PLA DL210NET Digi-Loop™ DSP Induction Loop Amplifier
12
Dual Loop Calibration using front LCD (Dual Loop Mode)
Note: this mode is also used for a single loop; in this case steps referring to Loop B can be skipped.
1. Define the areas needed for the loop layout.
2. DC resistance for each separate loop with lead wire should be between .5 and 1.5 Ohms.
3. Connect loop wire to the DL210 Phoenix connectors and connect to Loop Outputs A and B.
4. Connect all inputs to be used into the DL210.
5. Turn the power on.
6. Rotate the menu knob clockwise and go to the configuration menu. Push knob to enter and select output configuration and turn
rotary selector to Loop A. Scroll to set-up, click and select loop mode. Select dual loop and click to store setting.
7. Going back to the Configuration Menu, select System Configuration page in the menu and select tech tools, then select calibrate.
Scroll down to the frequency, click and select 1 kHz.
8. With the field strength meter set appropriately, measure the field strength at the mid-point of the loop. Adjust the volume (one step
down in the calibrate page) until the field strength measures 0dB (400mA/m).
9. Rotate the menu knob clockwise and go to the configuration menu. Push knob to enter and select output configuration and turn
rotary selector to Loop B. Scroll to set-up, click and select loop mode. Select dual loop and click to store setting.
10. Going back to the Configuration Menu, select System Configuration page in the menu and select tech tools, then select calibrate.
Scroll down to the frequency, click and select 1 kHz.
11. With the field strength meter set appropriately, measure the field strength at the mid-point of the loop. Adjust the volume (one step
down in the calibrate page) until the field strength measures 0dB (400mA/m) with a field strength meter.
12. This field strength reading 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 F: Dual-Loop Concept
A494
Perimeter Loop
Loop Amplifier
Perimeter Loop
Loop Amplifier
Speaker
Perimeter Loop
