Smart Avionics PB-4, User Interface Manual

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reverse capture order, the most recently captured spectrum being at the
top of the list. Clicking on the Time header reverses the order of the list.
Clicking on a row will display the selected spectrum. Clicking that row again
will display the spectrum details dialog for the selected spectrum where
you can enter a note for the spectrum if you wish.
If at the time a given spectrum was captured, the propeller/rotor RPM was
known, it will be shown to the right of the spectrum's capture time.
If a note has been entered for a spectrum, it will be displayed in the list. If
the spectrum doesn't have a note entered but a point that was captured in
the 10 seconds before the spectrum was captured does have a note, then
that note will be shown in square brackets [like this!]. The idea here is that
you can enter notes for polar points and those notes will then be shown in
both the polar point and spectrum lists.
4.3. Option buttons
To the right of the spectra list are some buttons:
4.3.1. Print Spectrum button
Clicking this button will create a new page in your browser showing the
currently selected spectrum and some textual information. If the currently
selected spectrum shows line labels, a list detailing the line labels will be
included. You can then print this new window using the normal browser print
page facility (e.g. type Ctrl-P).
4.3.2. Spectrum Options button
The Spectrum Options button toggles the display of the spectrum options
box (visible above), the options are:
• Drop down menus, Axis 1 and Axis 2 let you choose the axes to be included
in the spectra list.
• The Range button pops ups a menu that lets you choose the display's full
scale value. Setting it to Auto will automatically scale the display so that
the largest peak almost reaches the top. Setting it to one of the fixed values
makes it easier to compare spectra.
• The RPM / Line button pops up a menu from which you can select the
“width” (in RPM) of each spectral line. The available widths are 10, 20, 50
and 100. The trade off here is overall frequency range displayed versus
resolution. Also, the narrower the width of each line, the longer it takes to
capture each spectrum. So using 100 RPM per line gives the fastest update
rate and the widest range of frequencies displayed with the lowest
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Option buttons