The Ampetronic CMR3 calibrated hearing loop measuring receiver for audio analysers is designed for measuring the performance of audio induction loop systems. The audio output is within ±0.25 dB over the frequency range and where used with a suitable audio analyser such as the Minilyser from Neutrik Ltd, the frequency response and field distribution of the magnetic field from any audio induction loop system can be plotted.
Calibrated to provide 0dBu output for a field strength of 400mA/m RMS, in accordance with the international induction loop Standard IEC60118-4 it is an essential tool for anyone wishing to assess loop system performance for analyses or certification.
Product Code:
TCMR03
| 400mA/m RMS | 0dBu audio output (0.775V) |
| Field strength | Coil orientation vertical as indicated on unit |
| 50Hz to 8kHz | ±0.25dB |
| 30Hz and 14kHz | -3dB |
| A-weighting filter | EN61672-1:2003 sound level meter (Switched) |
| Output variation over battery life | <0.1dB |
| Output variation due to loading | <0.1dB |
| Output variation over temperature range | <0.25dB |
| Overall gain variation | <0.5dB |
| Output type | Active Balanced |
| Load impedance | >600Ω |
| Connector | 3.5mm stereo jack socket |
| Battery | 2 x AA alkaline |
| Battery life | Approximately 200 hours |
| Battery condition | OK when LED illuminated |
| Dimensions | 62 w x 26 d x 112 h (mm) |
| Weight | 84g (excluding batteries) |
| Temperature range | -10°C to +45°C |
3.5mm stereo plug to XLR plug adaptor cable supplied (1.5m length), audio cables for simple interfacing of audio devices to loop systems available seperately (see product SCC)
The CMR3 is CE marked to all relevant safety and EMC standards
Angers, France
Seattle, Washington, USA
Chelmsford, UK
