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1. OPERATIONAL OVERVIEW
1-22
3. Press the [-] or [+] key to set appropriate value in the setting window so that
interference disappears. The setting range for most transducers is -10.0% to
+10.0%. However the transducer listed below have different setting ranges.
50 kHz: -10% - +6%
67 kHz /68 kHz: -4% - +10%
107 kHz: -10% - +4%
200 kHz: -9% - +10%
The transducer having the frequency near 54-64 kHz, 112-122 kHz or
171-181 kHz has adjustment limitations. For example, the adjustment range
for 66 kHz is –2% - +10%.
If interference is still present, go to step 4, otherwise go to step 7.
4. Press the [▲] or [▼] key to close the setting window.
5. Press the [▼] key to choose HF•NOISE LIM or LF•NOISE LIM, whichever is
appropriate.
6. Press the [-] or [+] key to choose the noise rejection setting among N1, N2
and N3. N3 provides the highest level of interference suppression.
OFF N1
N2
N3
Signal level setting window
7. Rotate the [FUNCTION] switch to choose EXIT.
Note: Turn the noise limiter off when no interference exists, otherwise weak
echoes may be missed.
1.17 SHIFT/PROG Key
The [SHIFT/PROG] key is a “soft key” which the operator may program to
provide instant access to a function. Simply press the [+] or [-] key to access the
function programmed. An appropriate setting window appears. (The illustration
below shows the SHIFT window.) Then, press the [+] or [-] key again to select
desired setting.
SHIFT
0 ft
SHIFT window
You can select the soft key function with SHIFT/PROG on the USER menu, and
the default setting is “SHIFT.” For further details, see SHIFT/PROG on page
2-15.