Furuno FR-2105-B - Manual (Page 31)

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Presetting pulselengths 1 and 2
Pulselength 1 and 2 can be preset on the PULSE WD 1 and 2 menus. Shown below are
examples of the pulselength setup procedure:
1. To enable selection of S1 (0.07 µs) and S2 (0.15 µs) pulselength on the 0.5 nm range on
FR-2115/2125/2115-B/2125-B model, select S1 at 0.5 nm on the PULSE WD 1 menu and
S2 at 0.5 nm on the PULSELENGTH 2 menu.
2. To enable selection of S2 (0.15 µs) and M1 (0.3 µs) pulselength on the 3 nm range on
FR-2115/2125/2115-B/2125-B model, select S2 at 3 nm in the PULSE WD 1 menu and
M1 at 3 nm in the PULSE WD 2 menu.
A longer pulse provides an increased detection range, but with reduced discrimination. If you
need discrimination in preference to detection, choose a shorter pulse.
Example: To select S1 (0.07 µs) as Pulselength 1 for the 0.5 nm range, display the
PULSELENGTH 1 menu following the steps shown above and hit the [2] key to choose "0.5
NM." Further hit the [2] key until the menu option "S1" is highlighted to the right of "0.5
NM."