Operating Manual

Accu-Wave Chapter 5 Radar Fine Tuning
TN Technologies 5-9
“Response Time, Lost Echo and Agitator Reject Setup” Menu
Display Comments
Level Signal
time constant
4 seconds
NEXT↓↓ HELP→→
Time constant for smoothing filter applied to the
primary measurement (level or distance). Range of
time constant value is from 1 to 1000 seconds. The
longer the time constant, the greater the smoothing,
and the slower the response of the system. Default
value is 4 seconds.
Direct Entry Code: ‘007004’
echo loss mode is
hold last value
NEXT↓↓ CHANGE→→
When in “lost echo” mode (when gauge loses the
return signal), display reports: “Echo lost.” Select one
of the following actions:
hold last value
go to hold value (enter value in next menu item)
go to maximum possible distance
go to zero distance point
Direct Entry Code: ‘142002’
Level hold mode
& lost echo value
0.000 ft level
NEXT↓↓
Only displayed when “go to hold value” is selected
for the echo loss mode in the previous menu item
Direct Entry Code: ‘037003’
time after echo
lo
ss before going to
lost echo mode
4 seconds NEXT↓↓
Delay time between echo loss and switch to “lost
echo” mode. During this period display will report:
“Waiting for echo.” Enter the length of time the
gauge waits before going to the signal loss mode
selected above. The default is 4 seconds.
Direct Entry Code: ‘029004’
Agitator reject time
1.000 sec
(range gate delay)
NEXT↓↓ HELP→→
Agitator reject time is the delay time before accepting
an echo outside the range gate. The range gate is a
window that moves with the “measured” level.
During this period display reports: “Waiting good
echo.” Used to reject false echoes caused by an
agitator blade passing through the signal.
Direct Entry Code: ‘044003’
height of range gate
(moving window)
0.000 ft
NEXT↓↓ HELP→→
Enter height of range gate which is centered on the
distance measurement readout. A larger window will
admit a larger number of signals as possibly valid. If
this variable is set to 0.0, the gauge will use the
default value of 25cm (± 12.5cm) range window.
Direct Entry Code: ‘019003’