GBS Elektronik MCA 166 - Manual (Page 36)

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The amplitude spectrum is shown on a third graphical screen, which can be entered from
the evaluation screen by pressing F5.
A cursor (bold dotted line) is available on all three screens and ROIs are indicated
(intense regions in between two dotted lines).
••••
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.
All three 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 screen
(e.g. the cursor information, ROI- resp. X-range). If the cursor is within a ROI, its number
and boundaries are shown. On the EVALUATION screen is then additionally information
(integral, ROI integral) shown.
The MCA-evaluation screen shows amplitude information. If the MCA is calibrated, peak
information is shown in keV (F9 toggles 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).
3.4.3.2 Smooth
Allows to smooth a spectrum. The smoothed spectrum overwrites the original spectrum.
Use the space bar to switch between a 3 or 5 point smoothing.
3.4.3.3 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.
Channel 1
Enter lower channel number (in manual mode only) and the corresponding energy
Channel 2
Enter upper channel number (in manual mode only) and the corresponding energy
Do visual calibration (not in manual mode)
Switches to a graphic screen to do the energy calibration. In cursor mode it is asked for
two cursor positions, in centroid mode it is asked for two calibration peak ROIs.