PLA DL210NET Digi-Loop™ DSP Induction Loop Amplifier
13
Phased-Array Calibration using front LCD (Phased Array Mode)
1. Master and Slave loop wire layout should follow parameters defined by blueprints and site survey findings.
2. Loop wire and lead wire DC resistance should be between .5 and 1.5 Ohms on both the Master and Slave loops.
3. Connect the Master Loop wire to the DL210 Phoenix connector and connect to Loop Output A.
4. Turn the power on, rotate the menu control clockwise and go to the configuration menu. Push the menu control to enter and select
output configuration and rotate menu control to Loop A. Scroll to set-up, click and select loop mode. Select Phased Array and
click to store setting.
5. Access System Configuration/tech tools/calibrate screen. Set the frequency to 1kHz and set the output level to Loop Output A
until it meets 400mA/m (using the field strength meter) at the center of the looped area. The current in the Master (A) should be
measured and then duplicated for the slave loop (B).
6. Connect the Slave Loop wire to the DL210 Phoenix connector and connect to Loop Output B. Adjust the current into Slave loop to
match the Master Loop.
7. Turn the power off.
8. Connect all inputs to be used into the DL210.
9. Turn the power on.
10. This field strength at 1kHz should be 3dB at any point within the loop area to meet the IEC 60118-4 standard.
To meet the
IEC 60118 Standard
:
Field strength: 400mA/m audio peak response at 1kHz (Calibration Point)
Frequency response: 100 - 5000Hz ±3dB relative to 1kHz Calibration Point (achieved through Equalization)
Note: The lead length from the amplifier to the loops should be kept as short as possible.
Note: The amplifier must be calibrated to the loops before adjusting the Output Effects.
Figure G: Phased-Array Concept
A492
Perimeter Loop
Single Array
Phased Array (Low Overspill)
Ultra Low Overspill
Cancellation Loop
Master Loop
Slave Loop
Master Loop + Slave Loop = Phased Array
Cancellation
Loop
Main
Loop
Limits overspill
in this direction
Tighter loop elements = more spill control
Loop Amplifier
Loop Amplifier
Loop Amplifier
Loop Amplifier