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Navigating Spectrum Mode
The MESA unit is capable of scanning and displaying a large portion of the RF spectrum. To fully analyze
the RF energy in a given location, it may be necessary to focus on smaller portions of the RF spectrum at
a time. This can be accomplished by using one of several available methods:
1. Double-tap to Zoom In - Double-tap anywhere on the spectrum to zoom in with the spectrum
centered around the frequency tapped on
2. Zoom In/Out using the Zoom In/Out on-screen buttons press the Zoom In and Zoom
Out on-screen buttons to zoom in or out. When zooming in, the center frequency will remain
the center frequency. When zooming out, the center frequency will remain the center
frequency, if it can be centered at the new frequency span. If not, the center frequency will
become the center frequency of the new span. Press and hold the Zoom In button to jump to a
500 kHz span. Press and hold the Zoom Out button to jump to the maximum span supported by
the connected probe.
3. Click & Drag - Pan: If the spectral display is not currently set to maximum span, clicking on the
right side of the spectral display, and dragging to the left will pan the spectral display to higher
frequencies. Clicking on the left side of the spectral display and dragging to the right will pan the
spectral display to lower frequencies. The SPAN parameter will remain constant, but the START
and STOP parameters will change as the spectral display pans.
4. Click - Cursor Move: Tap with a finger anywhere within the spectral display to move the cursor
to that frequency. For a brief moment, the cursor will appear as a vertical line stretching from
the top of the screen to the bottom of the screen to make the cursor easier to see. However,
upon lifting finger from the screen, the cursor will again become a short, down-ward facing
arrow.
5. Click & Drag - Cursor Adjust: For slightly finer adjustment control of the cursor movement, tap
anywhere on the screen and hold until the vertical line cursor becomes a thicker vertical line.
With the cursor displayed as a thick vertical line, move finger to the left or right to adjust the
cursor. This method of adjusting the cursor is affected by the Snap-to-Peak feature.
6. Snap-to-Peak: If the Snap-to-Peak feature is enabled, the cursor will automatically snap to a
nearby peak in the live trace (when the cursor is released) after adjusting the cursor position by
using the clicking and dragging method. The feature is enabled by default but can be enabled or
disabled in the System Menu (see page 102).
7. Cursor Adjust: For the most precise cursor adjustment, tap the Cursor Frequency box at the top
center of the spectrum to open the Cursor Frequency
dialog. Enter a new frequency for the cursor. The
cursor will move to the new frequency with the screen
centered on the cursor.
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