The CMR3 Calibrated Measuring Receiver is designed for measuring the performance of audio frequency induction loop systems in accordance with the requirements of the international defining standard EN 60118-4.

This standard establishes the target field strength and frequency response of the induction loop system within the usable area.

Tolerances are established for the various parameters

The standard flat foil cable supplied by Ampetronic is 18 mm (0.71inch) wide, with a copper section of 1.8 mm². The cable is supplied in 50 metre (160 ft) reels.
The construction of the cable is copper foil of 0.1 mm thickness, covered in bonded Polyester film. Total thickness is 0.25 mm (0.01inch).

The FSM is a cost effective and simple solution for measuring, setting up and commissioning an induction loop system to the requirements of IEC60118-4:2006. The meter is an ergonomically designed hand held instrument for measuring loop system performance.

Area coverage to >200m2
Low lifetime cost
Excellent proven reliability
5 year warranty
Unrivalled intelligibility
VOX switching configured to prioritise Mic 1 input
Built in tone control
Very compact 216 x 124 x 44mm
2 microphone inputs (electret)
1 line input twin phono (RCA) connectors for TV / hi-fi connection

Very high output for the largest applications
High efficiency class-G amplifier with low heat dissipation
Very compact 1U rack mount, wall mount or free standing
Versatile input selection
1 XLR microphone
1 XLR mic / line switchable input
1 6.3mm jack line input
Low lifetime cost
Excellent reliability
5 year warranty
Unparalleled sound quality
Metal loss corrector

Robust industrial housing and vibration protection
5 year warranty
2 transformer isolated inputs (low impedance speaker line and 100V line options)
Metal loss correction
Battery backup option
Free support and installation advice
Full area coverage to IEC60118-4

Area coverage > 400 m2
Low lifetime cost
Excellent proven reliability
5 year warranty
Unparalled sound quality
Excellent intelligibility
Speech optimised gain control
High voltage headroom avoids high frequency clipping
Metal loss corrector corrects frequency dependent loss from metal structures
Very compact: 215 x 210 x 44mm
Microphone (XLR) and line inputs