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2.1 SET THE SENSITIVITY LEVEL

The DEFLECTOMETER (front panel 7-segment LED display) aids in setting the detector to

the most optimum sensitivity level to ensure the detection of all vehicles, including

motorcycles and high bed vehicles.

 While the LMD Series unit is in the Call state (DEFLECTOMETER = 1-9), the

DEFLECTOMETER displays the Call Strength (1 – 9). The Call Strength will

increase or decrease one step as the Sensitivity Level is increased or

decreased one step.

 The Call Strength value will depend on the size and type of vehicle in the

detection zone as well as the Sensitivity Level setting of the channel. The

optimum value for a mid-sized vehicle is 5.

 The procedure in section 2.1.1 provides a quick and simple way to program

the Sensitivity Level to the optimum setting to ensure all classes of vehicles

are reliably detected with one simple step.

 The resulting Sensitivity Level can be then be displayed using the procedure

in section 2.1.2. While the LMD Series is in the No-Call state

(DEFLECTOMETER = 0), the DEFLECTOMETER will display the Sensitivity

Level (1 – 9) when either SENS button is pressed once.

For typical vehicles (mid-size vehicle / small pick up) utilizing properly installed roadway

loops, when the Call Strength value 4, 5, or 6 (5 being optimum) is displayed on the

DEFLECTOMETER during the DETECT output period then the sensitivity level is set

correctly. For high profile vehicles (commercial trucks, 4x4's, etc...), a DEFLECTOMETER

Call Strength value of 4 will be best. For low profile vehicles (sports cars, etc...), a

DEFLECTOMETER Call Strength value of 6 will be best.

2.1.1 ADJUSTING SENSITIVITY USING THE DEFLECTOMETER (RECOMMENDED)

The DEFLECTOMETER should read zero (0) with no vehicle over the roadway loop. With a

typical mid-sized vehicle in the detection zone (DET indicator On), the DEFLECTOMETER

will display the Call Strength value (1 - 9).

If a mid-size vehicle, located over the roadway loop causes the Call Strength value "7" to

be displayed on the DEFLECTOMETER, the sensitivity should be lowered two levels (7 – 2

= DEFLECTOMETER reading "5"). This is done by pressing the front panel SENS (down)

button twice.

If a mid-size vehicle, located over the roadway loop causes the value "2" to be displayed on

the DEFLECTOMETER, the sensitivity should be increased three levels (2 + 3 =

DEFLECTOMETER reading "5". This is done by pressing the front panel SENS (up)

button three times.

NOTE: The DEFLECTOMETER dynamically updates after each Sensitivity Level

change, allowing changes to the Sensitivity setting while a vehicle remains in

the loop detection zone. Note that the Call Strength value may be different than

the actual Sensitivity Level setting.

2.1.2 ADJUSTING SENSITIVITY DIRECTLY

The LMD Series offers nine levels of sensitivity (1 to 9). The Sensitivity Level can be

manually set to any desired level by pressing the SENS or SENS front panel buttons

Eberle Design Inc.

LMD602 and LMD604 Series

Operations Manual

Section 2

Installation and Adjustments

Page 3