69
58-603 Pulsar
®
Model R86 Radar Transmitter
MODIFICATION
The Custom Echo Rejection curve can be modified in three ways:
1. Modify existing Echo
Changing the amplitude or width of an existing echo in the Custom Rejection Curve is one the most
typical uses of this method. For example, it can be used to account for the variations in mixing blade
operation. If mixing blades are stopped when the initial curve was created, the next time the blades
stop they may be in a slightly different position. The new blade position can result in a slightly differ-
ent position of its echo. Echoes from the blade will appear in the echo curve as slightly shifted to the
left or right compared to the echo in the original curve. The amplitude may also be somewhat differ-
ent. In that case, expanding the width of the existing echo, or changing its amplitude would create an
echo rejection curve that encompasses both the original echo and the new echo locations.
2. Add an Echo
This is used to copy an echo from the live curve to the Custom Rejection Curve. This would be done
in the event that a new echo was found in the live curve after the initial echo rejection curve had been
saved.
NOTE: In the case where the level at the time was higher in the tank, saving a new entire echo rejection curve would
result in a lower portion of the rejection curve being lost. Therefore, it is beneficial in that circumstance to
be able to add the echo to the existing custom curve so that the lower portion of the curve is retained.
3. Reset Custom Curve
If the need arises to eliminate changes made during any of the previous modification procedures, Reset
Custom Curve is used to reset the Custom Rejection Curve back to its original values.
PROCEDURES
Changing the amplitude of an existing echo
Modifying an existing echo in the custom rejection echo curve consists of the user identifying the
desired echo and defining the amplitude to be made to that echo. The user starts the Customize
Rejection Curve method in the DTM at Diagnostics/ Echo Curve/
1. Ensure a Standard Echo Rejection has been captured before continuing (Standard Echo Rejection will
appear as red curve on graph)
2. Change “Echo Rejection Type” from “Standard” to “Custom”
3. The “New Rejection Curve” button changes to “Modify Rejection Curve”; press button
4. Choose “Modify Existing Echo”
5.
6.
7. Upon presentation of the Rejection echo list (including the echo amplitudes), along with a display of
the present level, select the desired echo to be modified. (The distance to the echo must be smaller
than the distance to the level echo).
8. Enter the new peak amplitude for the echo. Note that this amplitude can be smaller than the original
amplitude if it is desired to reduce an echo height.
