DL107, DL207 and DL210 2.0 Digi-Loop™ DSP Induction Loop Amplifiers
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3. Calibrate the amplifier
to a field strength of 400 mA/m at 1 kHz, with FSM 5 ft above floor.
a. Set FSM switches - top button depressed out “Norm”, bottom button pushed in “0dB”.
A672
In (0dB)
Out (Norm)
b. Set or hold the FSM at 5ft above the floor, in the center of the loop or array.
c. Open the Calibration Window in the PC App.
A672
In (0dB)
Out (Norm)
d. Set the Frequency to 1 kHz, and adjust the volume level until the Field Strength Meter reads 0 dB.
A672
0 dB
Set at 1kHz
Adjust volume
e.
For Phased-Array only:
Switch to Loop B (by clicking on the “A” button) and turn up the volume until the current for Loop B
is close to Loop A (within 0.2A).
The loop amplifier is now calibrated. This is the 0 dB calibrated reference point that the EQ adjustments will reference. It
also makes the Input and Output VU Meters accurate.
The volume adjustment in the Calibration Window (test tone) should not be changed after this. Doing this will
take the amplifier out of calibration.
The EQ adjustments in the next step have their own level adjustment controls.
If more output is desired from the loop, the Source volume should be adjusted first, then the Input Sliders, then the Output
Effects AGC Control, in that order.
