783620H / 1013 9. KEYBOARD FUNCTIONS
9.2.6. Jump (Sixteenth Screen Width) <PageDown>/<PageUp>
<PageDown> and <PageUp> jump the marker position to the left (to lower channel numbers) or right (to higher channel numbers), respectively, 1/16 of the window width, regardless of the horizontal scale. The status of the ROI bit is not altered when the marker is moved with these keys, that is, the Mark/UnMark/Off state is ignored. The marker channel contents and Marker
Information Line are continuously updated as the marker jumps, so when the jump is complete, the marker information is up-to-date for the current channel.
9.2.7. Insert ROI <Insert> or Keypad<Ins>
These keys mark an ROI in the spectrum, at the marker position, in one of two ways:
1) If the spectrum is calibrated, the region is centered on the marker with a width of three times the calibrated FWHM. There does not need to be a peak at the marker position.
2) If the spectrum is not calibrated, the region is centered on the peak, if any, located within two channels of the marker and is as wide as the peak. If the peak search fails, or if the peak is not well-formed, no ROI is marked. There is no limit on the size of a peak or ROI; therefore, in some uncalibrated spectra, large ROIs could be marked.
These accelerators duplicate the function of the Mark ROI toolbar button and the ROI/Mark
Peak menu selection (see Section 5.8).
NOTE
<Insert> and Keypad<Ins> work conveniently in combination with <Ctrl +
7
> and
<Ctrl +
6
> to rapidly set peak ROIs.
9.2.8. Clear ROI <Delete> or Keypad<Del>
<Delete> and Keypad<Del> clear the ROI bits of all ROI channels contiguous to the channel containing the marker. These accelerators duplicate the function of the Clear ROI button on the toolbar and the ROI/Clear menu selection (see Section 5.8).
9.2.9. Taller/Shorter <
8
>/<
9
>
The <
8
> and <
9
> keys decrease or increase the vertical full scale of the displayed spectrum so the peaks appear taller or shorter, respectively. The minimum is 32 counts-full-scale; the maximum is 1024 million counts. Each successive key press doubles or halves the full scale until the maximum or minimum is reached. Whenever the maximum full-scale value is reached, the next
<
8
> key press switches to logarithmic scale. If the display is already in logarithmic scale, the display switches to linear scale. In either case, the vertical full-scale value is always shown on the toolbar.
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