FSMETER  Field Strength Meter FSMETER Field Strength Meter
4.5 stars - "Review for FSMETER Field Strength Meter" This FSMETER Field Strength Meter is the best Support Products I have tried.
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  • FSMETER  Field Strength Meter - Image 1
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FSMETER Field Strength Meter

Brand: Ampetronic

View or buy the Support Products Assistive Listening Systems - FSMETER Field Strength Meter from Ampetronic to discover other options and shipping details.


Field Strength Meter

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. There are three calibrated operational modes for the assessment of Background Noise, Field Strength and Frequency Response as required to ensure correct function of the loop system. The meter also doubles as a loop listener, with a headphone output to listen to the signal in the loop.

The meter is supplied in a soft case with an audio CD with the required test signals, and full operating instructions including a guide to commissioning. The Ampetronic FSM can be used to monitor, set up or commission any induction loop system regardless of the manufacturer or type.


  • Simple assessment of any system to

  • Three modes of operation for three test types

  • A-Weighted background noise • Broad band mode (50Hz - 8kHz)

  • Frequency response (100Hz, 1kHz, 5kHz)

  • True RMS detection calibrated to
    400mA/m = 0dB

  • Wide viewing angle LED display

  • Colour coded LEDs for simple readout

  • Resolution to 1dB

  • Head phone output with volume control

  • Ergonomic, rugged, light weight construction

  • Test signals supplied on CD

  • Soft carry case

  • 5 year warranty

Applications include
  • Accurate set-up and commissioning

  • System monitoring and maintenance

  • Site surveys

  • Certification to IEC60118-4:2006

  • Assessment of frequency losses due to metal

  • Assessment of loop coverage and overspill

  • Assessment of background noise


Included Accessories


Optional Accessories

Set of cables to easily interface audio inputs to loop systems Order code SCC

Operational modes

Background Noise

To determine the level of the background magnetic field present in the intended location for the loop system. Also used to measure low level signals to assess overspill outside a loop system.

  • A-Weighted filter

  • True RMS detection referenced to 400mA/m

  • Scale -42 to -12dB

  • Audio (headphone) output is post filter for monitoring


Field Strength

A broad band measurement to measure field strength delivered by the system.

  • Broad band measurement 50Hz to 8kHz

  • True RMS detection referenced to 400 mA/m

  • Scale -22 to +8dB with 1dB intervals from -3 to +6dB

  • Suitable for use with sine wave, pink noise, or combination signals (provided), or any other real signals


Frequency Response

Third octave filters for measuring performance across the required frequency spectrum as required by IEC60118-4.
Used to confirm adequate power at high frequencies as required for good intelligibility. Used to assess frequency dependent loss due to metal structures, and to optimise frequency compensation.

  • Third octave bands at 100Hz, 1kHz and 5kHz

  • True RMS detection

  • Scale resolution to 1dB

  • For use with pink noise only (signal provided)

  • Audio (headphone) output is post filter



Magnetic field measurement

Coil orientation

Vertical when unit held upright

Reference level

400mA/m (In Field strength mode)

Frequency response

50Hz to 8kHz ±0.25dB

30Hz to 10kHz -3dB

Gain stability

Better than 0.5dB over all conditions



Flying spot LED bar graph with wide viewing angle

Colour coded (green for -3dB to +3dB)

Audio (headphone)

16Ω min (32Ω per side)

3.5mm stereo jack connector



2 x AA alkaline (supplied)

Battery monitor

Battery OK when LED illuminated

Battery life

Up to 100hrs use, dependent on use pattern



84 x 27 x 140mm (meter only)


150g excluding batteries

Operating environment

-10 to +45°C

10 to 85% RH

Ashton Audio in conjunction with Ampetronic can design your induction loop system for you.  Simple induction loop designs are free, complex array systems will be charged for at a nominal rate.  You can request a design through our 'Contact Us' Enquiry Form.


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