector, whichyou intend to use in the subsequent measurement:• QMG220: one electrometer preamplifier is used with both detectors (ifinstalled), i.e. there is only one set of offset values,• QMG700: individual electrometer preamplifiers are used with bothdetectors (if installed), i.e. there are two different sets of offsetvalues.1.
Open the start page: In the View menu, click Show Start Page.2. Click on the icon for the required device.3. Create a new calibration project: In the "Calibration and Tuning" list, doubleclick e.g. Offset Calibration.qmt. This way you create a new calibrationproject based on the selected template. You can modify it according to yourneeds.4. The new measurement project window appears. The working area displays thecalibration project.5.
Only QMG700:Select the detector corresponding to the measuring amplifier ("ElectrometerPreamplifier") whose offset is to be determined:• Faraday,• SEM.6. Edit the mass ("Offset Mass") for the offset measurement.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 measurementruns automatically and should take about 10…15 s.8. QUADERA® calculates the necessary offset values. The values areautomatically stored for the individual measuring ranges of the amplifier andapplied to future measurement projects.9. 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.
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