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Reference Manual
00809-0100-4840, Rev CB
Section 5: Service and Troubleshooting
February 2015
Service and Troubleshooting
5.5.2 Setting the threshold (on the 3102/3105)
Screen display: t.hoLd
Default: Auto
False echoes are rejected below the threshold value. “Auto” sets the threshold level for optimum
performance based on echo sizes being received. A value up to 99 may be entered. However, a
large value will have the effect of stopping false echo processing (see “Echo diagnostic” on
page 60).
Note
This menu option is in the engineering menu “Eng”. See “Accessing the engineering menu (on
the 3102/3105)” on page 62 or see Figure C-5 on page 106 for a map of the menu structure.
To change the threshold value:
1. After entering the “Eng” menu (see the note above), the first menu option indicated is
“t.hoLd”.
2. Press the blue button
to enter the menu for “t.hoLd”.
The display indicates the present threshold value.
3. If the threshold value is correct, press the red button
and then press the green button
to get to the next menu option. Otherwise, continue with step (4).
4. Press the blue button
to start the editing mode.
If the present setting is “Auto”, press the green button
to change to a three digit
number. The first of the three digits flashes to indicate a number can now be edited.
5. Press the green button
repeatedly to edit the flashing digit.
(To restore the “Auto” setting, scroll past “9”, press the red button
and then press the
green button
to get to the next menu option).
6. Press the blue button
to move to the next digit. The digit flashes to indicate it can be
edited.
7. Repeat steps (5) and (6) until the last digit is flashing, and edited as required.
8. Press the blue button
to confirm the new value. (The flashing stops).
9. Press the red button
to save the new value if it is correct, or press the blue button to
not save. Afterwards, depending on the button pressed, either the “t.hoLd” menu or
the next menu appears.