CMR3 calibrated measuring receiver

The CMR3 calibrated receiver 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.

Williams AV is proud to offer Ampetronic Loop products in the United States and Canada. To purchase Ampetronic loop products in other countries, please visit

Magnetic field response 400mA/m RMS: 0dBu audio output (0.775V) Field strength: Coil orientation vertical (indicated by h)
Frequency response 50Hz to 8kHz: ±0.25dB
30Hz and 14kHz: -3dB
A-weighting filter: EN61672-1:2003 sound level meter (Switched)
Gain stability Output variation over battery life Output variation due to loading [lt]0.1dB
Output variation over temperature range [lt]0.25dB
Overall gain variation [lt]0.5dB
Output Output type: Active Balanced
Load impedance: [gt]600Ω
Connector: 3.5mm stereo jack socket
Power 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)
Temperature range -10°C to +45°C
Weight 84g (excluding batteries)


5 Years

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