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Ask The Expert – How to Set Up LMA Deflectometer® Series

The wide range of Eberle Design DEFLECTOMETER® series vehicle detection products help technicians save valuable time and maximize profits by quickly installing, accurately trouble-shooting, and reliably maintaining access control systems with easy to use hi-tech vehicle detectors.

The DEFLECTOMETER® detectors provide a built-in frequency meter, detection “CALL” strength meter, and non-volatile memory to maintain diagnostic history, all of which are invaluable and always available. The LMA Series of Access Loop Detectors uses an intuitive push-button interface with a 7-segment LED DEFLECTOMETER® located on the front panel providing a visual and quantitative feedback for the installing or maintaining technician.

Sensitivity Meter: Nine levels of sensitivity (1 to 9) can be easily set using the UP or DOWN push buttons. This adjustment can be made dynamically while the target vehicle remains in the detection zone. This eliminates the trial and error method of setting and resetting Sensitivity with conventional DIP switch based products.

Detection (Call) Strength: The DEFLECTOMETER® functions as a Detection Call Strength Meter. With a typical passenger size vehicle over the roadway loop, the sensitivity setting should be setup to provide an optimum Call Signal Strength report of “5”. The DEFLECTOMETER® Sensitivity reading is set by using the front panel UP or DOWN sensitivity buttons without moving the target vehicle so that the loop detector is set to the most optimum sensitivity level to detect ALL vehicles classifications, including motorcycles and high-bed vehicles, without needing to test each class at the installation.

Built-in Frequency Meter: Following power-up or reset, the DEFLECTOMETER® will indicate a 2 or 3 digit number (quickly flashes) that indicates the loop frequency of the loop & loop network. Keeping physically adjacent loops separated by at least 5 KHz avoids crosstalk problems and future service calls.

Advanced Loop Diagnostics: The Loop Fault Monitor continually checks the integrity of the loops and will report and store three types of loop faults; Open Loops, Shorted Loops, and 25% sudden changes in inductance.

Delay & Extension Timing: Depending on the application needs, a Delay time can be applied to condition the start of the detection Call by 2 seconds. The detection Call output can also be extended by 2, 5, or 10 seconds.

The LMA Series Loop detectors are simple to install and configure. The DEFLECTOMETER® features eliminate the usual “trial and error” and multi-vehicle process of conventional detectors whereby a setup exercise consists of two simple steps using one passenger vehicle parked in the detection zone.

  1. Optimizing Frequency between two LMAs
    • Set both LMA units to the High frequency setting (DIP #1, #2 Off).
    • With all detection zones vacant, press the RESET button of each LMA and record the resulting Frequency values.
    • Adjust the frequency of the LMA with the lowest frequency value to Low frequency setting (DIP #1, #2 On). Reset this LMA and ensure that the new resulting frequency value is at least 5KHZ below the other LMA for best operation.
  2. Optimizing Sensitivity
    • With a typical passenger vehicle in the detection zone, the DEFLECTOMETER® will display the Detection Call Signal Strength value of 1 through 9. The optimum value for a typical mid-sized vehicle is 5.
    • If a mid-size vehicle shows the Detection Signal Strength value 7 on the DEFLECTOMETER®, the “sensitivity” should be lowered two levels (7-5 = DEFLECTOMETER® reading 5). This is accomplished by pressing the front panel SENS▼ (down) button two times.
    • If a mid-size vehicle shows the Detection Signal Strength value 2 on the DEFLECTOMETER®, the “sensitivity” should be raised three levels (2+3 = DEFLECTOMETER®reading 5). This is accomplished by pressing the front panel SENSp (up) button three times.
    • The DEFLECTOMETER® dynamically updates after each Sensitivity change, eliminating the need to move the vehicle out of the loop zone and bring it back in for each Sensitivity level change.

Note: If the detector is in the Call state (1:10) then the DEFLECTOMETER® is reporting detection Call Strength. If the detector is in the No-Call state (0) then the DEFLECTOMETER® is reporting Sensitivity Level.

Setup of the LMA is now complete and optimized to detect all classes of vehicles!