Emerson Rosemount 3100 Series, Справочное руководство, Страница: 67 / 144

Reference Manual
00809-0100-4840, Rev. BA
July 2008
5-9
Rosemount 3100 Series
j) If the new value is incorrect, press the blue button
→
to exit to the menu.
The “
dEAd
” re-appears; re-start at step (b) or press
↓
for the next menu.
Setting the Frequency
(The 3102/3105)
Screen display:
F
Factory default value:
Auto
The frequency at which the transmitter operates is automatically chosen by
the microprocessor to ensure optimum signal size and performance.
“Auto” sets the frequency to obtain the best echo size and optimum
performance. The actual frequency being used by the transmitter can be
viewed in diagnostics (see page 5-3).
The limits of operating frequency are a function of the intrinsic properties of
the transmitter itself, and may be set to operate at any frequency between
49 and 58 kHz.
The transmit frequency affects the quality of the echo being received, which
may be used to improve a poor echo or reduce the quality of a false echo.
NOTE:
This menu option is in the engineering menu “
Eng
”. See “Accessing the
Engineering Menu (The 3102/3105)” on page 5-6 or see Figure C-4 on
page C-5 for a map of the menu structure.
To change the frequency:
a) After entering the “
Eng
” menu (see the note above), press the green
button
↓
repeatedly until “
F
” is indicated.
b) Press the blue button
→
to enter the frequency menu. The display
indicates the present frequency setting.
c) If this frequency is correct, press the red button
→
to exit to the menu.
(The menu option “
F
” re-appears. To get to the next menu, press
↓
.)
d) Press the blue button
→
to start the editing mode. The present frequency
setting flashes to indicate it can be edited.
e) Press the green button
↓
repeatedly to scroll through available options (49
to 58 kHz). (To restore the “
Auto
” setting, scroll past “
58 kHz
” and press
the red button
↵
to save and exit.)
f) Press the blue button
→
to confirm the new setting. (The flashing stops.)
g) If the new setting is correct, press the red button
↵
to save. The display
changes to the next menu option.
h) If the new setting is incorrect, press the blue button
→
to exit to the menu.
The “
F
” re-appears; re-start at step (b) or press
↓
for the next menu.