Perimeter Loops – Area Coverage (maximum)
| Room aspect ratio |
1:1 |
2:1 |
3:1 |
| Maximum area m2 |
420 |
525 |
700 |
For any Induction Loop System, area coverage is dependent on several factors. Please check these assumptions and contact Ampetronic for advice if required:
- Loop must be 1-2m above or below the receiver height
- There should be no metal structures in the plane of the loop
- Sufficient voltage to drive the loop – check the cable table below
Maximum Cable Length
The ILD500 is designed for SINGLE TURN loops for optimum audio quality.
- Loops with DC resistance from 0.3 to 2.0Ω
- Impedance up to a maximum of 2.2Ω
Maximum cable length is dependent on cable type and on the application:
| Cable type |
Maximum Cable Length (m) |
|
Normal Use* |
Transient Speech* |
| 1.0mm2 copper |
83 |
96 |
| 2.5mm2 copper |
114 |
145 |
| 4.0mm2 copper |
118 |
154 |
| 1.8mm2 flat copper tape |
147 |
170 |
* Short term speech (e.g. service counter, airport PA system) can cope with limited clipping at high frequencies – Ampetronic recommends delivery of full current up to 1.2kHz for these applications.
Longer term usage or signals with music or high quality audio must deliver full current to at least 1.6kHz to prevent fatigue and give acceptable intelligibility. Many commercially available systems do not deliver sufficient voltage to reproduce critical high frequencies – ask us for more details.
ILD500 Specifications
INPUTS
| Power |
85W 230V AC nominal, 45-65Hz [120V option available]
Power switch and LED indicator on front panel |
| Microphone input |
XLR balanced microphone input for 200-600Ω microphones;
15dB user selectable gain boost; + 15V DC phantom power (selectable); sensitivity – 70dBu; front panel recessed gain control |
| Line input |
6.4mm jack socket balanced line input; sensitivity – 30dBu; overload protected; front panel recessed gain control |
| Link I/O |
6.4mm jack insert point for connection of SP5 phase shifter
0dBu signal can be used for recording |
OUTPUTS
| Drive voltage |
17.0 Vrms (24.0Vpk) at maximum output current |
| Drive current |
6.4 Arms (9.0Apk) continuous 1kHz sine wave
Short term peaks: >13A
Front panel recessed control
Drive current indicated on 6-LED display in 2dB increments |
| Loop connector |
Neutrik NL4 (supplied) |
| Loop Monitor |
Provides access to actual audio signal in loop
3.5mm stereo headphone connector on front panel |
| Freq. response |
80Hz to 6.5kHz |
| Distortion |
THD+N |
| Automatic Gain Control |
The AGC is optimised for speech. Dynamic range >36dB
Front panel recessed input level control |
| Metal loss correction |
Corrects system frequency response due to metal structures in a building. Gain constant at 1kHz, adjustable gain slope from
0 to 3dB per octave.
This does not compensate for signal loss from metal structures which can be significant. |
ADDITIONAL FUNCTIONS
| Fault Monitoring |
Three LED fault indicators on the front panel;
• Overload – delivering over the rated current
• Overheat – unit is too hot (mutes output signal)
• Loop error – short circuit / open circuit error |
| Ancillary |
To supply Ampetronic ancillary units
±15V DC 0.15A power outlet on rear panel |
| Cooling |
Forced ventilation. Air intake on left panel, air ejection at rear |
PHYSICAL
| Dimensions |
Full width 1U 19″ rack mount.
Width 430mm Depth 220mm Height 44mm |
| Mounting options |
Freestanding
1U 19″ rack mount (brackets included)
Wall mounting (requires additional brackets) |
| Weight |
3.75kg |
| Environment |
IP20 protection; 20 to 90% relative humidity; 0 to 35ºC |
