GBS Elektronik MCA 166 - Manual (Page 30)

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the evaluation information (peak information, numeric calculations, ...) To enter the
evaluation screen, press F2.
Figure 10 Evaluation Screen.
A cursor (bold dotted line) is available on both screens and ROIs are indicated (intense
regions in between two dotted lines). ROIs may not overlap.
••••
To move the cursor, use right and left arrow key
••••
To mark a ROI, press the SHIFT key while moving the cursor
•••• To delete a ROI, move the cursor into the ROI and press the DELETE key.
Both screens have the same principal layout. The top line shows the path and filename
of the spectrum. On the left side the vertical full scale (VFS) is displayed together with the
Y scale mode (either automated linear, logarithmic or manual linear), change this with F6.
In addition, the ACQUIRE screen shows the remaining battery capacity of the MCA.
Under the spectra display, there are four lines with status information, some of them
appearing on both the ACQUIRE and EVALUATION screens (e.g. the cursor information,
ROI- resp. X-range and the dead time). If the cursor is within a ROI, its number and
boundaries are shown. On the EVALUATION screen is then additionally peak information
(integral, area, centroid and FWHM) shown. If the MCA is calibrated, peak information is
shown in keV (with F9 can be toggled between channels and keV), otherwise in channels.
The last row of the graphics screens shows the actual functions of the function keys.
(From left -F1- to right -F10- ; on the HP200LX the corresponding function keys are just
below the screen).
3.3.3.2 Energy calibration
Allows to perform a two point energy calibration. The calibration coefficients can be set as
numeric values (manual input, channel energy pairs), as cursor positions or as peak
centroids using the graphic screen.
E-Calibration
Use the spacebar to turn the energy calibration "on" or "off".
Peak-Position
Use the space bar to switch between the use of the peak centroid, the cursor position to
determine the peak location, or manual input of coefficients.