The FSM Magnetic Field Strength Meter from Ampetronic is a cost effective and simple solution for measuring, setting up and commissioning an induction loop system to the requirements of IEC60118-4. 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 and with 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.
Set of cables to easily interface audio inputs to loop systems (order code SCC)
Product Code:
TFSM01
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 broad band measurement to measure field strength delivered by the system.
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.
| 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 |
| Display | 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 |
| Battery | 2 x AA alkaline (supplied) |
| Battery monitor | Battery OK when LED illuminated |
| Battery life | Up to 100hrs use, dependent on use pattern |
| Dimension | 84 x 27 x 140mm (meter only) |
| Weight | 150g excluding batteries |
| Operating environment | -10 to +45°C |
| 10 to 85% RH |
Angers, France
Seattle, Washington, USA
Chelmsford, UK
