ORACLE SERIES 2E, 2EC, 4E, 4EC, 4H
Operations Manual
Eberle Design Inc.
Page 11
in the middle of the screen showing both graphically and numerically the change in
inductance strength as vehicles pass over the loop.
3.2.1.1 ADJUSTING SENSITIVITY USING THE DEFLECTOMETER
®
The DEFLECTOMETER
®
Pie Graph and Numeric Indicator should be blank with no vehicle
over the roadway loop. When a typical vehicle is completely in the detection zone
(DETECT indicator On), the sensitivity should be adjusted up or down until the
DEFLECTOMETER
®
Pie Graph is shaded to the halfway position and the
DEFLECTOMETER
®
Numeric Indicator (right side of the Pie Graph) is displaying the value
Ten (10). The detector is now set to the most optimum sensitivity level for the existing loop
network.
NOTE: The DEFLECTOMETER
®
Streaming Graph is another visual aid when setting
sensitivity to the most optimum position. This is located below the DEFLECTOMETER
®
Pie
Graph and Numeric Indicator. Whether the Pie Graph or Numeric Indicator was used to
reach the optimum sensitivity value, the Streaming Graph is now equal to the dotted
reference line.
If a typical vehicle located over the roadway loop causes the value of “12” to be displayed
on the DEFLECTOMETER
®
, the sensitivity should be decreased two levels. This can be
done by pressing the front panel “SCROLL (Up/Down) toggle switch DOWN two times. The
DEFLECTOMETER
®
Pie Graph and Streaming Graph are visually showing that the
detector is now set to the most optimum sensitivity level.
If a typical vehicle located over the roadway loop causes the value “5” to be displayed on
the DEFLECTOMETER
®
, the sensitivity should be increased five levels. This can be done
by pressing the front “SCROLL (Up/Down)” toggle switch UP button five times. The
DEFLECTOMETER
®
Pie Graph and Streaming Graph are visually showing that the
detector is now set to the most optimum sensitivity level.
Note that when operating in the Probe mode (see 2.1.4.1) the 50% pie graph level is
reported as a value of 8 instead of 10.
3.2.1.2 ADJUSTING SENSITIVITY WITHOUT USING THE DEFLECTOMETER
®
The ORACLE offers 20 levels of sensitivity (1 to 20). Level 20 is the highest sensitivity.
From the “SET UP” or “QUIK SET” menu options, sensitivity can be selected and manually
set to any desired level by pressing the front panel “SCROLL (Up/Down) toggle up or down.
The new sensitivity value will be displayed on the LCD. The factory default Sensitivity
setting is level 10.
3.2.2 FREQUENCY
The LCD screen displays the actual loop frequency to help avoid interference which may
occur when loops connected to different detectors are located adjacent to one another.
One of eight (8) settings (normally in the range of 20 to 60 kilohertz) may be selected via
the “SET UP” or the “QUIK SET” menu options. The LCD screen also displays a frequency
stability meter (XY Graph) that allows you to analyze each frequency level to ensure proper
selection of frequency levels. The XY graph displays samples with respect to the reference.
The channels reference is in the center of the graph. A variation from the center of the
- NOTE -
THE DEFLECTOMETER
®
DYNAMICALLY UPDATES AFTER EACH SENSITIVITY
LEVEL CHANGE, ALLOWING CHANGES TO THE SENSITIVITY SETTINGS WHILE
A VEHICLE REMAINS IN THE LOOP DETECTION ZONE.